lib/omnibus/fetchers/git_fetcher.rb
def current_revision
      cmd = git("rev-parse HEAD")
      cmd.stdout.strip
    rescue CommandFailed
      log.debug(log_key) { "unable to determine current revision" }
      nil
    end
def current_revision
      cmd = git("rev-parse HEAD")
      cmd.stdout.strip
    rescue CommandFailed
      log.debug(log_key) { "unable to determine current revision" }
      nil
    end
The current revision for the cloned checkout.

 @return [String]