From 5ff1c6fcde1699637eb328c069ecc693688b4639 Mon Sep 17 00:00:00 2001
From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Tue, 16 May 2023 19:11:51 +0200
Subject: [PATCH] test: introduce get_cgroup_hierarchy()

---
 test/units/util.sh | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/test/units/util.sh b/test/units/util.sh
index 00b8c5e3930..4e214251cc6 100755
--- a/test/units/util.sh
+++ b/test/units/util.sh
@@ -56,3 +56,21 @@ assert_rc() {(
     rc=$?
     assert_eq "$rc" "$exp"
 )}
+
+get_cgroup_hierarchy() {
+    case "$(stat -c '%T' -f /sys/fs/cgroup)" in
+        cgroup2fs)
+            echo "unified"
+            ;;
+        tmpfs)
+            if [[ -d /sys/fs/cgroup/unified && "$(stat -c '%T' -f /sys/fs/cgroup/unified)" == cgroup2fs ]]; then
+                echo "hybrid"
+            else
+                echo "legacy"
+            fi
+            ;;
+        *)
+            echo >&2 "Failed to determine host's cgroup hierarchy"
+            exit 1
+    esac
+}