add pid file and openrc detection

src/server-main.vala

@@ -75,7 +75,26 @@ namespace TUFManager {
                 if (pid < 0) {
                     Posix.exit (Posix.EXIT_FAILURE);
                 }
-                else if (pid > 0) {
+                
+                if (pid > 0) {
+                    try {
+                        File file = File.new_for_path ("/run/tufmanager");
+                        if (!file.query_exists ()) {
+                            file.make_directory_with_parents ();
+                        }
+                        file = null;
+                    }
+                    catch (Error e) {
+                        stderr.printf (_ ("Error: %s\n"), e.message);
+                    }
+                    var stream = FileStream.open ("/run/tufmanager/pid", "w");
+                    if (stream == null) {
+                        stderr.printf (_ ("Could not create pid file!\n"));
+                    }
+                    else {
+                        uint32 pidfile = pid;
+                        stream.puts (pidfile.to_string ()); 
+                    }
                     Posix.exit (Posix.EXIT_SUCCESS);
                 }
 
@@ -100,7 +119,7 @@ namespace TUFManager {
                 on_bus_acquired,
                 () => {},
                 () => {
-                    stderr.printf (_ ("Could not acquire bus name\n"));
+                    stderr.printf (_ ("Could not acquire bus name!\n"));
                 });
 
             loop = new MainLoop ();