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libfetchers: handle nonexistent refs in GitLab repos more gracefully

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Before:

$ nix flake lock --override-input nixpkgs gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent
fetching git input 'git+file:///home/linus/projects/lix'
fetching gitlab input 'gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent'
error: [json.exception.type_error.302] type must be string, but is null

After:

$ outputs/out/bin/nix flake lock --override-input nixpkgs gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent
fetching git input 'git+file:///home/linus/projects/lix'
fetching gitlab input 'gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent'
error:
       … while updating the lock file of flake 'git+file:///home/linus/projects/lix?ref=refs/heads/fix-gitlab-nonexistent&rev=915f16a619a36237a099b9aa9afed6d14ff613b4'

       … while updating the flake input 'nixpkgs'

       … while fetching the input 'gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent'

       error: No commits returned by GitLab API -- does the ref really exist?

Change-Id: Id9bc79d98348500e152ed519bb3ac79a3d15c38d
This commit is contained in:
Linus Heckemann 2024-05-30 23:20:42 +02:00
parent 2f104bbe3b
commit 3df013597d
1 changed files with 9 additions and 3 deletions
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12
src/libfetchers/github.cc
View file

@ -322,9 +322,15 @@ struct GitLabInputScheme : GitArchiveInputScheme
readFile(
store->toRealPath(
downloadFile(store, url, "source", false, headers).storePath)));
auto rev = Hash::parseAny(std::string(json[0]["id"]), htSHA1);
debug("HEAD revision for '%s' is %s", url, rev.gitRev());
return rev;
if (json.is_array() && json.size() == 1 && json[0]["id"] != nullptr) {
auto rev = Hash::parseAny(std::string(json[0]["id"]), htSHA1);
debug("HEAD revision for '%s' is %s", url, rev.gitRev());
return rev;
} else if (json.is_array() && json.size() == 0) {
throw Error("No commits returned by GitLab API -- does the ref really exist?");
} else {
throw Error("Didn't know what to do with response from GitLab: %s", json);
}
}
DownloadUrl getDownloadUrl(const Input & input) const override