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don't include derivation name in temporary build directories

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With the migration to /nix/var/nix/builds we now have failing builds
when the derivation name is too long.
This change removes the derivation name from the temporary build to have
a predictable prefix length:

Also see: https://github.com/NixOS/infra/pull/764
for context.

(cherry picked from commit 725a2f379f)
This commit is contained in:
Jörg Thalheim 2025-08-27 09:29:47 +02:00 • committed by Mergify
parent 30229311fa
commit 9001121bd6
4 changed files with 14 additions and 8 deletions
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2
src/libstore/unix/build/derivation-builder.cc
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@ -736,7 +736,7 @@ 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());