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copyStorePath(): Bail out early if the store path already exists

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In rare cases (e.g. when using allowSubstitutes = false), it's
possible that we simultaneously have a DerivationGoal *and* a
SubstitutionGoal building the same path. So if a DerivationGoal
already built the path while the SubstitutionGoal was waiting for a
download slot, it saves us a superfluous download to exit early.

(cherry picked from commit dca0a80240)
This commit is contained in:
Eelco Dolstra 2024-01-18 17:16:34 +01:00 committed by github-actions[bot]
parent cc94ea5a17
commit fdf5313e7e
1 changed files with 5 additions and 0 deletions
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5
src/libstore/store-api.cc
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@ -982,6 +982,11 @@ void copyStorePath(
RepairFlag repair,
CheckSigsFlag checkSigs)
{
/* Bail out early (before starting a download from srcStore) if
dstStore already has this path. */
if (!repair && dstStore.isValidPath(storePath))
return;
auto srcUri = srcStore.getUri();
auto dstUri = dstStore.getUri();
auto storePathS = srcStore.printStorePath(storePath);