if (args.length != 1) {
            System.err.println("Usage: groovy CheckBadMerge.groovy <commits_file>")
            System.exit(1)
        }

        List<String> commits = Files.readAllLines(Paths.get(args[0]))
        try {
            commits.each { checkCommit(it) }
        } finally {
            THREAD_POOL.shutdown()
        }
    }

    static void checkCommit(String commit) {