Hello:

It would be nice to be able to restrict snapshots only to refs, both for sanity and for potential security reasons. E.g. see the "Security" section here:

https://git-scm.com/docs/git-upload-archive

My concern is mostly rogue crawlers that ignore robots.txt and try to request tarballs for each commit they find (doing HEAD, which appears to be enough to trigger full-blown response with tarball generation). At least if snapshot links were only generated for refs, that would reduce the impact.

In the meantime, this is easy enough to restrict via the http server, but this is not the best UX if links are listed, but clicking on them results in an error message.

Perhaps some setting like "snapshots-refsonly: 0/1"

Best,
-K
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