# File lib/new_relic/recipes/capistrano_legacy.rb, line 55
    def lookup_changelog(changelog)
      if !changelog
        logger.debug "Getting log of changes for New Relic Deployment details"
        from_revision = source.next_revision(current_revision)

        if scm == :git
          log_command = "git --no-pager log --no-color --pretty=format:'  * %an: %s' " +
            "--abbrev-commit --no-merges #{previous_revision}..#{real_revision}"
        else
          log_command = "#{source.log(from_revision)}"
        end

        changelog = `#{log_command}`
      end
      changelog
    end