ftests: Add cgroup v1 cgsnapshot test

Add a cgroup v1 cgsnapshot test.

-----------------------------------------------------------------
Test Results:
	Run Date:                          Dec 17 22:13:22
	Passed:                                  1 test(s)
	Skipped:                                 0 test(s)
	Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
	Test                                    Time (sec)
	---------------------------------------------------------
	setup                                        18.66
	004-cgsnapshot-basic_snapshot_v1.py           0.47
	teardown                                      0.00
	---------------------------------------------------------
	Total Run Time                               19.14

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

diff --git a/ftests/004-cgsnapshot-basic_snapshot_v1.py b/ftests/004-cgsnapshot-basic_snapshot_v1.py
new file mode 100755 (executable)
index 0000000..7075031
--- /dev/null
+++ b/ftests/004-cgsnapshot-basic_snapshot_v1.py
@@ -0,0 +1,101 @@
+#!/usr/bin/env python3
+#
+# Basic cgsnapshot functionality test
+#
+# Copyright (c) 2020 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'
+CGNAME="004cgsnapshot"
+CGSNAPSHOT = """group 004cgsnapshot {
+                    memory {
+                            memory.use_hierarchy="1";
+                            memory.soft_limit_in_bytes="9223372036854771712";
+                            memory.force_empty="";
+                            memory.move_charge_at_immigrate="0";
+                            memory.kmem.tcp.max_usage_in_bytes="0";
+                            memory.max_usage_in_bytes="0";
+                            memory.oom_control="oom_kill_disable 0
+                                under_oom 0
+                                oom_kill 0"; 
+                            memory.limit_in_bytes="9223372036854771712";
+                            memory.swappiness="60";
+                            memory.kmem.failcnt="0";
+                            memory.kmem.max_usage_in_bytes="0";
+                            memory.failcnt="0";
+                            memory.kmem.tcp.failcnt="0";
+                            memory.kmem.limit_in_bytes="9223372036854771712";
+                            memory.use_hierarchy="1";
+                            memory.kmem.tcp.limit_in_bytes="9223372036854771712";
+                            memory.memsw.failcnt="0";
+                            memory.memsw.limit_in_bytes="9223372036854771712";
+                            memory.memsw.max_usage_in_bytes="0";
+                    }
+            }"""
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    if CgroupVersion.get_version('memory') != CgroupVersion.CGROUP_V1:
+        result = consts.TEST_SKIPPED
+        cause = "This test requires the cgroup v1 memory controller"
+
+    return result, cause
+
+def setup(config):
+    Cgroup.create(config, CONTROLLER, CGNAME)
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    expected = Cgroup.snapshot_to_dict(CGSNAPSHOT)
+    actual = Cgroup.snapshot(config, controller=CONTROLLER)
+
+    if expected[CGNAME] != actual[CGNAME]:
+        result = consts.TEST_FAILED
+        cause = "Expected cgsnapshot result did not equal actual cgsnapshot"
+
+    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))