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---
synopsis: restore backwards-compatibility of `builtins.fetchGit` with Nix 2.3
issues: [5291, 5128]
credits: [ma27]
category: Fixes
---
Compatibility with `builtins.fetchGit` from Nix 2.3 has been restored as follows:
* Until now, each `ref` was prefixed with `refs/heads` unless it starts with `refs/` itself.
Now, this is not done if the `ref` looks like a commit hash.
* Specifying `builtins.fetchGit { ref = "a-tag"; /* … */ }` was broken because `refs/heads` was appended.
Now, the fetcher doesn't turn a ref into `refs/heads/ref`, but into `refs/*/ref`. That way,
the value in `ref` can be either a tag or a branch.
* The ref resolution happens the same way as in git:
* If `refs/ref` exists, it's used.
* If a tag `refs/tags/ref` exists, it's used.
* If a branch `refs/heads/ref` exists, it's used.
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