Update Gala Systemd services (#1692)

data/gala.target

@@ -1,10 +1,10 @@
 [Unit]
-Description=Gala on X11
+Description=Gala
 DefaultDependencies=no
 
 Requisite=gnome-session-initialized.target
 PartOf=gnome-session-initialized.target
 Before=gnome-session-initialized.target
 
-Requires=gala-x11.service
+Wants=io.elementary.gala@wayland.service
-After=gala-x11.service
+Wants=io.elementary.gala@x11.service

data/gala@wayland.service.in

@@ -0,0 +1,34 @@
+[Unit]
+Description=Gala on Wayland
+# On wayland, force a session shutdown
+OnFailure=gnome-session-shutdown.target
+OnFailureJobMode=replace-irreversibly
+CollectMode=inactive-or-failed
+RefuseManualStart=on
+RefuseManualStop=on
+
+After=gnome-session-manager.target
+
+Requisite=gnome-session-initialized.target
+PartOf=gnome-session-initialized.target
+Before=gnome-session-initialized.target
+
+#NOTE: ConditionEnvironment works with systemd >= 246
+ConditionEnvironment=XDG_SESSION_TYPE=%I
+
+[Service]
+Slice=session.slice
+Type=notify
+ExecStart=@bindir@/gala
+
+# unset some environment variables that were set by the compositor and won't work now that the compositor is gone
+ExecStopPost=-/bin/sh -c 'test "$SERVICE_RESULT" != "exec-condition" && systemctl --user unset-environment GNOME_SETUP_DISPLAY WAYLAND_DISPLAY DISPLAY XAUTHORITY'
+
+# On wayland we cannot restart
+Restart=no
+# Kill any stubborn child processes after this long
+TimeoutStopSec=5
+
+# Lower down Gala's OOM score to avoid being killed by OOM-killer too early
+OOMScoreAdjust=-1000
+

data/gala@x11.service.in

@@ -1,6 +1,6 @@
 [Unit]
 Description=Gala on X11
-# On X11, try to show the fail whale screen
+# On X11, try to show the GNOME Session Failed screen
 OnFailure=gnome-session-failed.target
 OnFailureJobMode=replace
 CollectMode=inactive-or-failed
@@ -13,16 +13,28 @@ Requisite=gnome-session-initialized.target
 PartOf=gnome-session-initialized.target
 Before=gnome-session-initialized.target
 
+#NOTE: ConditionEnvironment works with systemd >= 246
+ConditionEnvironment=XDG_SESSION_TYPE=%I
+
 # Limit startup frequency more than the default
 StartLimitIntervalSec=15s
 StartLimitBurst=3
 
 [Service]
+Slice=session.slice
 Type=notify
 ExecStart=@bindir@/gala
+
+# On X11 we do not need to unset any variables
+
+# On X11 we want to restart on-success (Alt+F2 + r) and on-failure.
 Restart=always
-# Do not wait before restarting
+# Do not wait before restarting the shell
 RestartSec=0ms
 # Kill any stubborn child processes after this long
 TimeoutStopSec=5
 
+# Lower down gnome-shell's OOM score to avoid being killed by OOM-killer too early
+OOMScoreAdjust=-1000
+
+

data/meson.build

@@ -50,15 +50,24 @@ if get_option('systemd')
     unit_conf.set('bindir', bindir)
 
     configure_file(
-        input: 'gala-x11.service.in',
+        input: 'gala@x11.service.in',
-        output: 'gala-x11.service',
+        output: 'io.elementary.gala@x11.service',
+        install: true,
+        install_dir: systemd_userunitdir,
+        configuration: unit_conf
+    )
+
+    configure_file(
+        input: 'gala@wayland.service.in',
+        output: 'io.elementary.gala@wayland.service',
         install: true,
         install_dir: systemd_userunitdir,
         configuration: unit_conf
     )
 
     install_data(
-        'gala-x11.target',
+        'gala.target',
+        rename: 'io.elementary.gala.target',
         install_dir: systemd_userunitdir
     )
 endif