How do I find if a git SHA points to a branch HEAD?
To avoid unnecessarily detached HEADs when checking out a certain git SHA with a (python) script, I'd like to check out a branch instead, if that SHA happens to be the current HEAD of a branch.
Ideally, I want to feed git an SHA, and it returns a branch name if the SHA is on a branch's current tip, or error out if not.
git describe --all --exact-match <SHA> very nearly is what I need, only that it is primarily aimed at tags, and so if a branch and a tag point at my SHA (which often happens in our release branches, for example), only the tag is given. This is not useful, because checking out the tag leads to a detached HEAD (even if a branch points at the same SHA).
Note, I don't want to do
git branch --contains - I don't need to know which branches contain my commit.
If there's no command like
git describe, just for branches, I know I can cross-check my SHA against branch SHAs via
git show-ref. That's not the most elegant solution, though.
I could also do
git name-rev --name-only <hash>, but I'd have to manually check the output for
~ characters, which feels unelegant if there's a git command somewhere to do the same thing.
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