Add support for running as a dinit service (#728)

* Added dinit services

* Added dinit support to niri-session

* Replaced shutdown script for dinit with a single command execution

* Added dinit service files to Getting Started install tables

* Fix typo in resources/dinit/niri

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* Fixed mistakes in wiki/Getting-Started.md

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

* niri-session does not start dinit anymore

---------

Co-authored-by: Ivan Molodetskikh <yalterz@gmail.com>

resources/dinit/niri

@@ -0,0 +1,8 @@
+type              = process
+command           = niri --session
+restart           = false
+working-dir       = $HOME
+depends-on        = dbus
+after             = niri-shutdown
+chain-to          = niri-shutdown
+options:          always-chain

resources/dinit/niri-shutdown

@@ -0,0 +1,3 @@
+type               = scripted
+command            = dinitctl -u setenv WAYLAND_DISPLAY= XDG_SESSION_TYPE= XDG_CURRENT_DESKTOP= NIRI_SOCKET=
+restart            = false

resources/niri-session

@@ -11,6 +11,8 @@ if [ -n "$SHELL" ] &&
   fi
 fi
 
+# Try to detect the service manager that is being used
+if hash systemctl &> /dev/null; then
     # Make sure there's no already running session.
     if systemctl --user -q is-active niri.service; then
       echo 'A niri session is already running.'
@@ -39,3 +41,21 @@ 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 NIRI_SOCKET
+elif hash dinitctl &> /dev/null; then
+    # Check that the user dinit daemon is running
+    if ! pgrep -u $(id -u) dinit &> /dev/null; then
+      echo "dinit user daemon is not running."
+      exit 1
+    fi
+
+    # Make sure there's no already running session.
+    if dinitctl --user is-started niri &> /dev/null; then
+      echo 'A niri session is already running.'
+      exit 1
+    fi
+
+    # Start niri
+    dinitctl --user start niri
+else
+    echo "No systemd or dinit detected, please use niri --session instead."
+fi

wiki/Getting-Started.md

@@ -8,8 +8,8 @@ After installing, start niri from your display manager like GDM.
 Press <kbd>Super</kbd><kbd>T</kbd> to run a terminal ([Alacritty]) and <kbd>Super</kbd><kbd>D</kbd> to run an application launcher ([fuzzel]).
 To exit niri, press <kbd>Super</kbd><kbd>Shift</kbd><kbd>E</kbd>.
 
-If you're not using a display manager, you should run `niri-session` (systemd) or `niri --session` (not systemd) from a TTY.
+If you're not using a display manager, you should run `niri-session` (systemd/dinit) or `niri --session` (others) from a TTY.
-The `--session` flag will make niri import its environment variables globally into systemd and D-Bus, and start its D-Bus services.
+The `--session` flag will make niri import its environment variables globally into the system manager and D-Bus, and start its D-Bus services.
 
 You can also run `niri` inside an existing desktop session.
 Then it will open as a window, where you can give it a try.
@@ -178,8 +178,10 @@ To do that, put files into the correct directories according to this table.
 | `resources/niri-session` | `/usr/bin/` |
 | `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.service` (systemd) | `/usr/lib/systemd/user/` |
-| `resources/niri-shutdown.target` | `/usr/lib/systemd/user/` |
+| `resources/niri-shutdown.target` (systemd) | `/usr/lib/systemd/user/` |
+| `resources/dinit/niri` (dinit) | `/usr/lib/dinit.d/user/` |
+| `resources/dinit/niri-shutdown` (dinit) | `/usr/lib/dinit.d/user/` |
 
 Doing this will make niri appear in GDM and other display managers.
 
@@ -195,8 +197,10 @@ These may vary depending on your distribution.
 | `resources/niri-session` | `/usr/local/bin/` |
 | `resources/niri.desktop`  | `/usr/local/share/wayland-sessions/` |
 | `resources/niri-portals.conf` | `/usr/local/share/xdg-desktop-portal/` |
-| `resources/niri.service` | `/etc/systemd/user/` |
+| `resources/niri.service` (systemd) | `/etc/systemd/user/` |
-| `resources/niri-shutdown.target` | `/etc/systemd/user/` |
+| `resources/niri-shutdown.target` (systemd) | `/etc/systemd/user/` |
+| `resources/dinit/niri` (dinit) | `/etc/dinit.d/user/` |
+| `resources/dinit/niri-shutdown` (dinit) | `/etc/dinit.d/user/` |
 
 [Alacritty]: https://github.com/alacritty/alacritty
 [fuzzel]: https://codeberg.org/dnkl/fuzzel