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Don’t readDerivation if impure derivations feature is disabled

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readDerivation is pretty slow, and while it may not be significant for
some use cases, on things like ghc-nix where we have thousands of
derivations is really slows things down.

So, this just doesn’t do the impure derivation check if the impure
derivation experimental feature is disabled. Perhaps we could cache
the result of isPure() and keep the check, but this is a quick fix to
for the slowdown introduced with impure derivations features in 2.8.0.
This commit is contained in:
Matthew Bauer 2022-09-02 11:46:34 -05:00
parent a9af12e658
commit 4894e567fb
1 changed files with 1 additions and 1 deletions
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2
src/libstore/build/derivation-goal.cc
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@ -344,7 +344,7 @@ void DerivationGoal::gaveUpOnSubstitution()
for (auto & i : dynamic_cast<Derivation *>(drv.get())->inputDrvs) {
/* Ensure that pure, non-fixed-output derivations don't
depend on impure derivations. */
if (drv->type().isPure() && !drv->type().isFixed()) {
if (settings.isExperimentalFeatureEnabled(Xp::ImpureDerivations) && drv->type().isPure() && !drv->type().isFixed()) {
auto inputDrv = worker.evalStore.readDerivation(i.first);
if (!inputDrv.type().isPure())
throw Error("pure derivation '%s' depends on impure derivation '%s'",