Add systemd patch

patches/systemd/README.md

@@ -0,0 +1,33 @@
+### Description
+This is a simple patch that runs `systemctl --user import-environment WAYLAND_DISPLAY DISPLAY`, and `systemctl --user start dwl-session.target` after Dwl initializes, and then `systemctl --user stop dwl-session.target` when Dwl quits. This allows you to handle graceful startup and shutdown of your graphical systemd services, with the proper environment variables set. This is similar to [uwsm](https://github.com/Vladimir-csp/uwsm?tab=readme-ov-file), but it integrates natively with your existing systemd user services, and doesn't have uwsm's runtime overhead.
+
+You must have a `dwl-session.target` created that binds to `graphical-session.target`. You can then set the WantedBy of your systemd services to either `graphical-session.target`, or `dwl-session.target`, depending on whether you want them to start for just Dwl, or for every graphical session.
+
+Below is the Nix home-manager configuration I use to generate `dwl-session.target`, and its resulting output.
+```
+systemd.user.targets.dwl-session.Unit = {
+  Description = "dwl compositor session";
+  Documentation = [ "man:systemd.special(7)" ];
+  BindsTo = [ "graphical-session.target" ];
+  Wants = [ "graphical-session-pre.target" ];
+  After = [ "graphical-session-pre.target" ];
+};
+```
+
+```
+[Unit]
+After=graphical-session-pre.target
+BindsTo=graphical-session.target
+Description=dwl compositor session
+Documentation=man:systemd.special(7)
+Wants=graphical-session-pre.target
+```
+
+### Download
+- [git branch](https://github.com/Shringe/dwl/tree/systemd) 
+- [0.7](/dwl/dwl-patches/raw/branch/main/patches/systemd/systemd-0.7.patch)
+
+### Authors
+- [Shringe](https://codeberg.org/Shringe)
+- shringe_ at [dwl Discord](https://discord.gg/jJxZnrGPWN)
+

patches/systemd/systemd-0.7.patch

@@ -0,0 +1,64 @@
+From 43b3026b0744d54287eada71c84ea8be174950c3 Mon Sep 17 00:00:00 2001
+From: Shringe <dashingkoso@gmail.com>
+Date: Sat, 12 Jul 2025 01:00:46 -0500
+Subject: [PATCH] basic implementation
+
+---
+ dwl.c | 34 ++++++++++++++++++++++++++++++++++
+ 1 file changed, 34 insertions(+)
+
+diff --git a/dwl.c b/dwl.c
+index c717c1d..4ba134d 100644
+--- a/dwl.c
++++ b/dwl.c
+@@ -680,6 +680,15 @@ cleanup(void)
+ 	wlr_xwayland_destroy(xwayland);
+ 	xwayland = NULL;
+ #endif
++	/* Stop systemd target */
++	if (fork() == 0) {
++		setsid();
++		execvp("systemctl", (char *const[]) {
++			"systemctl", "--user", "stop", "dwl-session.target", NULL
++		});
++		exit(1);
++	}
++
+ 	wl_display_destroy_clients(dpy);
+ 	if (child_pid > 0) {
+ 		kill(-child_pid, SIGTERM);
+@@ -2222,6 +2231,31 @@ run(char *startup_cmd)
+ 		die("startup: display_add_socket_auto");
+ 	setenv("WAYLAND_DISPLAY", socket, 1);
+ 
++	/* Import environment variables then start systemd target */
++	if (fork() == 0) {
++		setsid();
++		
++		/* First: import environment variables */
++		pid_t import_pid = fork();
++		if (import_pid == 0) {
++			execvp("systemctl", (char *const[]) {
++				"systemctl", "--user", "import-environment", 
++				"DISPLAY", "WAYLAND_DISPLAY", NULL
++			});
++			exit(1);
++		}
++		
++		/* Wait for import to complete */
++		waitpid(import_pid, NULL, 0);
++		
++		/* Second: start target */
++		execvp("systemctl", (char *const[]) {
++			"systemctl", "--user", "start", "dwl-session.target", NULL
++		});
++		
++		exit(1);
++	}
++
+ 	/* Start the backend. This will enumerate outputs and inputs, become the DRM
+ 	 * master, etc */
+ 	if (!wlr_backend_start(backend))
+-- 
+2.49.0
+