Better error handling for login mgrs in server install/uninstall

The purpose is to catch it when either no modules are enabled or if
you try to set the login module order and one of them is not
available/installed, then fail gracefully.

There were some baked-in assumptions that all login providers
are installed. Add some error handling around trying to determine
what is available, and rather than trying to force pam to be enabled
just exit with a handy message.

Don't rely on lm_order during uninstall. Use the list of enabled
Login managers instead.

Bail out of argument checking if uninstall is requested.

https://fedorahosted.org/ipsilon/ticket/105

Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>

diff --git a/ipsilon/install/ipsilon-server-install b/ipsilon/install/ipsilon-server-install
index 5ab163b..502d4eb 100755 (executable)
--- a/ipsilon/install/ipsilon-server-install
+++ b/ipsilon/install/ipsilon-server-install
@@ -182,7 +182,10 @@ def install(plugins, args):
 
     logger.info('Configuring login managers')
     for plugin_name in args['lm_order']:
-        plugin = plugins['Login Managers'][plugin_name]
+        try:
+            plugin = plugins['Login Managers'][plugin_name]
+        except KeyError:
+            sys.exit('Login provider %s not installed' % plugin_name)
         if plugin.configure(args) == False:
             print 'Configuration of login manager %s failed' % plugin_name
 
@@ -235,7 +238,7 @@ def uninstall(plugins, args):
             print 'Removal of environment helper %s failed' % plugin_name
 
     logger.info('Removing login managers')
-    for plugin_name in args['lm_order']:
+    for plugin_name in plugins['Login Managers']:
         plugin = plugins['Login Managers'][plugin_name]
         if plugin.unconfigure(args) == False:
             print 'Removal of login manager %s failed' % plugin_name
@@ -351,6 +354,9 @@ def parse_args(plugins):
     if not args['hostname']:
         args['hostname'] = socket.getfqdn()
 
+    if args['uninstall']:
+        return args
+
     if len(args['hostname'].split('.')) < 2:
         raise ConfigurationError('Hostname: %s is not a FQDN')
 
@@ -373,12 +379,7 @@ def parse_args(plugins):
         args['lm_order'] = args['lm_order'].split(',')
 
     if len(args['lm_order']) == 0:
-        #force the basic pam provider if nothing else is selected
-        if 'pam' not in args:
-            parser.print_help()
-            sys.exit(-1)
-        args['lm_order'] = ['pam']
-        args['pam'] = 'yes'
+        sys.exit('No login plugins are enabled.')
 
     #FIXME: check instance is only alphanums