Re: gnome-Session

[Lanoxx <lanoxx gmx net>]

On 27/01/13 09:02, Vincent Untz wrote:
> Le dimanche 27 janvier 2013, à 00:30 +0100, Lanoxx a écrit :
> > Hi,
> >
> > in the man page of gnome-session I cannot find any explanation or
> > reference about the following fields in a .session file:
> I guess it's best to look at
> /usr/share/gnome-session/sessions/gnome.session as an example if the man
> page doesn't cover this.
>
> > IsRunnableHelper and
> This is the path to a binary that is executed by gnome-session to know
> if the evaluated session can run or not. The exit value of the process
> is used for that.
>
> For instance, right now, we use
> @LIBEXECDIR@/gnome-session-check-accelerated that checks if hardware
> acceleration is available to determine if gnome-shell can run or not.
> (I guess this will change to allow llvmpipe in 3.8)
>
> > FallbackSession
> This is the name of the other session that will be used if the
> IsRunnableHelper test failed.
>
> For instance, in 3.6 and earlier, it was gnome-fallback as the fallback
> mode was used when hardware acceleration wasn't available.
>
> > DesktopName
> This is not used, not sure where you saw that.
On Ubuntu all the session files have such a line.
> > Additionally the man page mentions TASK in the context of required
> > and default providers, but does not explain that in more detail.
> >
> > Where do get more information about what these tasks and providers
> > are and what they reference? For example in one of my session files
> > I find these lines:
> >
> > RequiredProviders=windowmanager;
> > DefaultProvider-windowmanager=gnome-wm
> > DefaultProvider-notifications=notify-osd
> >
> > Who do I know what the TASKs windowmanager and notification are?
> > Under which circumstances could I add another line with some other
> > TASK and why would I want to do that?
> You can define anything as a task.
So what is a task used for and why whom? Does gnome-session just simply 
run any of the specified TASKs?
> The providers for a task are found in
> the .desktop files, thanks to the X-GNOME-Provides key. These .desktop
> files must either be in the autostart paths, or explicitly mentioned in
> DefaultProvider-TASK.
So there should exist a gnome-wm.desktop and notify-osd.desktop file 
somewhere, yes? Could you give me the exact path where I can find it?

Could I put a new line there and point it to any application's desktop 
file and it would get started, say for example anjuta?

DefaultProvider-anjuta=anjuta

Or have I misunderstood something here?
> Cheers,
>
> Vincent
Regards,
Lanoxx