--- a/bin/pvl.hosts-forward	Wed Feb 25 15:49:11 2015 +0200
+++ b/bin/pvl.hosts-forward	Wed Feb 25 15:55:23 2015 +0200
@@ -1,6 +1,40 @@
 #!/usr/bin/env python
 
+import logging; log = logging.getLogger('pvl.hosts-forward')
+import optparse 
+import pvl.args
+import pvl.hosts
 import pvl.hosts.zone
-import sys
 
-sys.exit(pvl.hosts.zone.forward_main())
+def main (argv):
+    """
+        Generate bind zonefiles from host definitions.
+    """
+
+    parser = optparse.OptionParser(main.__doc__)
+    parser.add_option_group(pvl.args.parser(parser))
+    parser.add_option_group(pvl.hosts.config.optparser(parser))
+
+    parser.add_option('--forward-zone',         metavar='DOMAIN',
+            help="Generate forward zone for domain")
+    
+    parser.add_option('--add-origin',           action='store_true',
+            help="Include $ORIGIN directive in zone")
+
+    # input
+    options, args = pvl.args.parse(parser, argv)
+    
+    if not options.forward_zone:
+        log.fatal("required --forward-zone")
+        return 1
+    
+    hosts = pvl.hosts.apply(options, args)
+
+    # process
+    for rr in pvl.hosts.zone.apply_hosts_forward(options, hosts, options.forward_zone):
+        print unicode(rr)
+    
+    return 0
+
+if __name__ == '__main__':
+    pvl.args.main(main)

--- a/bin/pvl.hosts-reverse	Wed Feb 25 15:49:11 2015 +0200
+++ b/bin/pvl.hosts-reverse	Wed Feb 25 15:55:23 2015 +0200
@@ -1,6 +1,42 @@
 #!/usr/bin/env python
 
+import logging; log = logging.getLogger('pvl.hosts-reverse')
+import optparse 
+import pvl.args
+import pvl.hosts
 import pvl.hosts.zone
-import sys
 
-sys.exit(pvl.hosts.zone.reverse_main())
+def main (argv):
+    """
+        Generate bind zonefiles from host definitions.
+    """
+
+    parser = optparse.OptionParser(main.__doc__)
+    parser.add_option_group(pvl.args.parser(parser))
+    parser.add_option_group(pvl.hosts.config.optparser(parser))
+
+    parser.add_option('--reverse-zone',         metavar='PREFIX',
+            help="Generate reverse zone for prefix")
+
+    parser.add_option('--unknown-host',         metavar='NAME',
+            help="Generate records for unused IPs")
+
+    # input
+    options, args = pvl.args.parse(parser, argv)
+
+    if not options.reverse_zone:
+        log.fatal("required --reverse-zone")
+        return 1
+
+    hosts = pvl.hosts.apply(options, args)
+
+    # process
+    prefix = pvl.dns.parse_prefix(options.reverse_zone)
+
+    for rr in pvl.hosts.zone.apply_hosts_reverse(options, hosts, prefix):
+        print unicode(rr)
+
+    return 0
+
+if __name__ == '__main__':
+    pvl.args.main(main)

--- a/pvl/hosts/zone.py	Wed Feb 25 15:49:11 2015 +0200
+++ b/pvl/hosts/zone.py	Wed Feb 25 15:55:23 2015 +0200
@@ -216,63 +216,3 @@
         else:
             continue
 
-import pvl.args
-import pvl.hosts.config
-
-import optparse 
-
-def forward_main () :
-    """
-        Generate bind zonefiles from host definitions.
-    """
-
-    parser = optparse.OptionParser(forward_main.__doc__)
-    parser.add_option_group(pvl.args.parser(parser))
-    parser.add_option_group(pvl.hosts.config.optparser(parser))
-
-    parser.add_option('--add-origin',           action='store_true',
-            help="Include $ORIGIN directive in zone")
-
-    parser.add_option('--forward-zone',         metavar='DOMAIN',
-            help="Generate forward zone for domain")
-
-    # input
-    options, args = parser.parse_args()
-    
-    pvl.args.apply(options)
-
-    hosts = pvl.hosts.apply(options, args)
-
-    # process
-    for rr in apply_hosts_forward(options, hosts, options.forward_zone):
-        print unicode(rr)
-    
-    return 0
-
-def reverse_main () :
-    """
-        Generate bind zonefiles from host definitions.
-    """
-
-    parser = optparse.OptionParser(reverse_main.__doc__)
-    parser.add_option_group(pvl.args.parser(parser))
-    parser.add_option_group(pvl.hosts.config.optparser(parser))
-
-    parser.add_option('--reverse-zone',         metavar='PREFIX',
-            help="Generate reverse zone for prefix")
-
-    parser.add_option('--unknown-host',         metavar='NAME',
-            help="Generate records for unused IPs")
-
-    # input
-    options, args = parser.parse_args()
-    
-    pvl.args.apply(options)
-
-    hosts = pvl.hosts.apply(options, args)
-
-    # process
-    for rr in apply_hosts_reverse(options, hosts, pvl.dns.parse_prefix(options.reverse_zone)):
-        print unicode(rr)
-
-    return 0