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Merge pull request 'Add an immutable tarball link to archive download headers for Nix' (#3615) from jadeprime/forgejo:jade/nix-tarball-link into forgejo

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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/3615
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
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Earl Warren 2024-05-04 07:01:02 +00:00
commit c9624d4cdb
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Support the [Nix tarball fetcher immutable link protocol](https://github.com/nixos/nix/blob/56763ff918eb308db23080e560ed2ea3e00c80a7/doc/manual/src/protocols/tarball-fetcher.md) on archive URLs, so Forgejo-generated tarballs for branches will go into Nix's `flake.lock` as their respective commit URLs and `nix flake update` will just work. This allows natively fetching Forgejo repositories for Nix flake inputs as tarballs rather than as Git repositories, significantly improving fetch times and avoiding depending on Git at runtime.
Concretely, Forgejo now returns a header of the following format from its archive URLs: `Link: <https://my-forgejo/api/v1/someuser/somerepo/archive/some-commit-hash.tar.gz?rev=some-commit-hash> rel="immutable"`.
Example usage: `inputs.meow.url = "https://my-forgejo/someuser/somerepo/archive/main.tar.gz";` in `flake.nix`. For a private repository, configure `netrc-file` in `nix.conf` and use `https://my-forgejo/api/v1/repos/someuser/somerepo/archive/main.tar.gz` as a URL instead, since the normal archive endpoint doesn't support tokens.