utils: Introduce XDP_APP_INFO_KIND_CONTAINERS1

This new app kind is authenticated by D-Bus and x-d-p gets all the
information about the app from D-Bus which itself get the information
from the sandbox engine which set up the sandbox of the app.

Currently only flatpak and dbus (dbus-daemon) supports this mechanism
but it can be supported by any other sandbox engine, such as snap and
firejail.

This also means that an app with XDP_APP_INFO_KIND_CONTAINERS1 can still
be a flatpak or a snap app.

The goal is to make as many paths in x-d-p agnostic to the actual
sandbox engine and handle all XDP_APP_INFO_KIND_CONTAINERS1 apps the
same. Eventually we can then remove any other XDP_APP_INFO_KIND
variants.

This commit sets up a XdpAppInfo object with all the metadata x-d-p will
need. The follow up commit implements various XdpAppInfo
functionalities.

src/xdp-utils.c

@@ -144,6 +144,14 @@ struct _XdpAppInfo {
         {
           GKeyFile *keyfile;
         } snap;
+      struct
+        {
+          char *container_type;
+          char *instance_id;
+          int pidfd;
+          char *desktop_file;
+          gboolean has_network;
+        } containers1;
     } u;
 };
 
@@ -266,6 +274,13 @@ xdp_app_info_free (XdpAppInfo *app_info)
       g_clear_pointer (&app_info->u.snap.keyfile, g_key_file_free);
       break;
 
+    case XDP_APP_INFO_KIND_CONTAINERS1:
+      g_clear_pointer (&app_info->u.containers1.container_type, g_free);
+      g_clear_pointer (&app_info->u.containers1.instance_id, g_free);
+      g_clear_pointer (&app_info->u.containers1.desktop_file, g_free);
+      xdp_close_fd (&app_info->u.containers1.pidfd);
+      break;
+
     default:
       break;
     }
@@ -844,7 +859,45 @@ xdp_app_info_from_containers1 (GVariant  *containers1_data,
                                int        pidfd,
                                GError   **error)
 {
-  return NULL;
+  XdpAppInfo *app_info = NULL;
+  const char *container_type;
+  const char *app_id;
+  const char *instance_id;
+  GVariant *metadata;
+  const char *desktop_file;
+  gboolean network_access;
+
+  if (!containers1_data || pidfd < 0)
+    return NULL;
+
+  g_variant_get (containers1_data, "(o@a{sv}sss@a{sv})",
+                 NULL,
+                 NULL,
+                 &container_type,
+                 &app_id,
+                 &instance_id,
+                 &metadata);
+
+  if (!app_id || !instance_id || !container_type)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "Bad Containers1 metadata");
+      return NULL;
+    }
+
+  app_info = xdp_app_info_new (XDP_APP_INFO_KIND_CONTAINERS1);
+  app_info->id = g_strdup (app_id);
+  app_info->u.containers1.container_type = g_strdup (container_type);
+  app_info->u.containers1.instance_id = g_strdup (instance_id);
+  app_info->u.containers1.pidfd = pidfd;
+
+  if (g_variant_lookup (metadata, "DesktopFile", "&s", &desktop_file))
+    app_info->u.containers1.desktop_file = g_strdup (desktop_file);
+
+  app_info->u.containers1.has_network = TRUE;
+  if (g_variant_lookup (metadata, "NetworkAccess", "b", &network_access))
+    app_info->u.containers1.has_network = network_access;
+
+  return app_info;
 }
 
 static gboolean

src/xdp-utils.h

@@ -48,9 +48,10 @@
 
 typedef enum
 {
-  XDP_APP_INFO_KIND_HOST = 0,
-  XDP_APP_INFO_KIND_FLATPAK = 1,
-  XDP_APP_INFO_KIND_SNAP    = 2,
+  XDP_APP_INFO_KIND_HOST        = 0,
+  XDP_APP_INFO_KIND_FLATPAK     = 1,
+  XDP_APP_INFO_KIND_SNAP        = 2,
+  XDP_APP_INFO_KIND_CONTAINERS1 = 3,
 } XdpAppInfoKind;
 
 gint xdp_mkstempat (int    dir_fd,