PIPE

Seems to be the answer. Adding PIPE to the list of signals trapped by 
the script causes it to clean up on exit when the job is killed from the 
web interface.

trap "cleanup ; trap - INT ; kill -INT $$" INT
trap "cleanup ; exit $?" TERM ABRT ALRM PIPE

is the snippet that works. cleanup is a function that removes the 
<hostname>.html file and returns an appropriate error value.

Russ Poyner


On 07/24/14 14:36, Russell R Poyner wrote:
> I have a bash script that runs on the BackupPC server as DumpPreUserCmd.
>
> I'd like to have the script catch a signal and clean up it's files if a
> backup get's canceled while the script is running. So far I'm trapping
> INT, TERM, ABRT and ALRM but not getting what I want.
>
> Does BackupPC send SIGKILL to the DumpPreUserCmd process? Or something
> else I haven't thought of?
>
> The value of $Conf{UserCmdCheckStatus} seems to not matter.
>
> Background:
>
> This is in the context of a method to create shadow copies and start
> rsyncd on windows clients without having to remotely execute anything on
> the windows box via ssh or winexe.
>
> 1. The server starts our DumpPreUserCmd bash script which creates a file
> called <hostname>.html in a web-readable directory. It then polls the
> windows machine to see if rsyncd has started. Once windows starts it's
> rsyncd the PreUser script exits so that the dump can start.
>
> 2. The windows machine runs a script in task_scheduler every 5 minutes
> to see if the file <hostname>.html exists in the special directory on
> the BackupPC web server. If it does the windows box runs a powershell
> script that creates shadow copies, starts rsyncd and opens a firewall
> hole to allow the backup.
>
> 3. On the server when the dump completes DumpPostUserCmd runs and
> removes the <hostname>.html file.
>
> 4. When the periodic task on the windows machine no longer finds the
> <hostname>.html file it stops the rsyncd service, deletes the shadow
> copies, and closes the firewall hole.
>
> It works fine unless the backup get's interupted while DumpPreUserCmd is
> running and waiting for windows to start it's rsyncd service. In that
> case the <hostname>.html file get's orphaned.
>
> I *could* create a cron job on the server to look for and remove
> orphaned <hostname>.html files, but I'm hoping to not need that.
>
> Thanks
> Russ Poyner
>
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