Add python parsing library for network settings file.

Changes:
   - Implements network_settings.yaml file parsing in python.
   - Adds support for both IPv4 and IPv6 in network_settings.yaml
   - Adds support for api_network in network_settings.yaml
   - Removes bash library functions for network related functions.
   - Adds dependency to python34-yaml for apex-common package.

Note that support for ipv6 and api_network is not complete yet.
Proper configuriration of network environment and nic template
files will be added later.

Change-Id: I087f725dabedfef109c9de1f58ce2611da647e87
Signed-off-by: Feng Pan <fpan@redhat.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/lib/python/apex-python-utils.py b/lib/python/apex-python-utils.py
new file mode 100755
index 00000000..802e8571
--- /dev/null
+++ b/lib/python/apex-python-utils.py
@@ -0,0 +1,67 @@
+##############################################################################
+# Copyright (c) 2016 Feng Pan (fpan@redhat.com)
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+
+
+import argparse
+import sys
+import apex
+import logging
+import os
+
+def parse_net_settings(settings_args):
+    settings = apex.NetworkSettings(settings_args.path,
+                                    settings_args.network_isolation)
+    settings.dump_bash()
+
+
+def find_ip(int_args):
+    interface = apex.ip_utils.get_interface(int_args.interface,
+                                      int_args.address_family)
+    if interface:
+        print(interface.ip)
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--DEBUG', action='store_true', default=False,
+                    help="Turn on debug messages")
+subparsers = parser.add_subparsers()
+
+net_settings = subparsers.add_parser('parse_net_settings',
+                                     help='Parse network settings file')
+net_settings.add_argument('-n', '--path', default='network_settings.yaml',
+                          help='path to network settings file')
+net_settings.add_argument('-i', '--network_isolation', type=bool, default=True,
+                          help='network isolation')
+net_settings.set_defaults(func=parse_net_settings)
+
+get_int_ip = subparsers.add_parser('find_ip',
+                                   help='Find interface ip')
+get_int_ip.add_argument('-i', '--interface', required=True,
+                        help='Interface name')
+get_int_ip.add_argument('-af', '--address_family', default=4, type=int,
+                        choices=[4, 6],
+                        help='IP Address family')
+get_int_ip.set_defaults(func=find_ip)
+
+args = parser.parse_args(sys.argv[1:])
+if args.DEBUG:
+    logging.basicConfig(level=logging.DEBUG)
+else:
+    apex_log_filename = '/var/log/apex/apex.log'
+    os.makedirs(os.path.dirname(apex_log_filename), exist_ok=True)
+    logging.basicConfig(filename=apex_log_filename,
+                        format='%(asctime)s %(levelname)s: %(message)s',
+                        datefmt='%m/%d/%Y %I:%M:%S %p',
+                        level=logging.DEBUG)
+
+if hasattr(args, 'func'):
+    args.func(args)
+else:
+    parser.print_help()
+    exit(1)