ftests: Add a cgconfigparser test that loads a directory

Add a cgconfigparser test that loads its configuration files
from a specified directory.

-----------------------------------------------------------------
Test Results:
        Run Date:                          Mar 09 19:49:49
        Passed:                                  1 test(s)
        Skipped:                                 0 test(s)
        Failed:                                  0 test(s)
-----------------------------------------------------------------
Timing Results:
        Test                                    Time (sec)
        ---------------------------------------------------------
        setup                                        21.22
        018-cgconfig-load_dir.py                      0.94
        teardown                                      0.00
        ---------------------------------------------------------
        Total Run Time                               22.16

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

diff --git a/ftests/018-cgconfig-load_dir.py b/ftests/018-cgconfig-load_dir.py
new file mode 100755 (executable)
index 0000000..c97bad9
--- /dev/null
+++ b/ftests/018-cgconfig-load_dir.py
@@ -0,0 +1,151 @@
+#!/usr/bin/env python3
+#
+# cgconfigparser functionality test using a configuration directory
+#
+# 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
+
+CPU_CTRL = 'cpu'
+MEMORY_CTRL = 'memory'
+CGNAME = '018cgconfig'
+CFS_PERIOD = '400000'
+CFS_QUOTA = '50000'
+SHARES = '123'
+
+LIMIT_IN_BYTES = '409600'
+SOFT_LIMIT_IN_BYTES = '376832'
+
+CONFIG_FILE = '''group
+{} {{
+    {} {{
+        cpu.cfs_period_us = {};
+        cpu.cfs_quota_us = {};
+        cpu.shares = {};
+    }}
+    {} {{
+        memory.limit_in_bytes = {};
+        memory.soft_limit_in_bytes = {};
+    }}
+}}'''.format(CGNAME, CPU_CTRL, CFS_PERIOD, CFS_QUOTA, SHARES,
+             MEMORY_CTRL, LIMIT_IN_BYTES, SOFT_LIMIT_IN_BYTES)
+
+CONFIG_FILE_DIR = os.path.join(os.getcwd(), '018cgconfig')
+CONFIG_FILE_NAME = os.path.join(CONFIG_FILE_DIR, 'cgconfig.conf')
+
+def prereqs(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    if CgroupVersion.get_version('cpu') != CgroupVersion.CGROUP_V1:
+        result = consts.TEST_SKIPPED
+        cause = "This test requires the cgroup v1 cpu controller"
+        return result, cause
+
+    if CgroupVersion.get_version('memory') != CgroupVersion.CGROUP_V1:
+        result = consts.TEST_SKIPPED
+        cause = "This test requires the cgroup v1 memory controller"
+        return result, cause
+
+    return result, cause
+
+def setup(config):
+    os.mkdir(CONFIG_FILE_DIR)
+
+    f = open(CONFIG_FILE_NAME, 'w')
+    f.write(CONFIG_FILE)
+    f.close()
+
+def test(config):
+    result = consts.TEST_PASSED
+    cause = None
+
+    Cgroup.configparser(config, load_dir=CONFIG_FILE_DIR)
+
+    period = Cgroup.get(config, cgname=CGNAME, setting='cpu.cfs_period_us',
+                        print_headers=False, values_only=True)
+    if period != CFS_PERIOD:
+            result = consts.TEST_FAILED
+            cause = "cfs_period_us failed.  Expected {}, Received {}".format(
+                    CFS_PERIOD, period)
+            return result, cause
+
+    quota = Cgroup.get(config, cgname=CGNAME, setting='cpu.cfs_quota_us',
+                       print_headers=False, values_only=True)
+    if quota != CFS_QUOTA:
+            result = consts.TEST_FAILED
+            cause = "cfs_quota_us failed.  Expected {}, Received {}".format(
+                    CFS_QUOTA, quota)
+            return result, cause
+
+    shares = Cgroup.get(config, cgname=CGNAME, setting='cpu.shares',
+                        print_headers=False, values_only=True)
+    if shares != SHARES:
+            result = consts.TEST_FAILED
+            cause = "shares failed.  Expected {}, Received {}".format(
+                    SHARES, shares)
+            return result, cause
+
+    limit = Cgroup.get(config, cgname=CGNAME, setting='memory.limit_in_bytes',
+                       print_headers=False, values_only=True)
+    if limit != LIMIT_IN_BYTES:
+            result = consts.TEST_FAILED
+            cause = "limit_in_bytes failed.  Expected {}, Received {}".format(
+                    LIMIT_IN_BYTES, limit)
+            return result, cause
+
+    soft_limit = Cgroup.get(config, cgname=CGNAME,
+                            setting='memory.soft_limit_in_bytes',
+                            print_headers=False, values_only=True)
+    if soft_limit != SOFT_LIMIT_IN_BYTES:
+            result = consts.TEST_FAILED
+            cause = "soft_limit_in_bytes failed.  Expected {}, Received {}".format(
+                    SOFT_LIMIT_IN_BYTES, soft_limit)
+            return result, cause
+
+    return result, cause
+
+def teardown(config):
+    Cgroup.delete(config, CPU_CTRL, CGNAME)
+    Cgroup.delete(config, MEMORY_CTRL, CGNAME)
+    os.remove(CONFIG_FILE_NAME)
+    os.rmdir(CONFIG_FILE_DIR)
+
+def main(config):
+    [result, cause] = prereqs(config)
+    if result != consts.TEST_PASSED:
+        return [result, cause]
+
+    try:
+        setup(config)
+        [result, cause] = test(config)
+    finally:
+        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))