From f723740871bd3eb89d16a526a1ff77c04bb3787a Mon Sep 17 00:00:00 2001
From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Tue, 1 Feb 2022 20:18:29 +0100
Subject: [PATCH 1/2] test: introduce `get_cgroup_hierarchy() helper

which returns the host's cgroup hierarchy (unified, hybrid, or legacy).
---
 test/test-functions | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/test/test-functions b/test/test-functions
index 3ae8caed3fb..d79c52c5911 100644
--- a/test/test-functions
+++ b/test/test-functions
@@ -2010,6 +2010,24 @@ import_initdir() {
     export initdir
 }
 
+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
+            ;;
+        *)
+            dfatal "Failed to determine host's cgroup hierarchy"
+            exit 1
+    esac
+}
+
 ## @brief Converts numeric logging level to the first letter of level name.
 #
 # @param lvl Numeric logging level in range from 1 to 6.

From e2620820188428de7086f5e8ac41305177f70954 Mon Sep 17 00:00:00 2001
From: Frantisek Sumsal <frantisek@sumsal.cz>
Date: Tue, 1 Feb 2022 20:25:00 +0100
Subject: [PATCH 2/2] test: require unified cgroup hierarchy for TEST-56

since cgroup empty notifications are unreliable in legacy cgroups.

See: systemd/systemd#22320
Complements: systemd/systemd#22344
---
 test/TEST-56-EXIT-TYPE/test.sh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/test/TEST-56-EXIT-TYPE/test.sh b/test/TEST-56-EXIT-TYPE/test.sh
index 0f84dca1ba6..37475e817e1 100755
--- a/test/TEST-56-EXIT-TYPE/test.sh
+++ b/test/TEST-56-EXIT-TYPE/test.sh
@@ -6,4 +6,9 @@ TEST_DESCRIPTION="test ExitType=cgroup"
 # shellcheck source=test/test-functions
 . "${TEST_BASE_DIR:?}/test-functions"
 
+if [[ "$(get_cgroup_hierarchy)" != unified ]]; then
+    echo "This test requires unified cgroup hierarchy, skipping..."
+    exit 0
+fi
+
 do_test "$@"