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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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5
tests/fixed.sh
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@ -15,6 +15,11 @@ nix path-info --json $path | grep fixed:md5:2qk15sxzzjlnpjk9brn7j8ppcd
echo 'testing good...'
nix-build fixed.nix -A good --no-out-link
if isDaemonNewer "2.4pre20210927"; then
echo 'testing --check...'
nix-build fixed.nix -A check --check && fail "should fail"
fi
echo 'testing good2...'
nix-build fixed.nix -A good2 --no-out-link