style: Switch to nixfmt from nixpkgs-fmt

Most of the ecosystem has moved to this formatter,
and many people configured their editors to autoformat it with this formatter.

Closes: https://git.snix.dev/snix/snix/issues/62
Change-Id: Icf39e7836c91fc2ae49fbe22a40a639105bfb0bd
Reviewed-on: https://cl.snix.dev/c/snix/+/30671
Reviewed-by: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>

.nixery/default.nix

@@ -1,6 +1,11 @@
 # See README.md
-{ depot ? import ../. { }, ... }:
+{
+  depot ? import ../. { },
+  ...
+}:
 
-depot.third_party.nixpkgs.extend (_: _: {
-  tvl = depot;
-})
+depot.third_party.nixpkgs.extend (
+  _: _: {
+    tvl = depot;
+  }
+)

contrib/archivist/default.nix

@@ -1,6 +1,7 @@
-{ depot
-, pkgs
-, ...
+{
+  depot,
+  pkgs,
+  ...
 }:
 
 let
@@ -13,27 +14,33 @@ let
   '';
   # clickhouse has a very odd AWS config concept.
   # Configure it to be a bit more sane.
-  clickhouseLocalFixedAWS = pkgs.runCommand "clickhouse-local-fixed"
-    {
-      nativeBuildInputs = [ pkgs.makeWrapper ];
-    } ''
-    mkdir -p $out/bin
-    makeWrapper ${pkgs.clickhouse}/bin/clickhouse-local $out/bin/clickhouse-local \
-      --append-flags "-C ${clickhouseConfigAWS}"
-  '';
+  clickhouseLocalFixedAWS =
+    pkgs.runCommand "clickhouse-local-fixed"
+      {
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+      }
+      ''
+        mkdir -p $out/bin
+        makeWrapper ${pkgs.clickhouse}/bin/clickhouse-local $out/bin/clickhouse-local \
+          --append-flags "-C ${clickhouseConfigAWS}"
+      '';
 
 in
 depot.nix.readTree.drvTargets {
   inherit clickhouseLocalFixedAWS;
 
-  parse-bucket-logs = pkgs.runCommand "archivist-parse-bucket-logs"
-    {
-      nativeBuildInputs = [ pkgs.makeWrapper ];
-    } ''
-    mkdir -p $out/bin
-    makeWrapper ${(pkgs.writers.writeRust "parse-bucket-logs-unwrapped" {} ./parse_bucket_logs.rs)} $out/bin/archivist-parse-bucket-logs \
-      --prefix PATH : ${pkgs.lib.makeBinPath [ clickhouseLocalFixedAWS ]}
-  '';
+  parse-bucket-logs =
+    pkgs.runCommand "archivist-parse-bucket-logs"
+      {
+        nativeBuildInputs = [ pkgs.makeWrapper ];
+      }
+      ''
+        mkdir -p $out/bin
+        makeWrapper ${
+          (pkgs.writers.writeRust "parse-bucket-logs-unwrapped" { } ./parse_bucket_logs.rs)
+        } $out/bin/archivist-parse-bucket-logs \
+          --prefix PATH : ${pkgs.lib.makeBinPath [ clickhouseLocalFixedAWS ]}
+      '';
 
   # A shell, by default pointing us to the archivist SSO profile / account by default.
   shell = pkgs.mkShell {

contrib/crunch-v2/default.nix

@@ -1,4 +1,9 @@
-{ pkgs, depot, lib, ... }:
+{
+  pkgs,
+  depot,
+  lib,
+  ...
+}:
 
 (pkgs.callPackage ./Cargo.nix {
   defaultCrateOverrides = (depot.snix.utils.defaultCrateOverridesForPkgs pkgs) // {
@@ -10,6 +15,7 @@
       nativeBuildInputs = [ pkgs.protobuf ];
     };
   };
-}).rootCrate.build.overrideAttrs {
-  meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-}
+}).rootCrate.build.overrideAttrs
+  {
+    meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  }

contrib/fetchroots/default.nix

@@ -6,6 +6,7 @@
       src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
     };
   };
-}).rootCrate.build.overrideAttrs {
-  meta.ci.extraSteps.crate2nix = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-}
+}).rootCrate.build.overrideAttrs
+  {
+    meta.ci.extraSteps.crate2nix = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  }

contrib/narinfo2parquet/default.nix

@@ -6,6 +6,7 @@
       src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
     };
   };
-}).rootCrate.build.overrideAttrs {
-  meta.ci.extraSteps.crate2nix = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-}
+}).rootCrate.build.overrideAttrs
+  {
+    meta.ci.extraSteps.crate2nix = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  }

contrib/snixbolt/default.nix

@@ -1,4 +1,9 @@
-{ pkgs, lib, depot, ... }:
+{
+  pkgs,
+  lib,
+  depot,
+  ...
+}:
 let
   pkgsCross = pkgs.pkgsCross.wasm32-unknown-none;
 in
@@ -8,25 +13,26 @@ in
       src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
     };
   };
-}).rootCrate.build.overrideAttrs (oldAttrs: {
-  installPhase = ''
-    ${lib.getExe pkgs.wasm-bindgen-cli} \
-      --target web \
-      --out-dir $out \
-      --out-name ${oldAttrs.crateName} \
-      --no-typescript \
-      target/lib/${oldAttrs.crateName}-${oldAttrs.metadata}.wasm
+}).rootCrate.build.overrideAttrs
+  (oldAttrs: {
+    installPhase = ''
+      ${lib.getExe pkgs.wasm-bindgen-cli} \
+        --target web \
+        --out-dir $out \
+        --out-name ${oldAttrs.crateName} \
+        --no-typescript \
+        target/lib/${oldAttrs.crateName}-${oldAttrs.metadata}.wasm
 
-      mv src/*.{html,css} $out
-  '';
+        mv src/*.{html,css} $out
+    '';
 
-  passthru.serve = pkgs.writeShellScriptBin "snixbolt-serve" ''
-    ${lib.getExe pkgs.simple-http-server} \
-        --index \
-        --nocache \
-        "$@" \
-        ${depot.contrib.snixbolt}
-  '';
+    passthru.serve = pkgs.writeShellScriptBin "snixbolt-serve" ''
+      ${lib.getExe pkgs.simple-http-server} \
+          --index \
+          --nocache \
+          "$@" \
+          ${depot.contrib.snixbolt}
+    '';
 
-  meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-})
+    meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  })

contrib/turbofetch/default.nix

@@ -6,6 +6,7 @@
       src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
     };
   };
-}).rootCrate.build.overrideAttrs {
-  meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-}
+}).rootCrate.build.overrideAttrs
+  {
+    meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  }

contrib/weave/default.nix

@@ -6,6 +6,7 @@
       src = depot.snix.utils.filterRustCrateSrc { root = prev.src.origSrc; };
     };
   };
-}).rootCrate.build.overrideAttrs {
-  meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
-}
+}).rootCrate.build.overrideAttrs
+  {
+    meta.ci.extraSteps.crate2nix-check = depot.snix.utils.mkCrate2nixCheck ./Cargo.nix;
+  }

default.nix

@@ -2,28 +2,31 @@
 # (see //nix/readTree for details) and constructing a matching attribute set
 # tree.
 
-{ nixpkgsBisectPath ? null
-, parentTargetMap ? null
-, nixpkgsConfig ? { }
-, localSystem ? builtins.currentSystem
-, crossSystem ? null
-, ...
+{
+  nixpkgsBisectPath ? null,
+  parentTargetMap ? null,
+  nixpkgsConfig ? { },
+  localSystem ? builtins.currentSystem,
+  crossSystem ? null,
+  ...
 }@args:
 
 let
   readTree = import ./nix/readTree { };
 
-  readDepot = depotArgs: readTree {
-    args = depotArgs;
-    path = ./.;
-    scopedArgs = {
-      # FIXME(Lix): this cannot work in Lix itself.
-      # __findFile = _: _: throw "Do not import from NIX_PATH in the depot!";
-      builtins = builtins // {
-        currentSystem = throw "Use localSystem from the readTree args instead of builtins.currentSystem!";
+  readDepot =
+    depotArgs:
+    readTree {
+      args = depotArgs;
+      path = ./.;
+      scopedArgs = {
+        # FIXME(Lix): this cannot work in Lix itself.
+        # __findFile = _: _: throw "Do not import from NIX_PATH in the depot!";
+        builtins = builtins // {
+          currentSystem = throw "Use localSystem from the readTree args instead of builtins.currentSystem!";
+        };
       };
     };
-  };
 
   # To determine build targets, we walk through the depot tree and
   # fetch attributes that were imported by readTree and are buildable.
@@ -34,54 +37,66 @@ let
   eligible = node: (node ? outPath) && !(node.meta.ci.skip or (node.meta.broken or false));
 
 in
-readTree.fix (self: (readDepot {
-  inherit localSystem crossSystem;
-  depot = self;
+readTree.fix (
+  self:
+  (readDepot {
+    inherit localSystem crossSystem;
+    depot = self;
 
-  # Pass third_party as 'pkgs' (for compatibility with external
-  # imports for certain subdirectories)
-  pkgs = self.third_party.nixpkgs;
+    # Pass third_party as 'pkgs' (for compatibility with external
+    # imports for certain subdirectories)
+    pkgs = self.third_party.nixpkgs;
 
-  # Expose lib attribute to packages.
-  lib = self.third_party.nixpkgs.lib;
+    # Expose lib attribute to packages.
+    lib = self.third_party.nixpkgs.lib;
 
-  # Pass arguments passed to the entire depot through, for packages
-  # that would like to add functionality based on this.
-  #
-  # Note that it is intended for exceptional circumstance, such as
-  # debugging by bisecting nixpkgs.
-  externalArgs = args;
-}) // {
-  # Make the path to the depot available for things that might need it
-  # (e.g. NixOS module inclusions)
-  path = self.third_party.nixpkgs.lib.cleanSourceWith {
-    name = "depot";
-    src = ./.;
-    filter = self.third_party.nixpkgs.lib.cleanSourceFilter;
-  };
+    # Pass arguments passed to the entire depot through, for packages
+    # that would like to add functionality based on this.
+    #
+    # Note that it is intended for exceptional circumstance, such as
+    # debugging by bisecting nixpkgs.
+    externalArgs = args;
+  })
+  // {
+    # Make the path to the depot available for things that might need it
+    # (e.g. NixOS module inclusions)
+    path = self.third_party.nixpkgs.lib.cleanSourceWith {
+      name = "depot";
+      src = ./.;
+      filter = self.third_party.nixpkgs.lib.cleanSourceFilter;
+    };
 
-  # Additionally targets can be excluded from CI by adding them to the
-  # list below.
-  ci.excluded = [
-  ];
+    # Additionally targets can be excluded from CI by adding them to the
+    # list below.
+    ci.excluded = [
+    ];
 
-  # List of all buildable targets, for CI purposes.
-  #
-  # Note: To prevent infinite recursion, this *must* be a nested
-  # attribute set (which does not have a __readTree attribute).
-  ci.targets = readTree.gather
-    (t: (eligible t) && (!builtins.elem t self.ci.excluded))
-    (self // {
-      # remove the pipelines themselves from the set over which to
-      # generate pipelines because that also leads to infinite
-      # recursion.
-      ops = self.ops // { pipelines = null; };
-    });
+    # List of all buildable targets, for CI purposes.
+    #
+    # Note: To prevent infinite recursion, this *must* be a nested
+    # attribute set (which does not have a __readTree attribute).
+    ci.targets = readTree.gather (t: (eligible t) && (!builtins.elem t self.ci.excluded)) (
+      self
+      // {
+        # remove the pipelines themselves from the set over which to
+        # generate pipelines because that also leads to infinite
+        # recursion.
+        ops = self.ops // {
+          pipelines = null;
+        };
+      }
+    );
 
-  # Derivation that gcroots all depot targets.
-  ci.gcroot = with self.third_party.nixpkgs; writeText "depot-gcroot"
-    (builtins.concatStringsSep "\n"
-      (lib.flatten
-        (map (p: map (o: p.${o}) p.outputs or [ ]) # list all outputs of each drv
-          self.ci.targets)));
-})
+    # Derivation that gcroots all depot targets.
+    ci.gcroot =
+      with self.third_party.nixpkgs;
+      writeText "depot-gcroot" (
+        builtins.concatStringsSep "\n" (
+          lib.flatten (
+            map (p: map (o: p.${o}) p.outputs or [ ]) # list all outputs of each drv
+              self.ci.targets
+          )
+        )
+      );
+  }
+)

fun/solves-this/default.nix

@@ -1,10 +1,12 @@
 { pkgs, ... }:
 let
-  mkWebroot = title: imgsrc: pkgs.runCommand "webroot" { } ''
-    mkdir -p $out
-    title="${title}" substituteAll ${./index.html} $out/index.html
-    cp ${imgsrc} $out/solves-this.png
-  '';
+  mkWebroot =
+    title: imgsrc:
+    pkgs.runCommand "webroot" { } ''
+      mkdir -p $out
+      title="${title}" substituteAll ${./index.html} $out/index.html
+      cp ${imgsrc} $out/solves-this.png
+    '';
 
 in
 {

nix/bufCheck/default.nix

@@ -1,9 +1,14 @@
 # Check protobuf breaking. Lints already happen in individual targets.
 #
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 let
-  inherit (depot.nix) bufCheck;# self reference
+  inherit (depot.nix) bufCheck; # self reference
 
   script = pkgs.writeShellScriptBin "ci-buf-check" ''
     export PATH="$PATH:${pkgs.lib.makeBinPath [ pkgs.buf ]}"

nix/buildBazelPackageNG/bazelRulesJavaHook/default.nix

@@ -1,7 +1,6 @@
 { makeSetupHook }:
 
-makeSetupHook
-{
+makeSetupHook {
   name = "rules_java_bazel_hook";
   substitutions = {
     local_java = ./local_java;

nix/buildBazelPackageNG/bazelRulesNodeJS5Hook/default.nix

@@ -1,13 +1,14 @@
-{ stdenvNoCC
-, lib
-, makeSetupHook
-, fetchFromGitHub
-, coreutils
-, gnugrep
-, nodejs
-, yarn
-, git
-, cacert
+{
+  stdenvNoCC,
+  lib,
+  makeSetupHook,
+  fetchFromGitHub,
+  coreutils,
+  gnugrep,
+  nodejs,
+  yarn,
+  git,
+  cacert,
 }:
 let
   rulesNodeJS = stdenvNoCC.mkDerivation rec {
@@ -30,7 +31,12 @@ let
           --replace-quiet '#!/usr/bin/env bash' '#!${stdenvNoCC.shell}' \
           --replace-quiet '#!/bin/bash' '#!${stdenvNoCC.shell}'
       done
-      sed -i '/^#!/a export PATH=${lib.makeBinPath [ coreutils gnugrep ]}:$PATH' internal/node/launcher.sh
+      sed -i '/^#!/a export PATH=${
+        lib.makeBinPath [
+          coreutils
+          gnugrep
+        ]
+      }:$PATH' internal/node/launcher.sh
     '';
 
     installPhase = ''
@@ -38,8 +44,7 @@ let
     '';
   };
 in
-makeSetupHook
-{
+makeSetupHook {
   name = "bazelbuild-rules_nodejs-5-hook";
   propagatedBuildInputs = [
     nodejs
@@ -48,7 +53,12 @@ makeSetupHook
     cacert
   ];
   substitutions = {
-    inherit nodejs yarn cacert rulesNodeJS;
+    inherit
+      nodejs
+      yarn
+      cacert
+      rulesNodeJS
+      ;
     local_node = ./local_node;
     local_yarn = ./local_yarn;
   };

nix/buildBazelPackageNG/buildBazelPackageNG.nix

@@ -1,17 +1,19 @@
-{ stdenv
-, lib
-, pkgs
-, coreutils
+{
+  stdenv,
+  lib,
+  pkgs,
+  coreutils,
 }:
 
-{ name ? "${baseAttrs.pname}-${baseAttrs.version}"
-, bazelTargets
-, bazel ? pkgs.bazel
-, depsHash
-, extraCacheInstall ? ""
-, extraBuildSetup ? ""
-, extraBuildInstall ? ""
-, ...
+{
+  name ? "${baseAttrs.pname}-${baseAttrs.version}",
+  bazelTargets,
+  bazel ? pkgs.bazel,
+  depsHash,
+  extraCacheInstall ? "",
+  extraBuildSetup ? "",
+  extraBuildInstall ? "",
+  ...
 }@baseAttrs:
 
 let
@@ -24,20 +26,23 @@ let
   ];
   attrs = cleanAttrs baseAttrs;
 
-  base = stdenv.mkDerivation (attrs // {
-    nativeBuildInputs = (attrs.nativeBuildInputs or [ ]) ++ [
-      bazel
-    ];
+  base = stdenv.mkDerivation (
+    attrs
+    // {
+      nativeBuildInputs = (attrs.nativeBuildInputs or [ ]) ++ [
+        bazel
+      ];
 
-    preUnpack = ''
-      if [[ ! -d $HOME ]]; then
-        export HOME=$NIX_BUILD_TOP/home
-        mkdir -p $HOME
-      fi
-    '';
+      preUnpack = ''
+        if [[ ! -d $HOME ]]; then
+          export HOME=$NIX_BUILD_TOP/home
+          mkdir -p $HOME
+        fi
+      '';
 
-    bazelTargetNames = builtins.attrNames bazelTargets;
-  });
+      bazelTargetNames = builtins.attrNames bazelTargets;
+    }
+  );
 
   cache = base.overrideAttrs (base: {
     name = "${name}-deps";
@@ -89,18 +94,23 @@ let
     installPhase = ''
       runHook preInstall
 
-      ${builtins.concatStringsSep "\n" (lib.mapAttrsToList (target: outPath: lib.optionalString (outPath != null) ''
-        TARGET_OUTPUTS="$(bazel cquery --repository_cache=$cache/repository-cache $bazelFlags "''${bazelFlagsArray[@]}" --output=files "${target}")"
-        if [[ "$(echo "$TARGET_OUTPUTS" | wc -l)" -gt 1 ]]; then
-          echo "Installing ${target}'s outputs ($TARGET_OUTPUTS) into ${outPath} as a directory"
-          mkdir -p "${outPath}"
-          cp $TARGET_OUTPUTS "${outPath}"
-        else
-          echo "Installing ${target}'s output ($TARGET_OUTPUTS) to ${outPath}"
-          mkdir -p "${dirOf outPath}"
-          cp "$TARGET_OUTPUTS" "${outPath}"
-        fi
-      '') bazelTargets)}
+      ${builtins.concatStringsSep "\n" (
+        lib.mapAttrsToList (
+          target: outPath:
+          lib.optionalString (outPath != null) ''
+            TARGET_OUTPUTS="$(bazel cquery --repository_cache=$cache/repository-cache $bazelFlags "''${bazelFlagsArray[@]}" --output=files "${target}")"
+            if [[ "$(echo "$TARGET_OUTPUTS" | wc -l)" -gt 1 ]]; then
+              echo "Installing ${target}'s outputs ($TARGET_OUTPUTS) into ${outPath} as a directory"
+              mkdir -p "${outPath}"
+              cp $TARGET_OUTPUTS "${outPath}"
+            else
+              echo "Installing ${target}'s output ($TARGET_OUTPUTS) to ${outPath}"
+              mkdir -p "${dirOf outPath}"
+              cp "$TARGET_OUTPUTS" "${outPath}"
+            fi
+          ''
+        ) bazelTargets
+      )}
       ${extraBuildInstall}
 
       runHook postInstall

nix/buildBazelPackageNG/default.nix

@@ -1,6 +1,7 @@
 { pkgs, ... }:
 
-(pkgs.callPackage ./buildBazelPackageNG.nix { }) // {
+(pkgs.callPackage ./buildBazelPackageNG.nix { })
+// {
   bazelRulesJavaHook = pkgs.callPackage ./bazelRulesJavaHook { };
   bazelRulesNodeJS5Hook = pkgs.callPackage ./bazelRulesNodeJS5Hook { };
 }

nix/buildkite/default.nix

@@ -22,7 +22,8 @@ let
     listToAttrs
     mapAttrs
     toJSON
-    unsafeDiscardStringContext;
+    unsafeDiscardStringContext
+    ;
 
   inherit (pkgs) lib runCommand writeText;
   inherit (depot.nix.readTree) mkLabel;
@@ -33,24 +34,27 @@ rec {
   # Create a unique key for the buildkite pipeline based on the given derivation
   # or drvPath. A consequence of using such keys is that every derivation may
   # only be exposed as a single, unique step in the pipeline.
-  keyForDrv = drvOrPath:
+  keyForDrv =
+    drvOrPath:
     let
       drvPath =
-        if lib.isDerivation drvOrPath then drvOrPath.drvPath
-        else if lib.isString drvOrPath then drvOrPath
-        else builtins.throw "keyForDrv: expected string or derivation";
+        if lib.isDerivation drvOrPath then
+          drvOrPath.drvPath
+        else if lib.isString drvOrPath then
+          drvOrPath
+        else
+          builtins.throw "keyForDrv: expected string or derivation";
 
       # Only use the drv hash to prevent escaping problems. Buildkite also has a
       # limit of 100 characters on keys.
     in
-    "drv-" + (builtins.substring 0 32
-      (builtins.baseNameOf (unsafeDiscardStringContext drvPath))
-    );
+    "drv-" + (builtins.substring 0 32 (builtins.baseNameOf (unsafeDiscardStringContext drvPath)));
 
   # Given an arbitrary attribute path generate a Nix expression which obtains
   # this from the root of depot (assumed to be ./.). Attributes may be any
   # Nix strings suitable as attribute names, not just Nix literal-safe strings.
-  mkBuildExpr = attrPath:
+  mkBuildExpr =
+    attrPath:
     let
       descend = expr: attr: "builtins.getAttr \"${attr}\" (${expr})";
     in
@@ -58,38 +62,49 @@ rec {
 
   # Determine whether to skip a target if it has not diverged from the
   # HEAD branch.
-  shouldSkip = { parentTargetMap ? { }, label, drvPath }:
-    if (hasAttr label parentTargetMap) && parentTargetMap."${label}".drvPath == drvPath
-    then "Target has not changed."
-    else false;
+  shouldSkip =
+    {
+      parentTargetMap ? { },
+      label,
+      drvPath,
+    }:
+    if (hasAttr label parentTargetMap) && parentTargetMap."${label}".drvPath == drvPath then
+      "Target has not changed."
+    else
+      false;
 
   # Create build command for an attribute path pointing to a derivation.
-  mkBuildCommand = { attrPath, drvPath, outLink ? "result" }: concatStringsSep " " [
-    # If the nix build fails, the Nix command's exit status should be used.
-    "set -o pipefail;"
+  mkBuildCommand =
+    {
+      attrPath,
+      drvPath,
+      outLink ? "result",
+    }:
+    concatStringsSep " " [
+      # If the nix build fails, the Nix command's exit status should be used.
+      "set -o pipefail;"
 
-    # First try to realise the drvPath of the target so we don't evaluate twice.
-    # Nix has no concept of depending on a derivation file without depending on
-    # at least one of its `outPath`s, so we need to discard the string context
-    # if we don't want to build everything during pipeline construction.
-    #
-    # To make this more uniform with how nix-build(1) works, we call realpath(1)
-    # on nix-store(1)'s output since it has the habit of printing the path of the
-    # out link, not the store path.
-    "(nix-store --realise '${drvPath}' --add-root '${outLink}' --indirect | xargs -r realpath)"
+      # First try to realise the drvPath of the target so we don't evaluate twice.
+      # Nix has no concept of depending on a derivation file without depending on
+      # at least one of its `outPath`s, so we need to discard the string context
+      # if we don't want to build everything during pipeline construction.
+      #
+      # To make this more uniform with how nix-build(1) works, we call realpath(1)
+      # on nix-store(1)'s output since it has the habit of printing the path of the
+      # out link, not the store path.
+      "(nix-store --realise '${drvPath}' --add-root '${outLink}' --indirect | xargs -r realpath)"
 
-    # Since we don't gcroot the derivation files, they may be deleted by the
-    # garbage collector. In that case we can reevaluate and build the attribute
-    # using nix-build.
-    "|| (test ! -f '${drvPath}' && nix-build -E '${mkBuildExpr attrPath}' --show-trace --out-link '${outLink}')"
-  ];
+      # Since we don't gcroot the derivation files, they may be deleted by the
+      # garbage collector. In that case we can reevaluate and build the attribute
+      # using nix-build.
+      "|| (test ! -f '${drvPath}' && nix-build -E '${mkBuildExpr attrPath}' --show-trace --out-link '${outLink}')"
+    ];
 
   # Attribute path of a target relative to the depot root. Needs to take into
   # account whether the target is a physical target (which corresponds to a path
   # in the filesystem) or the subtarget of a physical target.
-  targetAttrPath = target:
-    target.__readTree
-    ++ lib.optionals (target ? __subtarget) [ target.__subtarget ];
+  targetAttrPath =
+    target: target.__readTree ++ lib.optionals (target ? __subtarget) [ target.__subtarget ];
 
   # Given a derivation (identified by drvPath) that is part of the list of
   # targets passed to mkPipeline, determine all derivations that it depends on
@@ -97,11 +112,18 @@ rec {
   # that build them. This is used to populate `depends_on` in `mkStep`.
   #
   # See //nix/dependency-analyzer for documentation on the structure of `targetDepMap`.
-  getTargetPipelineDeps = targetDepMap: drvPath:
-    builtins.map keyForDrv (targetDepMap.${drvPath}.knownDeps or [ ]);
+  getTargetPipelineDeps =
+    targetDepMap: drvPath: builtins.map keyForDrv (targetDepMap.${drvPath}.knownDeps or [ ]);
 
   # Create a pipeline step from a single target.
-  mkStep = { headBranch, parentTargetMap, targetDepMap, target, cancelOnBuildFailing }:
+  mkStep =
+    {
+      headBranch,
+      parentTargetMap,
+      targetDepMap,
+      target,
+      cancelOnBuildFailing,
+    }:
     let
       label = mkLabel target;
       drvPath = unsafeDiscardStringContext target.drvPath;
@@ -120,24 +142,34 @@ rec {
       # Add a dependency on the initial static pipeline step which
       # always runs. This allows build steps uploaded in batches to
       # start running before all batches have been uploaded.
-      depends_on = [ ":init:" ]
+      depends_on = [
+        ":init:"
+      ]
       ++ getTargetPipelineDeps targetDepMap drvPath
       ++ lib.optionals (target ? meta.ci.buildkiteExtraDeps) target.meta.ci.buildkiteExtraDeps;
-    } // lib.optionalAttrs (target ? meta.timeout) {
+    }
+    // lib.optionalAttrs (target ? meta.timeout) {
       timeout_in_minutes = target.meta.timeout / 60;
       # Additional arguments to set on the step.
       # Keep in mind these *overwrite* existing step args, not extend. Use with caution.
-    } // lib.optionalAttrs (target ? meta.ci.buildkiteExtraStepArgs) target.meta.ci.buildkiteExtraStepArgs;
+    }
+    // lib.optionalAttrs (
+      target ? meta.ci.buildkiteExtraStepArgs
+    ) target.meta.ci.buildkiteExtraStepArgs;
 
   # Helper function to inelegantly divide a list into chunks of at
   # most n elements.
   #
   # This works by assigning each element a chunk ID based on its
   # index, and then grouping all elements by their chunk ID.
-  chunksOf = n: list:
+  chunksOf =
+    n: list:
     let
       chunkId = idx: toString (idx / n + 1);
-      assigned = lib.imap1 (idx: value: { inherit value; chunk = chunkId idx; }) list;
+      assigned = lib.imap1 (idx: value: {
+        inherit value;
+        chunk = chunkId idx;
+      }) list;
       unchunk = mapAttrs (_: elements: map (e: e.value) elements);
     in
     unchunk (lib.groupBy (e: e.chunk) assigned);
@@ -156,36 +188,35 @@ rec {
   # are uploaded sequentially. This is because of a limitation in the
   # Buildkite backend which struggles to process more than a specific
   # number of chunks at once.
-  pipelineChunks = name: steps:
-    attrValues (mapAttrs (makePipelineChunk name) (chunksOf 192 steps));
+  pipelineChunks = name: steps: attrValues (mapAttrs (makePipelineChunk name) (chunksOf 192 steps));
 
   # Create a pipeline structure for the given targets.
   mkPipeline =
     {
       # HEAD branch of the repository on which release steps, GC
       # anchoring and other "mainline only" steps should run.
-      headBranch
-    , # List of derivations as read by readTree (in most cases just the
+      headBranch,
+      # List of derivations as read by readTree (in most cases just the
       # output of readTree.gather) that should be built in Buildkite.
       #
       # These are scheduled as the first build steps and run as fast as
       # possible, in order, without any concurrency restrictions.
-      drvTargets
-    , # Derivation map of a parent commit. Only targets which no longer
+      drvTargets,
+      # Derivation map of a parent commit. Only targets which no longer
       # correspond to the content of this map will be built. Passing an
       # empty map will always build all targets.
-      parentTargetMap ? { }
-    , # A list of plain Buildkite step structures to run alongside the
+      parentTargetMap ? { },
+      # A list of plain Buildkite step structures to run alongside the
       # build for all drvTargets, but before proceeding with any
       # post-build actions such as status reporting.
       #
       # Can be used for things like code formatting checks.
-      additionalSteps ? [ ]
-    , # A list of plain Buildkite step structures to run after all
+      additionalSteps ? [ ],
+      # A list of plain Buildkite step structures to run after all
       # previous steps succeeded.
       #
       # Can be used for status reporting steps and the like.
-      postBuildSteps ? [ ]
+      postBuildSteps ? [ ],
       # The list of phases known by the current Buildkite
       # pipeline. Dynamic pipeline chunks for each phase are uploaded
       # to Buildkite on execution of static part of the
@@ -199,7 +230,10 @@ rec {
       #   - "build" - main phase for building all Nix targets
       #   - "release" - pushing artifacts to external repositories
       #   - "deploy" - updating external deployment configurations
-    , phases ? [ "build" "release" ]
+      phases ? [
+        "build"
+        "release"
+      ],
       # Build phases that are active for this invocation (i.e. their
       # steps should be generated).
       #
@@ -208,13 +242,13 @@ rec {
       # eval contexts.
       #
       # TODO(tazjin): Fail/warn if unknown phase is requested.
-    , activePhases ? phases
+      activePhases ? phases,
       # Setting this attribute to true cancels dynamic pipeline steps
       # as soon as the build is marked as failing.
       #
       # To enable this feature one should enable "Fail Fast" setting
       # at Buildkite pipeline or on organization level.
-    , cancelOnBuildFailing ? false
+      cancelOnBuildFailing ? false,
     }:
     let
       # List of phases to include.
@@ -232,20 +266,25 @@ rec {
           # the previous pipeline (per parentTargetMap). Unchanged targets will
           # be skipped (assumed already built), so it's useless to emit deps
           # on their steps.
-          changedDrvTargets = builtins.filter
-            (target:
-              parentTargetMap.${mkLabel target}.drvPath or null != target.drvPath
-            )
-            drvTargets;
+          changedDrvTargets = builtins.filter (
+            target: parentTargetMap.${mkLabel target}.drvPath or null != target.drvPath
+          ) drvTargets;
         in
         dependency-analyzer (dependency-analyzer.drvsToPaths changedDrvTargets);
 
       # Convert a target into all of its steps, separated by build
       # phase (as phases end up in different chunks).
-      targetToSteps = target:
+      targetToSteps =
+        target:
         let
           mkStepArgs = {
-            inherit headBranch parentTargetMap targetDepMap target cancelOnBuildFailing;
+            inherit
+              headBranch
+              parentTargetMap
+              targetDepMap
+              target
+              cancelOnBuildFailing
+              ;
           };
           step = mkStep mkStepArgs;
 
@@ -257,19 +296,21 @@ rec {
           overridable = f: mkStep (mkStepArgs // { target = (f target); });
 
           # Split extra steps by phase.
-          splitExtraSteps = lib.groupBy ({ phase, ... }: phase)
-            (attrValues (mapAttrs (normaliseExtraStep phases overridable)
-              (target.meta.ci.extraSteps or { })));
+          splitExtraSteps = lib.groupBy ({ phase, ... }: phase) (
+            attrValues (mapAttrs (normaliseExtraStep phases overridable) (target.meta.ci.extraSteps or { }))
+          );
 
-          extraSteps = mapAttrs
-            (_: steps:
-              map (mkExtraStep (targetAttrPath target) buildEnabled) steps)
-            splitExtraSteps;
+          extraSteps = mapAttrs (
+            _: steps: map (mkExtraStep (targetAttrPath target) buildEnabled) steps
+          ) splitExtraSteps;
         in
-        if !buildEnabled then extraSteps
-        else extraSteps // {
-          build = [ step ] ++ (extraSteps.build or [ ]);
-        };
+        if !buildEnabled then
+          extraSteps
+        else
+          extraSteps
+          // {
+            build = [ step ] ++ (extraSteps.build or [ ]);
+          };
 
       # Combine all target steps into step lists per phase.
       #
@@ -279,44 +320,47 @@ rec {
         release = postBuildSteps;
       };
 
-      phasesWithSteps = lib.zipAttrsWithNames enabledPhases (_: concatLists)
-        ((map targetToSteps drvTargets) ++ [ globalSteps ]);
+      phasesWithSteps = lib.zipAttrsWithNames enabledPhases (_: concatLists) (
+        (map targetToSteps drvTargets) ++ [ globalSteps ]
+      );
 
       # Generate pipeline chunks for each phase.
-      chunks = foldl'
-        (acc: phase:
-          let phaseSteps = phasesWithSteps.${phase} or [ ]; in
-          if phaseSteps == [ ]
-          then acc
-          else acc ++ (pipelineChunks phase phaseSteps))
-        [ ]
-        enabledPhases;
+      chunks = foldl' (
+        acc: phase:
+        let
+          phaseSteps = phasesWithSteps.${phase} or [ ];
+        in
+        if phaseSteps == [ ] then acc else acc ++ (pipelineChunks phase phaseSteps)
+      ) [ ] enabledPhases;
 
     in
     runCommand "buildkite-pipeline" { } ''
       mkdir $out
       echo "Generated ${toString (length chunks)} pipeline chunks"
-      ${
-        lib.concatMapStringsSep "\n"
-          (chunk: "cp ${chunk.path} $out/${chunk.filename}") chunks
-      }
+      ${lib.concatMapStringsSep "\n" (chunk: "cp ${chunk.path} $out/${chunk.filename}") chunks}
     '';
 
   # Create a drvmap structure for the given targets, containing the
   # mapping of all target paths to their derivations. The mapping can
   # be persisted for future use.
-  mkDrvmap = drvTargets: writeText "drvmap.json" (toJSON (listToAttrs (map
-    (target: {
-      name = mkLabel target;
-      value = {
-        drvPath = unsafeDiscardStringContext target.drvPath;
+  mkDrvmap =
+    drvTargets:
+    writeText "drvmap.json" (
+      toJSON (
+        listToAttrs (
+          map (target: {
+            name = mkLabel target;
+            value = {
+              drvPath = unsafeDiscardStringContext target.drvPath;
 
-        # Include the attrPath in the output to reconstruct the drv
-        # without parsing the human-readable label.
-        attrPath = targetAttrPath target;
-      };
-    })
-    drvTargets)));
+              # Include the attrPath in the output to reconstruct the drv
+              # without parsing the human-readable label.
+              attrPath = targetAttrPath target;
+            };
+          }) drvTargets
+        )
+      )
+    );
 
   # Implementation of extra step logic.
   #
@@ -356,40 +400,49 @@ rec {
 
   # Create a gated step in a step group, independent from any other
   # steps.
-  mkGatedStep = { step, label, parent, prompt }: {
-    inherit (step) depends_on;
-    group = label;
-    skip = parent.skip or false;
+  mkGatedStep =
+    {
+      step,
+      label,
+      parent,
+      prompt,
+    }:
+    {
+      inherit (step) depends_on;
+      group = label;
+      skip = parent.skip or false;
 
-    steps = [
-      {
-        inherit prompt;
-        branches = step.branches or [ ];
-        block = ":radio_button: Run ${label}? (from ${parent.env.READTREE_TARGET})";
-      }
+      steps = [
+        {
+          inherit prompt;
+          branches = step.branches or [ ];
+          block = ":radio_button: Run ${label}? (from ${parent.env.READTREE_TARGET})";
+        }
 
-      # The explicit depends_on of the wrapped step must be removed,
-      # otherwise its dependency relationship with the gate step will
-      # break.
-      (builtins.removeAttrs step [ "depends_on" ])
-    ];
-  };
+        # The explicit depends_on of the wrapped step must be removed,
+        # otherwise its dependency relationship with the gate step will
+        # break.
+        (builtins.removeAttrs step [ "depends_on" ])
+      ];
+    };
 
   # Validate and normalise extra step configuration before actually
   # generating build steps, in order to use user-provided metadata
   # during the pipeline generation.
-  normaliseExtraStep = phases: overridableParent: key:
-    { command
-    , label ? key
-    , needsOutput ? false
-    , parentOverride ? (x: x)
-    , branches ? null
-    , alwaysRun ? false
-    , prompt ? false
-    , softFail ? false
-    , phase ? "build"
-    , skip ? false
-    , agents ? null
+  normaliseExtraStep =
+    phases: overridableParent: key:
+    {
+      command,
+      label ? key,
+      needsOutput ? false,
+      parentOverride ? (x: x),
+      branches ? null,
+      alwaysRun ? false,
+      prompt ? false,
+      softFail ? false,
+      phase ? "build",
+      skip ? false,
+      agents ? null,
     }:
     let
       parent = overridableParent parentOverride;
@@ -401,8 +454,7 @@ rec {
         Phase '${phase}' is not valid.
 
         Known phases: ${concatStringsSep ", " phases}
-      ''
-        phase;
+      '' phase;
     in
     {
       inherit
@@ -416,7 +468,8 @@ rec {
         parentLabel
         softFail
         skip
-        agents;
+        agents
+        ;
 
       phase = validPhase;
 
@@ -426,13 +479,13 @@ rec {
         The 'prompt' feature can not be used by steps in the "build"
         phase, because CI builds should not be gated on manual human
         approvals.
-      ''
-        prompt;
+      '' prompt;
     };
 
   # Create the Buildkite configuration for an extra step, optionally
   # wrapping it in a gate group.
-  mkExtraStep = parentAttrPath: buildEnabled: cfg:
+  mkExtraStep =
+    parentAttrPath: buildEnabled: cfg:
     let
       # ATTN: needs to match an entry in .gitignore so that the tree won't get dirty
       commandScriptLink = "nix-buildkite-extra-step-command-script";
@@ -453,15 +506,11 @@ rec {
           in
           if cfg.alwaysRun then false else skip';
 
-        depends_on = lib.optional
-          (buildEnabled && !cfg.alwaysRun && !cfg.needsOutput)
-          cfg.parent.key;
+        depends_on = lib.optional (buildEnabled && !cfg.alwaysRun && !cfg.needsOutput) cfg.parent.key;
 
         command = ''
           set -ueo pipefail
-          ${lib.optionalString cfg.needsOutput
-            "echo '~~~ Preparing build output of ${cfg.parentLabel}'"
-          }
+          ${lib.optionalString cfg.needsOutput "echo '~~~ Preparing build output of ${cfg.parentLabel}'"}
           ${lib.optionalString cfg.needsOutput cfg.parent.command}
           echo '--- Building extra step script'
           command_script="$(${
@@ -469,9 +518,13 @@ rec {
             assert builtins.length cfg.command.outputs == 1;
             mkBuildCommand {
               # script is exposed at <parent>.meta.ci.extraSteps.<key>.command
-              attrPath =
-                parentAttrPath
-                ++ [ "meta" "ci" "extraSteps" cfg.key "command" ];
+              attrPath = parentAttrPath ++ [
+                "meta"
+                "ci"
+                "extraSteps"
+                cfg.key
+                "command"
+              ];
               drvPath = unsafeDiscardStringContext cfg.command.drvPath;
               # make sure it doesn't conflict with result (from needsOutput)
               outLink = commandScriptLink;
@@ -483,17 +536,17 @@ rec {
         '';
 
         soft_fail = cfg.softFail;
-      } // (lib.optionalAttrs (cfg.agents != null) { inherit (cfg) agents; })
+      }
+      // (lib.optionalAttrs (cfg.agents != null) { inherit (cfg) agents; })
       // (lib.optionalAttrs (cfg.branches != null) {
         branches = lib.concatStringsSep " " cfg.branches;
       });
     in
-    if (isString cfg.prompt)
-    then
-      mkGatedStep
-        {
-          inherit step;
-          inherit (cfg) label parent prompt;
-        }
-    else step;
+    if (isString cfg.prompt) then
+      mkGatedStep {
+        inherit step;
+        inherit (cfg) label parent prompt;
+      }
+    else
+      step;
 }

nix/dependency-analyzer/default.nix

@@ -1,4 +1,9 @@
-{ lib, depot, pkgs, ... }:
+{
+  lib,
+  depot,
+  pkgs,
+  ...
+}:
 
 let
   inherit (builtins) unsafeDiscardStringContext appendContext;
@@ -18,23 +23,22 @@ let
   directDrvDeps =
     let
       getDeps =
-        if lib.versionAtLeast builtins.nixVersion "2.6"
-        then
-        # Since https://github.com/NixOS/nix/pull/1643, Nix apparently »preserves
-        # string context« through a readFile invocation. This has the side effect
-        # that it becomes possible to query the actual references a store path has.
-        # Not a 100% sure this is intended, but _very_ convenient for us here.
-          drvPath:
-          builtins.attrNames (builtins.getContext (builtins.readFile drvPath))
+        if lib.versionAtLeast builtins.nixVersion "2.6" then
+          # Since https://github.com/NixOS/nix/pull/1643, Nix apparently »preserves
+          # string context« through a readFile invocation. This has the side effect
+          # that it becomes possible to query the actual references a store path has.
+          # Not a 100% sure this is intended, but _very_ convenient for us here.
+          drvPath: builtins.attrNames (builtins.getContext (builtins.readFile drvPath))
         else
-        # For Nix < 2.6 we have to rely on HACK, namely grepping for quoted
-        # store path references in the file. In the future this should be
-        # replaced by a proper derivation parser.
-          drvPath: builtins.concatLists (
+          # For Nix < 2.6 we have to rely on HACK, namely grepping for quoted
+          # store path references in the file. In the future this should be
+          # replaced by a proper derivation parser.
+          drvPath:
+          builtins.concatLists (
             builtins.filter builtins.isList (
-              builtins.split
-                "\"(${lib.escapeRegex builtins.storeDir}/[[:alnum:]+._?=-]+.drv)\""
-                (builtins.readFile drvPath)
+              builtins.split "\"(${lib.escapeRegex builtins.storeDir}/[[:alnum:]+._?=-]+.drv)\"" (
+                builtins.readFile drvPath
+              )
             )
           );
     in
@@ -42,15 +46,12 @@ let
     # if the passed path is not a derivation we can't necessarily get its
     # dependencies, since it may not be representable as a Nix string due to
     # NUL bytes, e.g. compressed patch files imported into the Nix store.
-    if builtins.match "^.+\\.drv$" drvPath == null
-    then [ ]
-    else getDeps drvPath;
+    if builtins.match "^.+\\.drv$" drvPath == null then [ ] else getDeps drvPath;
 
   # Maps a list of derivation to the list of corresponding `drvPath`s.
   #
   # Type: [drv] -> [str]
-  drvsToPaths = drvs:
-    builtins.map (drv: builtins.unsafeDiscardOutputDependency drv.drvPath) drvs;
+  drvsToPaths = drvs: builtins.map (drv: builtins.unsafeDiscardOutputDependency drv.drvPath) drvs;
 
   #
   # Calculate map of direct derivation dependencies
@@ -62,7 +63,8 @@ let
   # generating the map from
   #
   # Type: bool -> string -> set
-  drvEntry = known: drvPath:
+  drvEntry =
+    known: drvPath:
     let
       # key may not refer to a store path, …
       key = unsafeDiscardStringContext drvPath;
@@ -85,7 +87,8 @@ let
   # attribute to `true` if it is in the list of input derivation paths.
   #
   # Type: [str] -> set
-  plainDrvDepMap = drvPaths:
+  plainDrvDepMap =
+    drvPaths:
     builtins.listToAttrs (
       builtins.genericClosure {
         startSet = builtins.map (drvEntry true) drvPaths;
@@ -121,13 +124,15 @@ let
   # `fmap (builtins.getAttr "knownDeps") (getAttr drvPath)` will always succeed.
   #
   # Type: str -> stateMonad drvDepMap null
-  insertKnownDeps = drvPathWithContext:
+  insertKnownDeps =
+    drvPathWithContext:
     let
       # We no longer need to read from the store, so context is irrelevant, but
       # we need to check for attr names which requires the absence of context.
       drvPath = unsafeDiscardStringContext drvPathWithContext;
     in
-    bind get (initDepMap:
+    bind get (
+      initDepMap:
       # Get the dependency map's state before we've done anything to obtain the
       # entry we'll be manipulating later as well as its dependencies.
       let
@@ -135,57 +140,48 @@ let
 
         # We don't need to recurse if our direct dependencies either have their
         # knownDeps list already populated or are known dependencies themselves.
-        depsPrecalculated =
-          builtins.partition
-            (dep:
-              initDepMap.${dep}.known
-              || initDepMap.${dep} ? knownDeps
-            )
-            entryPoint.deps;
+        depsPrecalculated = builtins.partition (
+          dep: initDepMap.${dep}.known || initDepMap.${dep} ? knownDeps
+        ) entryPoint.deps;
 
         # If a direct dependency is known, it goes right to our known dependency
         # list. If it is unknown, we can copy its knownDeps list into our own.
-        initiallyKnownDeps =
-          builtins.concatLists (
-            builtins.map
-              (dep:
-                if initDepMap.${dep}.known
-                then [ dep ]
-                else initDepMap.${dep}.knownDeps
-              )
-              depsPrecalculated.right
-          );
+        initiallyKnownDeps = builtins.concatLists (
+          builtins.map (
+            dep: if initDepMap.${dep}.known then [ dep ] else initDepMap.${dep}.knownDeps
+          ) depsPrecalculated.right
+        );
       in
 
       # If the information was already calculated before, we can exit right away
-      if entryPoint ? knownDeps
-      then pure null
+      if entryPoint ? knownDeps then
+        pure null
       else
         after
           # For all unknown direct dependencies which don't have a `knownDeps`
           # list, we call ourselves recursively to populate it. Since this is
           # done sequentially in the state monad, we avoid recalculating the
           # list for the same derivation multiple times.
-          (for_
-            depsPrecalculated.wrong
-            insertKnownDeps)
+          (for_ depsPrecalculated.wrong insertKnownDeps)
           # After this we can obtain the updated dependency map which will have
           # a `knownDeps` list for all our direct dependencies and update the
           # entry for the input `drvPath`.
-          (bind
-            get
-            (populatedDepMap:
-              (setAttr drvPath (entryPoint // {
-                knownDeps =
-                  lib.unique (
+          (
+            bind get (
+              populatedDepMap:
+              (setAttr drvPath (
+                entryPoint
+                // {
+                  knownDeps = lib.unique (
                     initiallyKnownDeps
-                      ++ builtins.concatLists (
-                      builtins.map
-                        (dep: populatedDepMap.${dep}.knownDeps)
-                        depsPrecalculated.wrong
+                    ++ builtins.concatLists (
+                      builtins.map (dep: populatedDepMap.${dep}.knownDeps) depsPrecalculated.wrong
                     )
                   );
-              }))))
+                }
+              ))
+            )
+          )
     );
 
   # This function puts it all together and is exposed via `__functor`.
@@ -204,14 +200,8 @@ let
   #         */
   #       ];
   #     }
-  knownDrvDepMap = knownDrvPaths:
-    run
-      (plainDrvDepMap knownDrvPaths)
-      (after
-        (for_
-          knownDrvPaths
-          insertKnownDeps)
-        get);
+  knownDrvDepMap =
+    knownDrvPaths: run (plainDrvDepMap knownDrvPaths) (after (for_ knownDrvPaths insertKnownDeps) get);
 
   #
   # Other things based on knownDrvDepMap
@@ -221,39 +211,39 @@ let
   # name, so multiple entries can be collapsed if they have the same name.
   #
   # Type: [drv] -> drv
-  knownDependencyGraph = name: drvs:
+  knownDependencyGraph =
+    name: drvs:
     let
-      justName = drvPath:
-        builtins.substring
-          (builtins.stringLength builtins.storeDir + 1 + 32 + 1)
-          (builtins.stringLength drvPath)
-          (unsafeDiscardStringContext drvPath);
+      justName =
+        drvPath:
+        builtins.substring (
+          builtins.stringLength builtins.storeDir + 1 + 32 + 1
+        ) (builtins.stringLength drvPath) (unsafeDiscardStringContext drvPath);
 
       gv = pkgs.writeText "${name}-dependency-analysis.gv" ''
         digraph depot {
         ${
-          (lib.concatStringsSep "\n"
-          (lib.mapAttrsToList (name: value:
-            if !value.known then ""
-            else lib.concatMapStringsSep "\n"
-              (knownDep: "  \"${justName name}\" -> \"${justName knownDep}\"")
-              value.knownDeps
-          )
-          (depot.nix.dependency-analyzer (
-            drvsToPaths drvs
-          ))))
+          (lib.concatStringsSep "\n" (
+            lib.mapAttrsToList (
+              name: value:
+              if !value.known then
+                ""
+              else
+                lib.concatMapStringsSep "\n" (
+                  knownDep: "  \"${justName name}\" -> \"${justName knownDep}\""
+                ) value.knownDeps
+            ) (depot.nix.dependency-analyzer (drvsToPaths drvs))
+          ))
         }
         }
       '';
     in
 
-    pkgs.runCommand "${name}-dependency-analysis.svg"
-      {
-        nativeBuildInputs = [
-          pkgs.buildPackages.graphviz
-        ];
-      }
-      "dot -Tsvg < ${gv} > $out";
+    pkgs.runCommand "${name}-dependency-analysis.svg" {
+      nativeBuildInputs = [
+        pkgs.buildPackages.graphviz
+      ];
+    } "dot -Tsvg < ${gv} > $out";
 in
 
 {

nix/escapeExecline/default.nix

@@ -4,8 +4,8 @@ let
   # e.g.
   #   a"b\c -> "a\"b\\c"
   #   a\"bc -> "a\\\"bc"
-  escapeExeclineArg = arg:
-    ''"${builtins.replaceStrings [ ''"'' ''\'' ] [ ''\"'' ''\\'' ] (toString arg)}"'';
+  escapeExeclineArg =
+    arg: ''"${builtins.replaceStrings [ ''"'' ''\'' ] [ ''\"'' ''\\'' ] (toString arg)}"'';
 
   # Escapes an execline (list of execline strings) to be passed to execlineb
   # Give it a nested list of strings. Nested lists are interpolated as execline
@@ -15,15 +15,24 @@ let
   # Example:
   #   escapeExecline [ "if" [ "somecommand" ] "true" ]
   #   == ''"if" { "somecommand" } "true"''
-  escapeExecline = execlineList: lib.concatStringsSep " "
-    (
+  escapeExecline =
+    execlineList:
+    lib.concatStringsSep " " (
       let
-        go = arg:
-          if builtins.isString arg then [ (escapeExeclineArg arg) ]
-          else if builtins.isPath arg then [ (escapeExeclineArg "${arg}") ]
-          else if lib.isDerivation arg then [ (escapeExeclineArg arg) ]
-          else if builtins.isList arg then [ "{" ] ++ builtins.concatMap go arg ++ [ "}" ]
-          else abort "escapeExecline can only hande nested lists of strings, was ${lib.generators.toPretty {} arg}";
+        go =
+          arg:
+          if builtins.isString arg then
+            [ (escapeExeclineArg arg) ]
+          else if builtins.isPath arg then
+            [ (escapeExeclineArg "${arg}") ]
+          else if lib.isDerivation arg then
+            [ (escapeExeclineArg arg) ]
+          else if builtins.isList arg then
+            [ "{" ] ++ builtins.concatMap go arg ++ [ "}" ]
+          else
+            abort "escapeExecline can only hande nested lists of strings, was ${
+              lib.generators.toPretty { } arg
+            }";
       in
       builtins.concatMap go execlineList
     );

nix/lazy-deps/default.nix

@@ -17,75 +17,82 @@ let
 
   # Create the case statement for a command invocations, optionally
   # overriding the `TARGET_TOOL` variable.
-  invoke = name: { attr, cmd ? null }: ''
-    ${name})
-      attr="${attr}"
-      ${if cmd != null then "TARGET_TOOL=\"${cmd}\"\n;;" else ";;"}
-  '';
+  invoke =
+    name:
+    {
+      attr,
+      cmd ? null,
+    }:
+    ''
+      ${name})
+        attr="${attr}"
+        ${if cmd != null then "TARGET_TOOL=\"${cmd}\"\n;;" else ";;"}
+    '';
 
   # Create command to symlink to the dispatch script for each tool.
   link = name: "ln -s $target $out/bin/${name}";
 
   invocations = tools: concatStringsSep "\n" (attrValues (mapAttrs invoke tools));
 in
-fix (self:
+fix (
+  self:
 
-# Attribute set of tools that should be lazily-added to the $PATH.
-#
-# The name of each attribute is used as the command name (on $PATH).
-# It must contain the keys 'attr' (containing the Nix attribute path
-# to the tool's derivation from the top-level), and may optionally
-# contain the key 'cmd' to override the name of the binary inside the
-# derivation.
-tools:
+  # Attribute set of tools that should be lazily-added to the $PATH.
+  #
+  # The name of each attribute is used as the command name (on $PATH).
+  # It must contain the keys 'attr' (containing the Nix attribute path
+  # to the tool's derivation from the top-level), and may optionally
+  # contain the key 'cmd' to override the name of the binary inside the
+  # derivation.
+  tools:
 
-pkgs.runCommandNoCC "lazy-dispatch"
-{
-  passthru.overrideDeps = newTools: self (tools // newTools);
-  passthru.tools = tools;
+  pkgs.runCommandNoCC "lazy-dispatch"
+    {
+      passthru.overrideDeps = newTools: self (tools // newTools);
+      passthru.tools = tools;
 
-  text = ''
-    #!${pkgs.runtimeShell}
-    set -ue
+      text = ''
+        #!${pkgs.runtimeShell}
+        set -ue
 
-    if ! type git>/dev/null || ! type nix-build>/dev/null; then
-      echo "The 'git' and 'nix-build' commands must be available." >&2
-      exit 127
-    fi
+        if ! type git>/dev/null || ! type nix-build>/dev/null; then
+          echo "The 'git' and 'nix-build' commands must be available." >&2
+          exit 127
+        fi
 
-    readonly REPO_ROOT=$(git rev-parse --show-toplevel)
-    TARGET_TOOL=$(basename "$0")
+        readonly REPO_ROOT=$(git rev-parse --show-toplevel)
+        TARGET_TOOL=$(basename "$0")
 
-    case "''${TARGET_TOOL}" in
-    ${invocations tools}
-    *)
-      echo "''${TARGET_TOOL} is currently not installed in this repository." >&2
-      exit 127
-      ;;
-    esac
+        case "''${TARGET_TOOL}" in
+        ${invocations tools}
+        *)
+          echo "''${TARGET_TOOL} is currently not installed in this repository." >&2
+          exit 127
+          ;;
+        esac
 
-    result=$(nix-build --no-out-link --attr "''${attr}" "''${REPO_ROOT}")
-    PATH="''${result}/bin:$PATH"
-    exec "''${TARGET_TOOL}" "''${@}"
-  '';
+        result=$(nix-build --no-out-link --attr "''${attr}" "''${REPO_ROOT}")
+        PATH="''${result}/bin:$PATH"
+        exec "''${TARGET_TOOL}" "''${@}"
+      '';
 
-  # Access this to get a compatible nix-shell
-  passthru.devShell = pkgs.mkShellNoCC {
-    name = "${self.name}-shell";
-    packages = [ self ];
-  };
-}
-  ''
-    # Write the dispatch code
-    target=$out/bin/__dispatch
-    mkdir -p "$(dirname "$target")"
-    echo "$text" > $target
-    chmod +x $target
+      # Access this to get a compatible nix-shell
+      passthru.devShell = pkgs.mkShellNoCC {
+        name = "${self.name}-shell";
+        packages = [ self ];
+      };
+    }
+    ''
+      # Write the dispatch code
+      target=$out/bin/__dispatch
+      mkdir -p "$(dirname "$target")"
+      echo "$text" > $target
+      chmod +x $target
 
-    # Add symlinks from all the tools to the dispatch
-    ${concatStringsSep "\n" (map link (attrNames tools))}
+      # Add symlinks from all the tools to the dispatch
+      ${concatStringsSep "\n" (map link (attrNames tools))}
 
-    # Check that it's working-ish
-    ${pkgs.stdenv.shellDryRun} $target
-  ''
+      # Check that it's working-ish
+      ${pkgs.stdenv.shellDryRun} $target
+    ''
 )

nix/readTree/default.nix

@@ -32,25 +32,30 @@ let
     map
     match
     readDir
-    substring;
+    substring
+    ;
 
-  argsWithPath = args: parts:
-    let meta.locatedAt = parts;
-    in meta // (if isAttrs args then args else args meta);
+  argsWithPath =
+    args: parts:
+    let
+      meta.locatedAt = parts;
+    in
+    meta // (if isAttrs args then args else args meta);
 
-  readDirVisible = path:
+  readDirVisible =
+    path:
     let
       children = readDir path;
       # skip hidden files, except for those that contain special instructions to readTree
       isVisible = f: f == ".skip-subtree" || f == ".skip-tree" || (substring 0 1 f) != ".";
       names = filter isVisible (attrNames children);
     in
-    listToAttrs (map
-      (name: {
+    listToAttrs (
+      map (name: {
         inherit name;
         value = children.${name};
-      })
-      names);
+      }) names
+    );
 
   # Create a mark containing the location of this attribute and
   # a list of all child attribute names added by readTree.
@@ -60,39 +65,48 @@ let
   };
 
   # Create a label from a target's tree location.
-  mkLabel = target:
-    let label = concatStringsSep "/" target.__readTree;
-    in if target ? __subtarget
-    then "${label}:${target.__subtarget}"
-    else label;
+  mkLabel =
+    target:
+    let
+      label = concatStringsSep "/" target.__readTree;
+    in
+    if target ? __subtarget then "${label}:${target.__subtarget}" else label;
 
   # Merge two attribute sets, but place attributes in `passthru` via
   # `overrideAttrs` for derivation targets that support it.
-  merge = a: b:
-    if a ? overrideAttrs
-    then
-      a.overrideAttrs
-        (prev: {
-          passthru = (prev.passthru or { }) // b;
-        })
-    else a // b;
+  merge =
+    a: b:
+    if a ? overrideAttrs then
+      a.overrideAttrs (prev: {
+        passthru = (prev.passthru or { }) // b;
+      })
+    else
+      a // b;
 
   # Import a file and enforce our calling convention
-  importFile = args: scopedArgs: path: parts: filter:
+  importFile =
+    args: scopedArgs: path: parts: filter:
     let
       importedFile =
-        if scopedArgs != { } && builtins ? scopedImport # For snix
-        then builtins.scopedImport scopedArgs path
-        else import path;
+        if
+          scopedArgs != { } && builtins ? scopedImport # For snix
+        then
+          builtins.scopedImport scopedArgs path
+        else
+          import path;
       pathType = builtins.typeOf importedFile;
     in
-    if pathType != "lambda"
-    then throw "readTree: trying to import ${toString path}, but it’s a ${pathType}, you need to make it a function like { depot, pkgs, ... }"
-    else importedFile (filter parts (argsWithPath args parts));
+    if pathType != "lambda" then
+      throw "readTree: trying to import ${toString path}, but it’s a ${pathType}, you need to make it a function like { depot, pkgs, ... }"
+    else
+      importedFile (filter parts (argsWithPath args parts));
 
-  nixFileName = file:
-    let res = match "(.*)\\.nix" file;
-    in if res == null then null else head res;
+  nixFileName =
+    file:
+    let
+      res = match "(.*)\\.nix" file;
+    in
+    if res == null then null else head res;
 
   # Internal implementation of readTree, which handles things like the
   # skipping of trees and subtrees.
@@ -105,7 +119,15 @@ let
   # The higher-level `readTree` method assembles the final attribute
   # set out of these results at the top-level, and the internal
   # `children` implementation unwraps and processes nested trees.
-  readTreeImpl = { args, initPath, rootDir, parts, argsFilter, scopedArgs }:
+  readTreeImpl =
+    {
+      args,
+      initPath,
+      rootDir,
+      parts,
+      argsFilter,
+      scopedArgs,
+    }:
     let
       dir = readDirVisible initPath;
 
@@ -123,9 +145,10 @@ let
       joinChild = c: initPath + ("/" + c);
 
       self =
-        if rootDir
-        then { __readTree = [ ]; }
-        else importFile (args // { here = result; }) scopedArgs initPath parts argsFilter;
+        if rootDir then
+          { __readTree = [ ]; }
+        else
+          importFile (args // { here = result; }) scopedArgs initPath parts argsFilter;
 
       # Import subdirectories of the current one, unless any skip
       # instructions exist.
@@ -134,88 +157,93 @@ let
       # should be ignored, but its content is not inspected by
       # readTree
       filterDir = f: dir."${f}" == "directory";
-      filteredChildren = map
-        (c: {
-          name = c;
-          value = readTreeImpl {
-            inherit argsFilter scopedArgs;
-            args = args;
-            initPath = (joinChild c);
-            rootDir = false;
-            parts = (parts ++ [ c ]);
-          };
-        })
-        (filter filterDir (attrNames dir));
+      filteredChildren = map (c: {
+        name = c;
+        value = readTreeImpl {
+          inherit argsFilter scopedArgs;
+          args = args;
+          initPath = (joinChild c);
+          rootDir = false;
+          parts = (parts ++ [ c ]);
+        };
+      }) (filter filterDir (attrNames dir));
 
       # Remove skipped children from the final set, and unwrap the
       # result set.
       children =
-        if skipSubtree then [ ]
-        else map ({ name, value }: { inherit name; value = value.ok; }) (filter (child: child.value ? ok) filteredChildren);
+        if skipSubtree then
+          [ ]
+        else
+          map (
+            { name, value }:
+            {
+              inherit name;
+              value = value.ok;
+            }
+          ) (filter (child: child.value ? ok) filteredChildren);
 
       # Import Nix files
-      nixFiles =
-        if skipSubtree then [ ]
-        else filter (f: f != null) (map nixFileName (attrNames dir));
-      nixChildren = map
-        (c:
-          let
-            p = joinChild (c + ".nix");
-            childParts = parts ++ [ c ];
-            imported = importFile (args // { here = result; }) scopedArgs p childParts argsFilter;
-          in
-          {
-            name = c;
-            value =
-              if isAttrs imported
-              then merge imported (marker childParts { })
-              else imported;
-          })
-        nixFiles;
+      nixFiles = if skipSubtree then [ ] else filter (f: f != null) (map nixFileName (attrNames dir));
+      nixChildren = map (
+        c:
+        let
+          p = joinChild (c + ".nix");
+          childParts = parts ++ [ c ];
+          imported = importFile (args // { here = result; }) scopedArgs p childParts argsFilter;
+        in
+        {
+          name = c;
+          value = if isAttrs imported then merge imported (marker childParts { }) else imported;
+        }
+      ) nixFiles;
 
       nodeValue = if dir ? "default.nix" then self else { };
 
-      allChildren = listToAttrs (
-        if dir ? "default.nix"
-        then children
-        else nixChildren ++ children
-      );
+      allChildren = listToAttrs (if dir ? "default.nix" then children else nixChildren ++ children);
 
       result =
-        if isAttrs nodeValue
-        then merge nodeValue (allChildren // (marker parts allChildren))
-        else nodeValue;
+        if isAttrs nodeValue then
+          merge nodeValue (allChildren // (marker parts allChildren))
+        else
+          nodeValue;
 
     in
-    if skipTree
-    then { skip = true; }
-    else {
-      ok = result;
-    };
+    if skipTree then
+      { skip = true; }
+    else
+      {
+        ok = result;
+      };
 
   # Top-level implementation of readTree itself.
-  readTree = args:
+  readTree =
+    args:
     let
       tree = readTreeImpl args;
     in
-    if tree ? skip
-    then throw "Top-level folder has a .skip-tree marker and could not be read by readTree!"
-    else tree.ok;
+    if tree ? skip then
+      throw "Top-level folder has a .skip-tree marker and could not be read by readTree!"
+    else
+      tree.ok;
 
   # Helper function to fetch subtargets from a target. This is a
   # temporary helper to warn on the use of the `meta.targets`
   # attribute, which is deprecated in favour of `meta.ci.targets`.
-  subtargets = node:
-    let targets = (node.meta.targets or [ ]) ++ (node.meta.ci.targets or [ ]);
-    in if node ? meta.targets then
+  subtargets =
+    node:
+    let
+      targets = (node.meta.targets or [ ]) ++ (node.meta.ci.targets or [ ]);
+    in
+    if node ? meta.targets then
       builtins.trace ''
         Warning: The meta.targets attribute is deprecated.
 
         Please move the subtargets of //${mkLabel node} to the
         meta.ci.targets attribute.
         
-      ''
-        targets else targets;
+      '' targets
+    else
+      targets;
 
   # Function which can be used to find all readTree targets within an
   # attribute set.
@@ -231,23 +259,29 @@ let
   #
   #   eligible: Function to determine whether the given derivation
   #             should be included in the build.
-  gather = eligible: node:
+  gather =
+    eligible: node:
     if node ? __readTree then
-    # Include the node itself if it is eligible.
+      # Include the node itself if it is eligible.
       (if eligible node then [ node ] else [ ])
       # Include eligible children of the node
       ++ concatMap (gather eligible) (map (attr: node."${attr}") node.__readTreeChildren)
       # Include specified sub-targets of the node
-      ++ filter eligible (map
-        (k: (node."${k}" or { }) // {
-          # Keep the same tree location, but explicitly mark this
-          # node as a subtarget.
-          __readTree = node.__readTree;
-          __readTreeChildren = [ ];
-          __subtarget = k;
-        })
-        (subtargets node))
-    else [ ];
+      ++ filter eligible (
+        map (
+          k:
+          (node."${k}" or { })
+          // {
+            # Keep the same tree location, but explicitly mark this
+            # node as a subtarget.
+            __readTree = node.__readTree;
+            __readTreeChildren = [ ];
+            __subtarget = k;
+          }
+        ) (subtargets node)
+      )
+    else
+      [ ];
 
   # Determine whether a given value is a derivation.
   # Copied from nixpkgs/lib for cases where lib is not available yet.
@@ -256,12 +290,14 @@ in
 {
   inherit gather mkLabel;
 
-  __functor = _:
-    { path
-    , args
-    , filter ? (_parts: x: x)
-    , scopedArgs ? { }
-    , rootDir ? true
+  __functor =
+    _:
+    {
+      path,
+      args,
+      filter ? (_parts: x: x),
+      scopedArgs ? { },
+      rootDir ? true,
     }:
     readTree {
       inherit args scopedArgs rootDir;
@@ -285,43 +321,56 @@ in
   #               which should be able to access the restricted folder.
   #
   #   reason: Textual explanation for the restriction (included in errors)
-  restrictFolder = { folder, exceptions ? [ ], reason }: parts: args:
-    if (elemAt parts 0) == folder || elem parts exceptions
-    then args
-    else args // {
-      depot = args.depot // {
-        "${folder}" = throw ''
-          Access to targets under //${folder} is not permitted from
-          other repository paths. Specific exceptions are configured
-          at the top-level.
+  restrictFolder =
+    {
+      folder,
+      exceptions ? [ ],
+      reason,
+    }:
+    parts: args:
+    if (elemAt parts 0) == folder || elem parts exceptions then
+      args
+    else
+      args
+      // {
+        depot = args.depot // {
+          "${folder}" = throw ''
+            Access to targets under //${folder} is not permitted from
+            other repository paths. Specific exceptions are configured
+            at the top-level.
 
-          ${reason}
-          At location: ${builtins.concatStringsSep "." parts}
-        '';
+            ${reason}
+            At location: ${builtins.concatStringsSep "." parts}
+          '';
+        };
       };
-    };
 
   # This definition of fix is identical to <nixpkgs>.lib.fix, but is
   # provided here for cases where readTree is used before nixpkgs can
   # be imported.
   #
   # It is often required to create the args attribute set.
-  fix = f: let x = f x; in x;
+  fix =
+    f:
+    let
+      x = f x;
+    in
+    x;
 
   # Takes an attribute set and adds a meta.ci.targets attribute to it
   # which contains all direct children of the attribute set which are
   # derivations.
   #
   # Type: attrs -> attrs
-  drvTargets = attrs:
-    attrs // {
+  drvTargets =
+    attrs:
+    attrs
+    // {
       # preserve .meta from original attrs
       meta = (attrs.meta or { }) // {
         # preserve .meta.ci (except .targets) from original attrs
         ci = (attrs.meta.ci or { }) // {
-          targets = builtins.filter
-            (x: isDerivation attrs."${x}")
-            (builtins.attrNames attrs);
+          targets = builtins.filter (x: isDerivation attrs."${x}") (builtins.attrNames attrs);
         };
       };
     };

nix/readTree/tests/default.nix

@@ -1,18 +1,26 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 let
   inherit (lib) partition optionalAttrs any;
   inherit (builtins) tryEval;
 
-  it = msg: asserts:
+  it =
+    msg: asserts:
     let
       results = partition (a: a.ok) asserts;
     in
     {
       _it = msg;
-    } // optionalAttrs (results.right != [ ]) {
+    }
+    // optionalAttrs (results.right != [ ]) {
       passes = map (result: result.test) results.right;
-    } // optionalAttrs (results.wrong != [ ]) {
+    }
+    // optionalAttrs (results.wrong != [ ]) {
       fails = map (result: result.test) results.wrong;
     };
 
@@ -21,16 +29,18 @@ let
     ok = a == b;
   };
 
-  assertThrows = test: value:
+  assertThrows =
+    test: value:
     let
       value' = tryEval value;
     in
     {
       inherit test;
-      ok = ! value'.success;
+      ok = !value'.success;
     };
 
-  runTestsuite = name: its:
+  runTestsuite =
+    name: its:
     let
       fails = any (it': it' ? fails) its;
     in
@@ -42,11 +52,14 @@ let
         inherit its;
       }
       (
-        if fails then ''
-          jq '.its' < .attrs.json
-        '' else ''
-          jq '.its' < .attrs.json > $out
-        ''
+        if fails then
+          ''
+            jq '.its' < .attrs.json
+          ''
+        else
+          ''
+            jq '.its' < .attrs.json > $out
+          ''
       );
 
   tree-ex = depot.nix.readTree {
@@ -55,25 +68,14 @@ let
   };
 
   example = it "corresponds to the README example" [
-    (assertEq "third_party attrset"
-      (lib.isAttrs tree-ex.third_party
-        && (! lib.isDerivation tree-ex.third_party))
-      true)
-    (assertEq "third_party attrset other attribute"
-      tree-ex.third_party.favouriteColour
-      "orange")
-    (assertEq "rustpkgs attrset aho-corasick"
-      tree-ex.third_party.rustpkgs.aho-corasick
-      "aho-corasick")
-    (assertEq "rustpkgs attrset serde"
-      tree-ex.third_party.rustpkgs.serde
-      "serde")
-    (assertEq "tools cheddear"
-      "cheddar"
-      tree-ex.tools.cheddar)
-    (assertEq "tools roquefort"
-      tree-ex.tools.roquefort
-      "roquefort")
+    (assertEq "third_party attrset" (
+      lib.isAttrs tree-ex.third_party && (!lib.isDerivation tree-ex.third_party)
+    ) true)
+    (assertEq "third_party attrset other attribute" tree-ex.third_party.favouriteColour "orange")
+    (assertEq "rustpkgs attrset aho-corasick" tree-ex.third_party.rustpkgs.aho-corasick "aho-corasick")
+    (assertEq "rustpkgs attrset serde" tree-ex.third_party.rustpkgs.serde "serde")
+    (assertEq "tools cheddear" "cheddar" tree-ex.tools.cheddar)
+    (assertEq "tools roquefort" tree-ex.tools.roquefort "roquefort")
   ];
 
   tree-tl = depot.nix.readTree {
@@ -82,65 +84,64 @@ let
   };
 
   traversal-logic = it "corresponds to the traversal logic in the README" [
-    (assertEq "skip-tree/a is read"
-      tree-tl.skip-tree.a
-      "a is read normally")
-    (assertEq "skip-tree does not contain b"
-      (builtins.attrNames tree-tl.skip-tree)
-      [ "__readTree" "__readTreeChildren" "a" ])
-    (assertEq "skip-tree children list does not contain b"
-      tree-tl.skip-tree.__readTreeChildren
-      [ "a" ])
+    (assertEq "skip-tree/a is read" tree-tl.skip-tree.a "a is read normally")
+    (assertEq "skip-tree does not contain b" (builtins.attrNames tree-tl.skip-tree) [
+      "__readTree"
+      "__readTreeChildren"
+      "a"
+    ])
+    (assertEq "skip-tree children list does not contain b" tree-tl.skip-tree.__readTreeChildren [ "a" ])
 
-    (assertEq "skip subtree default.nix is read"
-      tree-tl.skip-subtree.but
-      "the default.nix is still read")
-    (assertEq "skip subtree a/default.nix is skipped"
-      (tree-tl.skip-subtree ? a)
-      false)
-    (assertEq "skip subtree b/c.nix is skipped"
-      (tree-tl.skip-subtree ? b)
-      false)
+    (assertEq "skip subtree default.nix is read" tree-tl.skip-subtree.but
+      "the default.nix is still read"
+    )
+    (assertEq "skip subtree a/default.nix is skipped" (tree-tl.skip-subtree ? a) false)
+    (assertEq "skip subtree b/c.nix is skipped" (tree-tl.skip-subtree ? b) false)
     (assertEq "skip subtree a/default.nix would be read without .skip-subtree"
       (tree-tl.no-skip-subtree.a)
-      "am I subtree yet?")
-    (assertEq "skip subtree b/c.nix would be read without .skip-subtree"
-      (tree-tl.no-skip-subtree.b.c)
-      "cool")
+      "am I subtree yet?"
+    )
+    (assertEq "skip subtree b/c.nix would be read without .skip-subtree" (tree-tl.no-skip-subtree.b.c
+    ) "cool")
 
-    (assertEq "default.nix attrset is merged with siblings"
-      tree-tl.default-nix.no
-      "siblings should be read")
-    (assertEq "default.nix means sibling isn’t read"
-      (tree-tl.default-nix ? sibling)
-      false)
+    (assertEq "default.nix attrset is merged with siblings" tree-tl.default-nix.no
+      "siblings should be read"
+    )
+    (assertEq "default.nix means sibling isn’t read" (tree-tl.default-nix ? sibling) false)
     (assertEq "default.nix means subdirs are still read and merged into default.nix"
       (tree-tl.default-nix.subdir.a)
-      "but I’m picked up")
+      "but I’m picked up"
+    )
 
-    (assertEq "default.nix can be not an attrset"
-      tree-tl.default-nix.no-merge
-      "I’m not merged with any children")
-    (assertEq "default.nix is not an attrset -> children are not merged"
-      (tree-tl.default-nix.no-merge ? subdir)
-      false)
+    (assertEq "default.nix can be not an attrset" tree-tl.default-nix.no-merge
+      "I’m not merged with any children"
+    )
+    (assertEq "default.nix is not an attrset -> children are not merged" (
+      tree-tl.default-nix.no-merge ? subdir
+    ) false)
 
-    (assertEq "default.nix can contain a derivation"
-      (lib.isDerivation tree-tl.default-nix.can-be-drv)
-      true)
+    (assertEq "default.nix can contain a derivation" (lib.isDerivation tree-tl.default-nix.can-be-drv)
+      true
+    )
     (assertEq "Even if default.nix is a derivation, children are traversed and merged"
       tree-tl.default-nix.can-be-drv.subdir.a
-      "Picked up through the drv")
-    (assertEq "default.nix drv is not changed by readTree"
-      tree-tl.default-nix.can-be-drv
-      (import ./test-tree-traversal/default-nix/can-be-drv/default.nix { }))
+      "Picked up through the drv"
+    )
+    (assertEq "default.nix drv is not changed by readTree" tree-tl.default-nix.can-be-drv (
+      import ./test-tree-traversal/default-nix/can-be-drv/default.nix { }
+    ))
     (assertEq "`here` argument represents the attrset a given file is part of"
-      (builtins.removeAttrs tree-tl.here-arg [ "__readTree" "__readTreeChildren" "subdir" ])
+      (builtins.removeAttrs tree-tl.here-arg [
+        "__readTree"
+        "__readTreeChildren"
+        "subdir"
+      ])
       {
         attr1 = "foo";
         attr2 = "foo";
         attr3 = "sibl1";
-      })
+      }
+    )
   ];
 
   # these each call readTree themselves because the throws have to happen inside assertThrows
@@ -149,7 +150,8 @@ let
       (depot.nix.readTree {
         path = ./test-wrong-not-a-function;
         args = { };
-      }).not-a-function)
+      }).not-a-function
+    )
     # can’t test for that, assertThrows can’t catch this error
     # (assertThrows "this file is a function but doesn’t have dots"
     #   (depot.nix.readTree {} ./test-wrong-no-dots).no-dots-in-function)
@@ -160,22 +162,36 @@ let
     args = { };
   };
 
-  assertMarkerByPath = path:
+  assertMarkerByPath =
+    path:
     assertEq "${lib.concatStringsSep "." path} is marked correctly"
       (lib.getAttrFromPath path read-markers).__readTree
       path;
 
   markers = it "marks nodes correctly" [
     (assertMarkerByPath [ "directory-marked" ])
-    (assertMarkerByPath [ "directory-marked" "nested" ])
-    (assertMarkerByPath [ "file-children" "one" ])
-    (assertMarkerByPath [ "file-children" "two" ])
-    (assertEq "nix file children are marked correctly"
-      read-markers.file-children.__readTreeChildren [ "one" "two" ])
-    (assertEq "directory children are marked correctly"
-      read-markers.directory-marked.__readTreeChildren [ "nested" ])
-    (assertEq "absence of children is marked"
-      read-markers.directory-marked.nested.__readTreeChildren [ ])
+    (assertMarkerByPath [
+      "directory-marked"
+      "nested"
+    ])
+    (assertMarkerByPath [
+      "file-children"
+      "one"
+    ])
+    (assertMarkerByPath [
+      "file-children"
+      "two"
+    ])
+    (assertEq "nix file children are marked correctly" read-markers.file-children.__readTreeChildren [
+      "one"
+      "two"
+    ])
+    (assertEq "directory children are marked correctly" read-markers.directory-marked.__readTreeChildren
+      [ "nested" ]
+    )
+    (assertEq "absence of children is marked" read-markers.directory-marked.nested.__readTreeChildren
+      [ ]
+    )
   ];
 
 in

nix/readTree/tests/test-marker/directory-marked/default.nix

@@ -1,3 +1,4 @@
 { ... }:
 
-{ }
+{
+}

nix/readTree/tests/test-marker/directory-marked/nested/default.nix

@@ -1,3 +1,4 @@
 { ... }:
 
-{ }
+{
+}

nix/readTree/tests/test-marker/file-children/one.nix

@@ -1,3 +1,4 @@
 { ... }:
 
-{ }
+{
+}

nix/readTree/tests/test-marker/file-children/two.nix

@@ -1,3 +1,4 @@
 { ... }:
 
-{ }
+{
+}

nix/readTree/tests/test-tree-traversal/default-nix/can-be-drv/default.nix

@@ -3,5 +3,8 @@ derivation {
   name = "im-a-drv";
   system = builtins.currentSystem;
   builder = "/bin/sh";
-  args = [ "-c" ''echo "" > $out'' ];
+  args = [
+    "-c"
+    ''echo "" > $out''
+  ];
 }

nix/readTree/tests/test-tree-traversal/here-arg/default.nix

@@ -1,4 +1,5 @@
-{ here, ... }: {
+{ here, ... }:
+{
   attr1 = "foo";
   attr2 = here.attr1;
 

nix/readTree/tests/test-tree-traversal/here-arg/subdir/sibl2.nix

@@ -1,2 +1 @@
-{ here, ... }:
-here.sibl1
+{ here, ... }: here.sibl1

nix/readTree/tests/test-wrong-no-dots/no-dots-in-function.nix

@@ -1,3 +1,3 @@
-{}:
+{ }:
 
 "This is a function, but readTree wants to pass a bunch of arguments, and not having dots means we depend on exactly which arguments."

nix/sparseTree/default.nix

@@ -15,19 +15,19 @@
 
 {
   # root path to use as a reference point
-  root
-, # list of paths below `root` that should be
+  root,
+  # list of paths below `root` that should be
   # included in the resulting directory
   #
   # If path, need to refer to the actual file / directory to be included.
   # If a string, it is treated as a string relative to the root.
-  paths
-, # (optional) name to use for the derivation
+  paths,
+  # (optional) name to use for the derivation
   #
   # This should always be set when using roots that do not have
   # controlled names, such as when passing the top-level of a git
   # repository (e.g. `depot.path.origSrc`).
-  name ? builtins.baseNameOf root
+  name ? builtins.baseNameOf root,
 }:
 
 let
@@ -36,12 +36,14 @@ let
   # Count slashes in a path.
   #
   # Type: path -> int
-  depth = path: lib.pipe path [
-    toString
-    (builtins.split "/")
-    (builtins.filter builtins.isList)
-    builtins.length
-  ];
+  depth =
+    path:
+    lib.pipe path [
+      toString
+      (builtins.split "/")
+      (builtins.filter builtins.isList)
+      builtins.length
+    ];
 
   # (Parent) directories will be created from deepest to shallowest
   # which should mean no conflicts are caused unless both a child
@@ -52,19 +54,24 @@ let
   # Create a set which contains the source path to copy / symlink and
   # it's destination, so the path below the destination root including
   # a leading slash. Additionally some sanity checking is done.
-  makeSymlink = path:
+  makeSymlink =
+    path:
     let
       withLeading = p: if builtins.substring 0 1 p == "/" then p else "/" + p;
       fullPath =
-        if builtins.isPath path then path
-        else if builtins.isString path then (root + withLeading path)
-        else builtins.throw "Unsupported path type ${builtins.typeOf path}";
+        if builtins.isPath path then
+          path
+        else if builtins.isString path then
+          (root + withLeading path)
+        else
+          builtins.throw "Unsupported path type ${builtins.typeOf path}";
       strPath = toString fullPath;
       contextPath = "${fullPath}";
       belowRoot = builtins.substring rootLength (-1) strPath;
       prefix = builtins.substring 0 rootLength strPath;
     in
-    assert toString root == prefix; {
+    assert toString root == prefix;
+    {
       src = contextPath;
       dst = belowRoot;
     };
@@ -73,12 +80,13 @@ let
 in
 
 # TODO(sterni): teach readTree to also read symlinked directories,
-  # so we ln -sT instead of cp -aT.
+# so we ln -sT instead of cp -aT.
 pkgs.runCommand "sparse-${name}" { } (
-  lib.concatMapStrings
-    ({ src, dst }: ''
+  lib.concatMapStrings (
+    { src, dst }:
+    ''
       mkdir -p "$(dirname "$out${dst}")"
       cp -aT --reflink=auto "${src}" "$out${dst}"
-    '')
-    symlinks
+    ''
+  ) symlinks
 )

nix/stateMonad/default.nix

@@ -10,26 +10,23 @@ rec {
   #
 
   # Type: stateMonad s a -> (a -> stateMonad s b) -> stateMonad s b
-  bind = action: f: state:
+  bind =
+    action: f: state:
     let
       afterAction = action state;
     in
     (f afterAction.value) afterAction.state;
 
   # Type: stateMonad s a -> stateMonad s b -> stateMonad s b
-  after = action1: action2: state: action2 (action1 state).state;
+  after =
+    action1: action2: state:
+    action2 (action1 state).state;
 
   # Type: stateMonad s (stateMonad s a) -> stateMonad s a
   join = action: bind action (action': action');
 
   # Type: [a] -> (a -> stateMonad s b) -> stateMonad s null
-  for_ = xs: f:
-    builtins.foldl'
-      (laterAction: x:
-        after (f x) laterAction
-      )
-      (pure null)
-      xs;
+  for_ = xs: f: builtins.foldl' (laterAction: x: after (f x) laterAction) (pure null) xs;
 
   #
   # Applicative
@@ -52,10 +49,16 @@ rec {
   #
 
   # Type: (s -> s) -> stateMonad s null
-  modify = f: state: { value = null; state = f state; };
+  modify = f: state: {
+    value = null;
+    state = f state;
+  };
 
   # Type: stateMonad s s
-  get = state: { value = state; inherit state; };
+  get = state: {
+    value = state;
+    inherit state;
+  };
 
   # Type: s -> stateMonad s null
   set = new: modify (_: new);
@@ -64,9 +67,15 @@ rec {
   getAttr = attr: fmap (state: state.${attr}) get;
 
   # Type: str -> (any -> any) -> stateMonad s null
-  modifyAttr = attr: f: modify (state: state // {
-    ${attr} = f state.${attr};
-  });
+  modifyAttr =
+    attr: f:
+    modify (
+      state:
+      state
+      // {
+        ${attr} = f state.${attr};
+      }
+    );
 
   # Type: str -> any -> stateMonad s null
   setAttr = attr: value: modifyAttr attr (_: value);

nix/tag/default.nix

@@ -3,28 +3,33 @@ let
   # Takes a tag, checks whether it is an attrset with one element,
   # if so sets `isTag` to `true` and sets the name and value.
   # If not, sets `isTag` to `false` and sets `errmsg`.
-  verifyTag = tag:
+  verifyTag =
+    tag:
     let
       cases = builtins.attrNames tag;
       len = builtins.length cases;
     in
-    if builtins.length cases == 1
-    then
-      let name = builtins.head cases; in {
+    if builtins.length cases == 1 then
+      let
+        name = builtins.head cases;
+      in
+      {
         isTag = true;
         name = name;
         val = tag.${name};
         errmsg = null;
       }
-    else {
-      isTag = false;
-      errmsg =
-        ("match: an instance of a sum is an attrset "
+    else
+      {
+        isTag = false;
+        errmsg = (
+          "match: an instance of a sum is an attrset "
           + "with exactly one element, yours had ${toString len}"
-          + ", namely: ${lib.generators.toPretty {} cases}");
-      name = null;
-      val = null;
-    };
+          + ", namely: ${lib.generators.toPretty { } cases}"
+        );
+        name = null;
+        val = null;
+      };
 
   # Returns the tag name of a given tag attribute set.
   # Throws if the tag is invalid.
@@ -39,11 +44,15 @@ let
   tagValue = tag: (assertIsTag tag).val;
 
   # like `verifyTag`, but throws the error message if it is not a tag.
-  assertIsTag = tag:
-    let res = verifyTag tag; in
+  assertIsTag =
+    tag:
+    let
+      res = verifyTag tag;
+    in
     assert res.isTag || throw res.errmsg;
-    { inherit (res) name val; };
-
+    {
+      inherit (res) name val;
+    };
 
   # Discriminator for values.
   # Goes through a list of tagged predicates `{ <tag> = <pred>; }`
@@ -64,22 +73,22 @@ let
   #     { negative = i: i < 0; }
   #   ] 1
   #   => { smol = 1; }
-  discrDef = defTag: fs: v:
+  discrDef =
+    defTag: fs: v:
     let
-      res = lib.findFirst
-        (t: t.val v)
-        null
-        (map assertIsTag fs);
+      res = lib.findFirst (t: t.val v) null (map assertIsTag fs);
     in
-    if res == null
-    then { ${defTag} = v; }
-    else { ${res.name} = v; };
+    if res == null then { ${defTag} = v; } else { ${res.name} = v; };
 
   # Like `discrDef`, but fail if there is no match.
-  discr = fs: v:
-    let res = discrDef null fs v; in
-    assert lib.assertMsg (res != { })
-      "tag.discr: No predicate found that matches ${lib.generators.toPretty {} v}";
+  discr =
+    fs: v:
+    let
+      res = discrDef null fs v;
+    in
+    assert lib.assertMsg (
+      res != { }
+    ) "tag.discr: No predicate found that matches ${lib.generators.toPretty { } v}";
     res;
 
   # The canonical pattern matching primitive.
@@ -104,20 +113,27 @@ let
   #       match success matcher == 43
   #    && match failure matcher == 0;
   #
-  match = sum: matcher:
-    let cases = builtins.attrNames sum;
-    in assert
-    let len = builtins.length cases; in
-    lib.assertMsg (len == 1)
-      ("match: an instance of a sum is an attrset "
+  match =
+    sum: matcher:
+    let
+      cases = builtins.attrNames sum;
+    in
+    assert
+      let
+        len = builtins.length cases;
+      in
+      lib.assertMsg (len == 1) (
+        "match: an instance of a sum is an attrset "
         + "with exactly one element, yours had ${toString len}"
-        + ", namely: ${lib.generators.toPretty {} cases}");
-    let case = builtins.head cases;
-    in assert
-    lib.assertMsg (matcher ? ${case})
-      ("match: \"${case}\" is not a valid case of this sum, "
-        + "the matcher accepts: ${lib.generators.toPretty {}
-            (builtins.attrNames matcher)}");
+        + ", namely: ${lib.generators.toPretty { } cases}"
+      );
+    let
+      case = builtins.head cases;
+    in
+    assert lib.assertMsg (matcher ? ${case}) (
+      "match: \"${case}\" is not a valid case of this sum, "
+      + "the matcher accepts: ${lib.generators.toPretty { } (builtins.attrNames matcher)}"
+    );
     matcher.${case} sum.${case};
 
   # A `match` with the arguments flipped.

nix/utils/default.nix

@@ -1,100 +1,99 @@
 { depot, lib, ... }:
 
 let
-  /* Get the basename of a store path without
-     the leading hash.
+  /*
+    Get the basename of a store path without
+    the leading hash.
 
-     Type: (path | drv | string) -> string
+    Type: (path | drv | string) -> string
 
-     Example:
-       storePathName ./foo.c
-       => "foo.c"
+    Example:
+      storePathName ./foo.c
+      => "foo.c"
 
-       storePathName (writeText "foo.c" "int main() { return 0; }")
-       => "foo.c"
+      storePathName (writeText "foo.c" "int main() { return 0; }")
+      => "foo.c"
 
-       storePathName "${hello}/bin/hello"
-       => "hello"
+      storePathName "${hello}/bin/hello"
+      => "hello"
   */
-  storePathName = p:
-    if lib.isDerivation p
-    then p.name
-    else if builtins.isPath p
-    then builtins.baseNameOf p
-    else if builtins.isString p || (builtins.isAttrs p && (p ? outPath || p ? __toString))
-    then
+  storePathName =
+    p:
+    if lib.isDerivation p then
+      p.name
+    else if builtins.isPath p then
+      builtins.baseNameOf p
+    else if builtins.isString p || (builtins.isAttrs p && (p ? outPath || p ? __toString)) then
       let
         strPath = toString p;
         # strip leading storeDir and trailing slashes
-        noStoreDir = lib.removeSuffix "/"
-          (lib.removePrefix "${builtins.storeDir}/" strPath);
+        noStoreDir = lib.removeSuffix "/" (lib.removePrefix "${builtins.storeDir}/" strPath);
         # a basename of a child of a store path isn't really
         # referring to a store path, so removing the string
         # context is safe (e. g. "hello" for "${hello}/bin/hello").
-        basename = builtins.unsafeDiscardStringContext
-          (builtins.baseNameOf strPath);
+        basename = builtins.unsafeDiscardStringContext (builtins.baseNameOf strPath);
       in
       # If p is a direct child of storeDir, we need to remove
-        # the leading hash as well to make sure that:
-        # `storePathName drv == storePathName (toString drv)`.
-      if noStoreDir == basename
-      then builtins.substring 33 (-1) basename
-      else basename
-    else builtins.throw "Don't know how to get (base)name of "
-      + lib.generators.toPretty { } p;
+      # the leading hash as well to make sure that:
+      # `storePathName drv == storePathName (toString drv)`.
+      if noStoreDir == basename then builtins.substring 33 (-1) basename else basename
+    else
+      builtins.throw "Don't know how to get (base)name of " + lib.generators.toPretty { } p;
 
-  /* Query the type of a path exposing the same information as would be by
-     `builtins.readDir`, but for a single, specific target path.
+  /*
+    Query the type of a path exposing the same information as would be by
+    `builtins.readDir`, but for a single, specific target path.
 
-     The information is returned as a tagged value, i. e. an attribute set with
-     exactly one attribute where the type of the path is encoded in the name
-     of the single attribute. The allowed tags and values are as follows:
+    The information is returned as a tagged value, i. e. an attribute set with
+    exactly one attribute where the type of the path is encoded in the name
+    of the single attribute. The allowed tags and values are as follows:
 
-     * `regular`: is a regular file, always `true` if returned
-     * `directory`: is a directory, always `true` if returned
-     * `missing`: path does not exist, always `true` if returned
-     * `symlink`: path is a symlink, always `true` if returned
+    * `regular`: is a regular file, always `true` if returned
+    * `directory`: is a directory, always `true` if returned
+    * `missing`: path does not exist, always `true` if returned
+    * `symlink`: path is a symlink, always `true` if returned
 
-     Type: path(-like) -> tag
+    Type: path(-like) -> tag
 
-     `tag` refers to the attribute set format of `//nix/tag`.
+    `tag` refers to the attribute set format of `//nix/tag`.
 
-     Example:
-       pathType ./foo.c
-       => { regular = true; }
+    Example:
+      pathType ./foo.c
+      => { regular = true; }
 
-       pathType /home/lukas
-       => { directory = true; }
+      pathType /home/lukas
+      => { directory = true; }
 
-       pathType ./result
-       => { symlink = true; }
+      pathType ./result
+      => { symlink = true; }
 
-       pathType ./link-to-file
-       => { symlink = true; }
+      pathType ./link-to-file
+      => { symlink = true; }
 
-       pathType /does/not/exist
-       => { missing = true; }
+      pathType /does/not/exist
+      => { missing = true; }
 
-       # Check if a path exists
-       !(pathType /file ? missing)
+      # Check if a path exists
+      !(pathType /file ? missing)
 
-       # Check if a path is a directory or a symlink to a directory
-       # A handy shorthand for this is provided as `realPathIsDirectory`.
-       pathType /path ? directory || (pathType /path).symlink or null == "directory"
+      # Check if a path is a directory or a symlink to a directory
+      # A handy shorthand for this is provided as `realPathIsDirectory`.
+      pathType /path ? directory || (pathType /path).symlink or null == "directory"
 
-       # Match on the result using //nix/tag
-       nix.tag.match (nix.utils.pathType ./result) {
-         symlink = _: "symlink";
-         directory  = _: "directory";
-         regular = _: "regular";
-         missing = _: "path does not exist";
-       }
-       => "symlink"
+      # Match on the result using //nix/tag
+      nix.tag.match (nix.utils.pathType ./result) {
+        symlink = _: "symlink";
+        directory  = _: "directory";
+        regular = _: "regular";
+        missing = _: "path does not exist";
+      }
+      => "symlink"
 
-       # Query path type
-       nix.tag.tagName (pathType /path)
+      # Query path type
+      nix.tag.tagName (pathType /path)
   */
-  pathType = path:
+  pathType =
+    path:
     let
       # baseNameOf is very annoyed if we proceed with string context.
       # We need to call toString to prevent unsafeDiscardStringContext
@@ -119,52 +118,56 @@ let
       ${thisPathType} = true;
     };
 
-  pathType' = path:
+  pathType' =
+    path:
     let
       p = pathType path;
     in
-    if p ? missing
-    then builtins.throw "${lib.generators.toPretty {} path} does not exist"
-    else p;
+    if p ? missing then builtins.throw "${lib.generators.toPretty { } path} does not exist" else p;
 
-  /* Check whether the given path is a directory.
-     Throws if the path in question doesn't exist.
+  /*
+    Check whether the given path is a directory.
+    Throws if the path in question doesn't exist.
 
-     Type: path(-like) -> bool
+    Type: path(-like) -> bool
   */
   isDirectory = path: pathType' path ? directory;
 
-  /* Check whether the given path is a regular file.
-     Throws if the path in question doesn't exist.
+  /*
+    Check whether the given path is a regular file.
+    Throws if the path in question doesn't exist.
 
-     Type: path(-like) -> bool
+    Type: path(-like) -> bool
   */
   isRegularFile = path: pathType' path ? regular;
 
-  /* Check whether the given path is a symbolic link.
-     Throws if the path in question doesn't exist.
+  /*
+    Check whether the given path is a symbolic link.
+    Throws if the path in question doesn't exist.
 
-     Type: path(-like) -> bool
+    Type: path(-like) -> bool
   */
   isSymlink = path: pathType' path ? symlink;
 
-  /* Checks whether the given value is (or contains) a reference to a
-     path that will be retained in the store path resulting from a derivation.
-     So if isReferencablePath returns true, the given value may be used in a
-     way that allows accessing it at runtime of any Nix built program.
+  /*
+    Checks whether the given value is (or contains) a reference to a
+    path that will be retained in the store path resulting from a derivation.
+    So if isReferencablePath returns true, the given value may be used in a
+    way that allows accessing it at runtime of any Nix built program.
 
-     Returns true for:
+    Returns true for:
 
-     - Strings with context (if the string is/contains a single path is not verified!)
-     - Path values
-     - Derivations
+    - Strings with context (if the string is/contains a single path is not verified!)
+    - Path values
+    - Derivations
 
-     Note that the value still needs to used in a way that forces string context
-     (and thus reference tracking) to be created, e.g. in string interpolation.
+    Note that the value still needs to used in a way that forces string context
+    (and thus reference tracking) to be created, e.g. in string interpolation.
 
-     Type: any -> bool
+    Type: any -> bool
   */
-  isReferencablePath = value:
+  isReferencablePath =
+    value:
     builtins.isPath value
     || lib.isDerivation value
     || (builtins.isString value && builtins.hasContext value);

nix/writeTree/default.nix

@@ -1,35 +1,55 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 let
-  inherit (lib) fix pipe mapAttrsToList isAttrs concatLines isString isDerivation isPath;
+  inherit (lib)
+    fix
+    pipe
+    mapAttrsToList
+    isAttrs
+    concatLines
+    isString
+    isDerivation
+    isPath
+    ;
   inherit (depot.nix.utils) isReferencablePath;
 
-  esc = s: lib.escapeShellArg /* ensure paths import into store */ "${s}";
+  esc =
+    s:
+    lib.escapeShellArg # ensure paths import into store
+      "${s}";
 
-  writeTreeAtPath = path: tree:
+  writeTreeAtPath =
+    path: tree:
     ''
       mkdir -p "$out/"${esc path}
     ''
     + pipe tree [
-      (mapAttrsToList (k: v:
+      (mapAttrsToList (
+        k: v:
         if isReferencablePath v then
           "cp -R --reflink=auto ${esc "${v}"} \"$out/\"${esc path}/${esc k}"
         else if lib.isAttrs v then
           writeTreeAtPath (path + "/" + k) v
         else
-          throw "invalid type (expected path, derivation, string with context, or attrs)"))
+          throw "invalid type (expected path, derivation, string with context, or attrs)"
+      ))
       concatLines
     ];
 
-  /* Create a directory tree specified by a Nix attribute set structure.
+  /*
+    Create a directory tree specified by a Nix attribute set structure.
 
-     Each value in `tree` should either be a file, a directory, or another tree
-     attribute set. Those paths will be written to a directory tree
-     corresponding to the structure of the attribute set.
+    Each value in `tree` should either be a file, a directory, or another tree
+    attribute set. Those paths will be written to a directory tree
+    corresponding to the structure of the attribute set.
 
-     Type: string -> attrSet -> derivation
+    Type: string -> attrSet -> derivation
   */
-  writeTree = name: tree:
-    pkgs.runCommandLocal name { } (writeTreeAtPath "" tree);
+  writeTree = name: tree: pkgs.runCommandLocal name { } (writeTreeAtPath "" tree);
 in
 
 # __functor trick so readTree can add the tests attribute

nix/writeTree/tests/default.nix

@@ -1,93 +1,102 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 let
   inherit (pkgs) runCommand writeText writeTextFile;
   inherit (depot.nix) writeTree;
 
-  checkTree = name: tree: expected:
+  checkTree =
+    name: tree: expected:
     runCommand "writeTree-test-${name}"
       {
         nativeBuildInputs = [ pkgs.buildPackages.lr ];
         passAsFile = [ "expected" ];
         inherit expected;
-      } ''
-      actualPath="$NIX_BUILD_TOP/actual"
-      cd ${lib.escapeShellArg (writeTree name tree)}
-      lr . > "$actualPath"
-      diff -u "$expectedPath" "$actualPath" | tee "$out"
-    '';
+      }
+      ''
+        actualPath="$NIX_BUILD_TOP/actual"
+        cd ${lib.escapeShellArg (writeTree name tree)}
+        lr . > "$actualPath"
+        diff -u "$expectedPath" "$actualPath" | tee "$out"
+      '';
 in
 
 depot.nix.readTree.drvTargets {
-  empty = checkTree "empty" { }
-    ''
-      .
-    '';
+  empty = checkTree "empty" { } ''
+    .
+  '';
 
-  simple-paths = checkTree "simple"
-    {
-      writeTree = {
-        meta = {
-          "owners.txt" = ../OWNERS;
+  simple-paths =
+    checkTree "simple"
+      {
+        writeTree = {
+          meta = {
+            "owners.txt" = ../OWNERS;
+          };
+          "code.nix" = ../default.nix;
+          all-tests = ./.;
+          nested.dirs.eval-time = builtins.toFile "owothia" ''
+            hold me owo
+          '';
         };
-        "code.nix" = ../default.nix;
-        all-tests = ./.;
-        nested.dirs.eval-time = builtins.toFile "owothia" ''
-          hold me owo
-        '';
-      };
-    }
-    ''
-      .
-      ./writeTree
-      ./writeTree/all-tests
-      ./writeTree/all-tests/default.nix
-      ./writeTree/code.nix
-      ./writeTree/meta
-      ./writeTree/meta/owners.txt
-      ./writeTree/nested
-      ./writeTree/nested/dirs
-      ./writeTree/nested/dirs/eval-time
-    '';
-
-  empty-dirs = checkTree "empty-dirs"
-    {
-      this.dir.is.empty = { };
-      so.is.this.one = { };
-    }
-    ''
-      .
-      ./so
-      ./so/is
-      ./so/is/this
-      ./so/is/this/one
-      ./this
-      ./this/dir
-      ./this/dir/is
-      ./this/dir/is/empty
-    '';
-
-  drvs = checkTree "drvs"
-    {
-      file-drv = writeText "road.txt" ''
-        Any road followed precisely to its end leads precisely nowhere.
+      }
+      ''
+        .
+        ./writeTree
+        ./writeTree/all-tests
+        ./writeTree/all-tests/default.nix
+        ./writeTree/code.nix
+        ./writeTree/meta
+        ./writeTree/meta/owners.txt
+        ./writeTree/nested
+        ./writeTree/nested/dirs
+        ./writeTree/nested/dirs/eval-time
       '';
-      dir-drv = writeTextFile {
-        name = "dir-of-text";
-        destination = "/text/in/more/dirs.txt";
-        text = ''
-          Climb the mountain just a little bit to test that it’s a mountain.
-          From the top of the mountain, you cannot see the mountain.
+
+  empty-dirs =
+    checkTree "empty-dirs"
+      {
+        this.dir.is.empty = { };
+        so.is.this.one = { };
+      }
+      ''
+        .
+        ./so
+        ./so/is
+        ./so/is/this
+        ./so/is/this/one
+        ./this
+        ./this/dir
+        ./this/dir/is
+        ./this/dir/is/empty
+      '';
+
+  drvs =
+    checkTree "drvs"
+      {
+        file-drv = writeText "road.txt" ''
+          Any road followed precisely to its end leads precisely nowhere.
         '';
-      };
-    }
-    ''
-      .
-      ./dir-drv
-      ./dir-drv/text
-      ./dir-drv/text/in
-      ./dir-drv/text/in/more
-      ./dir-drv/text/in/more/dirs.txt
-      ./file-drv
-    '';
+        dir-drv = writeTextFile {
+          name = "dir-of-text";
+          destination = "/text/in/more/dirs.txt";
+          text = ''
+            Climb the mountain just a little bit to test that it’s a mountain.
+            From the top of the mountain, you cannot see the mountain.
+          '';
+        };
+      }
+      ''
+        .
+        ./dir-drv
+        ./dir-drv/text
+        ./dir-drv/text/in
+        ./dir-drv/text/in/more
+        ./dir-drv/text/in/more/dirs.txt
+        ./file-drv
+      '';
 }

ops/buildkite/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 depot.nix.readTree.drvTargets rec {
   terraform = pkgs.terraform.withPlugins (p: [

ops/dashboards/default.nix

@@ -1,4 +1,5 @@
-{ ... }: {
+{ ... }:
+{
   node_exporter = ./json/node_exporter.json;
   all = ./json;
 }

ops/dns/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 depot.nix.readTree.drvTargets rec {
   # Provide a Terraform wrapper with the right provider installed.

ops/gerrit-tvl/default.nix

@@ -1,4 +1,9 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 { gerrit }:
 
 let

ops/hcloud/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 depot.nix.readTree.drvTargets rec {
   terraform = pkgs.terraform.withPlugins (p: [

ops/hetzner-s3/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 depot.nix.readTree.drvTargets rec {
   terraform = pkgs.terraform.withPlugins (p: [

ops/keycloak/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}:
 
 depot.nix.readTree.drvTargets rec {
   # Provide a Terraform wrapper with the right provider installed.

ops/machines/archivist-ec2/default.nix

@@ -21,10 +21,11 @@ in
     path = [ depot.contrib.archivist.parse-bucket-logs ];
     serviceConfig = {
       Type = "oneshot";
-      ExecStart = (pkgs.writers.writePython3 "parse-bucket-logs-continuously"
-        {
+      ExecStart = (
+        pkgs.writers.writePython3 "parse-bucket-logs-continuously" {
           libraries = [ pkgs.python3Packages.boto3 ];
-        } ./parse-bucket-logs-continuously.py);
+        } ./parse-bucket-logs-continuously.py
+      );
       DynamicUser = "yes";
       StateDirectory = "parse-bucket-logs";
     };
@@ -38,4 +39,3 @@ in
 
   system.stateVersion = "23.05"; # Did you read the comment?
 }
-

ops/machines/archivist-ec2/hardware-configuration.nix

@@ -1,27 +1,30 @@
 { lib, modulesPath, ... }:
 
 {
-  imports =
-    [
-      (modulesPath + "/profiles/qemu-guest.nix")
-    ];
+  imports = [
+    (modulesPath + "/profiles/qemu-guest.nix")
+  ];
 
-  boot.initrd.availableKernelModules = [ "ahci" "xhci_pci" "virtio_pci" "sr_mod" "virtio_blk" ];
+  boot.initrd.availableKernelModules = [
+    "ahci"
+    "xhci_pci"
+    "virtio_pci"
+    "sr_mod"
+    "virtio_blk"
+  ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/" =
-    {
-      device = "/dev/disk/by-partlabel/root";
-      fsType = "xfs";
-    };
+  fileSystems."/" = {
+    device = "/dev/disk/by-partlabel/root";
+    fsType = "xfs";
+  };
 
-  fileSystems."/boot" =
-    {
-      device = "/dev/disk/by-partlabel/boot";
-      fsType = "vfat";
-    };
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-partlabel/boot";
+    fsType = "vfat";
+  };
 
   swapDevices = [ ];
 

ops/machines/build01/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }: # readTree options
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}: # readTree options
 { config, ... }: # passed by module system
 let
   mod = name: depot.path.origSrc + ("/ops/modules/" + name);
@@ -24,7 +29,11 @@ in
   boot.specialFileSystems = lib.mkForce {
     "/run/wrappers" = {
       fsType = "tmpfs";
-      options = [ "nodev" "mode=755" "size=${config.security.wrapperDirSize}" ];
+      options = [
+        "nodev"
+        "mode=755"
+        "size=${config.security.wrapperDirSize}"
+      ];
     };
   };
 
@@ -56,10 +65,17 @@ in
 
     interfaces.host0.ipv6 = {
       addresses = [
-        { address = "2001:bc8:38ee:100:7000::20"; prefixLength = 64; }
+        {
+          address = "2001:bc8:38ee:100:7000::20";
+          prefixLength = 64;
+        }
       ];
       routes = [
-        { address = "64:ff9b::"; via = "2001:bc8:38ee:100::100"; prefixLength = 96; }
+        {
+          address = "64:ff9b::";
+          via = "2001:bc8:38ee:100::100";
+          prefixLength = 96;
+        }
       ];
     };
 
@@ -112,7 +128,8 @@ in
   ];
 
   time.timeZone = "UTC";
-  users.users.root.openssh.authorizedKeys.keys = depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
+  users.users.root.openssh.authorizedKeys.keys =
+    depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
   users.groups.kvm = { };
   users.users.root.extraGroups = [ "kvm" ];
 

ops/machines/gerrit01/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }: # readTree options
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}: # readTree options
 { config, ... }: # passed by module system
 
 let
@@ -111,7 +116,8 @@ in
       createHome = true;
       home = "/var/lib/git";
     };
-    users.root.openssh.authorizedKeys.keys = depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
+    users.root.openssh.authorizedKeys.keys =
+      depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
   };
 
   boot.initrd.systemd.enable = true;

ops/machines/meta01/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }: # readTree options
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}: # readTree options
 { config, ... }: # passed by module system
 
 let
@@ -130,7 +135,8 @@ in
   # Required for prometheus to be able to scrape stats
   services.nginx.statusPage = true;
 
-  users.users.root.openssh.authorizedKeys.keys = depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
+  users.users.root.openssh.authorizedKeys.keys =
+    depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
 
   boot.initrd.systemd.enable = true;
   zramSwap.enable = true;

ops/machines/public01/default.nix

@@ -1,4 +1,9 @@
-{ depot, lib, pkgs, ... }: # readTree options
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}: # readTree options
 { config, ... }: # passed by module system
 
 let
@@ -158,7 +163,8 @@ in
   # Required for prometheus to be able to scrape stats
   services.nginx.statusPage = true;
 
-  users.users.root.openssh.authorizedKeys.keys = depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
+  users.users.root.openssh.authorizedKeys.keys =
+    depot.ops.users.edef ++ depot.ops.users.flokli ++ depot.ops.users.raito;
 
   boot.initrd.systemd.enable = true;
   zramSwap.enable = true;

ops/machines/snix-cache/default.nix

@@ -1,18 +1,24 @@
-{ depot, pkgs, lib, ... }: # readTree options
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}: # readTree options
 { config, ... }: # passed by module system
 
 let
-  srvos =
-    import (builtins.fetchTarball {
+  srvos = import (
+    builtins.fetchTarball {
       url = "https://github.com/nix-community/srvos/archive/8e7d3c690975ee6790926bdfd1258016c967d163.tar.gz";
       sha256 = "sha256-l7epHqAcg8Qktu8vO2ZfjSH1wcai01XQOKQA9ADHIk4=";
-    });
-  disko =
-    (builtins.fetchTarball {
+    }
+  );
+  disko = (
+    builtins.fetchTarball {
       url = "https://github.com/nix-community/disko/archive/84dd8eea9a06006d42b8af7cfd4fda4cf334db81.tar.gz";
       sha256 = "13mfnjnjp21wms4mw35ar019775qgy3fnjc59zrpnqbkfmzyvv02";
-    });
-
+    }
+  );
 
 in
 {
@@ -38,7 +44,6 @@ in
       forceSSL = true;
     };
 
-
     security.acme.acceptTerms = true;
     security.acme.defaults.email = "admin+acme@numtide.com";
 
@@ -48,11 +53,9 @@ in
 
     systemd.network.networks."10-uplink".networkConfig.Address = "2a01:4f9:3071:1091::2/64";
 
-
     # Enable SSH and add some keys
     services.openssh.enable = true;
 
-
     users.users.root.openssh.authorizedKeys.keys =
       depot.ops.users.edef
       ++ depot.ops.users.flokli

ops/machines/snix-cache/monitoring.nix

@@ -174,7 +174,8 @@ in
     };
   };
 
-  systemd.services.grafana.serviceConfig.LoadCredential = "github_auth_client_secret:/etc/secrets/grafana_github_auth_client_secret";
+  systemd.services.grafana.serviceConfig.LoadCredential =
+    "github_auth_client_secret:/etc/secrets/grafana_github_auth_client_secret";
   systemd.services.grafana.serviceConfig.RuntimeDirectory = "grafana";
   systemd.services.grafana.serviceConfig.SupplementaryGroups = "nginx";
 

ops/machines/snix-cache/nar-bridge-module.nix

@@ -1,9 +1,10 @@
-{ config
-, lib
-, utils
-, pkgs
-, depot
-, ...
+{
+  config,
+  lib,
+  utils,
+  pkgs,
+  depot,
+  ...
 }:
 let
   cfg = config.services.nar-bridge;

ops/machines/snix-cache/nar-bridge.nix

@@ -9,13 +9,15 @@
     virtualHosts.${config.machine.domain} = {
       locations."=/" = {
         tryFiles = "$uri $uri/index.html =404";
-        root = pkgs.runCommand "index"
-          {
-            nativeBuildInputs = [ pkgs.markdown2html-converter ];
-          } ''
-          mkdir -p $out
-          markdown2html-converter ${./README.md} -o $out/index.html
-        '';
+        root =
+          pkgs.runCommand "index"
+            {
+              nativeBuildInputs = [ pkgs.markdown2html-converter ];
+            }
+            ''
+              mkdir -p $out
+              markdown2html-converter ${./README.md} -o $out/index.html
+            '';
       };
       locations."/" = {
         proxyPass = "http://unix:/run/nar-bridge.sock:/";

ops/modules/forgejo.nix

@@ -3,10 +3,21 @@
 # Thanks to all the Lix core developers for this!
 # vim: et:ts=2:sw=2:
 #
-{ depot, pkgs, lib, config, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  config,
+  ...
+}:
 let
   cfg = config.services.depot.forgejo;
-  inherit (lib) types mkEnableOption mkOption mkIf;
+  inherit (lib)
+    types
+    mkEnableOption
+    mkOption
+    mkIf
+    ;
   emojo =
     let
       drgn = pkgs.fetchzip {
@@ -39,7 +50,15 @@ let
         '';
       };
     in
-    pkgs.symlinkJoin { name = "emojo"; paths = [ drgn neocat neofox dragn ]; };
+    pkgs.symlinkJoin {
+      name = "emojo";
+      paths = [
+        drgn
+        neocat
+        neofox
+        dragn
+      ];
+    };
 in
 {
   options.services.depot.forgejo = {
@@ -77,13 +96,15 @@ in
       enable = true;
 
       package = pkgs.forgejo.overrideAttrs (old: {
-        patches = old.patches ++ (with depot.third_party.lix_forgejo.patches; [
-          upstream_link
-          signin_redirect
-          api_dont_notify
-          forgejo_is_now_gerrit_native
-          forgejo_knows_about_gerrit
-        ]);
+        patches =
+          old.patches
+          ++ (with depot.third_party.lix_forgejo.patches; [
+            upstream_link
+            signin_redirect
+            api_dont_notify
+            forgejo_is_now_gerrit_native
+            forgejo_knows_about_gerrit
+          ]);
       });
 
       # General settings.
@@ -294,10 +315,14 @@ in
     services.mysql.enable = lib.mkForce true;
     services.mysql.package = lib.mkForce pkgs.mariadb;
 
-    systemd.tmpfiles.rules = let cfg = config.services.forgejo; in [
-      "d '${cfg.customDir}/public/assets' 0750 ${cfg.user} ${cfg.group} - -"
-      "d '${cfg.customDir}/public/assets/img' 0750 ${cfg.user} ${cfg.group} - -"
-      "L+ '${cfg.customDir}/public/assets/img/emoji' - - - - ${emojo}"
-    ];
+    systemd.tmpfiles.rules =
+      let
+        cfg = config.services.forgejo;
+      in
+      [
+        "d '${cfg.customDir}/public/assets' 0750 ${cfg.user} ${cfg.group} - -"
+        "d '${cfg.customDir}/public/assets/img' 0750 ${cfg.user} ${cfg.group} - -"
+        "L+ '${cfg.customDir}/public/assets/img/emoji' - - - - ${emojo}"
+      ];
   };
 }

ops/modules/gerrit-autosubmit.nix

@@ -1,24 +1,34 @@
 # Configuration for the Gerrit autosubmit bot (//ops/gerrit-autosubmit)
-{ depot, pkgs, config, lib, ... }:
+{
+  depot,
+  pkgs,
+  config,
+  lib,
+  ...
+}:
 
 let
   cfg = config.services.depot.gerrit-autosubmit;
   description = "gerrit-autosubmit - autosubmit bot for Gerrit";
-  mkStringOption = default: lib.mkOption {
-    inherit default;
-    type = lib.types.str;
-  };
+  mkStringOption =
+    default:
+    lib.mkOption {
+      inherit default;
+      type = lib.types.str;
+    };
 in
 {
   options.services.depot.gerrit-autosubmit = {
     enable = lib.mkEnableOption description;
     gerritUrl = mkStringOption "https://cl.snix.dev";
 
-    secretsFile = with lib; mkOption {
-      description = "Path to a systemd EnvironmentFile containing secrets";
-      default = config.age.secretsDir + "/gerrit-autosubmit";
-      type = types.str;
-    };
+    secretsFile =
+      with lib;
+      mkOption {
+        description = "Path to a systemd EnvironmentFile containing secrets";
+        default = config.age.secretsDir + "/gerrit-autosubmit";
+        type = types.str;
+      };
   };
 
   config = lib.mkIf cfg.enable {

ops/modules/gerrit-webhook-to-irccat.nix

@@ -1,4 +1,9 @@
-{ config, depot, lib, ... }:
+{
+  config,
+  depot,
+  lib,
+  ...
+}:
 
 let
   cfg = config.services.depot.gerrit-webhook-to-irccat;
@@ -21,8 +26,9 @@ in
   config = lib.mkIf cfg.enable {
     systemd.services.gerrit-webhook-to-irccat = {
       serviceConfig = {
-        ExecStart = "${depot.ops.gerrit-webhook-to-irccat}/bin/gerrit-webhook-to-irccat" +
-          " -irccat-url ${cfg.irccatUrl}";
+        ExecStart =
+          "${depot.ops.gerrit-webhook-to-irccat}/bin/gerrit-webhook-to-irccat"
+          + " -irccat-url ${cfg.irccatUrl}";
         Restart = "always";
         RestartSec = 5;
         User = "gerrit-webhook-to-irccat";

ops/modules/hetzner-cloud.nix

@@ -1,11 +1,21 @@
-{ config, lib, pkgs, modulesPath, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
 let
   cfg = config.infra.hardware.hetzner-cloud;
-  inherit (lib) types mkOption mkEnableOption mkIf;
+  inherit (lib)
+    types
+    mkOption
+    mkEnableOption
+    mkIf
+    ;
 in
 {
-  imports =
-    [ (modulesPath + "/profiles/qemu-guest.nix") ];
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
 
   options.infra.hardware.hetzner-cloud = {
     enable = mkEnableOption "the Hetzner Cloud hardware profile";
@@ -40,7 +50,10 @@ in
         }
       ];
 
-      dns = [ "2a01:4ff:ff00::add:1" "2a01:4ff:ff00::add:2" ];
+      dns = [
+        "2a01:4ff:ff00::add:1"
+        "2a01:4ff:ff00::add:2"
+      ];
     };
 
     boot.loader.systemd-boot.enable = true;

ops/modules/irccat.nix

@@ -1,4 +1,9 @@
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 let
   cfg = config.services.irccat;
@@ -35,16 +40,18 @@ in
       wants = [ "network.target" ];
 
       serviceConfig = {
-        ExecStartPre = (pkgs.writeShellScript "merge-irccat-config" ''
-          if [ ! -f "$CREDENTIALS_DIRECTORY/secrets" ]; then
-            echo "irccat secrets file is missing"
-            exit 1
-          fi
+        ExecStartPre = (
+          pkgs.writeShellScript "merge-irccat-config" ''
+            if [ ! -f "$CREDENTIALS_DIRECTORY/secrets" ]; then
+              echo "irccat secrets file is missing"
+              exit 1
+            fi
 
-          # jq's * is the recursive merge operator
-          ${pkgs.jq}/bin/jq -s '.[0] * .[1]' ${configJson} "$CREDENTIALS_DIRECTORY/secrets" \
-            > /var/lib/irccat/irccat.json
-        '');
+            # jq's * is the recursive merge operator
+            ${pkgs.jq}/bin/jq -s '.[0] * .[1]' ${configJson} "$CREDENTIALS_DIRECTORY/secrets" \
+              > /var/lib/irccat/irccat.json
+          ''
+        );
 
         ExecStart = "${pkgs.irccat}/bin/irccat";
         DynamicUser = true;
@@ -57,4 +64,3 @@ in
     };
   };
 }
-

ops/modules/known-hosts.nix

@@ -4,12 +4,18 @@
 {
   programs.ssh.knownHosts = {
     public01 = {
-      hostNames = [ "public01.infra.snix.dev" "git.snix.dev" ];
+      hostNames = [
+        "public01.infra.snix.dev"
+        "git.snix.dev"
+      ];
       publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICzB7bqXWcv+sVokySvj1d74zRlVLSNqBw7/OY3c7QYd";
     };
 
     gerrit01 = {
-      hostNames = [ "gerrit01.infra.snix.dev" "cl.snix.dev" ];
+      hostNames = [
+        "gerrit01.infra.snix.dev"
+        "cl.snix.dev"
+      ];
       publicKey = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIN+RCLAExaM5EC70UsCPMtDT1Cfa80Ux/vex95fLk9S4";
     };
 

ops/modules/monorepo-gerrit.nix

@@ -1,5 +1,11 @@
 # Gerrit configuration for the snix monorepo
-{ depot, pkgs, config, lib, ... }:
+{
+  depot,
+  pkgs,
+  config,
+  lib,
+  ...
+}:
 
 let
   cfg = config.services.gerrit;
@@ -7,10 +13,12 @@ let
   gerritPackage = depot.third_party.nix-gerrit.gerrit_3_12;
   gerritPlugins = depot.third_party.nix-gerrit.plugins_3_12;
 
-  besadiiWithConfig = name: pkgs.writeShellScript "besadii-gerrit01" ''
-    export BESADII_CONFIG=/run/agenix/gerrit-besadii-config
-    exec -a ${name} ${depot.ops.besadii}/bin/besadii "$@"
-  '';
+  besadiiWithConfig =
+    name:
+    pkgs.writeShellScript "besadii-gerrit01" ''
+      export BESADII_CONFIG=/run/agenix/gerrit-besadii-config
+      exec -a ${name} ${depot.ops.besadii}/bin/besadii "$@"
+    '';
 
   gerritHooks = pkgs.runCommand "gerrit-hooks" { } ''
     mkdir -p $out

ops/modules/o11y/alertmanager-irc-relay.nix

@@ -1,4 +1,5 @@
-{ config, depot, ... }: {
+{ config, depot, ... }:
+{
   imports = [
     depot.third_party.alertmanager-irc-relay.module
   ];
@@ -10,7 +11,10 @@
       irc_port = 6697;
       irc_nickname = "silentfox";
       irc_channels = [
-        { name = "#snix"; password = "$CHANNEL_PASSWORD"; }
+        {
+          name = "#snix";
+          password = "$CHANNEL_PASSWORD";
+        }
       ];
     };
     environmentFiles = [

ops/modules/o11y/alloy.nix

@@ -1,15 +1,25 @@
-{ depot
-, config
-, lib
-, ...
+{
+  depot,
+  config,
+  lib,
+  ...
 }:
 let
   cfg = config.infra.monitoring.alloy;
-  inherit (lib) mkEnableOption mkOption mkIf types mapAttrs' nameValuePair;
+  inherit (lib)
+    mkEnableOption
+    mkOption
+    mkIf
+    types
+    mapAttrs'
+    nameValuePair
+    ;
 in
 {
   options.infra.monitoring.alloy = {
-    enable = (mkEnableOption "Grafana Alloy") // { default = true; };
+    enable = (mkEnableOption "Grafana Alloy") // {
+      default = true;
+    };
 
     exporters = mkOption {
       description = ''
@@ -19,12 +29,17 @@ in
         internally, which ends up exported as `job` label
         on all metrics of that exporter.
       '';
-      type = types.attrsOf (types.submodule ({ config, name, ... }: {
-        options.port = mkOption {
-          description = "Exporter port";
-          type = types.int;
-        };
-      }));
+      type = types.attrsOf (
+        types.submodule (
+          { config, name, ... }:
+          {
+            options.port = mkOption {
+              description = "Exporter port";
+              type = types.int;
+            };
+          }
+        )
+      );
       default = { };
     };
   };
@@ -70,8 +85,10 @@ in
           }
         }
       '';
-    } // (mapAttrs'
-      (name: v: nameValuePair "alloy/scrape_${name}.alloy" {
+    }
+    // (mapAttrs' (
+      name: v:
+      nameValuePair "alloy/scrape_${name}.alloy" {
         text = ''
           prometheus.scrape "${name}" {
             targets = [
@@ -80,8 +97,8 @@ in
             forward_to = [prometheus.remote_write.mimir.receiver]
           }
         '';
-      })
-      cfg.exporters);
+      }
+    ) cfg.exporters);
 
     systemd.services.alloy.serviceConfig = {
       LoadCredential = [

ops/modules/o11y/grafana.nix

@@ -1,7 +1,8 @@
-{ depot
-, config
-, lib
-, ...
+{
+  depot,
+  config,
+  lib,
+  ...
 }:
 let
   cfg = config.services.depot.grafana;

ops/modules/o11y/loki.nix

@@ -1,6 +1,7 @@
-{ config
-, lib
-, ...
+{
+  config,
+  lib,
+  ...
 }:
 let
   cfg = config.services.depot.loki;
@@ -38,7 +39,10 @@ in
           ring = {
             kvstore.store = "memberlist";
             # TODO: Such a ugly hack.
-            instance_interface_names = [ "enp1s0" "lo" ];
+            instance_interface_names = [
+              "enp1s0"
+              "lo"
+            ];
           };
           replication_factor = 1;
         };

ops/modules/o11y/mimir.nix

@@ -1,7 +1,8 @@
-{ config
-, lib
-, pkgs
-, ...
+{
+  config,
+  lib,
+  pkgs,
+  ...
 }:
 let
   cfg = config.services.depot.prometheus;
@@ -9,15 +10,17 @@ let
 
   mimirPort = config.services.mimir.configuration.server.http_listen_port;
 
-  alerts = pkgs.runCommand "mimir-alerts-checked"
-    {
-      src = ./alerts;
-      nativeBuildInputs = with pkgs; [ prometheus.cli ];
-    } ''
-    promtool check rules $src/*
-    mkdir $out
-    cp -R $src $out/anonymous/
-  '';
+  alerts =
+    pkgs.runCommand "mimir-alerts-checked"
+      {
+        src = ./alerts;
+        nativeBuildInputs = with pkgs; [ prometheus.cli ];
+      }
+      ''
+        promtool check rules $src/*
+        mkdir $out
+        cp -R $src $out/anonymous/
+      '';
 in
 {
   options.services.depot.prometheus.enable = mkEnableOption "Prometheus scraper";
@@ -42,13 +45,34 @@ in
         };
 
         # TODO: Such a ugly hack.
-        distributor.ring.instance_interface_names = [ "enp1s0" "lo" ];
-        ingester.ring.instance_interface_names = [ "enp1s0" "lo" ];
-        frontend.instance_interface_names = [ "enp1s0" "lo" ];
-        query_scheduler.ring.instance_interface_names = [ "enp1s0" "lo" ];
-        ruler.ring.instance_interface_names = [ "enp1s0" "lo" ];
-        compactor.sharding_ring.instance_interface_names = [ "enp1s0" "lo" ];
-        store_gateway.sharding_ring.instance_interface_names = [ "enp1s0" "lo" ];
+        distributor.ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        ingester.ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        frontend.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        query_scheduler.ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        ruler.ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        compactor.sharding_ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
+        store_gateway.sharding_ring.instance_interface_names = [
+          "enp1s0"
+          "lo"
+        ];
 
         memberlist = {
           advertise_addr = "127.0.0.1";
@@ -91,11 +115,13 @@ in
             receivers = [
               {
                 name = "irc";
-                webhook_configs = [{
-                  # Mimir can't expand environment variables in external config files,
-                  # so work around it.
-                  url_file = "/run/credentials/mimir.service/webhook-url";
-                }];
+                webhook_configs = [
+                  {
+                    # Mimir can't expand environment variables in external config files,
+                    # so work around it.
+                    url_file = "/run/credentials/mimir.service/webhook-url";
+                  }
+                ];
               }
             ];
           };

ops/modules/o11y/tempo.nix

@@ -1,6 +1,7 @@
-{ config
-, lib
-, ...
+{
+  config,
+  lib,
+  ...
 }:
 let
   cfg = config.services.depot.tempo;
@@ -48,11 +49,14 @@ in
       };
     };
 
-    systemd.services.tempo.serviceConfig.EnvironmentFile = [ config.age.secrets.tempo-environment.path ];
+    systemd.services.tempo.serviceConfig.EnvironmentFile = [
+      config.age.secrets.tempo-environment.path
+    ];
 
     services.nginx = {
       upstreams.tempo = {
-        servers."${config.services.tempo.settings.distributor.receivers.otlp.protocols.http.endpoint}" = { };
+        servers."${config.services.tempo.settings.distributor.receivers.otlp.protocols.http.endpoint}" =
+          { };
         extraConfig = "keepalive 16;";
       };
 

ops/modules/restic.nix

@@ -5,14 +5,21 @@
 # - restic's cache lives in /var/backup/restic/cache
 # - repository password lives in `config.age.secrets.restic-repository-password.path`
 # - object storage credentials in `config.age.secrets.restic-bucket-credentials.path`
-{ config, lib, pkgs, ... }:
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
 
 let
   cfg = config.services.depot.restic;
-  mkStringOption = default: lib.mkOption {
-    inherit default;
-    type = lib.types.str;
-  };
+  mkStringOption =
+    default:
+    lib.mkOption {
+      inherit default;
+      type = lib.types.str;
+    };
 in
 {
   options.services.depot.restic = {
@@ -23,16 +30,20 @@ in
     repository = mkStringOption config.networking.hostName;
     interval = mkStringOption "hourly";
 
-    paths = with lib; mkOption {
-      description = "Directories that should be backed up";
-      type = types.listOf types.str;
-    };
+    paths =
+      with lib;
+      mkOption {
+        description = "Directories that should be backed up";
+        type = types.listOf types.str;
+      };
 
-    exclude = with lib; mkOption {
-      description = "Files that should be excluded from backups";
-      type = types.listOf types.str;
-      default = [ ];
-    };
+    exclude =
+      with lib;
+      mkOption {
+        description = "Files that should be excluded from backups";
+        type = types.listOf types.str;
+        default = [ ];
+      };
   };
 
   config = lib.mkIf cfg.enable {
@@ -51,8 +62,7 @@ in
         RESTIC_PASSWORD_FILE = config.age.secrets.restic-repository-password.path;
         RESTIC_CACHE_DIR = "/var/backup/restic/cache";
 
-        RESTIC_EXCLUDE_FILE =
-          builtins.toFile "exclude-files" (lib.concatStringsSep "\n" cfg.exclude);
+        RESTIC_EXCLUDE_FILE = builtins.toFile "exclude-files" (lib.concatStringsSep "\n" cfg.exclude);
       };
     };
 

ops/modules/snix-buildkite.nix

@@ -1,9 +1,10 @@
 # Configuration for the snix buildkite agents.
-{ config
-, depot
-, pkgs
-, lib
-, ...
+{
+  config,
+  depot,
+  pkgs,
+  lib,
+  ...
 }:
 
 let
@@ -50,61 +51,56 @@ in
   config = lib.mkIf cfg.enable {
     # Run the Buildkite agents using the default upstream module.
     services.buildkite-agents = builtins.listToAttrs (
-      map
-        (n: rec {
-          name = "${hostname}-${toString n}";
-          value =
-            {
-              inherit name;
-              enable = true;
-              tokenPath = config.age.secretsDir + "/buildkite-agent-token";
-              privateSshKeyPath = config.age.secretsDir + "/buildkite-private-key";
-              hooks.post-command = "${buildkiteHooks}/bin/post-command";
-              tags.queue = "default";
-              hooks.environment = ''
-                export PATH=$PATH:/run/wrappers/bin
-              '';
+      map (n: rec {
+        name = "${hostname}-${toString n}";
+        value = {
+          inherit name;
+          enable = true;
+          tokenPath = config.age.secretsDir + "/buildkite-agent-token";
+          privateSshKeyPath = config.age.secretsDir + "/buildkite-private-key";
+          hooks.post-command = "${buildkiteHooks}/bin/post-command";
+          tags.queue = "default";
+          hooks.environment = ''
+            export PATH=$PATH:/run/wrappers/bin
+          '';
 
-              tags = {
-                # all agents support small jobs
-                small = "true";
-                inherit hostname;
-                large = if n <= cfg.largeSlots then "true" else "false";
-              };
+          tags = {
+            # all agents support small jobs
+            small = "true";
+            inherit hostname;
+            large = if n <= cfg.largeSlots then "true" else "false";
+          };
 
-              runtimePackages = with pkgs; [
-                bash
-                coreutils
-                credentialHelper
-                curl
-                git
-                gnutar
-                gzip
-                jq
-                nix
-              ];
-            };
-        })
-        agents
+          runtimePackages = with pkgs; [
+            bash
+            coreutils
+            credentialHelper
+            curl
+            git
+            gnutar
+            gzip
+            jq
+            nix
+          ];
+        };
+      }) agents
     );
 
     # Set up a group for all Buildkite agent users
     users = {
       groups.buildkite-agents = { };
       users = builtins.listToAttrs (
-        map
-          (n: rec {
-            name = "buildkite-agent-${hostname}-${toString n}";
-            value = {
-              isSystemUser = true;
-              group = lib.mkForce "buildkite-agents";
-              extraGroups = [
-                name
-                "docker"
-              ];
-            };
-          })
-          agents
+        map (n: rec {
+          name = "buildkite-agent-${hostname}-${toString n}";
+          value = {
+            isSystemUser = true;
+            group = lib.mkForce "buildkite-agents";
+            extraGroups = [
+              name
+              "docker"
+            ];
+          };
+        }) agents
       );
     };
   };

ops/modules/www/base.nix

@@ -2,7 +2,10 @@
 
 {
   config = {
-    networking.firewall.allowedTCPPorts = [ 80 443 ];
+    networking.firewall.allowedTCPPorts = [
+      80
+      443
+    ];
 
     security.acme = {
       acceptTerms = true;

ops/modules/www/tempo.snix.dev.nix

@@ -6,7 +6,8 @@
 
   services.nginx = {
     upstreams.tempo = {
-      servers."${config.services.tempo.settings.distributor.receivers.otlp.protocols.http.endpoint}" = { };
+      servers."${config.services.tempo.settings.distributor.receivers.otlp.protocols.http.endpoint}" =
+        { };
     };
 
     virtualHosts."tempo.snix.dev" = {

ops/nixos.nix

@@ -1,42 +1,56 @@
 # Helper functions for instantiating depot-compatible NixOS machines.
-{ depot, lib, pkgs, ... }@args:
+{
+  depot,
+  lib,
+  pkgs,
+  ...
+}@args:
 
-let inherit (lib) findFirst;
-in rec {
+let
+  inherit (lib) findFirst;
+in
+rec {
   # This provides our standard set of arguments to all NixOS modules.
-  baseModule = { ... }: {
-    nix.nixPath =
-      let
-        # Due to nixpkgsBisectPath, pkgs.path is not always in the nix store
-        nixpkgsStorePath =
-          if lib.hasPrefix builtins.storeDir (toString pkgs.path)
-          then builtins.storePath pkgs.path # nixpkgs is already in the store
-          else pkgs.path; # we need to dump nixpkgs to the store either way
-      in
-      [
-        ("nixos=" + nixpkgsStorePath)
-        ("nixpkgs=" + nixpkgsStorePath)
-      ];
-  };
-
-  nixosFor = configuration: (depot.third_party.nixos {
-    configuration = { ... }: {
-      imports = [
-        baseModule
-        configuration
-      ];
+  baseModule =
+    { ... }:
+    {
+      nix.nixPath =
+        let
+          # Due to nixpkgsBisectPath, pkgs.path is not always in the nix store
+          nixpkgsStorePath =
+            if lib.hasPrefix builtins.storeDir (toString pkgs.path) then
+              builtins.storePath pkgs.path # nixpkgs is already in the store
+            else
+              pkgs.path; # we need to dump nixpkgs to the store either way
+        in
+        [
+          ("nixos=" + nixpkgsStorePath)
+          ("nixpkgs=" + nixpkgsStorePath)
+        ];
     };
 
-    specialArgs = {
-      inherit (args) depot;
-    };
-  });
+  nixosFor =
+    configuration:
+    (depot.third_party.nixos {
+      configuration =
+        { ... }:
+        {
+          imports = [
+            baseModule
+            configuration
+          ];
+        };
 
-  findSystem = hostname:
-    (findFirst
-      (system: system.config.networking.hostName == hostname)
-      (throw "${hostname} is not a known NixOS host")
-      (map nixosFor depot.ops.machines.all-systems));
+      specialArgs = {
+        inherit (args) depot;
+      };
+    });
+
+  findSystem =
+    hostname:
+    (findFirst (
+      system: system.config.networking.hostName == hostname
+    ) (throw "${hostname} is not a known NixOS host") (map nixosFor depot.ops.machines.all-systems));
 
   # Systems that should be built in CI
   archivistEC2System = nixosFor depot.ops.machines.archivist-ec2;

ops/pipelines/depot.nix

@@ -1,6 +1,11 @@
 # This file configures the primary build pipeline used for the
 # top-level list of depot targets.
-{ depot, pkgs, externalArgs, ... }:
+{
+  depot,
+  pkgs,
+  externalArgs,
+  ...
+}:
 
 let
   pipeline = depot.nix.buildkite.mkPipeline {
@@ -8,9 +13,10 @@ let
     drvTargets = depot.ci.targets;
 
     parentTargetMap =
-      if (externalArgs ? parentTargetMap)
-      then builtins.fromJSON (builtins.readFile externalArgs.parentTargetMap)
-      else { };
+      if (externalArgs ? parentTargetMap) then
+        builtins.fromJSON (builtins.readFile externalArgs.parentTargetMap)
+      else
+        { };
 
     postBuildSteps = [
       # After successful builds, create a gcroot for builds on canon.

ops/secrets/default.nix

@@ -1,3 +1,5 @@
 args:
-let mkSecrets = import ./mkSecrets.nix args; in
+let
+  mkSecrets = import ./mkSecrets.nix args;
+in
 mkSecrets ./. (import ./secrets.nix) // { inherit mkSecrets; }

ops/secrets/mkSecrets.nix

@@ -12,10 +12,12 @@ let
   agePubkey = types.typedef "age pubkey" (s: isString s && hasPrefix "age" s);
 
   agenixSecret = types.struct "agenixSecret" {
-    publicKeys = types.listOf (types.union [
-      sshPubkey
-      agePubkey
-    ]);
+    publicKeys = types.listOf (
+      types.union [
+        sshPubkey
+        agePubkey
+      ]
+    );
   };
 
 in

ops/secrets/secrets.nix

@@ -20,13 +20,21 @@ let
 
   superadmins = raito ++ edef ++ flokli;
 
-  allDefault.publicKeys = superadmins ++ [ gerrit01 public01 build01 meta01 ];
+  allDefault.publicKeys = superadmins ++ [
+    gerrit01
+    public01
+    build01
+    meta01
+  ];
   terraform.publicKeys = superadmins;
   gerrit01Default.publicKeys = superadmins ++ [ gerrit01 ];
   public01Default.publicKeys = superadmins ++ [ public01 ];
   build01Default.publicKeys = superadmins ++ [ build01 ];
   meta01Default.publicKeys = superadmins ++ [ meta01 ];
-  ciDefault.publicKeys = superadmins ++ [ gerrit01 build01 ];
+  ciDefault.publicKeys = superadmins ++ [
+    gerrit01
+    build01
+  ];
 in
 {
   "grafana-agent-password.age" = allDefault;

ops/users/default.nix

@@ -1,4 +1,5 @@
-{ ... }: {
+{ ... }:
+{
   flokli = [
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPTVTXOutUZZjXLB0lUSgeKcSY/8mxKkC0ingGK1whD2 flokli"
     "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE6a15p9HLSrawsMTd2UQGAiM7r7VdyrfSRyzwRYTgWT flokli@m2air"

snix/boot/default.nix

@@ -16,22 +16,25 @@ rec {
   # A kernel with virtiofs support baked in
   # TODO: make a smaller kernel, we don't need a gazillion filesystems and
   # device drivers in it.
-  kernel = pkgs.buildLinux ({ } // {
-    inherit (pkgs.linuxPackages_latest.kernel) src version modDirVersion;
-    autoModules = false;
-    kernelPreferBuiltin = true;
-    ignoreConfigErrors = true;
-    kernelPatches = [ ];
-    structuredExtraConfig = with pkgs.lib.kernel; {
-      FUSE_FS = option yes;
-      DAX_DRIVER = option yes;
-      DAX = option yes;
-      FS_DAX = option yes;
-      VIRTIO_FS = option yes;
-      VIRTIO = option yes;
-      ZONE_DEVICE = option yes;
-    };
-  });
+  kernel = pkgs.buildLinux (
+    { }
+    // {
+      inherit (pkgs.linuxPackages_latest.kernel) src version modDirVersion;
+      autoModules = false;
+      kernelPreferBuiltin = true;
+      ignoreConfigErrors = true;
+      kernelPatches = [ ];
+      structuredExtraConfig = with pkgs.lib.kernel; {
+        FUSE_FS = option yes;
+        DAX_DRIVER = option yes;
+        DAX = option yes;
+        FS_DAX = option yes;
+        VIRTIO_FS = option yes;
+        VIRTIO = option yes;
+        ZONE_DEVICE = option yes;
+      };
+    }
+  );
 
   # A build framework for minimal initrds
   uroot = pkgs.buildGoModule rec {

snix/boot/tests/default.nix

@@ -1,4 +1,9 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 let
   # Seed a snix-store with the specified path, then start a VM with the
@@ -6,46 +11,48 @@ let
   # Allows customizing the cmdline, which can be used to list files,
   # or specify what init should be booted.
   mkBootTest =
-    { blobServiceAddr ? "memory://"
-    , directoryServiceAddr ? "memory://"
-    , pathInfoServiceAddr ? "memory://"
-
+    {
+      blobServiceAddr ? "memory://",
+      directoryServiceAddr ? "memory://",
+      pathInfoServiceAddr ? "memory://",
 
       # The path to import.
-    , path
+      path,
 
       # Whether the path should be imported as a closure.
       # If false, importPathName must be specified.
-    , isClosure ? false
+      isClosure ? false,
       # Whether to use nar-bridge to upload, rather than snix-store copy.
       # using nar-bridge currently is "slower", as the `pkgs.mkBinaryCache` build
       # takes quite some time.
-    , useNarBridge ? false
+      useNarBridge ? false,
 
-    , importPathName ? null
+      importPathName ? null,
 
       # Commands to run before starting the snix-daemon. Useful to provide
       # auxillary mock services.
-    , preStart ? ""
+      preStart ? "",
 
       # The cmdline to pass to the VM.
       # Defaults to snix.find, which lists all files in the store.
-    , vmCmdline ? "snix.find"
+      vmCmdline ? "snix.find",
       # The string we expect to find in the VM output.
       # Defaults the value of `path` (the store path we upload).
-    , assertVMOutput ? path
+      assertVMOutput ? path,
     }:
 
-      assert isClosure -> importPathName == null;
-      assert (!isClosure) -> importPathName != null;
+    assert isClosure -> importPathName == null;
+    assert (!isClosure) -> importPathName != null;
 
-      pkgs.stdenv.mkDerivation ({
+    pkgs.stdenv.mkDerivation (
+      {
         name = "run-vm";
 
         nativeBuildInputs = [
           depot.snix.store
           depot.snix.boot.runVM
-        ] ++ lib.optionals (isClosure && useNarBridge) [
+        ]
+        ++ lib.optionals (isClosure && useNarBridge) [
           depot.snix.nar-bridge
           pkgs.curl
           pkgs.rush-parallel
@@ -76,17 +83,20 @@ let
           export BLOB_SERVICE_ADDR=grpc+unix://$PWD/snix-store.sock
           export DIRECTORY_SERVICE_ADDR=grpc+unix://$PWD/snix-store.sock
           export PATH_INFO_SERVICE_ADDR=grpc+unix://$PWD/snix-store.sock
-        '' + lib.optionalString (!isClosure) ''
+        ''
+        + lib.optionalString (!isClosure) ''
           echo "Importing ${path} into snix-store with name ${importPathName}…"
           cp -R ${path} ${importPathName}
           outpath=$(snix-store import ${importPathName})
 
           echo "imported to $outpath"
-        '' + lib.optionalString (isClosure && !useNarBridge) ''
+        ''
+        + lib.optionalString (isClosure && !useNarBridge) ''
           echo "Copying closure ${path}…"
           # This picks up the `closure` key in `$NIX_ATTRS_JSON_FILE` automatically.
           snix-store --otlp=false copy
-        '' + lib.optionalString (isClosure && useNarBridge) ''
+        ''
+        + lib.optionalString (isClosure && useNarBridge) ''
           echo "Starting nar-bridge…"
           nar-bridge \
             --otlp=false \
@@ -122,7 +132,8 @@ let
           # In the future, we might want to make this behaviour configurable,
           # and disable checking here, to keep the logic simple.
           ls -d $to_upload/*.narinfo | rush 'curl -s -T - --unix-socket $PWD/nar-bridge.sock http://localhost:9000/$(basename {}) < {}'
-        '' + ''
+        ''
+        + ''
           # Invoke a VM using snix as the backing store, ensure the outpath appears in its listing.
           echo "Starting VM…"
 
@@ -138,113 +149,130 @@ let
         meta.ci.buildkiteExtraStepArgs = {
           retry.automatic = true;
         };
-      } // lib.optionalAttrs (isClosure && !useNarBridge) {
+      }
+      // lib.optionalAttrs (isClosure && !useNarBridge) {
         __structuredAttrs = true;
         exportReferencesGraph.closure = [ path ];
-      });
+      }
+    );
 
-  testSystem = (pkgs.nixos {
-    # Set some options necessary to evaluate.
-    boot.loader.systemd-boot.enable = true;
-    # TODO: figure out how to disable this without causing eval to fail
-    fileSystems."/" = {
-      device = "/dev/root";
-      fsType = "tmpfs";
-    };
+  testSystem =
+    (pkgs.nixos {
+      # Set some options necessary to evaluate.
+      boot.loader.systemd-boot.enable = true;
+      # TODO: figure out how to disable this without causing eval to fail
+      fileSystems."/" = {
+        device = "/dev/root";
+        fsType = "tmpfs";
+      };
 
-    services.getty.helpLine = "Onwards and upwards.";
-    systemd.services.do-shutdown = {
-      after = [ "getty.target" ];
-      description = "Shut down again";
-      wantedBy = [ "multi-user.target" ];
-      serviceConfig.Type = "oneshot";
-      script = "/run/current-system/sw/bin/systemctl poweroff --when=+10s";
-    };
+      services.getty.helpLine = "Onwards and upwards.";
+      systemd.services.do-shutdown = {
+        after = [ "getty.target" ];
+        description = "Shut down again";
+        wantedBy = [ "multi-user.target" ];
+        serviceConfig.Type = "oneshot";
+        script = "/run/current-system/sw/bin/systemctl poweroff --when=+10s";
+      };
 
-    # Don't warn about stateVersion.
-    system.stateVersion = "24.05";
+      # Don't warn about stateVersion.
+      system.stateVersion = "24.05";
 
-    # Speed-up evaluation and building.
-    documentation.enable = lib.mkForce false;
-  }).config.system.build.toplevel;
+      # Speed-up evaluation and building.
+      documentation.enable = lib.mkForce false;
+    }).config.system.build.toplevel;
 
 in
 depot.nix.readTree.drvTargets {
-  docs-memory = (mkBootTest {
-    path = ../../docs;
-    importPathName = "docs";
-  });
-  docs-persistent = (mkBootTest {
-    blobServiceAddr = "objectstore+file:///build/blobs";
-    directoryServiceAddr = "redb:///build/directories.redb";
-    pathInfoServiceAddr = "redb:///build/pathinfo.redb";
-    path = ../../docs;
-    importPathName = "docs";
-  });
+  docs-memory = (
+    mkBootTest {
+      path = ../../docs;
+      importPathName = "docs";
+    }
+  );
+  docs-persistent = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+file:///build/blobs";
+      directoryServiceAddr = "redb:///build/directories.redb";
+      pathInfoServiceAddr = "redb:///build/pathinfo.redb";
+      path = ../../docs;
+      importPathName = "docs";
+    }
+  );
 
-  closure-snix = (mkBootTest {
-    blobServiceAddr = "objectstore+file:///build/blobs";
-    path = depot.snix.store;
-    isClosure = true;
-  });
+  closure-snix = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+file:///build/blobs";
+      path = depot.snix.store;
+      isClosure = true;
+    }
+  );
 
-  closure-nixos = (mkBootTest {
-    blobServiceAddr = "objectstore+file:///build/blobs";
-    pathInfoServiceAddr = "redb:///build/pathinfo.redb";
-    directoryServiceAddr = "redb:///build/directories.redb";
-    path = testSystem;
-    isClosure = true;
-    vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
-    assertVMOutput = "Onwards and upwards.";
-  });
+  closure-nixos = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+file:///build/blobs";
+      pathInfoServiceAddr = "redb:///build/pathinfo.redb";
+      directoryServiceAddr = "redb:///build/directories.redb";
+      path = testSystem;
+      isClosure = true;
+      vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
+      assertVMOutput = "Onwards and upwards.";
+    }
+  );
 
-  closure-nixos-bigtable = (mkBootTest {
-    blobServiceAddr = "objectstore+file:///build/blobs";
-    directoryServiceAddr = "bigtable://instance-1?project_id=project-1&table_name=directories&family_name=cf1";
-    pathInfoServiceAddr = "bigtable://instance-1?project_id=project-1&table_name=pathinfos&family_name=cf1";
-    path = testSystem;
-    useNarBridge = true;
-    preStart = ''
-      ${pkgs.cbtemulator}/bin/cbtemulator -address $PWD/cbtemulator.sock &
-      timeout 22 sh -c 'until [ -e $PWD/cbtemulator.sock ]; do sleep 1; done'
+  closure-nixos-bigtable = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+file:///build/blobs";
+      directoryServiceAddr = "bigtable://instance-1?project_id=project-1&table_name=directories&family_name=cf1";
+      pathInfoServiceAddr = "bigtable://instance-1?project_id=project-1&table_name=pathinfos&family_name=cf1";
+      path = testSystem;
+      useNarBridge = true;
+      preStart = ''
+        ${pkgs.cbtemulator}/bin/cbtemulator -address $PWD/cbtemulator.sock &
+        timeout 22 sh -c 'until [ -e $PWD/cbtemulator.sock ]; do sleep 1; done'
 
-      export BIGTABLE_EMULATOR_HOST=unix://$PWD/cbtemulator.sock
-      ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createtable directories
-      ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createfamily directories cf1
-      ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createtable pathinfos
-      ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createfamily pathinfos cf1
-    '';
-    isClosure = true;
-    vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
-    assertVMOutput = "Onwards and upwards.";
-  });
+        export BIGTABLE_EMULATOR_HOST=unix://$PWD/cbtemulator.sock
+        ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createtable directories
+        ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createfamily directories cf1
+        ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createtable pathinfos
+        ${pkgs.google-cloud-bigtable-tool}/bin/cbt -instance instance-1 -project project-1 createfamily pathinfos cf1
+      '';
+      isClosure = true;
+      vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
+      assertVMOutput = "Onwards and upwards.";
+    }
+  );
 
-  closure-nixos-s3 = (mkBootTest {
-    blobServiceAddr = "objectstore+s3://mybucket/blobs?aws_access_key_id=myaccesskey&aws_secret_access_key=supersecret&aws_endpoint_url=http%3A%2F%2Flocalhost%3A9000&aws_allow_http=1";
-    # we cannot use s3 here yet without any caching layer, as we don't allow "deeper" access to directories (non-root nodes)
-    # directoryServiceAddr = "objectstore+s3://mybucket/directories?aws_access_key_id=myaccesskey&aws_secret_access_key=supersecret&endpoint=http%3A%2F%2Flocalhost%3A9000&aws_allow_http=1";
-    directoryServiceAddr = "memory://";
-    pathInfoServiceAddr = "memory://";
-    path = testSystem;
-    useNarBridge = true;
-    preStart = ''
-      MINIO_ACCESS_KEY=myaccesskey MINIO_SECRET_KEY=supersecret MINIO_ADDRESS=127.0.0.1:9000 ${pkgs.minio}/bin/minio server $(mktemp -d) &
-      timeout 22 sh -c 'until ${pkgs.netcat}/bin/nc -z $0 $1; do sleep 1; done' localhost 9000
-      mc_config_dir=$(mktemp -d)
-      ${pkgs.minio-client}/bin/mc --config-dir $mc_config_dir alias set 'myminio' 'http://127.0.0.1:9000' 'myaccesskey' 'supersecret'
-      ${pkgs.minio-client}/bin/mc --config-dir $mc_config_dir mb myminio/mybucket
-    '';
-    isClosure = true;
-    vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
-    assertVMOutput = "Onwards and upwards.";
-  });
+  closure-nixos-s3 = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+s3://mybucket/blobs?aws_access_key_id=myaccesskey&aws_secret_access_key=supersecret&aws_endpoint_url=http%3A%2F%2Flocalhost%3A9000&aws_allow_http=1";
+      # we cannot use s3 here yet without any caching layer, as we don't allow "deeper" access to directories (non-root nodes)
+      # directoryServiceAddr = "objectstore+s3://mybucket/directories?aws_access_key_id=myaccesskey&aws_secret_access_key=supersecret&endpoint=http%3A%2F%2Flocalhost%3A9000&aws_allow_http=1";
+      directoryServiceAddr = "memory://";
+      pathInfoServiceAddr = "memory://";
+      path = testSystem;
+      useNarBridge = true;
+      preStart = ''
+        MINIO_ACCESS_KEY=myaccesskey MINIO_SECRET_KEY=supersecret MINIO_ADDRESS=127.0.0.1:9000 ${pkgs.minio}/bin/minio server $(mktemp -d) &
+        timeout 22 sh -c 'until ${pkgs.netcat}/bin/nc -z $0 $1; do sleep 1; done' localhost 9000
+        mc_config_dir=$(mktemp -d)
+        ${pkgs.minio-client}/bin/mc --config-dir $mc_config_dir alias set 'myminio' 'http://127.0.0.1:9000' 'myaccesskey' 'supersecret'
+        ${pkgs.minio-client}/bin/mc --config-dir $mc_config_dir mb myminio/mybucket
+      '';
+      isClosure = true;
+      vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
+      assertVMOutput = "Onwards and upwards.";
+    }
+  );
 
-  closure-nixos-nar-bridge = (mkBootTest {
-    blobServiceAddr = "objectstore+file:///build/blobs";
-    path = testSystem;
-    useNarBridge = true;
-    isClosure = true;
-    vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
-    assertVMOutput = "Onwards and upwards.";
-  });
+  closure-nixos-nar-bridge = (
+    mkBootTest {
+      blobServiceAddr = "objectstore+file:///build/blobs";
+      path = testSystem;
+      useNarBridge = true;
+      isClosure = true;
+      vmCmdline = "init=${testSystem}/init panic=-1"; # reboot immediately on panic
+      assertVMOutput = "Onwards and upwards.";
+    }
+  );
 }

snix/build-go/default.nix

@@ -9,25 +9,26 @@ in
   name = "build-go";
   src = depot.third_party.gitignoreSource ./.;
   vendorHash = "sha256:1j652an8ir1ybyj21znaipsir7mbs3v972mw27ppsjz9dgh2crx6";
-}).overrideAttrs (_: {
-  meta.ci.extraSteps = {
-    check = {
-      label = ":water_buffalo: ensure generated protobuf files match";
-      needsOutput = true;
-      command = pkgs.writeShellScript "pb-go-check" ''
-        ${regenerate}
-        if [[ -n "$(git status --porcelain -unormal)" ]]; then
-            echo "-----------------------------"
-            echo ".pb.go files need to be updated, mg run //snix/build-go/regenerate"
-            echo "-----------------------------"
-            git status -unormal
-            exit 1
-        fi
-      '';
-      alwaysRun = true;
+}).overrideAttrs
+  (_: {
+    meta.ci.extraSteps = {
+      check = {
+        label = ":water_buffalo: ensure generated protobuf files match";
+        needsOutput = true;
+        command = pkgs.writeShellScript "pb-go-check" ''
+          ${regenerate}
+          if [[ -n "$(git status --porcelain -unormal)" ]]; then
+              echo "-----------------------------"
+              echo ".pb.go files need to be updated, mg run //snix/build-go/regenerate"
+              echo "-----------------------------"
+              git status -unormal
+              exit 1
+          fi
+        '';
+        alwaysRun = true;
+      };
     };
-  };
-  # https://git.snix.dev/snix/snix/issues/60
-  meta.ci.skip = true;
-  passthru.regenerate = regenerate;
-})
+    # https://git.snix.dev/snix/snix/issues/60
+    meta.ci.skip = true;
+    passthru.regenerate = regenerate;
+  })

snix/build/default.nix

@@ -2,10 +2,15 @@
 
 (depot.snix.crates.workspaceMembers.snix-build.build.override {
   runTests = true;
-}).overrideAttrs (old: rec {
-  meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
-  passthru = old.passthru // (depot.snix.utils.mkFeaturePowerset {
-    inherit (old) crateName;
-    features = [ "tonic-reflection" ];
-  });
-})
+}).overrideAttrs
+  (old: rec {
+    meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (
+      lib.attrNames passthru
+    );
+    passthru =
+      old.passthru
+      // (depot.snix.utils.mkFeaturePowerset {
+        inherit (old) crateName;
+        features = [ "tonic-reflection" ];
+      });
+  })

snix/build/protos/default.nix

@@ -1,4 +1,9 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 let
   protos = lib.sourceByRegex depot.path.origSrc [
     "buf.yaml"

snix/castore-go/default.nix

@@ -9,23 +9,24 @@ in
   name = "castore-go";
   src = depot.third_party.gitignoreSource ./.;
   vendorHash = "sha256:03wwzk7irlb05y0zjfmpp5c2dxhcpnmfc169g05sn6d3ni07aly8";
-}).overrideAttrs (_: {
-  meta.ci.extraSteps = {
-    check = {
-      label = ":water_buffalo: ensure generated protobuf files match";
-      needsOutput = true;
-      command = pkgs.writeShellScript "pb-go-check" ''
-        ${regenerate}
-        if [[ -n "$(git status --porcelain -unormal)" ]]; then
-            echo "-----------------------------"
-            echo ".pb.go files need to be updated, mg run //snix/castore-go/regenerate"
-            echo "-----------------------------"
-            git status -unormal
-            exit 1
-        fi
-      '';
-      alwaysRun = true;
+}).overrideAttrs
+  (_: {
+    meta.ci.extraSteps = {
+      check = {
+        label = ":water_buffalo: ensure generated protobuf files match";
+        needsOutput = true;
+        command = pkgs.writeShellScript "pb-go-check" ''
+          ${regenerate}
+          if [[ -n "$(git status --porcelain -unormal)" ]]; then
+              echo "-----------------------------"
+              echo ".pb.go files need to be updated, mg run //snix/castore-go/regenerate"
+              echo "-----------------------------"
+              git status -unormal
+              exit 1
+          fi
+        '';
+        alwaysRun = true;
+      };
     };
-  };
-  passthru.regenerate = regenerate;
-})
+    passthru.regenerate = regenerate;
+  })

snix/castore/default.nix

@@ -1,28 +1,51 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 (depot.snix.crates.workspaceMembers.snix-castore.build.override {
   runTests = true;
   testPreRun = ''
     export SSL_CERT_FILE=/dev/null
   '';
-}).overrideAttrs (old: rec {
-  meta.ci.targets = [ "integration-tests" ] ++ lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
-  passthru = (depot.snix.utils.mkFeaturePowerset {
-    inherit (old) crateName;
-    features = ([ "cloud" "fuse" "tonic-reflection" "xp-composition-url-refs" ]
-      # virtiofs feature currently fails to build on Darwin
-      ++ lib.optional pkgs.stdenv.isLinux "virtiofs");
-    override.testPreRun = ''
-      export SSL_CERT_FILE=/dev/null
-    '';
-  }) // {
-    integration-tests = depot.snix.crates.workspaceMembers.${old.crateName}.build.override (old: {
-      runTests = true;
-      testPreRun = ''
-        export SSL_CERT_FILE=/dev/null
-        export PATH="$PATH:${pkgs.lib.makeBinPath [ pkgs.cbtemulator pkgs.google-cloud-bigtable-tool ]}"
-      '';
-      features = old.features ++ [ "integration" ];
-    });
-  };
-})
+}).overrideAttrs
+  (old: rec {
+    meta.ci.targets = [
+      "integration-tests"
+    ]
+    ++ lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
+    passthru =
+      (depot.snix.utils.mkFeaturePowerset {
+        inherit (old) crateName;
+        features = (
+          [
+            "cloud"
+            "fuse"
+            "tonic-reflection"
+            "xp-composition-url-refs"
+          ]
+          # virtiofs feature currently fails to build on Darwin
+          ++ lib.optional pkgs.stdenv.isLinux "virtiofs"
+        );
+        override.testPreRun = ''
+          export SSL_CERT_FILE=/dev/null
+        '';
+      })
+      // {
+        integration-tests = depot.snix.crates.workspaceMembers.${old.crateName}.build.override (old: {
+          runTests = true;
+          testPreRun = ''
+            export SSL_CERT_FILE=/dev/null
+            export PATH="$PATH:${
+              pkgs.lib.makeBinPath [
+                pkgs.cbtemulator
+                pkgs.google-cloud-bigtable-tool
+              ]
+            }"
+          '';
+          features = old.features ++ [ "integration" ];
+        });
+      };
+  })

snix/castore/protos/default.nix

@@ -1,4 +1,9 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 let
   protos = lib.sourceByRegex depot.path.origSrc [
     "buf.yaml"

snix/cli/default.nix

@@ -1,111 +1,176 @@
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 (depot.snix.crates.workspaceMembers.snix-cli.build.override {
   runTests = true;
   testPreRun = ''
     export SSL_CERT_FILE=/dev/null
   '';
-}).overrideAttrs (finalAttrs: previousAttrs:
+}).overrideAttrs
+  (
+    finalAttrs: previousAttrs:
 
-let
-  snix-cli = finalAttrs.finalPackage;
+    let
+      snix-cli = finalAttrs.finalPackage;
 
-  benchmark-gnutime-format-string =
-    description:
-    "Benchmark: " +
-    (builtins.toJSON {
-      "${description}" = {
-        kbytes = "%M";
-        system = "%S";
-        user = "%U";
+      benchmark-gnutime-format-string =
+        description:
+        "Benchmark: "
+        + (builtins.toJSON {
+          "${description}" = {
+            kbytes = "%M";
+            system = "%S";
+            user = "%U";
+          };
+        });
+
+      # You can run the benchmark with a simple `nix run`, like:
+      #
+      #  nix-build -A snix.cli.meta.ci.extraSteps.benchmark-nixpkgs-cross-hello-outpath
+      #
+      # TODO(amjoseph): store these results someplace more durable, like git trailers
+      #
+      mkExprBenchmark =
+        { expr, description }:
+        let
+          name = "snix-cli-benchmark-${description}";
+        in
+        (pkgs.runCommand name { } ''
+          export SSL_CERT_FILE=/dev/null
+          ${lib.escapeShellArgs [
+            "${pkgs.time}/bin/time"
+            "--format"
+            "${benchmark-gnutime-format-string description}"
+            "${snix-cli}/bin/snix"
+            "--no-warnings"
+            "-E"
+            expr
+          ]}
+          touch $out
+        '');
+
+      mkNixpkgsBenchmark =
+        attrpath:
+        mkExprBenchmark {
+          description = builtins.replaceStrings [ ".drv" ] [ "-drv" ] attrpath;
+          expr = "(import ${pkgs.path} {}).${attrpath}";
+        };
+
+      # Constructs a Derivation invoking snix-cli inside a build, ensures the
+      # calculated snix output path matches what's passed in externally.
+      mkNixpkgsEvalTest =
+        {
+          attrPath ? null, # An attribute that must already be accessible from `pkgs`. Should evaluate to a store path.
+          expr ? null, # A Nix expression that should evaluate to a store path.
+          expectedPath, # The expected store path that should match one of the above.
+        }:
+        assert lib.assertMsg (attrPath != null || expr != null) "Either 'attrPath' or 'expr' must be set.";
+        let
+          name = "snix-eval-test-${
+            builtins.replaceStrings [ ".drv" ] [ "-drv" ] (if expr != null then "custom-expr" else attrPath)
+          }";
+        in
+        (pkgs.runCommand name { } ''
+          export SSL_CERT_FILE=/dev/null
+          SNIX_OUTPUT=$(${snix-cli}/bin/snix --no-warnings -E '${
+            if expr != null then expr else "(import ${pkgs.path} {}).${attrPath}"
+          }')
+          EXPECTED='${
+            # the verbatim expected Snix output:
+            "=> \"${builtins.unsafeDiscardStringContext expectedPath}\" :: string"
+          }'
+
+          echo "Snix output: ''${SNIX_OUTPUT}"
+          if [ "$SNIX_OUTPUT" != "$EXPECTED" ]; then
+            echo "Correct would have been ''${EXPECTED}"
+            exit 1
+          fi
+
+          echo "Output was correct."
+          touch $out
+        '');
+
+      benchmarks = {
+        benchmark-hello = (mkNixpkgsBenchmark "hello.outPath");
+        benchmark-cross-hello = (mkNixpkgsBenchmark "pkgsCross.aarch64-multiplatform.hello.outPath");
+        benchmark-firefox = (mkNixpkgsBenchmark "firefox.outPath");
+        benchmark-cross-firefox = (mkNixpkgsBenchmark "pkgsCross.aarch64-multiplatform.firefox.outPath");
+        # Example used for benchmarking LightSpan::Delayed in commit bf286a54bc2ac5eeb78c3d5c5ae66e9af24d74d4
+        benchmark-nixpkgs-attrnames = (
+          mkExprBenchmark {
+            expr = "builtins.length (builtins.attrNames (import ${pkgs.path} {}))";
+            description = "nixpkgs-attrnames";
+          }
+        );
       };
-    });
 
-  # You can run the benchmark with a simple `nix run`, like:
-  #
-  #  nix-build -A snix.cli.meta.ci.extraSteps.benchmark-nixpkgs-cross-hello-outpath
-  #
-  # TODO(amjoseph): store these results someplace more durable, like git trailers
-  #
-  mkExprBenchmark = { expr, description }:
-    let name = "snix-cli-benchmark-${description}"; in
-    (pkgs.runCommand name { } ''
-      export SSL_CERT_FILE=/dev/null
-      ${lib.escapeShellArgs [
-        "${pkgs.time}/bin/time"
-        "--format" "${benchmark-gnutime-format-string description}"
-        "${snix-cli}/bin/snix"
-        "--no-warnings"
-        "-E" expr
-      ]}
-      touch $out
-    '');
+      evalTests = {
+        eval-nixpkgs-stdenv-drvpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "stdenv.drvPath";
+            expectedPath = pkgs.stdenv.drvPath;
+          }
+        );
+        eval-nixpkgs-stdenv-outpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "stdenv.outPath";
+            expectedPath = pkgs.stdenv.outPath;
+          }
+        );
+        eval-nixpkgs-hello-outpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "hello.outPath";
+            expectedPath = pkgs.hello.outPath;
+          }
+        );
+        eval-nixpkgs-firefox-outpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "firefox.outPath";
+            expectedPath = pkgs.firefox.outPath;
+          }
+        );
+        eval-nixpkgs-firefox-drvpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "firefox.drvPath";
+            expectedPath = pkgs.firefox.drvPath;
+          }
+        );
+        eval-nixpkgs-cross-stdenv-outpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "pkgsCross.aarch64-multiplatform.stdenv.outPath";
+            expectedPath = pkgs.pkgsCross.aarch64-multiplatform.stdenv.outPath;
+          }
+        );
+        eval-nixpkgs-cross-hello-outpath = (
+          mkNixpkgsEvalTest {
+            attrPath = "pkgsCross.aarch64-multiplatform.hello.outPath";
+            expectedPath = pkgs.pkgsCross.aarch64-multiplatform.hello.outPath;
+          }
+        );
+        eval-nixpkgs-nixos-graphical-installer-drvpath = (
+          mkNixpkgsEvalTest {
+            expr = "(import ${pkgs.path}/nixos/release.nix { }).iso_graphical.${pkgs.system}.drvPath";
+            expectedPath = (import "${pkgs.path}/nixos/release.nix" { }).iso_graphical.${pkgs.system}.drvPath;
+          }
+        );
+        eval-nixpkgs-nixos-graphical-installer-outpath = (
+          mkNixpkgsEvalTest {
+            expr = "(import ${pkgs.path}/nixos/release.nix { }).iso_graphical.${pkgs.system}.outPath";
+            expectedPath = (import "${pkgs.path}/nixos/release.nix" { }).iso_graphical.${pkgs.system}.outPath;
+          }
+        );
+      };
+    in
+    {
+      meta = {
+        ci.targets = (builtins.attrNames benchmarks) ++ (builtins.attrNames evalTests);
+      };
 
-  mkNixpkgsBenchmark = attrpath:
-    mkExprBenchmark {
-      description = builtins.replaceStrings [ ".drv" ] [ "-drv" ] attrpath;
-      expr = "(import ${pkgs.path} {}).${attrpath}";
-    };
-
-  # Constructs a Derivation invoking snix-cli inside a build, ensures the
-  # calculated snix output path matches what's passed in externally.
-  mkNixpkgsEvalTest =
-    { attrPath ? null # An attribute that must already be accessible from `pkgs`. Should evaluate to a store path.
-    , expr ? null # A Nix expression that should evaluate to a store path.
-    , expectedPath # The expected store path that should match one of the above.
-    }:
-      assert lib.assertMsg (attrPath != null || expr != null) "Either 'attrPath' or 'expr' must be set.";
-      let
-        name = "snix-eval-test-${builtins.replaceStrings [".drv"] ["-drv"] (if expr != null then "custom-expr" else attrPath)}";
-      in
-      (pkgs.runCommand name { } ''
-        export SSL_CERT_FILE=/dev/null
-        SNIX_OUTPUT=$(${snix-cli}/bin/snix --no-warnings -E '${if expr != null then expr else "(import ${pkgs.path} {}).${attrPath}"}')
-        EXPECTED='${/* the verbatim expected Snix output: */ "=> \"${builtins.unsafeDiscardStringContext expectedPath}\" :: string"}'
-
-        echo "Snix output: ''${SNIX_OUTPUT}"
-        if [ "$SNIX_OUTPUT" != "$EXPECTED" ]; then
-          echo "Correct would have been ''${EXPECTED}"
-          exit 1
-        fi
-
-        echo "Output was correct."
-        touch $out
-      '');
-
-
-  benchmarks = {
-    benchmark-hello = (mkNixpkgsBenchmark "hello.outPath");
-    benchmark-cross-hello = (mkNixpkgsBenchmark "pkgsCross.aarch64-multiplatform.hello.outPath");
-    benchmark-firefox = (mkNixpkgsBenchmark "firefox.outPath");
-    benchmark-cross-firefox = (mkNixpkgsBenchmark "pkgsCross.aarch64-multiplatform.firefox.outPath");
-    # Example used for benchmarking LightSpan::Delayed in commit bf286a54bc2ac5eeb78c3d5c5ae66e9af24d74d4
-    benchmark-nixpkgs-attrnames = (mkExprBenchmark { expr = "builtins.length (builtins.attrNames (import ${pkgs.path} {}))"; description = "nixpkgs-attrnames"; });
-  };
-
-  evalTests = {
-    eval-nixpkgs-stdenv-drvpath = (mkNixpkgsEvalTest { attrPath = "stdenv.drvPath"; expectedPath = pkgs.stdenv.drvPath; });
-    eval-nixpkgs-stdenv-outpath = (mkNixpkgsEvalTest { attrPath = "stdenv.outPath"; expectedPath = pkgs.stdenv.outPath; });
-    eval-nixpkgs-hello-outpath = (mkNixpkgsEvalTest { attrPath = "hello.outPath"; expectedPath = pkgs.hello.outPath; });
-    eval-nixpkgs-firefox-outpath = (mkNixpkgsEvalTest { attrPath = "firefox.outPath"; expectedPath = pkgs.firefox.outPath; });
-    eval-nixpkgs-firefox-drvpath = (mkNixpkgsEvalTest { attrPath = "firefox.drvPath"; expectedPath = pkgs.firefox.drvPath; });
-    eval-nixpkgs-cross-stdenv-outpath = (mkNixpkgsEvalTest { attrPath = "pkgsCross.aarch64-multiplatform.stdenv.outPath"; expectedPath = pkgs.pkgsCross.aarch64-multiplatform.stdenv.outPath; });
-    eval-nixpkgs-cross-hello-outpath = (mkNixpkgsEvalTest { attrPath = "pkgsCross.aarch64-multiplatform.hello.outPath"; expectedPath = pkgs.pkgsCross.aarch64-multiplatform.hello.outPath; });
-    eval-nixpkgs-nixos-graphical-installer-drvpath = (mkNixpkgsEvalTest {
-      expr = "(import ${pkgs.path}/nixos/release.nix { }).iso_graphical.${pkgs.system}.drvPath";
-      expectedPath = (import "${pkgs.path}/nixos/release.nix" { }).iso_graphical.${pkgs.system}.drvPath;
-    });
-    eval-nixpkgs-nixos-graphical-installer-outpath = (mkNixpkgsEvalTest {
-      expr = "(import ${pkgs.path}/nixos/release.nix { }).iso_graphical.${pkgs.system}.outPath";
-      expectedPath = (import "${pkgs.path}/nixos/release.nix" { }).iso_graphical.${pkgs.system}.outPath;
-    });
-  };
-in
-{
-  meta = {
-    ci.targets = (builtins.attrNames benchmarks) ++ (builtins.attrNames evalTests);
-  };
-
-  # Expose benchmarks and evalTests as standard CI targets.
-  passthru = previousAttrs.passthru // benchmarks // evalTests;
-})
+      # Expose benchmarks and evalTests as standard CI targets.
+      passthru = previousAttrs.passthru // benchmarks // evalTests;
+    }
+  )

snix/cli/tests/import.nix

@@ -1 +1 @@
-{}: import ./six.nix { }
+{ }: import ./six.nix { }

snix/cli/tests/six.nix

@@ -1 +1,8 @@
-{}: { six = builtins.foldl' (x: y: x + y) 0 [ 1 2 3 ]; }
+{ }:
+{
+  six = builtins.foldl' (x: y: x + y) 0 [
+    1
+    2
+    3
+  ];
+}

snix/default.nix

@@ -1,5 +1,11 @@
 # Nix helpers for projects under //snix
-{ pkgs, lib, depot, here, ... }:
+{
+  pkgs,
+  lib,
+  depot,
+  here,
+  ...
+}:
 
 let
   # Load the crate2nix crate tree.
@@ -13,13 +19,18 @@ let
     # Extract the hashes from `crates` / Cargo.nix, we already get them from cargo2nix.
     # This returns an attribute set containing "${crateName}-${version}" as key,
     # and the outputHash as value.
-    outputHashes = builtins.listToAttrs
-      (map
-        (k:
-          (lib.nameValuePair "${crates.internal.crates.${k}.crateName}-${crates.internal.crates.${k}.version}" crates.internal.crates.${k}.src.outputHash)
-        ) [
-        "wu-manber"
-      ]);
+    outputHashes = builtins.listToAttrs (
+      map
+        (
+          k:
+          (lib.nameValuePair "${crates.internal.crates.${k}.crateName}-${
+            crates.internal.crates.${k}.version
+          }" crates.internal.crates.${k}.src.outputHash)
+        )
+        [
+          "wu-manber"
+        ]
+    );
   };
 
   # The cleaned sources.
@@ -36,32 +47,42 @@ let
     ];
   };
 
-  mkCargoBuild = args: pkgs.stdenv.mkDerivation ({
-    inherit cargoDeps src;
-    PROTO_ROOT = protos;
-    SNIX_BUILD_SANDBOX_SHELL = "/homeless-shelter";
+  mkCargoBuild =
+    args:
+    pkgs.stdenv.mkDerivation (
+      {
+        inherit cargoDeps src;
+        PROTO_ROOT = protos;
+        SNIX_BUILD_SANDBOX_SHELL = "/homeless-shelter";
 
-    nativeBuildInputs = with pkgs; [
-      cargo
-      pkg-config
-      protobuf
-      rustc
-      rustPlatform.cargoSetupHook
-    ] ++ (args.nativeBuildInputs or [ ]);
-  } // (pkgs.lib.removeAttrs args [ "nativeBuildInputs" ]));
+        nativeBuildInputs =
+          with pkgs;
+          [
+            cargo
+            pkg-config
+            protobuf
+            rustc
+            rustPlatform.cargoSetupHook
+          ]
+          ++ (args.nativeBuildInputs or [ ]);
+      }
+      // (pkgs.lib.removeAttrs args [ "nativeBuildInputs" ])
+    );
 in
 {
   inherit crates protos mkCargoBuild;
 
   # Provide the snix logo in both .webp and .png format.
-  logo = pkgs.runCommand "logo"
-    {
-      nativeBuildInputs = [ pkgs.imagemagick ];
-    } ''
-    mkdir -p $out
-    cp ${./logo.webp} $out/logo.webp
-    convert $out/logo.webp $out/logo.png
-  '';
+  logo =
+    pkgs.runCommand "logo"
+      {
+        nativeBuildInputs = [ pkgs.imagemagick ];
+      }
+      ''
+        mkdir -p $out
+        cp ${./logo.webp} $out/logo.webp
+        convert $out/logo.webp $out/logo.png
+      '';
 
   # Provide a shell for the combined dependencies of all snix Rust
   # projects. Note that as this is manually maintained it may be
@@ -73,7 +94,12 @@ in
   shell = (import ./shell.nix { inherit pkgs; });
 
   # Shell, but with tools necessary to run the integration tests
-  shell-integration = (import ./shell.nix { inherit pkgs; withIntegration = true; });
+  shell-integration = (
+    import ./shell.nix {
+      inherit pkgs;
+      withIntegration = true;
+    }
+  );
 
   # Build the Rust documentation for publishing on snix.dev/rustdoc.
   rust-docs = mkCargoBuild {
@@ -81,7 +107,8 @@ in
 
     buildInputs = [
       pkgs.fuse
-    ] ++ lib.optional pkgs.stdenv.isDarwin pkgs.libiconv;
+    ]
+    ++ lib.optional pkgs.stdenv.isDarwin pkgs.libiconv;
 
     buildPhase = ''
       RUSTDOCFLAGS="-D rustdoc::broken-intra-doc-links" cargo doc --document-private-items

snix/eval/default.nix

@@ -1,5 +1,10 @@
 # TODO: find a way to build the benchmarks via crate2nix
-{ depot, pkgs, lib, ... }:
+{
+  depot,
+  pkgs,
+  lib,
+  ...
+}:
 
 (depot.snix.crates.workspaceMembers.snix-eval.build.override {
   runTests = true;
@@ -7,11 +12,16 @@
   # Make C++ Nix available, to compare eval results against.
   # This needs Nix 2.3, as nix_oracle.rs fails with pkgs.nix
   testInputs = [ pkgs.nix_2_3 ];
-}).overrideAttrs (old: rec {
-  meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
-  passthru = old.passthru // (depot.snix.utils.mkFeaturePowerset {
-    inherit (old) crateName;
-    features = [ "nix_tests" ];
-    override.testInputs = [ pkgs.nix ];
-  });
-})
+}).overrideAttrs
+  (old: rec {
+    meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (
+      lib.attrNames passthru
+    );
+    passthru =
+      old.passthru
+      // (depot.snix.utils.mkFeaturePowerset {
+        inherit (old) crateName;
+        features = [ "nix_tests" ];
+        override.testInputs = [ pkgs.nix ];
+      });
+  })

snix/glue/default.nix

@@ -5,13 +5,18 @@
   testPreRun = ''
     export SSL_CERT_FILE=/dev/null
   '';
-}).overrideAttrs (old: rec {
-  meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (lib.attrNames passthru);
-  passthru = old.passthru // (depot.snix.utils.mkFeaturePowerset {
-    inherit (old) crateName;
-    features = [ "nix_tests" ];
-    override.testPreRun = ''
-      export SSL_CERT_FILE=/dev/null
-    '';
-  });
-})
+}).overrideAttrs
+  (old: rec {
+    meta.ci.targets = lib.filter (x: lib.hasPrefix "with-features" x || x == "no-features") (
+      lib.attrNames passthru
+    );
+    passthru =
+      old.passthru
+      // (depot.snix.utils.mkFeaturePowerset {
+        inherit (old) crateName;
+        features = [ "nix_tests" ];
+        override.testPreRun = ''
+          export SSL_CERT_FILE=/dev/null
+        '';
+      });
+  })

snix/glue/src/builtins/derivation.nix

@@ -4,31 +4,37 @@
 #
 # TODO: rewrite in native Rust code
 
-/* This is the implementation of the ‘derivation’ builtin function.
-   It's actually a wrapper around the ‘derivationStrict’ primop. */
+/*
+  This is the implementation of the ‘derivation’ builtin function.
+  It's actually a wrapper around the ‘derivationStrict’ primop.
+*/
 
-drvAttrs @ { outputs ? [ "out" ], ... }:
+drvAttrs@{
+  outputs ? [ "out" ],
+  ...
+}:
 
 let
 
   strict = derivationStrict drvAttrs;
 
-  commonAttrs = drvAttrs // (builtins.listToAttrs outputsList) //
-    {
+  commonAttrs =
+    drvAttrs
+    // (builtins.listToAttrs outputsList)
+    // {
       all = map (x: x.value) outputsList;
       inherit drvAttrs;
     };
 
-  outputToAttrListElement = outputName:
-    {
-      name = outputName;
-      value = commonAttrs // {
-        outPath = builtins.getAttr outputName strict;
-        drvPath = strict.drvPath;
-        type = "derivation";
-        inherit outputName;
-      };
+  outputToAttrListElement = outputName: {
+    name = outputName;
+    value = commonAttrs // {
+      outPath = builtins.getAttr outputName strict;
+      drvPath = strict.drvPath;
+      type = "derivation";
+      inherit outputName;
     };
+  };
 
   outputsList = map outputToAttrListElement outputs;
 

snix/glue/src/fetchurl.nix

@@ -5,21 +5,42 @@
 #
 # Source: https://github.com/NixOS/nix/blob/2.3.16/corepkgs/fetchurl.nix
 
-{ system ? "" # obsolete
-, url
-, hash ? "" # an SRI hash
+{
+  system ? "", # obsolete
+  url,
+  hash ? "", # an SRI hash
 
   # Legacy hash specification
-, md5 ? ""
-, sha1 ? ""
-, sha256 ? ""
-, sha512 ? ""
-, outputHash ? if hash != "" then hash else if sha512 != "" then sha512 else if sha1 != "" then sha1 else if md5 != "" then md5 else sha256
-, outputHashAlgo ? if hash != "" then "" else if sha512 != "" then "sha512" else if sha1 != "" then "sha1" else if md5 != "" then "md5" else "sha256"
+  md5 ? "",
+  sha1 ? "",
+  sha256 ? "",
+  sha512 ? "",
+  outputHash ?
+    if hash != "" then
+      hash
+    else if sha512 != "" then
+      sha512
+    else if sha1 != "" then
+      sha1
+    else if md5 != "" then
+      md5
+    else
+      sha256,
+  outputHashAlgo ?
+    if hash != "" then
+      ""
+    else if sha512 != "" then
+      "sha512"
+    else if sha1 != "" then
+      "sha1"
+    else if md5 != "" then
+      "md5"
+    else
+      "sha256",
 
-, executable ? false
-, unpack ? false
-, name ? baseNameOf (toString url)
+  executable ? false,
+  unpack ? false,
+  name ? baseNameOf (toString url),
 }:
 
 derivation {
@@ -29,7 +50,12 @@ derivation {
   inherit outputHashAlgo outputHash;
   outputHashMode = if unpack || executable then "recursive" else "flat";
 
-  inherit name url executable unpack;
+  inherit
+    name
+    url
+    executable
+    unpack
+    ;
 
   system = "builtin";
 

snix/glue/src/tests/nix_tests/eval-okay-context-introspection.nix

@@ -3,7 +3,10 @@ let
     name = "fail";
     builder = "/bin/false";
     system = "x86_64-linux";
-    outputs = [ "out" "foo" ];
+    outputs = [
+      "out"
+      "foo"
+    ];
   };
 
   path = "${./eval-okay-context-introspection.nix}";
@@ -13,7 +16,10 @@ let
       path = true;
     };
     "${builtins.unsafeDiscardStringContext drv.drvPath}" = {
-      outputs = [ "foo" "out" ];
+      outputs = [
+        "foo"
+        "out"
+      ];
       allOutputs = true;
     };
   };
@@ -21,15 +27,12 @@ let
   combo-path = "${path}${drv.outPath}${drv.foo.outPath}${drv.drvPath}";
   legit-context = builtins.getContext combo-path;
 
-  reconstructed-path = builtins.appendContext
-    (builtins.unsafeDiscardStringContext combo-path)
-    desired-context;
+  reconstructed-path = builtins.appendContext (builtins.unsafeDiscardStringContext combo-path) desired-context;
 
   # Eta rule for strings with context.
-  etaRule = str:
-    str == builtins.appendContext
-      (builtins.unsafeDiscardStringContext str)
-      (builtins.getContext str);
+  etaRule =
+    str:
+    str == builtins.appendContext (builtins.unsafeDiscardStringContext str) (builtins.getContext str);
 
 in
 [

snix/glue/src/tests/nix_tests/eval-okay-context.nix

@@ -1,6 +1,7 @@
-let s = "foo ${builtins.substring 33 100 (baseNameOf "${./eval-okay-context.nix}")} bar";
+let
+  s = "foo ${builtins.substring 33 100 (baseNameOf "${./eval-okay-context.nix}")} bar";
 in
-if s != "foo eval-okay-context.nix bar"
-then abort "context not discarded"
-else builtins.unsafeDiscardStringContext s
-
+if s != "foo eval-okay-context.nix bar" then
+  abort "context not discarded"
+else
+  builtins.unsafeDiscardStringContext s