Re: shell wrapper to set ioctls before & after a command execution?

On Thu, 6 Jun 2013, Robert Goley wrote:

> That sounds like a good idea but you would need to blacklist the PIDs of the
> commands called from your backup script as well.  Most likely, they are the
> processes opening all of the files to start with.  You might want to look at
> using a python script for your backup script so you can more easily capture
> the PIDs of the executed commands.  

Actually, I use backuppc, which in turn just uses rsync (with a lot of
options). So it just gets down to substituting vanilla rsync with a wrapped
rsync. But in general, yes, you are completely right. So far, I came up with
this (generic) wrapper script:

#! /bin/bash
CACHEDEVICES="/dev/mapper/capitanatacache"

$* &

mypid=$!

for dev in ${CACHEDEVICES} ; do flashcache_setioctl -a -b ${mypid} ${dev} ; done
wait ${mypid}
exitcode=$?
for dev in ${CACHEDEVICES} ; do flashcache_setioctl -r -b ${mypid} ${dev} ; done

exit ${exitcode}

Now I have to implement it through my updatedb (and similar) cron jobs, and
my backup system.

Ciao
Giacomo

-- 
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Giacomo Mulas <[email protected]>
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