ftests: Add cgget test with '-r' flag and two cgroups

Add a test that exercises the '-r' <name> <cgroup1> <cgroup2>
option in cgget.  This test verifies the following cgget
operation:

	$ cgget -r memory.limit_in_bytes 011cgget1 011cgget2

-----------------------------------------------------------------
Test Results:
        Run Date:                          Feb 09 21:24:10
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                    Time (sec)
        ---------------------------------------------------------
        setup                                        17.28
        011-cgget-r_flag_two_cgroups.py               1.47
        teardown                                      0.00
        ---------------------------------------------------------
        Total Run Time                               18.76

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

diff --git a/ftests/011-cgget-r_flag_two_cgroups.py b/ftests/011-cgget-r_flag_two_cgroups.py
new file mode 100755 (executable)
index 0000000..f245680
--- /dev/null
+++ b/ftests/011-cgget-r_flag_two_cgroups.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python3
+#
+# Advanced cgget functionality test - '-r' <name> <cgroup1> <cgroup2>
+#
+# 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 = 'memory'
+CGNAME1 = '011cgget1'
+CGNAME2 = '011cgget2'
+
+SETTING = 'memory.limit_in_bytes'
+VALUE = '2048000'
+
+EXPECTED_OUT = '''011cgget1:
+memory.limit_in_bytes: 2048000
+
+011cgget2:
+memory.limit_in_bytes: 2048000
+'''
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    return result, cause
+
+def setup(config):
+    Cgroup.create(config, CONTROLLER, CGNAME1)
+    Cgroup.create(config, CONTROLLER, CGNAME2)
+    Cgroup.set(config, CGNAME1, SETTING, VALUE)
+    Cgroup.set(config, CGNAME2, SETTING, VALUE)
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    out = Cgroup.get(config, controller=None, cgname=[CGNAME1, CGNAME2],
+                     setting=SETTING)
+
+    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, CGNAME1)
+    Cgroup.delete(config, CONTROLLER, CGNAME2)
+
+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))