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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/fetchers.cc
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@ -34,9 +34,14 @@ std::unique_ptr<Input> inputFromAttrs(const Attrs & attrs)
for (auto & inputScheme : *inputSchemes) {
auto res = inputScheme->inputFromAttrs(attrs2);
if (res) {
if (auto narHash = maybeGetStrAttr(attrs, "narHash"))
// FIXME: require SRI hash.
res->narHash = Hash(*narHash);
if (auto narHash = maybeGetStrAttr(attrs, "narHash")) {
if (narHash->empty()) {
res->narHash = Hash(htUnknown);
printError("warning: found empty hash, assuming you wanted '%s'", res->narHash->to_string());
} else
// FIXME: require SRI hash.
res->narHash = Hash(*narHash);
}
return res;
}
}