tar czvf test.tar test.log --warning=no-file-changed
tar の “file changed as we read it” エラーの回避方法 | キュア子の開発ブログ 2015
If the tar util see the file/folder changed it exits with error code "1", see http://www.gnu.org/software/tar/manual/html_section/tar_19.html#Synopsis.
So the whole Gitlab backup procedure fails. If we add the --warning=no-file-changed option to tar - the error suppressed by exit code is still 1.
