Expose timezone configuration

This change adds an undercloud_timezone configuration that can be used
to configure the timezone when we install the undercloud.

Change-Id: I5dcf3250a181c3614189618b9bae62e466b00275
Related-Bug: #1784068

releasenotes/notes/undercloud-timezone-052a6c1c05e80850.yaml

@@ -0,0 +1,12 @@
+---
+features:
+  - |
+    Host timezone can be managed during the undercloud installation. The default
+    timezone is the timezone already configured for the system. The timezone
+    can be configured by setting undercloud_timezone in undercloud.conf
+upgrade:
+  - |
+    Host timezone can be managed during the undercloud upgrade. The default
+    timezone is the timezone already configured for the system. The timezone
+    can be configured by setting undercloud_timezone in undercloud.conf and it
+    is recommended to set this going forward.

tripleoclient/config/undercloud.py

@@ -130,6 +130,10 @@ class UndercloudConfig(StandaloneConfig):
                         default=['0.pool.ntp.org', '1.pool.ntp.org',
                                  '2.pool.ntp.org', '3.pool.ntp.org'],
                         help=_('List of ntp servers to use.')),
+            cfg.StrOpt('undercloud_timezone', default=None,
+                       help=_('Host timezone to be used. If no timezone is '
+                              'specified, the existing timezone configuration '
+                              'is used.')),
             cfg.StrOpt('overcloud_domain_name',
                        default='localdomain',
                        help=_(

tripleoclient/tests/config/test_config_undercloud.py

@@ -71,6 +71,7 @@ class TestUndercloudConfig(base.TestCase):
                     'undercloud_ntp_servers',
                     'undercloud_public_host',
                     'undercloud_service_certificate',
+                    'undercloud_timezone',
                     'undercloud_update_packages',
                     'upgrade_cleanup']
         self.assertEqual(expected, [x.name for x in ret])
@@ -133,6 +134,7 @@ class TestUndercloudConfig(base.TestCase):
                     'undercloud_ntp_servers',
                     'undercloud_public_host',
                     'undercloud_service_certificate',
+                    'undercloud_timezone',
                     'undercloud_update_packages',
                     'upgrade_cleanup']
         self.assertEqual(expected, [x.name for x in ret])

tripleoclient/v1/undercloud_config.py

@@ -32,6 +32,7 @@ from jinja2 import meta
 
 from osc_lib.i18n import _
 from oslo_config import cfg
+from time import strftime
 from tripleo_common.image import kolla_builder
 
 from tripleoclient.config.undercloud import load_global_config
@@ -383,6 +384,11 @@ def prepare_undercloud_deploy(upgrade=False, no_validations=False,
     if CONF.get('undercloud_ntp_servers', None):
         env_data['NtpServer'] = CONF['undercloud_ntp_servers']
 
+    if CONF.get('undercloud_timezone', None):
+        env_data['TimeZone'] = CONF['undercloud_timezone']
+    else:
+        env_data['TimeZone'] = strftime("%Z")
+
     if CONF.get('enable_validations', False):
         env_data['UndercloudConfigFilePath'] = constants.UNDERCLOUD_CONF_PATH
         if not no_validations: