bus_config_parser_get_watched_dirs: Turn into a helper function

This means we can test it more easily. At the moment it just
contains service directories, because this config file is so
cut-down that it doesn't have any config.d directories.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=99825
Reviewed-by: Philip Withnall <withnall@endlessm.com>
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>

bus/bus.c

@@ -670,32 +670,6 @@ process_config_every_time (BusContext      *context,
   return retval;
 }
 
-static dbus_bool_t
-list_concat_new (DBusList **a,
-                 DBusList **b,
-                 DBusList **result)
-{
-  DBusList *link;
-
-  *result = NULL;
-
-  for (link = _dbus_list_get_first_link (a); link; link = _dbus_list_get_next_link (a, link))
-    {
-      if (!_dbus_list_append (result, link->data))
-        goto oom;
-    }
-  for (link = _dbus_list_get_first_link (b); link; link = _dbus_list_get_next_link (b, link))
-    {
-      if (!_dbus_list_append (result, link->data))
-        goto oom;
-    }
-
-  return TRUE;
-oom:
-  _dbus_list_clear (result);
-  return FALSE;
-}
-
 static void
 raise_file_descriptor_limit (BusContext      *context)
 {
@@ -756,9 +730,7 @@ process_config_postinit (BusContext      *context,
   /* We need to monitor both the configuration directories and directories
    * containing .service files.
    */
-  if (!list_concat_new (bus_config_parser_get_conf_dirs (parser),
-                        bus_config_parser_get_service_dirs (parser),
-                        &watched_dirs))
+  if (!bus_config_parser_get_watched_dirs (parser, &watched_dirs))
     {
       BUS_SET_OOM (error);
       return FALSE;

bus/config-parser.c

@@ -2789,6 +2789,46 @@ bus_config_parser_steal_service_context_table (BusConfigParser *parser)
   return table;
 }
 
+/*
+ * Return a list of the directories that should be watched with inotify,
+ * as strings. The list might be empty and is in arbitrary order.
+ *
+ * The list must be empty on entry. On success, the links are owned by the
+ * caller and must be freed, but the data in each link remains owned by
+ * the BusConfigParser and must not be freed: in GObject-Introspection
+ * notation, it is (transfer container).
+ */
+dbus_bool_t
+bus_config_parser_get_watched_dirs (BusConfigParser *parser,
+                                    DBusList **watched_dirs)
+{
+  DBusList *link;
+
+  _dbus_assert (*watched_dirs == NULL);
+
+  for (link = _dbus_list_get_first_link (&parser->conf_dirs);
+       link != NULL;
+       link = _dbus_list_get_next_link (&parser->conf_dirs, link))
+    {
+      if (!_dbus_list_append (watched_dirs, link->data))
+        goto oom;
+    }
+
+  for (link = _dbus_list_get_first_link (&parser->service_dirs);
+       link != NULL;
+       link = _dbus_list_get_next_link (&parser->service_dirs, link))
+    {
+      if (!_dbus_list_append (watched_dirs, link->data))
+        goto oom;
+    }
+
+  return TRUE;
+
+oom:
+  _dbus_list_clear (watched_dirs);
+  return FALSE;
+}
+
 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
 #include <stdio.h>
 
@@ -3399,6 +3439,7 @@ test_default_session_servicedirs (const DBusString *test_base_dir)
   BusConfigParser *parser = NULL;
   DBusError error = DBUS_ERROR_INIT;
   DBusList **dirs;
+  DBusList *watched_dirs = NULL;
   DBusList *link;
   DBusString tmp;
   DBusString full_path;
@@ -3534,12 +3575,47 @@ test_default_session_servicedirs (const DBusString *test_base_dir)
       goto out;
     }
 
+  if (!bus_config_parser_get_watched_dirs (parser, &watched_dirs))
+    _dbus_assert_not_reached ("out of memory");
+
+  for (link = _dbus_list_get_first_link (&watched_dirs), i = 0;
+       link != NULL;
+       link = _dbus_list_get_next_link (&watched_dirs, link), i++)
+    {
+      printf ("    watched service dir: '%s'\n", (const char *) link->data);
+      printf ("    current standard service dir: '%s'\n",
+              test_session_service_dir_matches[i]);
+
+      if (test_session_service_dir_matches[i] == NULL)
+        {
+          printf ("more directories parsed than in match set\n");
+          goto out;
+        }
+
+      if (strcmp (test_session_service_dir_matches[i],
+                  (const char *) link->data) != 0)
+        {
+          printf ("'%s' directory does not match '%s' in the match set\n",
+                  (const char *) link->data,
+                  test_session_service_dir_matches[i]);
+          goto out;
+        }
+    }
+
+  if (test_session_service_dir_matches[i] != NULL)
+    {
+      printf ("extra data %s in the match set was not matched\n",
+              test_session_service_dir_matches[i]);
+      goto out;
+    }
+
   ret = TRUE;
 
 out:
   if (parser != NULL)
     bus_config_parser_unref (parser);
 
+  _dbus_list_clear (&watched_dirs);
   _dbus_string_free (&full_path);
   _dbus_string_free (&install_root_based);
   _dbus_string_free (&progs);

bus/config-parser.h

@@ -73,6 +73,8 @@ DBusList**  bus_config_parser_get_conf_dirs    (BusConfigParser *parser);
 BusPolicy*  bus_config_parser_steal_policy     (BusConfigParser *parser);
 void        bus_config_parser_get_limits       (BusConfigParser *parser,
                                                 BusLimits       *limits);
+dbus_bool_t bus_config_parser_get_watched_dirs (BusConfigParser  *parser,
+                                                DBusList        **watched_dirs);
 
 DBusHashTable* bus_config_parser_steal_service_context_table (BusConfigParser *parser);