Can't clone branch ref name with hash/number sign (#)

[jkblume]

I am cloning a repository in single branch mode with a branch name that contains a hash/number sign (#) into name. And get an error.

Steps to reproduce (created a public github repository for that):

	_, err := git.PlainClone("/tmp/repo", false, &git.CloneOptions{
		URL:           "git@github.com:jkblume/gogit-hashtag-bug.git",
		ReferenceName: plumbing.ReferenceName("refs/heads/branch#name"),
		SingleBranch:  true,
	})

	fmt.Println(err.Error())

The command fails with error message: 'malformed refspec, separators are wrong' in file config/refspec.go line 35. I take a little deep dive into the code and debugged it. It seems, that in gcfg/scanner/scanner.go the hashtag sign is interpreted as comment sign.