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Content preview: * gnu/home/services/desktop.scm (wayland-shepherd-service):
New procedure. (home-wayland-service-type): New variable. * doc/guix.texi
(Desktop Home Services): Document it. Change-Id:
If1ed849d29198d2949c6852b0f2645e325211240
--- doc/guix.texi | 36 +++++++++++++++++++ gnu/home/services/desktop.scm
| 66 +++++++++++++++++++++++++++++++++++ 2 files changed, 102 insertions(+
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Content preview: * gnu/home/services/desktop.scm (wayland-shepherd-service):
New procedure. (home-wayland-service-type): New variable. * doc/guix.texi
(Desktop Home Services): Document it. Change-Id: If1ed849d29198d2949c6852b0f2645e325211240
--- doc/guix.texi | 36 +++++++++++++++++++ gnu/home/services/desktop.scm
| 66 +++++++++++++++++++++++++++++++++++ 2 files changed, 102 insertions(+
[...]
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* gnu/home/services/desktop.scm (wayland-shepherd-service): New procedure.
(home-wayland-service-type): New variable.
* doc/guix.texi (Desktop Home Services): Document it.
Change-Id: If1ed849d29198d2949c6852b0f2645e325211240
---
doc/guix.texi | 36 +++++++++++++++++++
gnu/home/services/desktop.scm | 66 +++++++++++++++++++++++++++++++++++
2 files changed, 102 insertions(+)
diff --git a/doc/guix.texi b/doc/guix.texi
index bb5f29277f..36b86cffe1 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -47839,6 +47839,42 @@ In the example above, @code{x11-display} is instructed to set
@env{DISPLAY} to @code{:3}.
@end defvar
+@defvar home-wayland-service-type
+This is the service type representing a Wayland compositor. It
+functions as an equivalent of @code{x11-service-type} for Wayland.
+
+Like X11, Wayland compositors are started by services like
+@code{gdm-service-type}, described in the system configuration. At the
+level of Guix Home, as an unprivileged user, we cannot start our Wayland
+compositor; all we can do is check whether it is running. This is what
+this service does.
+
+As a user, you probably don't need to worry or explicitly instantiate
+@code{home-wayland-service-type}. Services that require an Wayland
+graphical display instantiate this service and depend on its
+corresponding @code{wayland-display} Shepherd service (@pxref{Shepherd
+Home Service}).
+
+If you're writing a Shepherd service that requires the presence of a
+Wayland compositor, you need to depend on this service to ensure Wayland
+is accessible from your service.
+
+When the Wayland compositor is running, the @code{wayland-display}
+Shepherd service starts and sets the @env{WAYLAND_DISPLAY} environment
+variable of the @command{shepherd} process, using its original value if
+it was already set; otherwise, it fails to start.
+
+The service can also be forced to use a given value for
+@env{WAYLAND_DISPLAY}, like so:
+
+@example
+herd start wayland-display wayland-2
+@end example
+
+In the example above, @code{wayland-display} is instructed to set
+@env{WAYLAND_DISPLAY} to @code{wayland-2}.
+@end defvar
+
@defvar home-redshift-service-type
This is the service type for @uref{https://github.com/jonls/redshift,
Redshift}, a program that adjusts the display color temperature
diff --git a/gnu/home/services/desktop.scm b/gnu/home/services/desktop.scm
index fc96ce9295..88bc871adb 100644
--- a/gnu/home/services/desktop.scm
+++ b/gnu/home/services/desktop.scm
@@ -33,6 +33,8 @@ (define-module (gnu home services desktop)
#:use-module (ice-9 match)
#:export (home-x11-service-type
+ home-wayland-service-type
+
home-redshift-configuration
home-redshift-configuration?
home-redshift-service-type
@@ -121,6 +123,70 @@ (define home-x11-service-type
during that time, the @code{x11-display} service is marked as failing to
start.")))
+
+;;;
+;;; Waiting for Wayland.
+;;;
+
+(define (wayland-shepherd-service config)
+ (list (shepherd-service
+ (provision '(wayland-display))
+ (modules '((ice-9 ftw)
+ (ice-9 regex)
+ (ice-9 match)
+ (srfi srfi-1)
+ (shepherd support)))
+ (respawn? #t)
+ (respawn-limit config)
+ (respawn-delay 1)
+ (start
+ #~(lambda* (#:optional (env-wayland-display (getenv "WAYLAND_DISPLAY")))
+
+ (define wayland-socket-regex "wayland-[0-9]+$")
+
+ (define (find-socket directory regex)
+ (find (match-lambda
+ ((or "." "..") #f)
+ (name
+ (let ((name (in-vicinity directory
+ name)))
+ (and (string-match regex name)
+ (access? name O_RDWR)))))
+ ;; Wayland names its sockets ‘wayland-n’. With
+ ;; ‘reverse’, we pick up on the last Wayland instance
+ ;; created (essentially what we always want to do).
+ (or (reverse (scandir directory)) '())))
+
+ (define wayland-display
+ (or env-wayland-display
+ (find-socket %user-runtime-dir "wayland-[0-9]+$")))
+
+ (when wayland-display
+ (format #t "Wayland display found at ~s.~%" wayland-display)
+ ;; Note: 'make-forkexec-constructor' calls take their
+ ;; default #:environment-variables value before this service
+ ;; is started and are thus unaffected by the 'setenv' call
+ ;; below. Users of this service have to explicitly query
+ ;; its value.
+ (setenv "WAYLAND_DISPLAY" wayland-display))
+ wayland-display))
+ (stop #~(lambda (_)
+ (unsetenv "WAYLAND_DISPLAY")
+ #f)))))
+
+(define home-wayland-service-type
+ (service-type
+ (name 'home-wayland-display)
+ (extensions (list (service-extension home-shepherd-service-type
+ wayland-shepherd-service)))
+ (default-value 10)
+ (description
+ "Create a @code{wayland-display} Shepherd service that waits for a Wayland
+compositor to be up and running, up to a configurable delay, and sets the
+@code{WAYLAND_DISPLAY} environment variable of @command{shepherd} itself
+accordingly. If no accessible Wayland server shows up during that time, the
+@code{wayland-display} service is marked as failing to start.")))
+
;;;
;;; Redshift.
--
2.48.1
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Sisiutl <sisiutl@HIDDEN> Subject: bug#76619: Acknowledgement ([PATCH] gnu: home: services: Add 'wayland-display' service.) Message-ID: <handler.76619.B.174069643021168.ack <at> debbugs.gnu.org> References: <20250227224636.30227-1-sisiutl@HIDDEN> X-Gnu-PR-Message: ack 76619 X-Gnu-PR-Package: guix-patches X-Gnu-PR-Keywords: patch Reply-To: 76619 <at> debbugs.gnu.org Date: Thu, 27 Feb 2025 22:48:05 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): guix-patches@HIDDEN If you wish to submit further information on this problem, please send it to 76619 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 76619: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76619 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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Hello,
Sisiutl <sisiutl@HIDDEN> skribis:
> * gnu/home/services/desktop.scm (wayland-shepherd-service): New procedure.
> (home-wayland-service-type): New variable.
> * doc/guix.texi (Desktop Home Services): Document it.
>
> Change-Id: If1ed849d29198d2949c6852b0f2645e325211240
Nice! So this is a followup to <https://issues.guix.gnu.org/76060>.
[...]
> +(define (wayland-shepherd-service config)
> + (list (shepherd-service
> + (provision '(wayland-display))
> + (modules '((ice-9 ftw)
> + (ice-9 regex)
> + (ice-9 match)
> + (srfi srfi-1)
> + (shepherd support)))
> + (respawn? #t)
> + (respawn-limit config)
> + (respawn-delay 1)
The default value for =E2=80=98config=E2=80=99 is 10, but that=E2=80=99s no=
t a valid value for
=E2=80=98respawn-limit=E2=80=99 (it should be a pair).
But anyway, we should remove these two fields: they have no effect,
except for services associated with a process. We can also change
=E2=80=98default-value=E2=80=99 to #f or so to not give the impression that=
it has a
special meaning.
Apart from that LGTM; let me know if you can make this change (and if it
sounds right to you) or I can do it on your behalf.
Thanks,
Ludo=E2=80=99.
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Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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X-Loop: help-debbugs@HIDDEN
Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Hi Hilton,
Hilton Chain <hako@HIDDEN> skribis:
> Since some services may depend on either DISPLAY or WAYLAND_DISPLAY, and =
these
> two services (x11-display, wayland-display) are similar, I think we can m=
erge
> them into one and deprecate home-x11-service-type by this new service.
>
> e.g.
>
> service: home-display-service-type
> configuration: x11? (boolean: #f) wayland? (boolean: #f) time-to-wait (in=
teger: 10)
> default-value #f
> provision: 'x11-display when x11? is #t
> 'wayland-display when walyand? is #t
> 'display when either x11? or wayland? is #t
> return value: "DISPLAY: unset; WAYLAND_DISPLAY: wayland-1"
>
> Then one service can choose to depend on 'display or specifically 'x11-di=
splay /
> 'wayland-display.
That sounds like a good idea to me. It goes beyond the scope of the
initial patch in this thread though.
Sisiutl, Hilton: who wants to work on it?
Thanks,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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On Wed, 05 Mar 2025 23:16:18 +0800,
Ludovic Court=E8s wrote:
>
> Hi Hilton,
>
> Hilton Chain <hako@HIDDEN> skribis:
>
> > Since some services may depend on either DISPLAY or WAYLAND_DISPLAY, an=
d these
> > two services (x11-display, wayland-display) are similar, I think we can=
merge
> > them into one and deprecate home-x11-service-type by this new service.
> >
> > e.g.
> >
> > service: home-display-service-type
> > configuration: x11? (boolean: #f) wayland? (boolean: #f) time-to-wait (=
integer: 10)
> > default-value #f
> > provision: 'x11-display when x11? is #t
> > 'wayland-display when walyand? is #t
> > 'display when either x11? or wayland? is #t
> > return value: "DISPLAY: unset; WAYLAND_DISPLAY: wayland-1"
> >
> > Then one service can choose to depend on 'display or specifically 'x11-=
display /
> > 'wayland-display.
>
> That sounds like a good idea to me. It goes beyond the scope of the
> initial patch in this thread though.
>
> Sisiutl, Hilton: who wants to work on it?
Sure, I can do this. I'll begin in a few days.
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Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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Hi!
Hilton Chain <hako@HIDDEN> skribis:
> On a second thought =E2=80=98display=E2=80=99 may not be a good name, I'm=
going to use
> =E2=80=98graphical-session=E2=80=99, sounds familiar? ;)
Good idea. :-)
> I have realized that for a Wayland session, setting only =E2=80=98WAYLAND=
_DISPLAY=E2=80=99 in
> Shepherd is not sufficient to make all applications work.
The goal of =E2=80=98x11-display=E2=80=99 now is only to (1) ensure X11 is =
running, and
(2) determine the correct value of =E2=80=98DISPLAY=E2=80=99 so other servi=
ces can use
it.
I would say that other environment variables like the Freedesktop ones
(XDG_*) are beyond the scope of such a service. WDYT?
> herd start graphical-session \
> DISPLAY=3D$DISPLAY \
> WAYLAND_DISPLAY=3D$WAYLAND_DISPLAY \
> XDG_SESSION_TYPE=3D$XDG_SESSION_TYPE \
> XDG_CURRENT_DESKTOP=3D$XDG_CURRENT_DESKTOP \
> NIRI_SOCKET=3D$NIRI_SOCKET
>
>
> These environment variables will be collected in =E2=80=98GUIX_GRAPHICAL_=
SESSION=E2=80=99:
That seems a bit too complex to me.
> However I found that Shepherd starts =E2=80=98graphical-session=E2=80=99 =
even if its
> auto-starting is disabled, when there're services depending on it.
That=E2=80=99s not really intended, but it=E2=80=99s a Guix issue, not a Sh=
epherd issue
(the Shepherd has no notion of =E2=80=9Cauto starting=E2=80=9D; it just sta=
rts whatever
you ask it to start in your config file).
Perhaps the =E2=80=98auto-start?=E2=80=99 property should automatically pro=
pagate along
edges?
Thanks,
Ludo=E2=80=99.
X-Loop: help-debbugs@HIDDEN
Subject: [bug#76619] [PATCH] gnu: home: services: Add 'wayland-display' service.
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