cgfs: add print_cgfs_init_debuginfo()

Signed-off-by: Christian Brauner <christian.brauner@canonical.com>

diff --git a/src/lxc/cgfs.c b/src/lxc/cgfs.c
index bdbacf4785d66bb08bd131a600e7210598b61cab..4474c84726756a8438136316bc41a4bc41603aa8 100644 (file)
--- a/src/lxc/cgfs.c
+++ b/src/lxc/cgfs.c
@@ -2261,6 +2261,33 @@ static bool init_cpuset_if_needed(struct cgroup_mount_point *mp,
                do_init_cpuset_file(mp, path, "/cpuset.mems") );
 }
 
+static void print_cgfs_init_debuginfo(struct cgfs_data *d)
+{
+       int i;
+
+       if (!getenv("LXC_DEBUG_CGFS"))
+               return;
+
+       DEBUG("Cgroup information:");
+       DEBUG("  container name: %s", d->name);
+       if (!d->meta || !d->meta->hierarchies) {
+               DEBUG("  No hierarchies found.");
+               return;
+       }
+       DEBUG("  Controllers:");
+       for (i = 0; i <= d->meta->maximum_hierarchy; i++) {
+               char **p;
+               struct cgroup_hierarchy *h = d->meta->hierarchies[i];
+               if (!h) {
+                       DEBUG("     Empty hierarchy number %d.", i);
+                       continue;
+               }
+               for (p = h->subsystems; p && *p; p++) {
+                       DEBUG("     %2d: %s", i, *p);
+               }
+       }
+}
+
 struct cgroup_ops *cgfs_ops_init(void)
 {
        return &cgfs_ops;
@@ -2286,6 +2313,9 @@ static void *cgfs_init(const char *name)
                ERROR("cgroupfs failed to detect cgroup metadata");
                goto err2;
        }
+
+       print_cgfs_init_debuginfo(d);
+
        return d;
 
 err2: