☰

rsync --compare-dest 不起作用

tag-icon • tag-icon rsync
rsync --compare-dest 不起作用

我有这些目录SRC，，DST：COMPARE

  • /opt/SRC

    file1
file2
file3

  • /opt/DST

    file1
file2

  • /opt/COMPARE

    空的

我希望：

$ ls /opt/COMPARE
file3

但是当我跑步时：

rsync -avz --compare-dest=/opt/COMPARE /opt/SRC/ /opt/DST

该/opt/COMPARE目录还是空的，为什么？

答案1

我认为您的应用方式--compare-dest不正确。

从man rsync

   --compare-dest=DIR
          This option instructs rsync to use DIR on the destination machine as an  additional
          hierarchy  to  compare  destination files against doing transfers (if the files are
          missing in the destination directory).  If a file is found in DIR that is identical
          to  the  sender’s  file, the file will NOT be transferred to the destination direc‐
          tory.  This is useful for creating a sparse backup of just files that have  changed
          from  an  earlier  backup.  This option is typically used to copy into an empty (or
          newly created) directory.

         Beginning in version 2.6.4, multiple --compare-dest directories  may  be  provided,
          which  will  cause  rsync  to  search  the list in the order specified for an exact
          match.  If a match is found that differs only in attributes, a local copy  is  made
          and  the attributes updated.  If a match is not found, a basis file from one of the
          DIRs will be selected to try to speed up the transfer.

         If DIR is a relative path, it is relative to the destination directory.   See  also
          --copy-dest and --link-dest.

         NOTE:  beginning with version 3.1.0, rsync will remove a file from a non-empty des‐
          tination hierarchy if an exact match is found in one of  the  compare-dest  hierar‐
          chies (making the end result more closely match a fresh copy).

如果我没看错的话，--compare-dest过去常常停止发送某些文件。这将允许您创建一个新的复制目标目录，其中仅包含自上次复制以来已更改的文件。如果您愿意的话，这可以说是一种增量复制。

答案2

  1. rsync 会将 /opt/SRC 中的文件与 /opt/COMPARE 中的文件进行比较。如果文件存在于 /opt/SRC 中而不存在 /opt/COMPARE 中，或者两者中存在不同版本，则会将其复制到 /opt/DST。
  2. rsync 不仅在决定文件是否“相同”时检查内容。为了使其正常工作，您有时应该使用诸如“--no-times”（这个对我有用）或“--no-perms”、“--no-owner”、“--no-group”、“--checksum”等标志。
  3. 使用“--dry-run”来测试行为是一个好主意，而无需实际复制。

相关内容