bug#48220: [PATCH] gnu: xfce4-session: Add xset to propagated-inputs.

["Ludovic Courtès" <ludo@gnu.org>]

Hi!

Brendan Tildesley <mail@brendan.scot> skribis:

[...]

>> However, my understanding is that the xset code is already a fallback:
>
>> 
>> --8<---------------cut here---------------start------------->8---
>> # else run another access locking utility, if installed
>> for lock_cmd in \
>>   "xlock -mode blank" \
>>   "slock"
>>   do
>>     set -- $lock_cmd
>>     if command -v -- $1 >/dev/null 2>&1; then
>>         $lock_cmd >/dev/null 2>&1 &
>> 	# turn off display backlight:
>> 	xset dpms force off
>>         exit
>>     fi
>> done
>> --8<---------------cut here---------------end--------------->8---
>> 
>> Probably we should ensure the first ‘for’ loop works as expected.
>> Perhaps we need to replace ‘xfce4-screensaver-command’ by its absolute
>> file name there.
>> 
>
> Currently xfce4-screensaver is not installed in the xfce package at all by default,
> so it isn't used. I could add it, but for me it was glitchy/flickering and I would keep 
> clearing the password as I was entering it so I couldn't log back in. It even does it
> in a VM. I do have a recent amd graphics card with proprietary linux though, my computer
> can't boot otherwise :(.

Hmm OK.  We should address this in a separate issue.

> If you run guix environment --ad-hoc xfce4-screensaver
> then
>  xfce4-screensaver &; xfce4-screensaver-command --lock
> does it work for you?

I get:

--8<---------------cut here---------------start------------->8---
$ xfce4-screensaver & xfce4-screensaver-command --lock
[1] 19108
** Message: 12:20:44.361: Screensaver is not running! Start xfce4-screensaver first
--8<---------------cut here---------------end--------------->8---

… but I’m not running Xfce.  I should prolly try in a VM.

> I'm not sure what is best, should we be maximal and include xfce4-screensaver in the xfce
> package, or be minimal and make people have to install it manually?

I’d lean towards including xfce4-screensaver, since that’s the intended
use of Xfce, but only once it actually works.

> From ed66cf50a3b9294effc8bbae04b0f2564bd55c10 Mon Sep 17 00:00:00 2001
> From: Brendan Tildesley <mail@brendan.scot>
> Date: Thu, 6 May 2021 12:34:55 +1000
> Subject: [PATCH] gnu: xfce4-session: Allow xflock4 to use xset.
>
> * gnu/packages/xfce.scm (xfce4-session):
> [inputs]: Add xset.
> [arguments]: Add a phase to use exact store path to xset in xflock4.

[...]

> +         (add-after 'unpack 'patch-xflock
> +           (lambda _
> +             (substitute* "scripts/xflock4"
> +               (("xset") (which "xset"))))))))

Applied after changing ‘which’ to refer to the “xset” input so that it
works correctly when cross-compiling.

Closing, and let’s discuss xfce4-screensaver separately!

Thanks,
Ludo’.