rsync - Jan 2014 - [Bug 10405] New: Feature request: Add support for pre/post cmds for the rsync client

https://bugzilla.samba.org/show_bug.cgi?id=10405

           Summary: Feature request: Add support for pre/post cmds for the
                    rsync client
           Product: rsync
           Version: 3.1.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: core
        AssignedTo: wayned at samba.org
        ReportedBy: idl0r at qasl.de
         QAContact: rsync-qa at samba.org


Hi,

it would be really useful to have some kind of --pre-cmd/--post-cmd and esp.
more advanced like --post-cmd-fail, --post-cmd-success.
rsync should then execute the passed scripts and (add a command for it as
well?) it should also pass the list of transfered (all), failed or successfully
transfered files/dirs.
A control option for it could e.g. look like --cmd-pass=[0|1|2|3] where:
0 = disabled, nothing passed at all
1 = only successfully transfered objects
2 = only failed
3 = any

That would make rsync almost perfect and one could easily take care of
different situations without having to parse the complete output of rsync. It
shouldn't be that difficult actually, esp. basic pre/post cmds.

I'd perhaps even try to write a patch that adds the mentioned features (in
case
I get to it).

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https://bugzilla.samba.org/show_bug.cgi?id=10405

--- Comment #1 from Kevin Korb <rsync at sanitarium.net> 2014-01-29
21:57:03 UTC ---
Personally, I wouldn't have any use for the processing of the output part
but a
pre and post command to create and destroy lvm2 snapshots would be useful. 
Especially in keeping rsync from attempting to backup an empty mountpoint if
the snapshot fails.

Yes, this can be handled in a script but it would be easier if rsync handled it
internally especially if using a restricted ssh key for access to the system
being backed up.

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--- Comment #2 from roland <devzero at web.de> 2014-08-06 21:45:38 UTC ---
regarding restricted ssh - wouldn`t that be a security nightmare if rsync could
exec any additional command ?

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--- Comment #3 from Christian Ruppert <idl0r at qasl.de> 2014-08-07
19:17:22 UTC ---
(In reply to comment #2)
> regarding restricted ssh - wouldn`t that be a security nightmare if rsync
could
> exec any additional command ?
At least my idea is meant to be client side only.

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