static int detect_unified_cgroup_hierarchy_from_image(const char *directory) {
int r;
- /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd in the
- * image actually supports. */
+ /* Let's inherit the mode to use from the host system, but let's take into consideration what systemd
+ * in the image actually supports. */
r = cg_all_unified();
if (r < 0)
return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
static int verify_arguments(void) {
int r;
+ if (arg_start_mode == START_PID2 && arg_unified_cgroup_hierarchy == CGROUP_UNIFIED_UNKNOWN) {
+ /* If we are running the stub init in the container, we don't need to look at what the init
+ * in the container supports, because we are not using it. Let's immediately pick the right
+ * setting based on the host system configuration.
+ *
+ * We only do this, if the user didn't use an environment variable to override the detection.
+ */
+
+ r = cg_all_unified();
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether we are in all unified mode.");
+ if (r > 0)
+ arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_ALL;
+ else if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0)
+ arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_SYSTEMD;
+ else
+ arg_unified_cgroup_hierarchy = CGROUP_UNIFIED_NONE;
+ }
+
if (arg_userns_mode != USER_NAMESPACE_NO)
arg_mount_settings |= MOUNT_USE_USERNS;