*Branch* functions of Repository are just manipulating .git/config so...

[lkxed]

If you want to check whether a local branch exists, you DON'T call Repository.Branch(name string) which returns a *config.Branch representing a branch in .git/config, which is a dead end.

Instead, you NEED to call Repository.Branchs() which returns a storer.ReferenceIter. Then you can call its ForEach to iterate and compare every Reference.Name() to get the result you want.

Here is an example:

func hasLocalBranch(branch string) bool {
	name := plumbing.NewBranchReferenceName(branch)
	return hasBranch(name)
}

func hasBranch(name plumbing.ReferenceName) bool {
	var exist bool
	if iter, err := repository.Branches(); err == nil {
		iterFunc := func(reference *plumbing.Reference) error {
			if name == reference.Name() {
				exist = true
				return nil
			}
			return nil
		}
		_ = iter.ForEach(iterFunc)
	}
	return exist
}

It took me a while to figure this out. Hope it helps.