Clean up logging and documentation in ec2 interfaces script

(imported from commit e55247931cdeb61563f2348ca09f3d7b9fc85f0c)

puppet/zulip_internal/files/zulip-ec2-configure-interfaces

@@ -1,5 +1,28 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
+#
+# Copyright © 2013 Zulip, Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+# Original author: Luke Faraone
+
 '''Configure a host for EC2-VPC dynamically assigned network interfaces
 
 Amazon VPC gives us a good deal of flexibility compared to classic EC2.
@@ -40,12 +63,12 @@ def guess_gateway(device_id):
     address[3] = '1'
     return '.'.join(address)
 
-log = logging.getLogger('ec2ify')
+log = logging.getLogger('configure-cloud-interfaces')
 log.setLevel(logging.DEBUG)
 
 log.addHandler(logging.handlers.SysLogHandler(facility=logging.handlers.SysLogHandler.LOG_DAEMON))
 log.addHandler(logging.StreamHandler())
-log.info("ec2ify starting")
+log.info("Starting.")
 
 macs = boto.utils.get_instance_metadata()["network"]["interfaces"]["macs"]
 ids = [int(macdata['device-number']) for macdata in macs.values()]
@@ -84,6 +107,7 @@ for device in macs.values():
                 ['/sbin/iptables', '-t', 'mangle', '-A', 'OUTPUT', '-m', 'conntrack', '--ctorigdst',
                     address_of(device_number), '-j', 'MARK', '--set-mark', str(device_number)])
 
+
     to_configure.remove(address_of(device_number))
 
     for (count, ip) in enumerate(to_configure):
@@ -99,3 +123,5 @@ for device in macs.values():
         # Don't freak out if this doens't work.
         subprocess.call(
             ['/sbin/ip', 'route', 'del', '10.0.0.0/8'])
+
+log.info("Finished.")