I have achieved a reasonable preprocessing of files before pushing them to the remote server (for instance, compressing or encrypting the files) using perlrsync (in the source) and rsync (destination).
I tried patching the rsync sources, but it's obviously non-trivial and I am obviously not a capable C coder. When I found perlrsync and could see that it's wire-compatible with rsync I decided to patch the perl libs instead.
The resulting patches and wrapper script I hope to integrate soon with perlrsync, which can be found at http://perlrsync.sourceforge.net/ .
While this is probably off-topic for the rsync list, I hope it helps users who are looking for this functionality in rsync.
As a sidenote, when dealing with filtering that changes the filesize, the patch implementing --ignore-size/--time-only (by Kyle Jones) seems to be useful to avoid resending unchanged files.
regards,
martin
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