find remote reference when HEAD detached

[gnalh]

Scan the references to find the matching reference name. This is equivalent to git for-each-ref --contains e0c6eaa19870c1ae30601bed5bee604c7436c9a2

After:

2024-04-08T05:37:42 [INFO] - Found git_sha: Some("e0c6eaa19870c1ae30601bed5bee604c7436c9a2")
2024-04-08T05:37:42 [INFO] - Found git_branch: Some("refs/remotes/pull/47/merge")

Before

2024-04-08T05:39:17 [INFO] - Found git_sha: Some("e0c6eaa19870c1ae30601bed5bee604c7436c9a2")
2024-04-08T05:39:17 [INFO] - Found git_branch: None

Repro:

git -c protocol.version=2 fetch --no-tags --prune --no-recurse-submodules --depth=1 origin +e0c6eaa19870c1ae30601bed5bee604c7436c9a2:refs/remotes/pull/47/merge
git checkout --progress --force refs/remotes/pull/47/merge

[gnalh]

I'm sure there's a more elegant solution here. If there is, any pointers would be greatly appreciated.

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[riya-n]

Looks good, but not sure we need to match or warn. Just a suggestion, but we could do something like this as well

if git_head_branch.is_none() {
  for rb in git_repo.references()?.remote_branches()? {
    git_head_branch = rb.map_or(None, |r| {
      let id = r.target().try_id().map(|id| id.to_string());
      let git_head_id = git_head.id().map(|id| id.to_string());
      if id.is_some() && git_head_id.is_some() && id == git_head_id {
        return r.name().to_path().to_str().map(|s| s.to_string());
      }
      None
    });
  }
}