# File lib/r10k/git/repository.rb, line 67
  def resolve_remote_head(pattern, remote = 'origin')
    pattern = "refs/remotes/#{remote}/#{pattern}"
    output = git ['show-ref', '-s', pattern], :git_dir => git_dir, :raise_on_fail => false

    if output.success?
      output.stdout.lines.first
    end
  end