writeDirectReferencesToFile: init

This commit is contained in:
Robert Hensing 2021-05-14 17:27:25 +02:00
parent 80a3e0dc0e
commit cc60f81e69
5 changed files with 113 additions and 0 deletions

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@ -50,3 +50,24 @@ Many more commands wrap `writeTextFile` including `writeText`, `writeTextDir`, `
## `symlinkJoin` {#trivial-builder-symlinkJoin}
This can be used to put many derivations into the same directory structure. It works by creating a new derivation and adding symlinks to each of the paths listed. It expects two arguments, `name`, and `paths`. `name` is the name used in the Nix store path for the created derivation. `paths` is a list of paths that will be symlinked. These paths can be to Nix store derivations or any other subdirectory contained within.
## `writeDirectReferencesToFile` {#trivial-builder-writeDirectReferencesToFile}
Writes the set of references to the output file, that is, their immediate dependencies.
This produces the equivalent of `nix-store -q --references`.
For example,
```nix
writeDirectReferencesToFile (writeScriptBin "hi" ''${hello}/bin/hello'')
```
produces an output path `/nix/store/<hash>-runtime-references` containing
```nix
/nix/store/<hash>-hello-2.10
```
but none of `hello`'s dependencies, because those are not referenced directly
by `hi`'s output.

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@ -438,6 +438,35 @@ rec {
done < graph
'';
/*
Write the set of references to a file, that is, their immediate dependencies.
This produces the equivalent of `nix-store -q --references`.
*/
writeDirectReferencesToFile = path: runCommand "runtime-references"
{
exportReferencesGraph = ["graph" path];
inherit path;
}
''
touch ./references
while read p; do
read dummy
read nrRefs
if [[ $p == $path ]]; then
for ((i = 0; i < nrRefs; i++)); do
read ref;
echo $ref >>./references
done
else
for ((i = 0; i < nrRefs; i++)); do
read ref;
done
fi
done < graph
sort ./references >$out
'';
/* Print an error message if the file with the specified name and
* hash doesn't exist in the Nix store. This function should only

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@ -0,0 +1,20 @@
{ lib, nixosTest, path, writeText, hello, figlet, stdenvNoCC }:
nixosTest {
name = "nixpkgs-trivial-builders";
nodes.machine = { ... }: {
virtualisation.writableStore = true;
# Test runs without network, so we don't substitute and prepare our deps
nix.binaryCaches = lib.mkForce [];
environment.etc."pre-built-paths".source = writeText "pre-built-paths" (
builtins.toJSON [hello figlet stdenvNoCC]
);
};
testScript = ''
machine.succeed("""
cd ${lib.cleanSource path}
./pkgs/build-support/trivial-builders/test.sh 2>/dev/console
""")
'';
}

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@ -0,0 +1,41 @@
#!/usr/bin/env bash
# -------------------------------------------------------------------------- #
#
# trivial-builders test
#
# -------------------------------------------------------------------------- #
#
# This file can be run independently (quick):
#
# $ pkgs/build-support/trivial-builders/test.sh
#
# or in the build sandbox with a ~20s VM overhead
#
# $ nix-build -A tests.trivial-builders
#
# -------------------------------------------------------------------------- #
# strict bash
set -euo pipefail
# debug
# set -x
# PS4='+(${BASH_SOURCE}:${LINENO}): ${FUNCNAME[0]:+${FUNCNAME[0]}(): }'
cd "$(dirname ${BASH_SOURCE[0]})" # nixpkgs root
testDirectReferences() {
expr="$1"
diff -U3 \
<(sort <$(nix-build --no-out-link --expr "with import ../../.. {}; writeDirectReferencesToFile ($expr)")) \
<(nix-store -q --references $(nix-build --no-out-link --expr "with import ../../.. {}; ($expr)") | sort)
}
testDirectReferences 'hello'
testDirectReferences 'figlet'
testDirectReferences 'writeText "hi" "hello"'
testDirectReferences 'writeText "hi" "hello ${hello}"'
testDirectReferences 'writeText "hi" "hello ${hello} ${figlet}"'
echo 'OK!'

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@ -50,5 +50,7 @@ with pkgs;
cuda = callPackage ./cuda { };
trivial = callPackage ../build-support/trivial-builders/test.nix {};
writers = callPackage ../build-support/writers/test.nix {};
}