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# Copyright (c) 2015 SUSE Linux GmbH. All rights reserved.
#
# This file is part of kiwi.
#
# kiwi is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# kiwi 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 kiwi. If not, see <http://www.gnu.org/licenses/>
#
import os
class SysConfig:
"""
**Read and Write sysconfig style files**
:param str source_file: source file path
"""
def __init__(self, source_file):
self.source_file = source_file
self.data_dict = {}
self.data_list = []
self._read()
def __setitem__(self, key, value):
if key not in self.data_dict:
self.data_list.append(key)
self.data_dict[key] = value
def __getitem__(self, key):
return self.data_dict[key]
def __contains__(self, key):
return key in self.data_dict
def get(self, key):
return self.data_dict.get(key)
def write(self):
"""
Write back source file with changed content but in same order
"""
with open(self.source_file, 'w') as source:
for line in self.data_list:
if line in self.data_dict:
key = line
value = self.data_dict[key]
source.write('{0}={1}'.format(key, value))
else:
source.write(line)
source.write(os.linesep)
def _read(self):
"""
Read file into a list and a key/value dictionary
Only lines which are not considered a comment and
containing the structure key=value are parsed into
the key/value dictionary. In order to keep the order
of lines a list is stored too. Those lines matching
the key/value format are stored with their key in
the list as a placeholder
"""
if os.path.exists(self.source_file):
with open(self.source_file) as source:
for line in source.readlines():
line = line.strip()
if '#' not in line and '=' in line:
elements = line.split('=')
key = elements.pop(0).strip()
value = '='.join(elements)
self.data_dict[key] = value
self.data_list.append(key)
else:
self.data_list.append(line)
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