From dc9f7c0adc0b65aec010586e8b9848db5f0964de Mon Sep 17 00:00:00 2001
From: Rui Matos <tiagomatos@gmail.com>
Date: Wed, 11 Oct 2017 18:10:54 +0200
Subject: [PATCH 3/3] Revert "sharing: Use systemd to track running services"

This reverts commit e0b7f4143bdd201c824499dd09159f5890a07c6a.
---
 plugins/sharing/gsd-sharing-manager.c | 114 ++++++++++++++++------------------
 1 file changed, 55 insertions(+), 59 deletions(-)

diff --git a/plugins/sharing/gsd-sharing-manager.c b/plugins/sharing/gsd-sharing-manager.c
index 26663442..b24c4814 100644
--- a/plugins/sharing/gsd-sharing-manager.c
+++ b/plugins/sharing/gsd-sharing-manager.c
@@ -38,6 +38,8 @@
 typedef struct {
         const char  *name;
         GSettings   *settings;
+        gboolean     started;
+        GSubprocess *process;
 } ServiceInfo;
 
 struct GsdSharingManagerPrivate
@@ -104,72 +106,48 @@ static const char * const services[] = {
 };
 
 static void
-handle_unit_cb (GObject      *source_object,
-                GAsyncResult *res,
-                gpointer      user_data)
+gsd_sharing_manager_start_service (GsdSharingManager *manager,
+                                   ServiceInfo       *service)
 {
+        GDesktopAppInfo *app;
+        const char *exec;
+        char *desktop, **argvp;
         GError *error = NULL;
-        GVariant *ret;
-        const char *operation = user_data;
 
-        ret = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source_object),
-                                             res, &error);
-        if (!ret) {
-                if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
-                        g_warning ("Failed to %s service: %s", operation, error->message);
-                g_error_free (error);
+        if (service->started)
                 return;
-        }
+        g_debug ("About to start %s", service->name);
 
-        g_variant_unref (ret);
+        desktop = g_strdup_printf ("%s.desktop", service->name);
+        app = g_desktop_app_info_new (desktop);
+        g_free (desktop);
 
-}
+        if (!app) {
+                g_warning ("Could not find desktop file for service '%s'", service->name);
+                return;
+        }
 
-static void
-gsd_sharing_manager_handle_service (GsdSharingManager   *manager,
-                                    const char          *method,
-                                    GAsyncReadyCallback  callback,
-                                    ServiceInfo         *service)
-{
-        char *service_file;
-
-        service_file = g_strdup_printf ("%s.service", service->name);
-        g_dbus_connection_call (manager->priv->connection,
-                                "org.freedesktop.systemd1",
-                                "/org/freedesktop/systemd1",
-                                "org.freedesktop.systemd1.Manager",
-                                method,
-                                g_variant_new ("(ss)", service_file, "replace"),
-                                NULL,
-                                G_DBUS_CALL_FLAGS_NONE,
-                                -1,
-                                manager->priv->cancellable,
-                                callback,
-                                manager);
-        g_free (service_file);
-}
+        exec = g_app_info_get_commandline (G_APP_INFO (app));
 
-static void
-gsd_sharing_manager_start_service (GsdSharingManager *manager,
-                                   ServiceInfo       *service)
-{
-        g_debug ("About to start %s", service->name);
+        if (!g_shell_parse_argv (exec, NULL, &argvp, &error)) {
+                g_warning ("Could not parse command-line '%s': %s", exec, error->message);
+                g_error_free (error);
+                g_object_unref (app);
+                return;
+        }
 
-        /* We use StartUnit, not StartUnitReplace, since the latter would
-         * cancel any pending start we already have going from an
-         * earlier _start_service() call */
-        gsd_sharing_manager_handle_service (manager, "StartUnit",
-                                            handle_unit_cb, "start");
-}
+        service->process = g_subprocess_newv ((const gchar * const*) argvp, G_SUBPROCESS_FLAGS_NONE, &error);
 
-static void
-gsd_sharing_manager_stop_service (GsdSharingManager *manager,
-                                  ServiceInfo       *service)
-{
-        g_debug ("About to stop %s", service->name);
+        if (!service->process) {
+                g_warning ("Could not start command-line '%s': %s", exec, error->message);
+                g_error_free (error);
+                service->started = FALSE;
+        } else {
+                service->started = TRUE;
+        }
 
-        gsd_sharing_manager_handle_service (manager, "StopUnit",
-                                            handle_unit_cb, "stop");
+        g_strfreev (argvp);
+        g_object_unref (app);
 }
 
 #ifdef HAVE_NETWORK_MANAGER
@@ -202,6 +180,22 @@ service_is_enabled_on_current_connection (GsdSharingManager *manager,
 #endif /* HAVE_NETWORK_MANAGER */
 
 static void
+gsd_sharing_manager_stop_service (GsdSharingManager *manager,
+                                  ServiceInfo       *service)
+{
+        if (!service->started ||
+            service->process == NULL) {
+                    return;
+        }
+
+        g_debug ("About to stop %s", service->name);
+
+        g_subprocess_send_signal (service->process, SIGTERM);
+        g_clear_object (&service->process);
+        service->started = FALSE;
+}
+
+static void
 gsd_sharing_manager_sync_services (GsdSharingManager *manager)
 {
         GList *services, *l;
@@ -216,10 +210,12 @@ gsd_sharing_manager_sync_services (GsdSharingManager *manager)
                     service_is_enabled_on_current_connection (manager, service))
                         should_be_started = TRUE;
 
-                if (should_be_started)
-                        gsd_sharing_manager_start_service (manager, service);
-                else
-                        gsd_sharing_manager_stop_service (manager, service);
+                if (service->started != should_be_started) {
+                        if (service->started)
+                                gsd_sharing_manager_stop_service (manager, service);
+                        else
+                                gsd_sharing_manager_start_service (manager, service);
+                }
         }
         g_list_free (services);
 }
-- 
2.13.5