Stop and disable conflicting time&date services

Fedora 16 introduced chrony as default client time&date synchronization
service:
http://fedoraproject.org/wiki/Features/ChronyDefaultNTP
Thus, there may be people already using chrony as their time and date
synchronization service before installing IPA.

However, installing IPA server or client on such machine may lead to
unexpected behavior, as the IPA installer would configure ntpd and leave
the machine with both ntpd and chronyd enabled. However, since the OS
does not allow both chronyd and ntpd to be running concurrently and chronyd
has the precedence, ntpd would not be run on that system at all.

Make sure, that user is warned when trying to install IPA on such
system and is given a possibility to either not to let IPA configure
ntpd at all or to let the installer stop and disable chronyd.

https://fedorahosted.org/freeipa/ticket/2974

ipapython/platform/base.py

@@ -27,7 +27,11 @@ import os
 wellknownservices = ['certmonger', 'dirsrv', 'httpd', 'ipa', 'krb5kdc',
                      'messagebus', 'nslcd', 'nscd', 'ntpd', 'portmap',
                      'rpcbind', 'kadmin', 'sshd', 'autofs', 'rpcgssd',
-                     'rpcidmapd', 'pki_tomcatd', 'pki-cad']
+                     'rpcidmapd', 'pki_tomcatd', 'pki-cad', 'chronyd']
+
+# System may support more time&date services. FreeIPA supports ntpd only, other
+# services will be disabled during IPA installation
+timedate_services = ['ntpd', 'chronyd']
 
 
 # The common ports for these services. This is used to wait for the

ipapython/platform/fedora16.py

@@ -44,7 +44,10 @@ from ipalib import api
 #                         and restorecon is installed.
 __all__ = ['authconfig', 'service', 'knownservices',
     'backup_and_replace_hostname', 'restore_context', 'check_selinux_status',
-    'restore_network_configuration']
+    'restore_network_configuration', 'timedate_services']
+
+# Just copy a referential list of timedate services
+timedate_services = list(base.timedate_services)
 
 # For beginning just remap names to add .service
 # As more services will migrate to systemd, unit names will deviate and

ipapython/platform/fedora18.py

@@ -23,7 +23,7 @@ import socket
 import os
 
 from ipapython import ipautil
-from ipapython.platform import fedora16
+from ipapython.platform import fedora16, base
 
 # All what we allow exporting directly from this module
 # Everything else is made available through these symbols when they are
@@ -44,7 +44,10 @@ from ipapython.platform import fedora16
 #                         and restorecon is installed.
 __all__ = ['authconfig', 'service', 'knownservices',
     'backup_and_replace_hostname', 'restore_context', 'check_selinux_status',
-    'restore_network_configuration']
+    'restore_network_configuration', 'timedate_services']
+
+# Just copy a referential list of timedate services
+timedate_services = list(base.timedate_services)
 
 def backup_and_replace_hostname(fstore, statestore, hostname):
     old_hostname = socket.gethostname()

ipapython/platform/redhat.py

@@ -52,7 +52,10 @@ from ipalib import api
 #                         and restorecon is installed.
 __all__ = ['authconfig', 'service', 'knownservices',
     'backup_and_replace_hostname', 'restore_context', 'check_selinux_status',
-    'restore_network_configuration']
+    'restore_network_configuration', 'timedate_services']
+
+# Just copy a referential list of timedate services
+timedate_services = list(base.timedate_services)
 
 class RedHatService(base.PlatformService):
     def __wait_for_open_ports(self, instance_name=""):