ftests: add code to stress cgroup_init()

This test case stress cgroup_init(), by trying to create 102 mount
points and indirectly testing the cgroup initialization code, which
would populate the cg_mount_table[] and controllers[].

-----------------------------------------------------------------
Test Results:
        Run Date:                          May 17 11:05:47
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                          Time (sec)
        ----------------------------------------
        setup                               0.00
        999-stress-cgroup_init.py           1.91
        teardown                            0.00
        ----------------------------------------
        Total Run Time                      1.91

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

diff --git a/ftests/999-stress-cgroup_init.py b/ftests/999-stress-cgroup_init.py
new file mode 100755 (executable)
index 0000000..0127c86
--- /dev/null
+++ b/ftests/999-stress-cgroup_init.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: LGPL-2.1-only
+#
+# Stressing cgroup_int() code
+#
+# Copyright (c) 2022 Oracle and/or its affiliates.  All rights reserved.
+# Author: Kamalesh Babulal <kamalesh.babulal@oracle.com>
+#
+
+from libcgroup import Cgroup
+from run import Run
+import consts
+import ftests
+import sys
+import os
+
+MNT_COUNT = 101
+MNT_POINT = '/tmp/999stress/'
+DIR_PREFIX = 'name'
+
+
+def cgroup_path(count):
+    return MNT_POINT + DIR_PREFIX + str(count)
+
+
+def prereqs(config):
+    return consts.TEST_PASSED, None
+
+
+def setup(config):
+    cmd = ['sudo', 'mkdir']
+
+    cmd.append(MNT_POINT)
+
+    for count in range(MNT_COUNT):
+        cmd.append(cgroup_path(count))
+
+    # execute mkdir top-level top-level/sub-directory* at once.
+    Run.run(cmd)
+
+    for count in range(MNT_COUNT):
+        cmd = ['sudo', 'mount', '-t', 'cgroup', '-o']
+        cmd.append('none,name=' + DIR_PREFIX + str(count))
+        cmd.append('none')
+        cmd.append(cgroup_path(count))
+        Run.run(cmd)
+
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    try:
+        Cgroup.cgroup_init()
+    except RuntimeError as re:
+        if 'Failed to initialize libcgroup: 50008' not in str(re):
+            cause = str(re)
+            result = consts.TEST_FAILED
+
+    return result, cause
+
+
+def teardown(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    for count in range(MNT_COUNT):
+        cmd = ['sudo', 'umount']
+        cmd.append(cgroup_path(count))
+        Run.run(cmd)
+
+    cmd = ['sudo', 'rmdir']
+    for count in range(MNT_COUNT):
+        cmd.append(cgroup_path(count))
+
+    cmd.append(MNT_POINT)
+
+    # execute rmdir top-level top-level/sub-directory* at once.
+    Run.run(cmd)
+
+    return result, cause
+
+
+def main(config):
+    [result, cause] = prereqs(config)
+    if result != consts.TEST_PASSED:
+        return [result, cause]
+
+    setup(config)
+    [result, cause] = test(config)
+    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))
+
+# vim: set et ts=4 sw=4: