Simplifies reusing the launch script in other use-cases than the "official" Nixery image. Relates to nixery#166 Change-Id: Iaf1dff385ce270792253551081c1b2fca6400037 Reviewed-on: https://cl.tvl.fyi/c/depot/+/11046 Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
		
			
				
	
	
		
			129 lines
		
	
	
	
		
			3.7 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
			
		
		
	
	
			129 lines
		
	
	
	
		
			3.7 KiB
		
	
	
	
		
			Nix
		
	
	
	
	
	
# Copyright 2022 The TVL Contributors
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# SPDX-License-Identifier: Apache-2.0
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# This function header aims to provide compatibility between builds of
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# Nixery taking place inside/outside of the TVL depot.
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#
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# In the future, Nixery will transition to using //nix/buildGo for its
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# build system and this will need some major adaptations to support
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# that.
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{ depot ? { nix.readTree.drvTargets = x: x; }
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, pkgs ? import <nixpkgs> { }
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, preLaunch ? ""
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, extraPackages ? [ ]
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, maxLayers ? 20
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, commitHash ? null
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, ...
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}@args:
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with pkgs;
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let
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  inherit (pkgs) buildGoModule lib;
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  # Avoid extracting this from git until we have a way to plumb
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  # through revision numbers.
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  nixery-commit-hash = "depot";
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in
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depot.nix.readTree.drvTargets rec {
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  # Implementation of the Nix image building logic
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  nixery-prepare-image = import ./prepare-image { inherit pkgs; };
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  # Include the Nixery website into the Nix store, unless its being
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  # overridden to something else. Nixery will serve this as its front
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  # page when visited from a browser.
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  nixery-web = ./web;
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  nixery-popcount = callPackage ./popcount { };
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  # Build Nixery's Go code, resulting in the binaries used for various
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  # bits of functionality.
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  #
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  # The server binary is wrapped to ensure that required environment
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  # variables are set at runtime.
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  nixery = buildGoModule rec {
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    name = "nixery";
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    src = ./.;
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    doCheck = true;
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    # Needs to be updated after every modification of go.mod/go.sum
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    vendorHash = "sha256-io9NCeZmjCZPLmII3ajXIsBWbT40XiW8ncXOuUDabbo=";
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    ldflags = [
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      "-s"
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      "-w"
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      "-X"
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      "main.version=${nixery-commit-hash}"
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    ];
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    nativeBuildInputs = [ makeWrapper ];
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    postInstall = ''
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      wrapProgram $out/bin/server \
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        --set-default WEB_DIR "${nixery-web}" \
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        --prefix PATH : ${nixery-prepare-image}/bin
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    '';
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    # Nixery is mirrored to Github at tazjin/nixery; this is
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    # automatically updated from CI for canon builds.
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    passthru.meta.ci.extraSteps.github = depot.tools.releases.filteredGitPush {
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      filter = ":/tools/nixery";
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      remote = "git@github.com:tazjin/nixery.git";
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      ref = "refs/heads/master";
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    };
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  };
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  # Wrapper script for the wrapper script (meta!) which configures
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  # the container environment appropriately.
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  #
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  # Most importantly, sandboxing is disabled to avoid privilege
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  # issues in containers.
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  nixery-launch-script = writeShellScriptBin "nixery" ''
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    set -e
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    export PATH=${coreutils}/bin:$PATH
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    export NIX_SSL_CERT_FILE=/etc/ssl/certs/ca-bundle.crt
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    mkdir -p /tmp
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    # Create the build user/group required by Nix
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    echo 'nixbld:x:30000:nixbld' >> /etc/group
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    echo 'nixbld:x:30000:30000:nixbld:/tmp:/bin/bash' >> /etc/passwd
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    echo 'root:x:0:0:root:/root:/bin/bash' >> /etc/passwd
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    echo 'root:x:0:' >> /etc/group
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    # Disable sandboxing to avoid running into privilege issues
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    mkdir -p /etc/nix
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    echo 'sandbox = false' >> /etc/nix/nix.conf
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    # In some cases users building their own image might want to
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    # customise something on the inside (e.g. set up an environment
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    # for keys or whatever).
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    #
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    # This can be achieved by setting a 'preLaunch' script.
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    ${preLaunch}
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    exec ${nixery}/bin/server
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  '';
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  # Container image containing Nixery and Nix itself. This image can
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  # be run on Kubernetes, published on AppEngine or whatever else is
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  # desired.
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  nixery-image = dockerTools.buildLayeredImage {
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    name = "nixery";
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    config.Cmd = [ "${nixery-launch-script}/bin/nixery" ];
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    inherit maxLayers;
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    contents = [
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      bashInteractive
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      cacert
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      coreutils
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      git
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      gnutar
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      gzip
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      iana-etc
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      nix
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      nixery-prepare-image
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      nixery-launch-script
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      openssh
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      zlib
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    ] ++ extraPackages;
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  };
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}
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