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doc: cookbook: Add subsection about session locking with xss-lock. 

* doc/guix-cookbook.texi (Session lock): New node.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>
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Chris Bøg 2020-05-24 12:44:44 +02:00 committed by Ludovic Courtès
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@ -1617,6 +1617,47 @@ Then you need to add the following code to a StumpWM configuration file
(set-font (make-instance 'xft:font :family "DejaVu Sans Mono" :subfamily "Book" :size 11))
@end lisp
@node Session lock
@subsection Session lock
@cindex sessionlock
Depending on your environment, locking the screen of your session might come built in
or it might be something you have to set up yourself. If you use a desktop environment
like GNOME or KDE, it's usually built in. If you use a plain window manager like
StumpWM or EXWM, you might have to set it up yourself.
@node Xorg
@subsubsection Xorg
If you use Xorg, you can use the utility
@uref{https://www.mankier.com/1/xss-lock, xss-lock} to lock the screen of your session.
xss-lock is triggered by DPMS which since Xorg 1.8 is auto-detected and enabled if
ACPI is also enabled at kernel runtime.
To use xss-lock, you can simple execute it and put it into the background before
you start your window manager from e.g. your @file{~/.xsession}:
@example
xss-lock -- slock &
exec stumpwm
@end example
In this example, xss-lock uses @code{slock} to do the actual locking of the screen when
it determines it's appropriate, like when you suspend your device.
For slock to be allowed to be a screen locker for the graphical session, it needs to
be made setuid-root so it can authenticate users, and it needs a PAM service. This
can be achieved by adding the following service to your @file{config.scm}:
@lisp
(screen-locker-service slock)
@end lisp
If you manually lock your screen, e.g. by directly calling slock when you want to lock
your screen but not suspend it, it's a good idea to notify xss-lock about this so no
confusion occurs. This can be done by executing @code{xset s activate} immediately
before you execute slock.
@node Setting up a bind mount
@section Setting up a bind mount