[PATCH] selinux-testsuite: ensure the cgroups_label tests works on old and new systems

[Paul Moore <paul@xxxxxxxxxxxxxx>]

From: Paul Moore <paul@xxxxxxxxxxxxxx>

Commit 697efc910393 ("selinux-testsuite: fix the cgroups_label test")
fixed the cgroups_label test on new systems, but it broke old systems.
Try to use /sys/fs/cgroup/unified first and if that doesn't exist go
with the new approach introduced in the commit above.

Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx>
---
 tests/cgroupfs_label/test |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tests/cgroupfs_label/test b/tests/cgroupfs_label/test
index 385b953..91517b4 100755
--- a/tests/cgroupfs_label/test
+++ b/tests/cgroupfs_label/test
@@ -5,7 +5,11 @@ BEGIN { plan tests => 2 }
 
 my $ret;
 
-my $dir = "/sys/fs/cgroup/selinuxtest";
+# Older systems use /sys/fs/cgroup/unified, newer use /sys/fs/cgroup.
+my $dir = "/sys/fs/cgroup/unified";
+if (! -d $dir) {
+	$dir = "/sys/fs/cgroup/selinuxtest";
+}
 
 # Create a new cgroupfs directory and relabel it.
 mkdir("$dir");