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

Wasn't sure it had been thought out.  Thought you were doing a single
backup script expecting blacklisting the single PID to work.  The method
you have should work great.


On Thu, Jun 6, 2013 at 12:55 PM, Giacomo Mulas
<[email protected]>wrote:

> 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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