System config niceness!

1. Move out the old helpers that provided oop access/reading/writing
   to various standard conf files and place those in parsers instead.
2. Unify the 'update_hostname' which varied very little	between	distros
   and make it generic so that subclasses can only provide a couple of 
   functions to	obtain the hostname updating functionality
3. Implement that new set of functions in rhel/debian    
4. Use the new parsers chop_comment function for similar use 
   cases as well as add a new utils make header	function that
   can be used for configuration files that are	newly generated
   to use (less	duplication here of this same thing being done
   in multiple places.
5. Add in a distro '_apply_hostname' which calls out to	the 'hostname'
   program to set the system hostname (more duplication	elimination).
6. Make the 'constant' filenames being written to for configuration
   by the various distros be instance members instead of string
   constants 'sprinkled' throughout the code

1 files changed, 27 insertions, 0 deletions

diff --git a/cloudinit/distros/parsers/__init__.py b/cloudinit/distros/parsers/__init__.py
new file mode 100644
index 00000000..8334a5e6
--- /dev/null
+++ b/cloudinit/distros/parsers/__init__.py
@@ -0,0 +1,27 @@
+# vi: ts=4 expandtab
+#
+#    Copyright (C) 2012 Yahoo! Inc.
+#
+#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License version 3, as
+#    published by the Free Software Foundation.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+def chop_comment(text, comment_chars):
+    comment_locations = [text.find(c) for c in comment_chars]
+    comment_locations = [c for c in comment_locations if c != -1]
+    if not comment_locations:
+        return (text, '')
+    min_comment = min(comment_locations)
+    before_comment = text[0:min_comment]
+    comment = text[min_comment:]
+    return (before_comment, comment)