PKGBUILDs/extra/cups/cups-systemd-socket.patch

diff -up cups-2.0.2/scheduler/main.c.ustTJg cups-2.0.2/scheduler/main.c
--- cups-2.0.2/scheduler/main.c.ustTJg	2015-02-10 13:40:24.121547526 +0100
+++ cups-2.0.2/scheduler/main.c	2015-02-10 13:40:24.295545063 +0100
@@ -690,8 +690,15 @@ main(int  argc,				/* I - Number of comm
 
 #if defined(HAVE_ONDEMAND)
   if (OnDemand)
+  {
     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started on demand.");
-  else
+# ifdef HAVE_SYSTEMD
+    sd_notifyf(0, "READY=1\n"
+               "STATUS=Scheduler is running...\n"
+               "MAINPID=%lu",
+               (unsigned long) getpid());
+# endif /* HAVE_SYSTEMD */
+  } else
 #endif /* HAVE_ONDEMAND */
   if (fg)
     cupsdAddEvent(CUPSD_EVENT_SERVER_STARTED, NULL, NULL, "Scheduler started in foreground.");
diff -up cups-2.0.2/scheduler/org.cups.cupsd.path.in.ustTJg cups-2.0.2/scheduler/org.cups.cupsd.path.in
--- cups-2.3.0/scheduler/cups.service.in	2019-08-23 17:19:38.000000000 +0200
+++ cups-2.3.0/scheduler/cups.service.in.new	2019-08-25 20:20:25.805339727 +0200
@@ -1,12 +1,13 @@
 [Unit]
 Description=CUPS Scheduler
 Documentation=man:cupsd(8)
-After=sssd.service
+After=sssd.service network-online.target
 Requires=cups.socket
+Wants=network-online.target

 [Service]
 ExecStart=@sbindir@/cupsd -l
-Type=simple
+Type=notify
 Restart=on-failure

 [Install]