flatpak: check for flatpak at startup

This checks for flatpak-builder when the flatpak plugin is loaded. We
might want to delay this until the current build configuration is changed
for those that are not using flatpak.

plugins/flatpak/gbp-flatpak-workbench-addin.c

@@ -18,20 +18,49 @@
 
 #define G_LOG_DOMAIN "gbp-flatpak-workbench-addin"
 
+#include <glib/gi18n.h>
+
 #include "gbp-flatpak-workbench-addin.h"
 
 struct _GbpFlatpakWorkbenchAddin
 {
-  GObject             parent;
-  GSimpleActionGroup *actions;
-  IdeWorkbench       *workbench;
+  GObject              parent;
+
+  GSimpleActionGroup  *actions;
+  IdeWorkbench        *workbench;
+  IdeWorkbenchMessage *message;
 };
 
+static void
+query_packages_cb (GObject      *object,
+                   GAsyncResult *result,
+                   gpointer      user_data)
+{
+  GDBusConnection *bus = (GDBusConnection *)object;
+  g_autoptr(IdeWorkbenchMessage) message = user_data;
+  g_autoptr(GVariant) reply = NULL;
+  g_autoptr(GError) error = NULL;
+
+  g_assert (G_IS_DBUS_CONNECTION (bus));
+  g_assert (G_IS_ASYNC_RESULT (result));
+
+  reply = g_dbus_connection_call_finish (bus, result, &error);
+
+  if (reply != NULL)
+    {
+      gboolean installed = FALSE;
+
+      g_variant_get (reply, "(b)", &installed);
+      gtk_widget_set_visible (GTK_WIDGET (message), !installed);
+    }
+}
+
 static void
 gbp_flatpak_workbench_addin_load (IdeWorkbenchAddin *addin,
                                   IdeWorkbench      *workbench)
 {
   GbpFlatpakWorkbenchAddin *self = (GbpFlatpakWorkbenchAddin *)addin;
+  g_autoptr(GDBusConnection) bus = NULL;
   IdeContext *context;
 
   g_assert (GBP_IS_FLATPAK_WORKBENCH_ADDIN (self));
@@ -42,6 +71,34 @@ gbp_flatpak_workbench_addin_load (IdeWorkbenchAddin *addin,
   context = ide_workbench_get_context (workbench);
   if (context != NULL)
     gtk_widget_insert_action_group (GTK_WIDGET (workbench), "flatpak", G_ACTION_GROUP (self->actions));
+
+  self->message = g_object_new (IDE_TYPE_WORKBENCH_MESSAGE,
+                                "id", "org.gnome.builder.flatpak.install",
+                                "title", _("Your computer is missing flatpak-builder"),
+                                "subtitle", _("This program is necessary for building Flatpak applications. Would you like to install it?"),
+                                "show-close-button", TRUE,
+                                "visible", FALSE,
+                                NULL);
+  ide_workbench_message_add_action (self->message, _("Install"), "flatpak.install-flatpak-builder");
+  ide_workbench_push_message (workbench, self->message);
+
+  /*
+   * Discover if flatpak-builder is available, and if not, we will show the
+   * message bar to the user.
+   */
+  if (NULL != (bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL)))
+    g_dbus_connection_call (bus,
+                            "org.freedesktop.PackageKit",
+                            "/org/freedesktop/PackageKit",
+                            "org.freedesktop.PackageKit.Query",
+                            "IsInstalled",
+                            g_variant_new ("(ss)", "flatpak-builder", ""),
+                            G_VARIANT_TYPE ("(b)"),
+                            G_DBUS_CALL_FLAGS_NONE,
+                            -1,
+                            NULL,
+                            query_packages_cb,
+                            g_object_ref (self->message));
 }
 
 static void
@@ -55,6 +112,9 @@ gbp_flatpak_workbench_addin_unload (IdeWorkbenchAddin *addin,
 
   gtk_widget_insert_action_group (GTK_WIDGET (workbench), "flatpak", NULL);
 
+  gtk_widget_destroy (GTK_WIDGET (self->message));
+
+  self->message = NULL;
   self->workbench = NULL;
 }
 
@@ -100,8 +160,6 @@ gbp_flatpak_workbench_addin_export_cb (GObject      *object,
       g_warning ("%s", error->message);
       return;
     }
-
-  /* Open the directory containing the flatpak bundle */
 }
 
 static void
@@ -124,6 +182,66 @@ gbp_flatpak_workbench_addin_export (GSimpleAction *action,
                                    g_object_ref (self));
 }
 
+static void
+gbp_flatpak_workbench_addin_install_cb (GObject      *object,
+                                        GAsyncResult *result,
+                                        gpointer      user_data)
+{
+  IdeTransferManager *manager = (IdeTransferManager *)object;
+  g_autoptr(GbpFlatpakWorkbenchAddin) self = user_data;
+  g_autoptr(GError) error = NULL;
+  GAction *action;
+
+  g_assert (IDE_IS_TRANSFER_MANAGER (manager));
+  g_assert (G_IS_ASYNC_RESULT (result));
+  g_assert (GBP_IS_FLATPAK_WORKBENCH_ADDIN (self));
+
+  action = g_action_map_lookup_action (G_ACTION_MAP (self->actions),
+                                       "install-flatpak-builder");
+
+  if (!ide_transfer_manager_execute_finish (manager, result, &error))
+    /* TODO: Write to message bar */
+    g_warning ("%s", error->message);
+  else
+    gtk_widget_hide (GTK_WIDGET (self->message));
+
+  g_simple_action_set_enabled (G_SIMPLE_ACTION (action), TRUE);
+}
+
+static void
+gbp_flatpak_workbench_addin_install_flatpak_builder (GSimpleAction *action,
+                                                     GVariant      *param,
+                                                     gpointer       user_data)
+{
+  GbpFlatpakWorkbenchAddin *self = user_data;
+  g_autoptr(IdePkconTransfer) transfer = NULL;
+  IdeTransferManager *manager;
+  IdeContext *context;
+
+  static const gchar *packages[] = {
+    "flatpak",
+    "flatpak-builder",
+    NULL
+  };
+
+  IDE_ENTRY;
+
+  g_assert (G_IS_SIMPLE_ACTION (action));
+  g_assert (GBP_IS_FLATPAK_WORKBENCH_ADDIN (self));
+
+  transfer = ide_pkcon_transfer_new (packages);
+  context = ide_workbench_get_context (self->workbench);
+  manager = ide_context_get_transfer_manager (context);
+
+  ide_transfer_manager_execute_async (manager,
+                                      IDE_TRANSFER (transfer),
+                                      NULL,
+                                      gbp_flatpak_workbench_addin_install_cb,
+                                      g_object_ref (self));
+
+  IDE_EXIT;
+}
+
 G_DEFINE_TYPE_EXTENDED (GbpFlatpakWorkbenchAddin, gbp_flatpak_workbench_addin, G_TYPE_OBJECT, 0,
                         G_IMPLEMENT_INTERFACE (IDE_TYPE_WORKBENCH_ADDIN, workbench_addin_iface_init))
 
@@ -151,6 +269,7 @@ gbp_flatpak_workbench_addin_init (GbpFlatpakWorkbenchAddin *self)
   static const GActionEntry actions[] = {
     { "update-dependencies", gbp_flatpak_workbench_addin_update_dependencies },
     { "export", gbp_flatpak_workbench_addin_export },
+    { "install-flatpak-builder", gbp_flatpak_workbench_addin_install_flatpak_builder },
   };
 
   self->actions = g_simple_action_group_new ();