fix for phosh under gnome-session 46

Upstream PR: https://gitlab.gnome.org/World/Phosh/phosh/-/merge_requests/1391

Without this patch, phosh can no longer start as gnome-session 46 has dropped the --systemd flag and will fail if it is passed.

It's already being applied to Mobian so I think the patch is already in good shape: https://salsa.debian.org/DebianOnMobile-team/phosh/-/merge_requests/74/diffs

I also added python-packaging to makedepends because I couldn't get a clean build in chroot without it.

I've tested this patch locally and confirmed it fixes phosh under gnome-session 46.

0001-treewide-Drop-support-for-builtin-session-fallback.patch

+From 047835b6174e012960c7a4dc98e3e02ad44f45a8 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Guido=20G=C3=BCnther?= <agx@sigxcpu.org>
+Date: Sat, 30 Mar 2024 20:42:27 +0100
+Subject: [PATCH 0001/0001] treewide: Drop support for --builtin session
+ fallback
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Always use systemd as gnome 46's gnome-session doesn't support anything
+else.
+
+Thanks dhjg2000 for figuring this out
+
+Signed-off-by: Guido Günther <agx@sigxcpu.org>
+---
+ data/meson.build                 | 11 -----------
+ data/phosh-session.in            |  2 +-
+ data/sm.puri.Phosh.desktop.in.in |  2 +-
+ data/systemd/meson.build         |  3 ---
+ debian/rules                     |  2 +-
+ meson.build                      |  1 -
+ meson_options.txt                |  4 ----
+ 7 files changed, 3 insertions(+), 22 deletions(-)
+
+diff --git a/data/meson.build b/data/meson.build
+index d76391f4..5bcf7d31 100644
+--- a/data/meson.build
++++ b/data/meson.build
+@@ -26,11 +26,6 @@ desktopconf = configuration_data()
+ desktopconf.set('bindir', bindir)
+ desktopconf.set('libexecdir', libexecdir)
+ desktopconf.set('required_components', ';'.join(desktop_required_components) + ';')
+-if get_option('systemd')
+-  desktopconf.set('hidden_under_systemd', 'X-GNOME-HiddenUnderSystemd=true')
+-else
+-  desktopconf.set('hidden_under_systemd', '')
+-endif
+ 
+ desktop_utils = find_program('desktop-file-validate', required: false)
+ desktop_files = {
+@@ -85,12 +80,6 @@ runconf.set('version', meson.project_version())
+ runconf.set('wlrootsdir', join_paths(libexecdir, 'wlroots'))
+ runconf.set('compositor', get_option('compositor'))
+ 
+-if get_option('systemd')
+-  runconf.set('session_manager', '--systemd')
+-else
+-  runconf.set('session_manager', '--builtin')
+-endif
+-
+ configure_file(
+   input: 'phosh-session.in',
+   output: 'phosh-session',
+diff --git a/data/phosh-session.in b/data/phosh-session.in
+index 6c295ab8..9b951b6c 100755
+--- a/data/phosh-session.in
++++ b/data/phosh-session.in
+@@ -54,4 +54,4 @@ fi
+ # variables from /etc/profile.d (XDG_*)
+ [ -n "$WLR_BACKENDS" ] || WLR_BACKENDS=drm,libinput
+ export WLR_BACKENDS
+-exec "${COMPOSITOR}" -S -C "${PHOC_INI}" -E "bash -lc 'exec ${GNOME_SESSION} --disable-acceleration-check --session=phosh @session_manager@'"
++exec "${COMPOSITOR}" -S -C "${PHOC_INI}" -E "bash -lc 'exec ${GNOME_SESSION} --disable-acceleration-check --session=phosh'"
+diff --git a/data/sm.puri.Phosh.desktop.in.in b/data/sm.puri.Phosh.desktop.in.in
+index d777bccc..51d8a784 100644
+--- a/data/sm.puri.Phosh.desktop.in.in
++++ b/data/sm.puri.Phosh.desktop.in.in
+@@ -11,5 +11,5 @@ X-GNOME-Autostart-Phase=DisplayServer
+ X-GNOME-Provides=panel;windowmanager;
+ X-GNOME-Autostart-Notify=true
+ X-GNOME-AutoRestart=true
++X-GNOME-HiddenUnderSystemd=true
+ X-Phosh-UsesFeedback=true
+-@hidden_under_systemd@
+diff --git a/data/systemd/meson.build b/data/systemd/meson.build
+index 5a11df87..bc3c4738 100644
+--- a/data/systemd/meson.build
++++ b/data/systemd/meson.build
+@@ -1,5 +1,3 @@
+-if get_option('systemd')
+-
+ gsd_wants = ''
+ foreach component : gsd_required_components
+   gsd_wants += 'Wants=' + component + '.target\n'
+@@ -34,4 +32,3 @@ configure_file(
+ 
+ install_data('sm.puri.Phosh.target', install_dir: systemduserdir)
+ 
+-endif
+diff --git a/debian/rules b/debian/rules
+index 6439a08c..4917d65b 100755
+--- a/debian/rules
++++ b/debian/rules
+@@ -2,7 +2,7 @@
+ 
+ export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+ 
+-CONFIGURE_OPTS=-Dphoc_tests=disabled -Dsystemd=true
++CONFIGURE_OPTS=-Dphoc_tests=disabled
+ 
+ ifeq ($(filter nodoc,$(DEB_BUILD_PROFILES)),)
+   CONFIGURE_OPTS+=-Dgtk_doc=true -Dman=true
+diff --git a/meson.build b/meson.build
+index d300d39b..6ece185c 100644
+--- a/meson.build
++++ b/meson.build
+@@ -261,7 +261,6 @@ summary({
+ 
+ summary({
+     'Compositor:': get_option('compositor'),
+-    'Systemd for session': get_option('systemd'),
+   },
+   bool_yn: true,
+   section: 'Runtime',
+diff --git a/meson_options.txt b/meson_options.txt
+index 2320bd75..685357c3 100644
+--- a/meson_options.txt
++++ b/meson_options.txt
+@@ -14,10 +14,6 @@ option('man',
+        type: 'boolean', value : false,
+        description : 'generate man pages (requires rst2man)')
+ 
+-option('systemd',
+-       type: 'boolean', value: false,
+-       description: 'Whether to generate systemd user units')
+-
+ option('compositor',
+        type: 'string', value: '/usr/bin/phoc',
+        description: 'Path to the Phoc compositor for use in the launcher script')
+-- 
+2.44.0
+