ftests: Add cgexec test for empty cgroup

Add a cgexec test for attaching a task to an empty cgroup without any
controller.

-----------------------------------------------------------------
Test Results:
        Run Date:                          Apr 21 04:54:42
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                   Time (sec)
        -------------------------------------------------
        setup                                        0.00
        046-cgexec-empty_controller.py               2.09
        teardown                                     0.00
        -------------------------------------------------
        Total Run Time                               2.09

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
TJH: Minor change to disable printing the headers

diff --git a/ftests/046-cgexec-empty_controller.py b/ftests/046-cgexec-empty_controller.py
new file mode 100755 (executable)
index 0000000..ba8716d
--- /dev/null
+++ b/ftests/046-cgexec-empty_controller.py
@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+#
+# cgexec to an empty cgroup functionality test using the python bindings
+#
+# Copyright (c) 2022 Oracle and/or its affiliates.
+# Author: Kamalesh Babulal <kamalesh.babulal@oracle.com>
+#
+
+from cgroup import Cgroup, CgroupVersion
+from run import Run
+import consts
+import ftests
+import sys
+import os
+
+CONTROLLER = 'cpu'
+CGNAME = '046cgexec'
+
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    if CgroupVersion.get_version(CONTROLLER) != CgroupVersion.CGROUP_V2:
+        result = consts.TEST_SKIPPED
+        cause = 'This test requires cgroup v2'
+
+    return result, cause
+
+
+def setup(config):
+    Cgroup.create(config, None, cgname=CGNAME)
+
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    config.process.create_process_in_cgroup(config, '', CGNAME)
+    output = Cgroup.get(
+                         config, controller=None, cgname=CGNAME,
+                         setting='cgroup.procs', print_headers=False,
+                         values_only=False
+                        )
+
+    if not len(output):
+        result = consts.TEST_FAILED
+        cause = 'No process created in the cgroup'
+
+    return result, cause
+
+
+def teardown(config):
+    pids = Cgroup.get_pids_in_cgroup(config, CGNAME, CONTROLLER)
+    if pids:
+        for p in pids.splitlines():
+            if config.args.container:
+                config.container.run(['kill', '-9', p])
+            else:
+                Run.run(['sudo', 'kill', '-9', p])
+
+    Cgroup.delete(config, None, CGNAME)
+
+
+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: