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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/libfetchers/tarball.cc
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@ -263,9 +263,14 @@ struct TarballInputScheme : InputScheme
throw Error("unsupported tarball input attribute '%s'", name);
auto input = std::make_unique<TarballInput>(parseURL(getStrAttr(attrs, "url")));
if (auto hash = maybeGetStrAttr(attrs, "hash"))
// FIXME: require SRI hash.
input->hash = Hash(*hash);
if (auto hash = maybeGetStrAttr(attrs, "hash")) {
if (hash->empty()) {
input->hash = Hash(htUnknown);
printError("warning: found empty hash, assuming you wanted '%s'", input->hash->to_string());
} else
// FIXME: require SRI hash.
input->hash = Hash(*hash);
}
return input;
}