ftests: Add basic lssubsys test

Add a functional test that exercises lssubsys with no flags.

-----------------------------------------------------------------
Test Results:
        Run Date:                          Mar 24 19:09:14
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                    Time (sec)
        ---------------------------------------------------------
        setup                                        23.47
        029-lssubsys-basic_lssubsys.py                0.15
        teardown                                      0.00
        --------------------------------------------------

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

diff --git a/ftests/029-lssubsys-basic_lssubsys.py b/ftests/029-lssubsys-basic_lssubsys.py
new file mode 100755 (executable)
index 0000000..bab3edc
--- /dev/null
+++ b/ftests/029-lssubsys-basic_lssubsys.py
@@ -0,0 +1,95 @@
+#!/usr/bin/env python3
+#
+# Basic lssubsys functionality test
+#
+# Copyright (c) 2021 Oracle and/or its affiliates.
+# Author: Tom Hromatka <tom.hromatka@oracle.com>
+#
+
+#
+# This library is free software; you can redistribute it and/or modify it
+# under the terms of version 2.1 of the GNU Lesser General Public License as
+# published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+# for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library; if not, see <http://www.gnu.org/licenses>.
+#
+
+from cgroup import Cgroup, CgroupVersion
+import consts
+import ftests
+import os
+import sys
+import utils
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    return result, cause
+
+def setup(config):
+    pass
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    mount_list = Cgroup.get_cgroup_mounts(config, expand_v2_mounts=False)
+
+    # cgroup v2 mounts won't show up unless '-a' is specified
+    lssubsys_list = Cgroup.lssubsys(config, ls_all=False)
+
+    for mount in mount_list:
+        if mount.version == CgroupVersion.CGROUP_V2:
+            continue
+
+        if mount.controller == "name=systemd" or mount.controller == "systemd":
+            continue
+
+        found = False
+        for lsmount in lssubsys_list.splitlines():
+            if ',' in lsmount:
+                for ctrl in lsmount.split(','):
+                    if ctrl == mount.controller:
+                        found = True
+                        break
+
+            if lsmount == mount.controller:
+                found = True
+                break
+
+        if not found:
+            result = consts.TEST_FAILED
+            cause = "Failed to find {} in lssubsys list".format(
+                      mount.controller)
+            return result, cause
+
+    return result, cause
+
+def teardown(config):
+    pass
+
+def main(config):
+    [result, cause] = prereqs(config)
+    if result != consts.TEST_PASSED:
+        return [result, cause]
+
+    try:
+        setup(config)
+        [result, cause] = test(config)
+    finally:
+        teardown(config)
+
+    return [result, cause]
+
+if __name__ == '__main__':
+    config = ftests.parse_args()
+    # this test was invoked directly.  run only it
+    config.args.num = int(os.path.basename(__file__).split('-')[0])
+    sys.exit(ftests.main(config))