systemd-nspawn: Clarify detect_unified_cgroup_hierarchy().

2 files changed, 12 insertions, 0 deletions

diff --git a/src/libsystemd-basic/include/systemd-basic/cgroup-util.h b/src/libsystemd-basic/include/systemd-basic/cgroup-util.h
index 0aa27c4cd7..d730f3490c 100644
--- a/src/libsystemd-basic/include/systemd-basic/cgroup-util.h
+++ b/src/libsystemd-basic/include/systemd-basic/cgroup-util.h
@@ -242,6 +242,7 @@ bool cg_ns_supported(void);
 
 int cg_all_unified(void);
 int cg_unified(const char *controller);
+int cg_version(CGroupUnified *ver);
 void cg_unified_flush(void);
 
 bool cg_is_unified_wanted(void);
diff --git a/src/libsystemd-basic/src/cgroup-util.c b/src/libsystemd-basic/src/cgroup-util.c
index cf9c682599..929101e558 100644
--- a/src/libsystemd-basic/src/cgroup-util.c
+++ b/src/libsystemd-basic/src/cgroup-util.c
@@ -2311,6 +2311,17 @@ int cg_all_unified(void) {
         return cg_unified(NULL);
 }
 
+int cg_version(CGroupUnified *ver) {
+        int r;
+
+        r = cg_update_unified();
+        if (r < 0)
+                return r;
+
+        *ver = unified_cache;
+        return 0;
+}
+
 void cg_unified_flush(void) {
         unified_cache = CGROUP_UNIFIED_UNKNOWN;
 }