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# 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/>.
from StringIO import StringIO
import re
# This library is used to parse/write
# out the various sysconfig files edited
#
# It has to be slightly modified though
# to ensure that all values are quoted/unquoted correctly
# since these configs are usually sourced into
# bash scripts...
import configobj
class SysConf(configobj.ConfigObj):
def __init__(self, contents):
configobj.ConfigObj.__init__(self, contents,
interpolation=False,
write_empty_values=True)
def __str__(self):
contents = self.write()
out_contents = StringIO()
if isinstance(contents, (list, tuple)):
out_contents.write("\n".join(contents))
else:
out_contents.write(str(contents))
return out_contents.getvalue()
def _quote(self, value, multiline=False):
if not isinstance(value, (str, basestring)):
raise ValueError('Value "%s" is not a string' % (value))
if len(value) == 0:
return ''
if re.search(r"[\n\r]", value):
raise ValueError('Value "%s" cannot be safely quoted.' % (value))
quot = "%s"
if '#' in value:
quot = self._get_single_quote(value)
elif value[0] in ['"', "'"] and value[-1] in ['"', "'"]:
# Already quoted, leave it be
pass
elif "'" in value and '"' in value:
quot = self._get_triple_quote(value)
else:
# Quote whitespace if it isn't the start+end of a shell command
white_space_ok = False
if value.strip().startswith("$(") and value.strip().endswith(")"):
white_space_ok = True
if re.search(r"[\t ]", value) and not white_space_ok:
quot = self._get_single_quote(value)
return quot % (value)
def _write_line(self, indent_string, entry, this_entry, comment):
# Ensure it is formatted fine for
# how these sysconfig scripts are used
if this_entry.startswith("'") or this_entry.startswith('"'):
val = this_entry
val = self._decode_element(self._quote(this_entry))
key = self._decode_element(self._quote(entry))
cmnt = self._decode_element(comment)
return '%s%s%s%s%s' % (indent_string,
key,
self._a_to_u('='),
val,
cmnt)
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