ftests: Add a test to get/set cgroup.type

Add a functional test that can get/set cgroup.type on a
cgroup v2 filesystem.

-----------------------------------------------------------------
Test Results:
        Run Date:                          Dec 06 14:40:46
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                             Time (sec)
        -------------------------------------------
        setup                                  0.00
        035-cgset-set_cgroup_type.py           2.30
        teardown                               0.00
        -------------------------------------------
        Total Run Time                         2.30

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
(cherry picked from commit 9ba430f59d780b5670e2c58bba94fed9266a190e)

diff --git a/ftests/035-cgset-set_cgroup_type.py b/ftests/035-cgset-set_cgroup_type.py
new file mode 100755 (executable)
index 0000000..7015950
--- /dev/null
+++ b/ftests/035-cgset-set_cgroup_type.py
@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+#
+# cgget/cgset cgroup.type 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
+
+# Which controller isn't all that important, but it is important that we
+# have a cgroup v2 controller
+CONTROLLER = 'cpu'
+CGNAME = "035cgset"
+
+SETTING = 'cgroup.type'
+BEFORE = 'domain'
+AFTER = 'threaded'
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    if config.args.container:
+        result = consts.TEST_SKIPPED
+        cause = "This test cannot be run within a container"
+        return result, cause
+
+    if CgroupVersion.get_version(CONTROLLER) != CgroupVersion.CGROUP_V2:
+        result = consts.TEST_SKIPPED
+        cause = "This test requires cgroup v2"
+
+    return result, cause
+
+def setup(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    Cgroup.create(config, CONTROLLER, CGNAME)
+
+
+    before = Cgroup.get(config, controller=None, cgname=CGNAME,
+                        setting=SETTING, print_headers=False,
+                        values_only=True)
+    if before != BEFORE:
+        result = consts.TEST_SKIPPED
+        cause = "Skipping test.  Unexpected value in {}: {}".format(SETTING,
+                    before)
+
+    return result, cause
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    Cgroup.set(config, CGNAME, SETTING, AFTER)
+
+    after = Cgroup.get(config, controller=None, cgname=CGNAME,
+                       setting=SETTING, print_headers=False,
+                       values_only=True)
+
+    if after != AFTER:
+        result = consts.TEST_FAILED
+        cause = "cgget expected {} but received {}".format(AFTER, after)
+
+    return result, cause
+
+def teardown(config):
+    Cgroup.delete(config, CONTROLLER, CGNAME)
+
+def main(config):
+    [result, cause] = prereqs(config)
+    if result != consts.TEST_PASSED:
+        return [result, cause]
+
+    setup(config)
+    if result != consts.TEST_PASSED:
+        return [result, cause]
+
+    [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))