system-helper: Fix deploys of local remotes

For updates in remotes with a local (file:) uri we just do a deploy
with a LOCAL_PULL flag set and an empty arg_repo_path. However, our
arg_repo_path checking at some point seemed to stop properly handling
the case where it is empty. I got it to report "No such file" wich
broke the tests.

system-helper/flatpak-system-helper.c

@@ -410,61 +410,64 @@ handle_deploy (FlatpakSystemHelper *object,
  return G_DBUS_METHOD_INVOCATION_HANDLED;
  }
 
- src_dir = g_path_get_dirname (arg_repo_path);
- ongoing_pull = take_ongoing_pull_by_dir (src_dir);
- if (ongoing_pull != NULL)
+ if ((arg_flags & ~FLATPAK_HELPER_DEPLOY_FLAGS_ALL) != 0)
  {
- g_autoptr(GError) local_error = NULL;
- uid_t uid;
+ g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
+ "Unsupported flags enabled: 0x%x", (arg_flags & ~FLATPAK_HELPER_DEPLOY_FLAGS_ALL));
+ return G_DBUS_METHOD_INVOCATION_HANDLED;
+ }
 
- /* Ensure that pull's uid is same as the caller's uid */
- if (!get_connection_uid (invocation, &uid, &local_error))
+ if (strlen (arg_repo_path) > 0)
+ {
+ if (!g_file_query_exists (repo_file, NULL))
  {
- g_dbus_method_invocation_return_gerror (invocation, local_error);
+ g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
+ "Path does not exist");
  return G_DBUS_METHOD_INVOCATION_HANDLED;
  }
- else
+
+ src_dir = g_path_get_dirname (arg_repo_path);
+ ongoing_pull = take_ongoing_pull_by_dir (src_dir);
+ if (ongoing_pull != NULL)
  {
- if (ongoing_pull->uid != uid)
+ g_autoptr(GError) local_error = NULL;
+ uid_t uid;
+
+ /* Ensure that pull's uid is same as the caller's uid */
+ if (!get_connection_uid (invocation, &uid, &local_error))
  {
- g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
- "Ongoing pull's uid(%d) does not match with peer uid(%d)",
- ongoing_pull->uid, uid);
+ g_dbus_method_invocation_return_gerror (invocation, local_error);
  return G_DBUS_METHOD_INVOCATION_HANDLED;
  }
- }
-
- terminate_revokefs_backend (ongoing_pull);
-
- if (!flatpak_canonicalize_permissions (AT_FDCWD,
- arg_repo_path,
- getuid() == 0 ? 0 : -1,
- getuid() == 0 ? 0 : -1,
- &local_error))
- {
- g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
- "Failed to canonicalize permissions of repo %s: %s",
- arg_repo_path, local_error->message);
- return G_DBUS_METHOD_INVOCATION_HANDLED;
- }
+ else
+ {
+ if (ongoing_pull->uid != uid)
+ {
+ g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
+ "Ongoing pull's uid(%d) does not match with peer uid(%d)",
+ ongoing_pull->uid, uid);
+ return G_DBUS_METHOD_INVOCATION_HANDLED;
+ }
+ }
 
- /* At this point, the cache-dir's repo is owned by root. Hence, any failure
- * from here on, should always cleanup the cache-dir and not preserve it to be re-used. */
- ongoing_pull->preserve_pull = FALSE;
- }
+ terminate_revokefs_backend (ongoing_pull);
 
- if ((arg_flags & ~FLATPAK_HELPER_DEPLOY_FLAGS_ALL) != 0)
- {
- g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
- "Unsupported flags enabled: 0x%x", (arg_flags & ~FLATPAK_HELPER_DEPLOY_FLAGS_ALL));
- return G_DBUS_METHOD_INVOCATION_HANDLED;
- }
+ if (!flatpak_canonicalize_permissions (AT_FDCWD,
+ arg_repo_path,
+ getuid() == 0 ? 0 : -1,
+ getuid() == 0 ? 0 : -1,
+ &local_error))
+ {
+ g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_FAILED,
+ "Failed to canonicalize permissions of repo %s: %s",
+ arg_repo_path, local_error->message);
+ return G_DBUS_METHOD_INVOCATION_HANDLED;
+ }
 
- if (!g_file_query_exists (repo_file, NULL))
- {
- g_dbus_method_invocation_return_error (invocation, G_DBUS_ERROR, G_DBUS_ERROR_INVALID_ARGS,
- "Path does not exist");
- return G_DBUS_METHOD_INVOCATION_HANDLED;
+ /* At this point, the cache-dir's repo is owned by root. Hence, any failure
+ * from here on, should always cleanup the cache-dir and not preserve it to be re-used. */
+ ongoing_pull->preserve_pull = FALSE;
+ }
  }
 
  ref = flatpak_decomposed_new_from_ref (arg_ref, &error);