cgroup: always read the supported controllers from the root cgroup of the local container

Otherwise we might end up thinking that we support more controllers than
actually enabled for the container we are running in.

diff --git a/src/basic/cgroup-util.c b/src/basic/cgroup-util.c
index fe8750d..388bd62 100644 (file)
--- a/src/basic/cgroup-util.c
+++ b/src/basic/cgroup-util.c
@@ -1981,14 +1981,22 @@ int cg_mask_supported(CGroupMask *ret) {
         if (unified < 0)
                 return unified;
         if (unified > 0) {
-                _cleanup_free_ char *controllers = NULL;
+                _cleanup_free_ char *root = NULL, *controllers = NULL, *path = NULL;
                 const char *c;
 
                 /* In the unified hierarchy we can read the supported
                  * and accessible controllers from a the top-level
                  * cgroup attribute */
 
-                r = read_one_line_file("/sys/fs/cgroup/cgroup.controllers", &controllers);
+                r = cg_get_root_path(&root);
+                if (r < 0)
+                        return r;
+
+                r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, root, "cgroup.controllers", &path);
+                if (r < 0)
+                        return r;
+
+                r = read_one_line_file(path, &controllers);
                 if (r < 0)
                         return r;
 

diff --git a/src/test/test-cgroup-util.c b/src/test/test-cgroup-util.c
index ecc9d70..ff7e459 100644 (file)
--- a/src/test/test-cgroup-util.c
+++ b/src/test/test-cgroup-util.c
@@ -295,6 +295,17 @@ static void test_shift_path(void) {
         test_shift_path_one("/foobar/waldo", "/fuckfuck", "/foobar/waldo");
 }
 
+static void test_mask_supported(void) {
+
+        CGroupMask m;
+        CGroupController c;
+
+        assert_se(cg_mask_supported(&m) >= 0);
+
+        for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
+                printf("'%s' is supported: %s\n", cgroup_controller_to_string(c), yes_no(m & CGROUP_CONTROLLER_TO_MASK(c)));
+}
+
 int main(void) {
         test_path_decode_unit();
         test_path_get_unit();
@@ -309,6 +320,7 @@ int main(void) {
         test_controller_is_valid();
         test_slice_to_path();
         test_shift_path();
+        test_mask_supported();
 
         return 0;
 }