rsync 忽略所有者、组、时间和权限

Question

我想知道如何使用 rsync 递归同步到文件夹，但我只需要更新新文件或更新的文件（仅内容，而不是所有者、组或时间戳），并且我想删除源中不存在的文件.

Answer 1

我想你可以使用-no-选项rsync来不复制的所有权或文件你正在同步的权限。

摘自 rsync 手册页

--no-OPTION
       You may turn off one or more implied options by prefixing the option 
       name with "no-".  Not all options may be pre?fixed  with  a  "no-":  
       only options that are implied by other options (e.g. --no-D, 
       --no-perms) or have different defaults in various circumstances (e.g. 
       --no-whole-file, --no-blocking-io, --no-dirs).  You may specify 
       either the short or the long option name after the "no-" prefix (e.g. 
       --no-R is the same as --no-relative).

       For example: if you want to use -a (--archive) but don’t want -o 
       (--owner), instead of converting -a into -rlptgD, you could specify 
       -a --no-o (or -a --no-owner).

       The order of the options is important:  if you specify --no-r -a, the 
       -r option would end up being turned on,  the opposite  of  -a  
       --no-r.   Note  also  that the side-effects of the --files-from 
       option are NOT positional, as it affects the default state of several 
       options and slightly changes the meaning of -a (see the  --files-from
       option for more details).

所有权和权限

查看手册页，我相信您会想要使用以下内容：

$ rsync -avz --no-perms --no-owner --no-group ...

要删除不存在的文件，您可以使用--delete开关：

$ rsync -avz --no-perms --no-owner --no-group --delete ....

时间戳

As for the timestamp I don't see a way to keep this without altering how you'd do the comparison of SOURCE vs. DEST files. You might want to tell rsync to ignore timestamps using this switch:

-I, --ignore-times
       Normally  rsync will skip any files that are already the same size 
       and have the same modification timestamp.  This option turns off this 
       "quick check" behavior, causing all files to be updated.

Update

For timestamps, --no-times might do what you're looking for.

Answer 2

我认为避免-a选项更容易

$ -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)

并只设置您想要的选项。

如果您喜欢所有选项，但不喜欢 user -o、 group -g、 time -t和 permissions -p的修改，那么您可以从存档等效项中减去这四个选项。

$ -rlD

要删除目标文件，请使用选项--delete。

对于您的问题：但我认为将检查所有文件 - rsync 无法仅传输/检查仅由内容更改的文件。

Answer 3

我认为您正在寻找的是选项

rsync -r --size-only

从手册页：

--size-only
   This  modifies  rsync’s  "quick  check" algorithm for finding files
   that  need  to  be  transferred,  changing  it  from the default of
   transferring  files   with  either  a  changed  size  or a  changed
   last-modified  time  to just looking for files that have changed in 
   size. This is useful when starting to use rsync after using another
   mirroring system which may not preserve timestamps exactly.

如果您真的想删除源目录中丢失的文件，请使用--delete.

Answer 4

您可以强制 rsync 忽略基于文件修改时间和大小的检查，并使用带有“-c”开关的基于 chksum 的方法。

-c, --checksum              skip based on checksum, not mod-time & size

这确实意味着无论文件时间和大小是否匹配，它都需要以块的形式比较整个文件（并在源和目标之间来回传输相关元数据以实现这一点），但只会传输不同的块源和目标之间。

将此开关与其他人建议的其他开关结合使用应限制复制的内容（仅复制已更改的内容），并且具有在源和目标之间进行一致性检查的好处，但根据您的链接速度，它确实需要更长的时间它必须对双方的文件块进行 chksum 和比较）。