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Support empty hash in fetchers

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fetchTarball, fetchTree, and fetchGit all have *optional* hash attrs.
This means that we need to be careful with what we allow to avoid
accidentally making these defaults. When ‘hash = ""’ we assume the
empty hash is wanted.
This commit is contained in:
Matthew Bauer 2020-06-09 11:10:54 -05:00
parent 762273f1fd
commit 19aa892f20
4 changed files with 32 additions and 12 deletions
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11
src/libexpr/primops.cc
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@ -1131,9 +1131,14 @@ static void prim_path(EvalState & state, const Pos & pos, Value * * args, Value
filterFun = attr.value;
} else if (n == "recursive")
method = FileIngestionMethod { state.forceBool(*attr.value, *attr.pos) };
else if (n == "sha256")
expectedHash = Hash(state.forceStringNoCtx(*attr.value, *attr.pos), htSHA256);
else
else if (n == "sha256") {
auto hashStr = state.forceStringNoCtx(*attr.value, *attr.pos);
if (hashStr == "") {
expectedHash = Hash(htSHA256);
printError("warning: found empty hash, assuming you wanted '%s'", expectedHash.to_string());
} else
expectedHash = Hash(hashStr, htSHA256);
} else
throw EvalError(format("unsupported argument '%1%' to 'addPath', at %2%") % attr.name % *attr.pos);
}
if (path.empty())