Implement apply for ifcfg implementation

Adds an apply function to the ifcfg implementation
which:

1) Shuts down existing interfaces w/ ifdown

2) writes new interfaces config files (routes too)

3) Starts up new interfaces w/ ifup

1 files changed, 30 insertions, 0 deletions

diff --git a/os_net_config/utils.py b/os_net_config/utils.py
new file mode 100644
index 0000000..41bc55e
--- /dev/null
+++ b/os_net_config/utils.py
@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+def write_config(filename, data):
+    with open(filename, "w") as f:
+        f.write(str(data))
+
+
+def get_file_data(filename):
+    try:
+        with open(filename, "r") as f:
+            return f.read()
+    except IOError:
+        return ""
+
+
+def diff(filename, data):
+    return not get_file_data(filename) == data