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诊断 rsync 为何复制或不复制某些文件

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诊断 rsync 为何复制或不复制某些文件

我有一个脚本，用于rsync从远程服务器获取文件，然后处理它们。这些本地副本在运行之间不会被删除，因此rsync只需获取新的文件。但是，似乎rsync每次都会下载每个文件，即使缓存的本地副本和服务器副本都没有改变，我也知道为什么。

是否有一些命令行参数rsync可以帮助我诊断为什么在本次运行中复制或不复制给定文件？我试过了-v，但它似乎没有给我所需的信息。类似的东西：

> rsync --diagnose-why-files-copied remotehost:/remote/path ./local/path/
'remotehost:/remote/path/file1':
  Destination file './local/path/file1' does not exist; copying.

'remotehost:/remote/path/file2':
  Destination file './local/path/file2' exists...
  Destination file size does not match source file size; copying.

'remotehost:/remote/path/file3':
  Destination file './local/path/file3' exists...
  File sizes match...
  Destination file modification date does not match source file modification date; copying.

'remotehost:/remote/path/file4':
  Destination file './local/path/file4' exists...
  File sizes match...
  File modification dates match...
  No change detected; skipping.

> rsync -c --diagnose-why-files-copied remotehost:/remote/path2 ./local/path2/
'remotehost:/remote/path2/file1':
  Destination file './local/path2/file1' does not exist; copying.

'remotehost:/remote/path2/file2':
  Destination file './local/path2/file2' exists...
  Destination file checksum does not match source file checksum; copying.

'remotehost:/remote/path2/file3':
  Destination file './local/path2/file3' exists...
  File checksums match...
  No change detected; skipping.

答案1

-ii正是我想要的。该--itemize-changes选项的缩写形式-i会打印出每个更新或更改的文件的诊断消息，指明对该文件做了什么以及为什么这样做。指定该选项两次还会打印未更改的文件的消息。

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