# File lib/grit/git.rb, line 187
    def raw_git_call(command, index)
      tmp = ENV['GIT_INDEX_FILE']
      ENV['GIT_INDEX_FILE'] = index
      out = `#{command}`
      after = ENV['GIT_INDEX_FILE'] # someone fucking with us ??
      ENV['GIT_INDEX_FILE'] = tmp
      if after != index
        raise 'environment was changed for the git call'
      end
      [out, $?.exitstatus]
    end