Maximilian Bosch
bb1a851bcf
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.
59 lines
2 KiB
Nix
59 lines
2 KiB
Nix
with import ./config.nix;
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rec {
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f2 = dummy: builder: mode: algo: hash: mkDerivation {
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name = "fixed";
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inherit builder;
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outputHashMode = mode;
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outputHashAlgo = algo;
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outputHash = hash;
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inherit dummy;
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impureEnvVars = ["IMPURE_VAR1" "IMPURE_VAR2"];
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};
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f = f2 "";
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good = [
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(f ./fixed.builder1.sh "flat" "md5" "8ddd8be4b179a529afa5f2ffae4b9858")
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(f ./fixed.builder1.sh "flat" "sha1" "a0b65939670bc2c010f4d5d6a0b3e4e4590fb92b")
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(f ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
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(f ./fixed.builder2.sh "recursive" "sha1" "vw46m23bizj4n8afrc0fj19wrp7mj3c0")
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];
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# Expression to test that `nix-build --check` also throws an error if the hash of
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# fixed-output derivation has changed even if the hash exists in the store (in this
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# case the hash exists because of `fixed.builder2.sh`, but building a derivation
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# with the same hash and a different result must throw an error).
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check = [
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(f ./fixed.builder1.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
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];
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good2 = [
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# Yes, this looks fscked up: builder2 doesn't have that result.
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# But Nix sees that an output with the desired hash already
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# exists, and will refrain from building it.
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(f ./fixed.builder2.sh "flat" "md5" "8ddd8be4b179a529afa5f2ffae4b9858")
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];
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sameAsAdd =
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f ./fixed.builder2.sh "recursive" "sha256" "1ixr6yd3297ciyp9im522dfxpqbkhcw0pylkb2aab915278fqaik";
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bad = [
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(f ./fixed.builder1.sh "flat" "md5" "0ddd8be4b179a529afa5f2ffae4b9858")
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];
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reallyBad = [
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# Hash too short, and not base-32 either.
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(f ./fixed.builder1.sh "flat" "md5" "ddd8be4b179a529afa5f2ffae4b9858")
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];
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# Test for building two derivations in parallel that produce the
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# same output path because they're fixed-output derivations.
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parallelSame = [
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(f2 "foo" ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
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(f2 "bar" ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
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];
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}
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