Rhn register misc fixes (#20724)

* Remove monkeypatching of rhn config in rhn_register

rhn_register.Rhn() was doing some complicated monkeypatching of
the up2date_client.config.Config() class to add a default config
value. Since that was only used in one place, remove the monkeypatch
and handle the single default case.

That case was 'server_url' option, so replace it with a Rhn.server_url
property. Also handle the error case when no server url is provided.

* refactoring
* flatten some indention levels
* add 'enable_eus' to module doc
* set enable_eus var and use it directly
* style/pep8/etc cleanups
* some import cleanups

types was unused, os/re were from module_utils * import

* remove * import from module_utils.redhat
* remove * imports from module_utils.base
* remove unused Rhn._subscribe method
* cleanup pep8 style stuff
* remove a unused default mutable arg from Rhn.subscribe

Rhn.subscribe() only gets called in one place, and thats
with channels from module_params which default to [] and
are typed as a list.

lib/ansible/modules/packaging/os/rhn_register.py

@@ -83,6 +83,11 @@ options:
             - Optionally specify a list of comma-separated channels to subscribe to upon successful registration.
         required: false
         default: []
+    enable_eus:
+        description:
+            - If true, extended update support will be requested.
+        required: false
+        default: false
 '''
 
 EXAMPLES = '''
@@ -127,8 +132,8 @@ EXAMPLES = '''
     channels: rhel-x86_64-server-6-foo-1,rhel-x86_64-server-6-bar-1
 '''
 
+import os
 import sys
-import types
 import xmlrpclib
 import urlparse
 
@@ -142,14 +147,14 @@ except ImportError:
     HAS_UP2DATE_CLIENT = False
 
 # INSERT REDHAT SNIPPETS
-from ansible.module_utils.redhat import *
-# INSERT COMMON SNIPPETS
-from ansible.module_utils.basic import *
+from ansible.module_utils import redhat
+from ansible.module_utils.basic import AnsibleModule, get_exception
+
 
-class Rhn(RegistrationBase):
+class Rhn(redhat.RegistrationBase):
 
-    def __init__(self, username=None, password=None):
-        RegistrationBase.__init__(self, username, password)
+    def __init__(self, module=None, username=None, password=None):
+        redhat.RegistrationBase.__init__(self, module, username, password)
         self.config = self.load_config()
 
     def load_config(self):
@@ -159,23 +164,13 @@ class Rhn(RegistrationBase):
         if not HAS_UP2DATE_CLIENT:
             return None
 
-        self.config = up2date_client.config.initUp2dateConfig()
-
-        # Add support for specifying a default value w/o having to standup some
-        # configuration.  Yeah, I know this should be subclassed ... but, oh
-        # well
-        def get_option_default(self, key, default=''):
-            # the class in rhn-client-tools that this comes from didn't
-            # implement __contains__() until 2.5.x.  That's why we check if
-            # the key is present in the dictionary that is the actual storage
-            if key in self.dict:
-                return self[key]
-            else:
-                return default
+        config = up2date_client.config.initUp2dateConfig()
 
-        self.config.get_option = types.MethodType(get_option_default, self.config, up2date_client.config.Config)
+        return config
 
-        return self.config
+    @property
+    def server_url(self):
+        return self.config['serverURL']
 
     @property
     def hostname(self):
@@ -185,7 +180,7 @@ class Rhn(RegistrationBase):
 
             Returns: str
         '''
-        url = urlparse.urlparse(self.config['serverURL'])
+        url = urlparse.urlparse(self.server_url)
         return url[1].replace('xmlrpc.', '')
 
     @property
@@ -235,9 +230,9 @@ class Rhn(RegistrationBase):
         '''
         return os.path.isfile(self.config['systemIdPath'])
 
-    def configure(self, server_url):
+    def configure_server_url(self, server_url):
         '''
-            Configure system for registration
+            Configure server_url for registration
         '''
 
         self.config.set('serverURL', server_url)
@@ -249,7 +244,7 @@ class Rhn(RegistrationBase):
              * enabling the rhnplugin yum plugin
              * disabling the subscription-manager yum plugin
         '''
-        RegistrationBase.enable(self)
+        redhat.RegistrationBase.enable(self)
         self.update_plugin_conf('rhnplugin', True)
         self.update_plugin_conf('subscription-manager', False)
 
@@ -259,8 +254,8 @@ class Rhn(RegistrationBase):
             support will be requested.
         '''
         register_cmd = ['/usr/sbin/rhnreg_ks', '--username', self.username, '--password', self.password, '--force']
-        if self.module.params.get('server_url', None):
-            register_cmd.extend(['--serverUrl', self.module.params.get('server_url')])
+        if self.server_url:
+            register_cmd.extend(['--serverUrl', self.server_url])
         if enable_eus:
             register_cmd.append('--use-eus-channel')
         if activationkey is not None:
@@ -299,9 +294,7 @@ class Rhn(RegistrationBase):
         # Remove systemid file
         os.unlink(self.config['systemIdPath'])
 
-    def subscribe(self, channels=[]):
-        if len(channels) <= 0:
-            return
+    def subscribe(self, channels):
         if self._is_hosted():
             current_channels = self.api('channel.software.listSystemChannels', self.systemid)
             new_channels = [item['channel_label'] for item in current_channels]
@@ -328,20 +321,6 @@ class Rhn(RegistrationBase):
                 out_childs = self.api('system.setChildChannels', self.systemid, new_childs)
             return out_base and out_childs
 
-    def _subscribe(self, channels=[]):
-        '''
-            Subscribe to requested yum repositories using 'rhn-channel' command
-        '''
-        rhn_channel_cmd = "rhn-channel --user='%s' --password='%s'" % (self.username, self.password)
-        rc, stdout, stderr = self.module.run_command(rhn_channel_cmd + " --available-channels", check_rc=True)
-
-        # Enable requested repoid's
-        for wanted_channel in channels:
-            # Each inserted repo regexp will be matched. If no match, no success.
-            for available_channel in stdout.rstrip().split('\n'): # .rstrip() because of \n at the end -> empty string at the end
-                if re.search(wanted_repo, available_channel):
-                    rc, stdout, stderr = self.module.run_command(rhn_channel_cmd + " --add --channel=%s" % available_channel, check_rc=True)
-
     def _is_hosted(self):
         '''
             Return True if we are running against Hosted (rhn.redhat.com) or
@@ -352,10 +331,8 @@ class Rhn(RegistrationBase):
         else:
             return False
 
-def main():
 
-    # Read system RHN configuration
-    rhn = Rhn()
+def main():
 
     module = AnsibleModule(
         argument_spec=dict(
@@ -375,19 +352,26 @@ def main():
     if not HAS_UP2DATE_CLIENT:
         module.fail_json(msg="Unable to import up2date_client.  Is 'rhn-client-tools' installed?")
 
-    if not module.params['server_url']:
-        module.params['server_url'] = rhn.config.get_option('serverURL')
+    server_url = module.params['server_url']
+    username = module.params['username']
+    password = module.params['password']
 
     state = module.params['state']
-    rhn.username = module.params['username']
-    rhn.password = module.params['password']
-    rhn.configure(module.params['server_url'])
     activationkey = module.params['activationkey']
     profilename = module.params['profilename']
     sslcacert = module.params['sslcacert']
     systemorgid = module.params['systemorgid']
     channels = module.params['channels']
-    rhn.module = module
+    enable_eus = module.params['enable_eus']
+
+    rhn = Rhn(module=module, username=username, password=password)
+
+    # use the provided server url and persist it to the rhn config.
+    if server_url:
+        rhn.configure_server_url(server_url)
+
+    if not rhn.server_url:
+        module.fail_json(msg="No serverURL was found (from either the 'server_url' module arg or the config file option 'serverURL' in /etc/sysconfig/rhn/up2date)")
 
     # Ensure system is registered
     if state == 'present':
@@ -400,11 +384,11 @@ def main():
 
         # Register system
         if rhn.is_registered:
-            module.exit_json(changed=False, msg="System already registered.")
-        else:
+            return module.exit_json(changed=False, msg="System already registered.")
+
         try:
             rhn.enable()
-                rhn.register(module.params['enable_eus'] == True, activationkey, profilename, sslcacert, systemorgid)
+            rhn.register(enable_eus, activationkey, profilename, sslcacert, systemorgid)
             rhn.subscribe(channels)
         except Exception:
             e = get_exception()
@@ -415,8 +399,8 @@ def main():
     # Ensure system is *not* registered
     if state == 'absent':
         if not rhn.is_registered:
-            module.exit_json(changed=False, msg="System already unregistered.")
-        else:
+            return module.exit_json(changed=False, msg="System already unregistered.")
+
         try:
             rhn.unregister()
         except Exception: