Add and call niri-shutdown.target

Sometimes graphical-session.target lingers on after niri quits, leading
to services not being started on a quick relogin. To work around this,
add and run a systemd target that conflicts with
graphical-session.target and forces its shutdown.

Cargo.toml

@@ -84,6 +84,7 @@ assets = [
     { source = "resources/niri.desktop", dest = "/usr/share/wayland-sessions/", mode = "644" },
     { source = "resources/niri-portals.conf", dest = "/usr/share/xdg-desktop-portal/", mode = "644" },
     { source = "resources/niri.service", dest = "/usr/lib/systemd/user/", mode = "644" },
+    { source = "resources/niri-shutdown.target", dest = "/usr/lib/systemd/user/", mode = "644" },
 ]
 [package.metadata.generate-rpm.requires]
 alacritty = "*"

README.md

@@ -64,6 +64,7 @@ To do that, put files into the correct directories according to this table.
 | `resources/niri.desktop` | `/usr/share/wayland-sessions/` |
 | `resources/niri-portals.conf` | `/usr/share/xdg-desktop-portal/` |
 | `resources/niri.service` | `/usr/lib/systemd/user/` |
+| `resources/niri-shutdown.target` | `/usr/lib/systemd/user/` |
 
 Doing this will make niri appear in GDM and, presumably, other display managers.
 

resources/niri-session

@@ -40,5 +40,8 @@ fi
 # Start niri and wait for it to terminate.
 systemctl --user --wait start niri.service
 
+# Force stop of grahical-session.target.
+systemctl --user start --job-mode=replace-irreversibly niri-shutdown.target
+
 # Unset environment that we've set.
 systemctl --user unset-environment WAYLAND_DISPLAY XDG_SESSION_TYPE XDG_CURRENT_DESKTOP

resources/niri-shutdown.target

@@ -0,0 +1,7 @@
+[Unit]
+Description=Shutdown running niri session
+DefaultDependencies=no
+StopWhenUnneeded=true
+
+Conflicts=graphical-session.target graphical-session-pre.target
+After=graphical-session.target graphical-session-pre.target