From 70203faa181d96414acbbf6f0779c5d1344aea7c Mon Sep 17 00:00:00 2001
From: Andy Bavier <acb@cs.princeton.edu>
Date: Tue, 18 Sep 2012 15:29:54 -0400
Subject: [PATCH] Plugin for configuring network interfaces inside a container.

---
 plugins/interfaces.py | 83 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 plugins/interfaces.py

diff --git a/plugins/interfaces.py b/plugins/interfaces.py
new file mode 100644
index 0000000..51c7cf2
--- /dev/null
+++ b/plugins/interfaces.py
@@ -0,0 +1,83 @@
+"""
+Configure interfaces inside a container by pulling down files via URL.
+"""
+
+import logger
+import os
+import curlwrapper
+import xmlrpclib
+try:
+    from hashlib import sha1 as sha
+except ImportError:
+    from sha import sha
+import subprocess
+
+def checksum(path):
+    try:
+        f = open(path)
+        try: return sha(f.read()).digest()
+        finally: f.close()
+    except IOError: 
+        return None
+
+def start():
+    logger.log("interfaces: plugin starting up...")
+
+def GetSlivers(data, config=None, plc=None):
+
+    if 'slivers' not in data:
+        logger.log_missing_data("interfaces.GetSlivers",'slivers')
+        return
+
+    for sliver in data['slivers']:
+        slicename = sliver['name']
+        for tag in sliver['attributes']:
+            if tag['tagname'] == 'interface':
+                mydict = eval(tag['value'])
+                contents=""
+                # First look for filename/url combination for custom config files
+                if 'filename' in mydict and 'url' in mydict:
+                    dest = "/vservers/%s/%s" % (slicename, mydict['filename'])
+                    url = mydict['url']
+                    try:
+                        contents = curlwrapper.retrieve(url)
+                    except xmlrpclib.ProtocolError,e:
+                        logger.log('interfaces (%s): failed to retrieve %s' % (slicename, url))
+                        continue
+                else:
+                    # Otherwise generate /etc/sysconfig/network-scripts/ifcfg-<device>
+                    try:
+                        dest = "/vservers/%s/etc/sysconfig/network-scripts/ifcfg-%s" % (slicename, mydict['DEVICE'])
+                    except:
+                        logger.log('interfaces (%s): no DEVICE specified' % slicename)
+                        continue
+
+                    for key, value in mydict.items():
+                        if key in ['bridge']: 
+                            continue
+                        contents += '%s="%s"\n' % (key, value)
+
+                if sha(contents).digest() == checksum(dest):
+                    logger.log('interfaces (%s): no changes to %s' % (slicename, dest))
+                    continue
+
+                logger.log('interfaces (%s): installing file %s' % (slicename, dest))
+                try: 
+                    os.makedirs(os.path.dirname(dest))
+                except OSError: 
+                    pass
+
+                try:
+                    f = open (dest, "w")
+                    f.write(contents)
+                    f.close()
+                except:
+                    logger.log('interfaces (%s): error writing file %s' % (slicename, dest))
+                    continue
+
+                try:
+                    subprocess.check_call(['/usr/sbin/lxcsu', slicename, '/sbin/service', 
+                                           'network', 'restart'])
+                except:
+                    logger.log('interfaces (%s): error restarting network service' % slicename)
+                    
-- 
2.43.0