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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:

/tmp/inst/bin/nix flake lock --override-input nixpkgs gitlab:simple-nixos-mailserver/nixos-mailserver/nonexistent

warning: unknown experimental feature 'repl-flake'
error:
       … while updating the lock file of flake 'git+file:///home/joerg/git/nix?ref=refs/heads/master&rev=62693c2c37c8edd92f95114eb1387b461fc671df'

       … 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 git ref really exist?

Adapted from: 3df013597d
This commit is contained in:
Linus Heckemann 2024-05-30 23:20:42 +02:00 committed by Jörg Thalheim
parent ef5c846e25
commit a9031978da
1 changed files with 9 additions and 3 deletions
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12
src/libfetchers/github.cc
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@ -433,9 +433,15 @@ struct GitLabInputScheme : GitArchiveInputScheme
store->toRealPath(
downloadFile(store, url, "source", headers).storePath)));
return RefInfo {
.rev = Hash::parseAny(std::string(json[0]["id"]), HashAlgorithm::SHA1)
};
if (json.is_array() && json.size() == 1 && json[0]["id"] != nullptr) {
return RefInfo {
.rev = Hash::parseAny(std::string(json[0]["id"]), HashAlgorithm::SHA1)
};
} if (json.is_array() && json.size() == 0) {
throw Error("No commits returned by GitLab API -- does the git ref really exist?");
} else {
throw Error("Unexpected response received from GitLab: %s", json);
}
}
DownloadUrl getDownloadUrl(const Input & input) const override