[Unit]
Description=GNOME Shell on Wayland
# On wayland, force a session shutdown
OnFailure=org.gnome.Shell-disable-extensions.service 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

[Service]
Slice=session.slice
Type=notify
# NOTE: This can be replaced with ConditionEnvironment=XDG_SESSION_TYPE=%I in
#       the [Unit] section with systemd >= 246. Also, the current solution is
#       kind of painful as systemd had a bug where it retries the condition.
# Only start if the template instance matches the session type.
ExecCondition=/bin/sh -c 'test "$XDG_SESSION_TYPE" = "%I" || exit 2'
ExecStart=/usr/bin/gnome-shell
# Exit code 1 means we are probably *not* dealing with an extension failure
SuccessExitStatus=1

# unset some environment variables that were set by the shell and won't work now that the shell 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 gnome-shell's OOM score to avoid being killed by OOM-killer too early
OOMScoreAdjust=-1000