Guillermo Rozas wrote at about 22:37:09 -0300 on Wednesday, February 16, 2022: > > > > > Certainly, this would be more bandwidth-friendly if it was possible to > > > do this compression before transferring to server, but I can't figure > > > out how I could accomplish this. > > Presumably harder as it would require host-side code to do things > > such as running a patched host version of rsync (or other transfer > > method executable) > > > > I think you can achieve this by running a wrapper script on the client and > tying its execution to the BackupPC key. The steps would be: > > - generate a key to use by the rsync/ssh connection from BackupPC and > nothing else (you should do this for security reasons anyway) > - on the client's authorized_keys file, use the "command" option to execute > a script every time a connection from this key is made. This command will > run instead of the rsync command BackupPC wants to run, and the latter will > be saved in the SSH_ORIGINAL_COMMAND variable > - in this script, pipe in some way your compression process into the rsync > command sent originally by BackupPC > > This is the method the rrsync [1] script uses to restrict rsync to a > certain folder and options (I'm actually using a modified version of it > with BackupPC). The hard part is to figure out the third point above... >
To do what you are suggesting, you don't need to play with the authorized_key file... you can just set Conf{RsyncClientPath} to whatever new version of rsync you have written. But I really don't see how your suggestion solves anything... Unless you want to re-write the guts of rsync on the client side (similar to what Craig has done with rsync_bpc on the server side, I don't see how you can pre-process files on the client side. Even if you did somehow pre-compress files and pipe them onto the client side rsync, you would probably break the ability for rsync to tell changed files based on stat'ing the file size... Unless I am missing something... _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: https://github.com/backuppc/backuppc/wiki Project: https://backuppc.github.io/backuppc/