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64519cfd65
SHA-256 outputs of fixed-output derivations. I.e. they now produce
the same store path:
$ nix-store --add x
/nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x
$ nix-store --add-fixed --recursive sha256 x
/nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x
the latter being the same as the path that a derivation
derivation {
name = "x";
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = "...";
...
};
produces.
This does change the output path for such fixed-output derivations.
Fortunately they are quite rare. The most common use is fetchsvn
calls with SHA-256 hashes. (There are a handful of those is
Nixpkgs, mostly unstable development packages.)
* Documented the computation of store paths (in store-api.cc).
51 lines
1.6 KiB
Nix
51 lines
1.6 KiB
Nix
rec {
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f2 = dummy: builder: mode: algo: hash: derivation {
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name = "fixed";
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system = "@system@";
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builder = "@shell@";
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args = ["-e" "-x" builder];
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outputHashMode = mode;
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outputHashAlgo = algo;
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outputHash = hash;
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PATH = "@testPath@";
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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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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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