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libstore: fix race condition when creating state directories

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Running parallel nix in nix can lead to multiple instances trying to
create the state directories and failing on the `createSymlink` step,
because the link already exists.

`replaceSymlink` is already idempotent, so let's use that.

Resolves #2706
This commit is contained in:
Wolfgang Walther 2025-06-17 08:45:29 +02:00
parent cdb417854b
commit d64c922164
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1 changed files with 1 additions and 1 deletions
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src/libstore/local-store.cc
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@ -133,7 +133,7 @@ LocalStore::LocalStore(ref<const Config> config)
Path gcRootsDir = config->stateDir + "/gcroots"; Path gcRootsDir = config->stateDir + "/gcroots";
if (!pathExists(gcRootsDir)) { if (!pathExists(gcRootsDir)) {
createDirs(gcRootsDir); createDirs(gcRootsDir);
createSymlink(profilesDir, gcRootsDir + "/profiles"); replaceSymlink(profilesDir, gcRootsDir + "/profiles");
} }
for (auto & perUserDir : {profilesDir + "/per-user", gcRootsDir + "/per-user"}) { for (auto & perUserDir : {profilesDir + "/per-user", gcRootsDir + "/per-user"}) {