[fdo] Detect my own session being closed

[Sergio Costas]

No, that's not how it works: it is launched automatically when the user 
enters its session, as a program launched by the user. The idea is to 
ensure that it has access only to the files of their user.

El 6/2/20 a las 15:38, Ryan escribió:
> D-Bus exists for this. Given you want, wouldn't you still run into the 
> problem of your app then needing to persist across multiple user 
> sessions in order to remount everything? You can't really do that 
> reliably without a system service.
>
> On Thu, Feb 6, 2020, 7:10 AM Sergio Costas <rastersoft at gmail.com 
> <mailto:rastersoft at gmail.com>> wrote:
>
>     The problem is that I don't want to have a system service, because
>     I would also need a communication protocol, an arbitration
>     algorithm... I think that there should be an API in logind that
>     would allow a program to block the logout the same than it allows
>     to block shutdown and reboot, and being notified of that. In fact,
>     sometimes I receive a notification in Gnome Shell telling me that
>     Thunderbird is still running and can't close the session... How
>     can I do that? (if it also allows me to detect it and do what I
>     want, of course).
>
>     El 6/2/20 a las 6:49, Ryan escribió:
>>     I think what you really want is a system service that talks to
>>     your backup app. That way, it can run across user sessions, thus
>>     being able to detect session opening, leaving, etc.
>>
>>     On Wed, Feb 5, 2020, 10:55 AM Rastersoft <rastersoft at gmail.com
>>     <mailto:rastersoft at gmail.com>> wrote:
>>
>>         Hello:
>>
>>         I created a backup program that uses an external HD to do the
>>         backups, and it is designed to allow several users to share
>>         the same hard disk by storing each backup in a different
>>         folder. To ensure that the backups are always made, it
>>         automatically mounts the backup hard disk when it detects it
>>         (using udisk2 DBus interface). The first problem is that if
>>         the backup program of the user A mounts the disk, only user A
>>         can access it. The second problem is that, if user closes its
>>         session as user A and opens a new session as user B, the
>>         external hard disk is still mounted as the user A, so the
>>         backup program of user B can't access it unless user B
>>         manually unmounts it.
>>
>>         My questions are:
>>
>>         - Is it possible to mount an external hard disk, using
>>         udisk2, making it accessible for all the users?
>>         - If not, is it possible to mark a mounted partition as
>>         "umount on session close"?
>>         - If not, is it possible to detect when my session is being
>>         closed, to make the backup program to umount the partition,
>>         thus allowing other users to use it?
>>
>>         About this last question: I already tried to connect to the
>>         SessionRemoved signal from logind, but with no luck: I
>>         receive the signal when other users close their session, but
>>         my program is killed before it can process the signal. Also I
>>         tried to use onexit(), atexit(), and GApplication's close
>>         signals, but also with no luck: the code isn't  called (I'm
>>         using GTK, and the program always dies with a 'broken pipe'
>>         message when the session is closed).
>>
>>         Thanks in advance.
>>
>>         -- 
>>         Nos leemos
>>                          RASTER    (Linux user #228804)
>>         raster at rastersoft.com <mailto:raster at rastersoft.com>
>>         http://www.rastersoft.com
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>>         <mailto:freedesktop at lists.freedesktop.org>
>>         https://lists.freedesktop.org/mailman/listinfo/freedesktop
>>
>
>     -- 
>     Nos leemos
>     		         RASTER    (Linux user #228804)
>     raster at rastersoft.com  <mailto:raster at rastersoft.com>               http://www.rastersoft.com
>
>     _______________________________________________
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>     <mailto:freedesktop at lists.freedesktop.org>
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>

-- 
Nos leemos
		         RASTER    (Linux user #228804)
raster at rastersoft.com              http://www.rastersoft.com

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