From f574332fc826da4f22b10187bbae29ec3213bb6d Mon Sep 17 00:00:00 2001
From: Barbora Smejkalová <bsmejkal@redhat.com>
Date: Jan 07 2019 11:09:32 +0000
Subject: Issue 49618 - Set nsslapd-cachememsize to custom value


Description:
Added function for getting available memory.
Added test case to set nsslapd-cachememsize to custom value above 3805132804 bytes. Test is skipped if available memory is lower than we want to set.

https://pagure.io/389-ds-base/issue/49618

Reviewed by: vashirov, spichugi (Thanks!)

---

diff --git a/dirsrvtests/tests/suites/config/regression_test.py b/dirsrvtests/tests/suites/config/regression_test.py
index 30824c9..a7a31b4 100644
--- a/dirsrvtests/tests/suites/config/regression_test.py
+++ b/dirsrvtests/tests/suites/config/regression_test.py
@@ -8,12 +8,69 @@
 #
 import logging
 import pytest
+from lib389.utils import *
 from lib389.dseldif import DSEldif
+from lib389.config import LDBMConfig
+from lib389.backend import Backends
 from lib389.topologies import topology_st as topo
 
 logging.getLogger(__name__).setLevel(logging.INFO)
 log = logging.getLogger(__name__)
 
+CUSTOM_MEM = '9100100100'
+
+
+# Function to return value of available memory in kb
+def get_available_memory():
+    with open('/proc/meminfo') as file:
+        for line in file:
+            if 'MemAvailable' in line:
+                free_mem_in_kb = line.split()[1]
+    return int(free_mem_in_kb)
+
+
+@pytest.mark.skipif(get_available_memory() < (int(CUSTOM_MEM)/1024), reason="available memory is too low")
+@pytest.mark.bz1627512
+@pytest.mark.ds49618
+def test_set_cachememsize_to_custom_value(topo):
+    """Test if value nsslapd-cachememsize remains set
+     at the custom setting of value above 3805132804 bytes
+     after changing the value to 9100100100 bytes
+
+    :id: 8a3efc00-65a9-4ee7-b8ee-e35840991ea9
+    :setup: Standalone Instance
+    :steps:
+        1. Disable in the cn=config,cn=ldbm database,cn=plugins,cn=config:
+           nsslapd-cache-autosize by setting it to 0
+        2. Disable in the cn=config,cn=ldbm database,cn=plugins,cn=config:
+           nsslapd-cache-autosize-split by setting it to 0
+        3. Restart the instance
+        4. Set in the cn=UserRoot,cn=ldbm database,cn=plugins,cn=config:
+           nsslapd-cachememsize: CUSTOM_MEM
+    :expectedresults:
+        1. nsslapd-cache-autosize is successfully disabled
+        2. nsslapd-cache-autosize-split is successfully disabled
+        3. The instance should be successfully restarted
+        4. nsslapd-cachememsize is successfully set
+    """
+
+    config_ldbm = LDBMConfig(topo.standalone)
+    backends = Backends(topo.standalone)
+    userroot_ldbm = backends.get("userroot")
+
+    log.info("Disabling nsslapd-cache-autosize by setting it to 0")
+    assert config_ldbm.set('nsslapd-cache-autosize', '0')
+
+    log.info("Disabling nsslapd-cache-autosize-split by setting it to 0")
+    assert config_ldbm.set('nsslapd-cache-autosize-split', '0')
+
+    log.info("Restarting instance")
+    topo.standalone.restart()
+    log.info("Instance restarted successfully")
+
+    log.info("Set nsslapd-cachememsize to value {}".format(CUSTOM_MEM))
+    assert userroot_ldbm.set('nsslapd-cachememsize', CUSTOM_MEM)
+
 
 def test_maxbersize_repl(topo):
     """Check that instance starts when nsslapd-errorlog-maxlogsize
@@ -52,3 +109,4 @@ def test_maxbersize_repl(topo):
     inst.start()
     log.info("Assert no init_dse_file errors in the error log")
     assert not inst.ds_error_log.match('.*ERR - init_dse_file.*')
+