mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-10 16:26:18 +02:00
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.
58 lines
2 KiB
Nix
58 lines
2 KiB
Nix
with import ./config.nix;
|
|
|
|
rec {
|
|
|
|
f2 = dummy: builder: mode: algo: hash: mkDerivation {
|
|
name = "fixed";
|
|
inherit builder;
|
|
outputHashMode = mode;
|
|
outputHashAlgo = algo;
|
|
outputHash = hash;
|
|
inherit dummy;
|
|
impureEnvVars = ["IMPURE_VAR1" "IMPURE_VAR2"];
|
|
};
|
|
|
|
f = f2 "";
|
|
|
|
good = [
|
|
(f ./fixed.builder1.sh "flat" "md5" "8ddd8be4b179a529afa5f2ffae4b9858")
|
|
(f ./fixed.builder1.sh "flat" "sha1" "a0b65939670bc2c010f4d5d6a0b3e4e4590fb92b")
|
|
(f ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
|
|
(f ./fixed.builder2.sh "recursive" "sha1" "vw46m23bizj4n8afrc0fj19wrp7mj3c0")
|
|
];
|
|
|
|
# Expression to test that `nix-build --check` also throws an error if the hash of
|
|
# fixed-output derivation has changed even if the hash exists in the store (in this
|
|
# case the hash exists because of `fixed.builder2.sh`, but building a derivation
|
|
# with the same hash and a different result must throw an error).
|
|
check = [
|
|
(f ./fixed.builder1.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
|
|
];
|
|
|
|
good2 = [
|
|
# Yes, this looks fscked up: builder2 doesn't have that result.
|
|
# But Nix sees that an output with the desired hash already
|
|
# exists, and will refrain from building it.
|
|
(f ./fixed.builder2.sh "flat" "md5" "8ddd8be4b179a529afa5f2ffae4b9858")
|
|
];
|
|
|
|
sameAsAdd =
|
|
f ./fixed.builder2.sh "recursive" "sha256" "1ixr6yd3297ciyp9im522dfxpqbkhcw0pylkb2aab915278fqaik";
|
|
|
|
bad = [
|
|
(f ./fixed.builder1.sh "flat" "md5" "0ddd8be4b179a529afa5f2ffae4b9858")
|
|
];
|
|
|
|
reallyBad = [
|
|
# Hash too short, and not base-32 either.
|
|
(f ./fixed.builder1.sh "flat" "md5" "ddd8be4b179a529afa5f2ffae4b9858")
|
|
];
|
|
|
|
# Test for building two derivations in parallel that produce the
|
|
# same output path because they're fixed-output derivations.
|
|
parallelSame = [
|
|
(f2 "foo" ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
|
|
(f2 "bar" ./fixed.builder2.sh "recursive" "md5" "3670af73070fa14077ad74e0f5ea4e42")
|
|
];
|
|
|
|
}
|