forked from lix-project/lix
Allow empty hash in derivations
follow up of https://github.com/NixOS/nix/pull/3544 This allows hash="" so that it can be used for debugging purposes. For instance, this gives you an error message like: warning: found empty hash, assuming you wanted 'sha256:0000000000000000000000000000000000000000000000000000' hash mismatch in fixed-output derivation '/nix/store/asx6qw1r1xk6iak6y6jph4n58h4hdmbm-nix': wanted: sha256:0000000000000000000000000000000000000000000000000000 got: sha256:0fpfhipl9v1mfzw2ffmxiyyzqwlkvww22bh9wcy4qrfslb4jm429
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@ -719,7 +719,13 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
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throw Error(format("multiple outputs are not supported in fixed-output derivations, at %1%") % posDrvName);
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HashType ht = outputHashAlgo.empty() ? htUnknown : parseHashType(outputHashAlgo);
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Hash h(*outputHash, ht);
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Hash h;
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if (outputHash->empty()) {
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h = Hash(ht);
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printError("warning: found empty hash, assuming you wanted '%s'", h.to_string());
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} else
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h = Hash(*outputHash, ht);
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auto outPath = state.store->makeFixedOutputPath(ingestionMethod, h, drvName);
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if (!jsonObject) drv.env["out"] = state.store->printStorePath(outPath);
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