Allow to launch only specific shell clients based on session type

Author: leolost2605

data/io.elementary.desktop.wm.shell

@@ -2,8 +2,10 @@
 launch-on-x=true
 args=io.elementary.wingpanel
 wait-for-n-panels=1
+session-type=desktop
 
 [io.elementary.dock]
 launch-on-x=true
 args=io.elementary.dock
 wait-for-n-panels=1
+session-type=desktop

lib/SessionSettings.vala

@@ -40,4 +40,17 @@ namespace Gala.SessionSettings {
     public bool is_greeter () {
         return get_session_type () != DESKTOP;
     }
+
+    public string get_shell_clients_type () {
+        switch (get_session_type ()) {
+            case DESKTOP:
+                return "desktop";
+            case GREETER:
+                return "greeter";
+            case INSTALLER:
+                return "installer";
+        }
+
+        return "desktop";
+    }
 }

src/ShellClients/ShellClientsManager.vala

@@ -103,6 +103,15 @@ public class Gala.ShellClientsManager : Object, GestureTarget {
                 }
             }
 
+            try {
+                var type = key_file.get_string (group, "session-type");
+                if (type != SessionSettings.get_shell_clients_type ()) {
+                    continue;
+                }
+            } catch (Error e) {
+                warning ("Failed to check session type for client %s, assuming it should be launched: %s", group, e.message);
+            }
+
             try {
                 starting_panels += key_file.get_integer (group, "wait-for-n-panels");
             } catch (Error e) {