ftests: Add cgget test with '-g' <controller> flag

Add a test that exercises the '-g' <controller> option
in cgget.  This test verifies the following cgget operation:

	$ cgget -g cpu 009cgget

-----------------------------------------------------------------
Test Results:
        Run Date:                          Feb 09 20:49:33
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                    Time (sec)
        ---------------------------------------------------------
        setup                                        21.28
        009-cgget-g_flag_controller_only.py           0.57
        teardown                                      0.00
        ---------------------------------------------------------
        Total Run Time                               21.85

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

diff --git a/ftests/009-cgget-g_flag_controller_only.py b/ftests/009-cgget-g_flag_controller_only.py
new file mode 100755 (executable)
index 0000000..155369c
--- /dev/null
+++ b/ftests/009-cgget-g_flag_controller_only.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+#
+# Advanced cgget functionality test - '-g' <controller>
+#
+# 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
+
+CONTROLLER = 'cpu'
+CGNAME = '009cgget'
+
+EXPECTED_OUT = '''009cgget:
+cpu.cfs_period_us: 100000
+cpu.stat: nr_periods 0
+        nr_throttled 0
+        throttled_time 0
+cpu.shares: 1024
+cpu.cfs_quota_us: -1
+cpu.uclamp.min: 0.00
+cpu.uclamp.max: max
+'''
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    return result, cause
+
+def setup(config):
+    Cgroup.create(config, CONTROLLER, CGNAME)
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    out = Cgroup.get(config, controller=CONTROLLER, cgname=CGNAME)
+
+    for line_num, line in enumerate(out.splitlines()):
+        if line.strip() != EXPECTED_OUT.splitlines()[line_num].strip():
+            result = consts.TEST_FAILED
+            cause = "Expected line:\n\t{}\nbut received line:\n\t{}".format(
+                    EXPECTED_OUT.splitlines()[line_num].strip(), line.strip())
+            return result, cause
+
+    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)
+    [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))