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feat(nix/writeTree): init

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Add //nix/writeTree, a function to make a derivation to build a
directory structure from a Nix attribute set.

Co-authored-by: sterni <sternenseemann@systemli.org>
Change-Id: I9c0fc91611a55a20ad33de6f2b27abde4b6abd21
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10963
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Autosubmit: aspen <root@gws.fyi>
Reviewed-by: aspen <root@gws.fyi>
This commit is contained in:
Aspen Smith 2024-02-18 13:57:12 -05:00 • committed by clbot
parent d74c68025b
commit 944483ef5e
3 changed files with 145 additions and 0 deletions
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93
nix/writeTree/tests/default.nix Normal file
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{ depot, pkgs, lib, ... }:
let
inherit (pkgs) runCommand writeText writeTextFile;
inherit (depot.nix) writeTree;
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"
'';
in
depot.nix.readTree.drvTargets {
empty = checkTree "empty" { }
''
.
'';
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
'';
};
}
''
.
./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.
'';
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
'';
}