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Re: Activating gnome-screensaver from /etc/acpi/sleepbtn.sh



On Fri, May 04, 2007 at 01:32:02AM +0200, Marcus Libäck wrote:
> Hello,
> 
> I'm trying to activate gnome-screensaver from /etc/acpi/sleepbtn.sh so
> that the screen is locked when I resume the laptop. With xscreensaver it just
> seems to be a matter of running something like:
> # su $user -c "xscreensaver-command -lock"
> 
> But with the gnome-screensaver equivalence I get the following error:
> 
> # su $user -c "gnome-screensaver-command --lock"
> gnome-screensaver-Message: Failed to connect to the D-BUS daemon: Failed
> to execute dbus-launch to autolaunch D-Bus session
> 
> It also fails if I try to send a DBus message:
> # su $user -c "dbus-send --session \
>                --dest=org.gnome.ScreenSaver \
>                --type=method_call \
>                --print-reply \
>                --reply-timeout=20000 \
>                /org/gnome/ScreenSaver \
>                org.gnome.ScreenSaver.Lock"
> Failed to open connection to session message bus: Failed to execute
> dbus-launch to autolaunch D-Bus session
> 
> Am I missing something here? Shouldn't it be possible to activate the
> screensaver from outside of the user's X session?

it is possible... I just did it!!

I wanted to see if I could figure this out as a way to help learn
about environments. The key here is that you've got no
DBUS_SESSION_BUS_ADDRESS defined. And you've got to get the right
one. Here's how I hacked it.

from my X session, in a terminal, run

set | grep DBUS > tempenv

then from a vt as root I ran

source tempenv

which gets that environment variable set in the current login
session. then you have to export that variable before you can access
the dbus session.

export DBUS_SESSION_BUS_ADDRESS; su $user -c \
"gnome-screensaver-command --lock"

and lo and behold it works. It does spit out an error, but its the
same error that is spit out if you run the command within the x
session and it doesn't prevent it from locking. 

So you have to somehow get that variable out of your X session, maybe
by putting that set | grep command at the end of your .xinitrc or
whatever you use to launch X. and then you've got to somehow export
that variable so that the gnome-screensaver-command can access it. 

hth.

A

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