[LightDM] session-cleanup-script on logout/reboot

[Andre Esser]

On 2014-05-01 17:40, tjoen wrote:
> On 01-05-14 13:14, Andre Esser wrote:
>> tjoen wrote:
>>> On 30-04-14 16:08, Andre Esser wrote:
>>>> I've created a script to back up the user's home directory
>>>> on logout by using the session-cleanup-script parameter in
>>>> lightdm.conf.
>>>>
>>>> This is working fine if the user only logs out without
>>>> restarting or shutting down the PC.
>>>> If the user shuts down or reboots the PC from their Gnome
>>>> session, the script is still called, but it appears the
>>>> shutdown process continues before the script terminates.
>>>> The script runs for about 5 seconds, then the PC powers
>>>> off/reboots.
>>>>
>>>> Is this the expected behaviour?
>>>>
>>>> Ubuntu 14.04 (lightdm 1.10.0)
>>> Which init is Ubuntu using? Upstart or systemd?
>>> I think easiest way is to add a wait in a stop-script.
>> Ubuntu 14.04 is still using Upstart. Any idea where that wait
>> needs to go? The backup script waits for user input (using
>> gdialog), so the wait has to come before the desktop session
>> terminates.
>>
> You can try first to put a poststop script/exec in /etc/init/lightdm.conf
> containing /bin/sleep 10
> If that is ignored by Upstart then you need to edit the Upstart killall
> configuration file
> I don't remember the exact syntax, only the principles of Upstart

The post-stop script in /etc/init/lightdm.conf worked in principle and
stopped the PC from shutting down too soon. Unfortunately that didn't
stop NFS shares from being unmounted, so my backup script still failed.
Tried to delay the NFS umount in a similar manner, but that caused the
PC to freeze on shutdown. Don't have any more time to look into this, so
giving up.

Thanks for your help though!

Andre