return false
    }

    static class AbortException extends RuntimeException {
    }

    static String showFileOnCommit(String commit, String filePath) {
        ExecResult execResult = exec("git show $commit:$filePath")
        if (execResult.returnCode != 0 && execResult.stderr ==~ /path '.*' exists on disk, but not in '.*'/) {
            println("File $filePath does not exist on commit $commit, skip.")