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build: also throw hash-mismatch errors if buildMode == bmCheck

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This actually bit me quite recently in `nixpkgs` because I assumed that
`nix-build --check` would also error out if hashes don't match anymore[1]
and so I wrongly assumed that I couldn't reproduce the mismatch error.

The fix is rather simple, during the output registration a so-called
`delayedException` is instantiated e.g. if a FOD hash-mismatch occurs.
However, in case of `nix-build --check` (or `--rebuild` in case of `nix
build`), the code-path where this exception is thrown will never be
reached.

By adding that check to the if-clause that causes an early exit in case
of `bmCheck`, the issue is gone. Also added a (previously failing)
test-case to demonstrate the problem.

[1] https://github.com/NixOS/nixpkgs/pull/139238, the underlying issue
    was that `nix-prefetch-git` returns different hashes than `fetchgit`
    because the latter one fetches submodules by default.
This commit is contained in:
Maximilian Bosch 2021-09-26 15:20:36 +02:00
parent a0bb5c4130
commit bb1a851bcf
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3 changed files with 20 additions and 1 deletions
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8
src/libstore/build/local-derivation-goal.cc
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@ -2474,7 +2474,13 @@ void LocalDerivationGoal::registerOutputs()
infos.emplace(outputName, std::move(newInfo));
}
if (buildMode == bmCheck) return;
if (buildMode == bmCheck) {
// In case of FOD mismatches on `--check` an error must be thrown as this is also
// a source for non-determinism.
if (delayedException)
std::rethrow_exception(delayedException);
return;
}
/* Apply output checks. */
checkOutputs(infos);