[libvirt PATCH 2/2] vircgroup: rework virCgroupNewSelf

[Pavel Hrdina <phrdina@xxxxxxxxxx>]

With the introduction of `libvirt` sub-directory to the cgroup topology
some of the cgroup configuration was moved into that sub-directory
together with the VM processes.

LXC uses virCgroupNewSelf() in the container process to detect cgroups
in order to report various data from cgroups inside the container.

We need to properly detect the new `libvirt` sub-directory here
otherwise LXC will report incorrect data.

Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
---
 src/util/vircgroup.c  | 15 ++++++++++++++-
 tests/vircgrouptest.c |  2 ++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index 9918430cca..a6a409af3d 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -1024,7 +1024,20 @@ virCgroupNewNested(virCgroup *parent,
 int
 virCgroupNewSelf(virCgroup **group)
 {
-    return virCgroupNewDetect(-1, -1, group);
+    g_autoptr(virCgroup) newGroup = NULL;
+    g_autoptr(virCgroup) nested = NULL;
+
+    if (virCgroupNewDetect(-1, -1, &newGroup) < 0)
+        return -1;
+
+    if (virCgroupNewNested(newGroup, -1, false, -1, &nested) < 0)
+        return -1;
+
+    if (virCgroupExists(nested))
+        newGroup->nested = g_steal_pointer(&nested);
+
+    *group = g_steal_pointer(&newGroup);
+    return 0;
 }
 
 
diff --git a/tests/vircgrouptest.c b/tests/vircgrouptest.c
index e29bc094b1..848a9c7bb0 100644
--- a/tests/vircgrouptest.c
+++ b/tests/vircgrouptest.c
@@ -1019,7 +1019,9 @@ mymain(void)
     DETECT_MOUNTS("cgroups1");
     DETECT_MOUNTS("cgroups2");
     DETECT_MOUNTS("cgroups3");
+    fakerootdir = initFakeFS(NULL, "all-in-one");
     DETECT_MOUNTS("all-in-one");
+    cleanupFakeFS(fakerootdir);
     DETECT_MOUNTS_FAIL("no-cgroups");
     DETECT_MOUNTS("kubevirt");
     fakerootdir = initFakeFS("unified", NULL);
-- 
2.37.3