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正确性测试脚本

测试

完成一个正确性测试的脚本:correct.sh。
输入 ./correct.sh evenodd
然后执行下面功能:

  • 在该目录进行 N 次文件编码、解码;错误恢复等测试:
    • 比如:
      1. 创建一个大小为 file_size 的文件 test_file,然后选择一个质数 p 对它执行 ./evenodd write test_file 编码
      1. 对 test_file 恢复读,即执行 ./evenodd read test_file test_file.read,然后比较 test_file 和 test_file.read 是否相同
      1. 故障读测试:随机删除 disk_{0,p+1} 下的 test_file(不超过2个),然后恢复读,读出 test_file.read 和 test_file 比较。
  • 注意:
    • 测试的时候,文件大小范围要全,比如 1KiB - GiB
    • 质数 p 的选择根据文件大小相应增大减少 @wangyaning45

编解码正确性似乎有点问题,取出来的文件会少一些字节

在项目根目录运行这个脚本:

#!/bin/sh

sh compile.sh
cp /usr/bin/ls ls.orig
cp ls.orig ls
cnt=0
while diff ls.orig ls; do
    ./evenodd write ls.orig 31
    rm -rf disk_9
    ./evenodd repair 1 9
    ./evenodd read ls.orig ls
    cnt=$((cnt + 1))
done
echo error detected after "$cnt" runs

这个脚本会重复执行以下过程:

  • p=31 存入文件 ls
  • 毁掉第 9 个磁盘
  • 修复第 9 个磁盘
  • ls 读出来,并且与原始文件比较

正常情况应该是脚本不退出,且 ls 和 ls.orig 始终一致。但是本项目中,这个脚本会在循环 1 至 2 次后退出。检查 ls 和 ls.orig 文件会发现,取出来的 ls 前面部分和 ls.orig 一致,尾部丢失了一些字节……


代码跑得真的很快,谢谢大佬的分享 <3

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