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Merge pull request #13839 from Mic92/infra

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don't include derivation name in temporary build directories
This commit is contained in:
John Ericson 2025-09-03 17:15:03 -04:00 • committed by GitHub
commit 7b22cd5105
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4 changed files with 14 additions and 8 deletions
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6
doc/manual/rl-next/shorter-build-dir-names.md Normal file
View file

@ -0,0 +1,6 @@
---
synopsis: "Temporary build directories no longer include derivation names"
prs: [13839]
---
Temporary build directories created during derivation builds no longer include the derivation name in their path to avoid build failures when the derivation name is too long. This change ensures predictable prefix lengths for build directories under `/nix/var/nix/builds`.

2
src/libstore/unix/build/derivation-builder.cc
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@ -720,7 +720,7 @@ void DerivationBuilderImpl::startBuilder()
/* Create a temporary directory where the build will take
place. */
topTmpDir = createTempDir(buildDir, "nix-build-" + std::string(drvPath.name()), 0700);
topTmpDir = createTempDir(buildDir, "nix", 0700);
setBuildTmpDir();
assert(!tmpDir.empty());

6
tests/functional/check.sh
View file

@ -52,10 +52,10 @@ test_custom_build_dir() {
nix-build check.nix -A failed --argstr checkBuildId "$checkBuildId" \
--no-out-link --keep-failed --option build-dir "$TEST_ROOT/custom-build-dir" 2> "$TEST_ROOT/log" || status=$?
[ "$status" = "100" ]
[[ 1 == "$(count "$customBuildDir/nix-build-"*)" ]]
local buildDir=("$customBuildDir/nix-build-"*)
[[ 1 == "$(count "$customBuildDir/nix-"*)" ]]
local buildDir=("$customBuildDir/nix-"*)
if [[ "${#buildDir[@]}" -ne 1 ]]; then
echo "expected one nix-build-* directory, got: ${buildDir[*]}" >&2
echo "expected one nix-* directory, got: ${buildDir[*]}" >&2
exit 1
fi
if [[ -e ${buildDir[*]}/build ]]; then

8
tests/nixos/user-sandboxing/default.nix
View file

@ -104,8 +104,8 @@ in
# Wait for the build to be ready
# This is OK because it runs as root, so we can access everything
machine.wait_until_succeeds("stat /nix/var/nix/builds/nix-build-open-build-dir.drv-*/build/syncPoint")
dir = machine.succeed("ls -d /nix/var/nix/builds/nix-build-open-build-dir.drv-*").strip()
machine.wait_until_succeeds("stat /nix/var/nix/builds/nix-*/build/syncPoint")
dir = machine.succeed("ls -d /nix/var/nix/builds/nix-*").strip()
# But Alice shouldn't be able to access the build directory
machine.fail(f"su alice -c 'ls {dir}/build'")
@ -125,8 +125,8 @@ in
args = [ (builtins.storePath "${create-hello-world}") ];
}' >&2 &
""".strip())
machine.wait_until_succeeds("stat /nix/var/nix/builds/nix-build-innocent.drv-*/build/syncPoint")
dir = machine.succeed("ls -d /nix/var/nix/builds/nix-build-innocent.drv-*").strip()
machine.wait_until_succeeds("stat /nix/var/nix/builds/nix-*/build/syncPoint")
dir = machine.succeed("ls -d /nix/var/nix/builds/nix-*").strip()
# The build ran as `nixbld1` (which is the only build user on the
# machine), but a process running as `nixbld1` outside the sandbox