cgroup-util: debug log if /proc/self/ns/cgroup is not available for unexpected reasons

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index 19723d30843cd457ac4e6ebf388e2cb07c9ca762..65ca6f2f504b81a471bf3ef43ea179a968a52192 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -129,10 +129,12 @@ bool cg_ns_supported(void) {
         if (enabled >= 0)
                 return enabled;
 
-        if (access("/proc/self/ns/cgroup", F_OK) == 0)
-                enabled = 1;
-        else
-                enabled = 0;
+        if (access("/proc/self/ns/cgroup", F_OK) < 0) {
+                if (errno != ENOENT)
+                        log_debug_errno(errno, "Failed to check whether /proc/self/ns/cgroup is available, assuming not: %m");
+                enabled = false;
+        } else
+                enabled = true;
 
         return enabled;
 }