244 lines
9.0 KiB
Python
244 lines
9.0 KiB
Python
"""Handling configuration files."""
|
|
# Copyright (C) 2010 Sebastian Heinlein <sevel@glatzor.de>
|
|
#
|
|
# Licensed under the GNU General Public License Version 2
|
|
#
|
|
# This program 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 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# 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, write to the Free Software
|
|
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
|
|
__author__ = "Sebastian Heinlein <devel@glatzor.de>"
|
|
|
|
__all__ = ("ConfigWriter",)
|
|
|
|
import logging
|
|
import os
|
|
|
|
import apt_pkg
|
|
|
|
log = logging.getLogger("AptDaemon.ConfigWriter")
|
|
|
|
|
|
class Value(object):
|
|
|
|
"""Represents a value with position information.
|
|
|
|
.. attribute:: string
|
|
The value string.
|
|
|
|
.. attribute:: line
|
|
The line number of the configuration file in which the value is set.
|
|
|
|
.. attribute:: start
|
|
The position in the line at which the value starts.
|
|
|
|
.. attribute:: end
|
|
The position in the line at which the value ends.
|
|
|
|
.. attribute:: quotes
|
|
The outer qoutes of the value: ' or "
|
|
"""
|
|
|
|
def __init__(self, line, start, quotes):
|
|
self.string = ""
|
|
self.start = start
|
|
self.end = None
|
|
self.line = line
|
|
self.quotes = quotes
|
|
|
|
def __cmp__(self, other):
|
|
return self.string == other
|
|
|
|
def __repr__(self):
|
|
return "Value: '%s' (line %s: %s to %s)" % (self.string, self.line,
|
|
self.start, self.end)
|
|
|
|
|
|
class ConfigWriter(object):
|
|
|
|
"""Modifies apt configuration files."""
|
|
|
|
def parse(self, lines):
|
|
"""Parse an ISC based apt configuration.
|
|
|
|
:param lines: The list of lines of a configuration file.
|
|
|
|
:returns: Dictionary of key, values found in the parsed configuration.
|
|
"""
|
|
options = {}
|
|
in_comment = False
|
|
in_value = False
|
|
prev_char = None
|
|
option = []
|
|
value = None
|
|
option_name = ""
|
|
value_list = []
|
|
in_brackets = True
|
|
level = 0
|
|
for line_no, line in enumerate(lines):
|
|
for char_no, char in enumerate(line):
|
|
if not in_comment and char == "*" and prev_char == "/":
|
|
in_comment = True
|
|
prev_char = ""
|
|
continue
|
|
elif in_comment and char == "/" and prev_char == "*":
|
|
# A multiline comment was closed
|
|
in_comment = False
|
|
prev_char = ""
|
|
option_name = option_name[:-1]
|
|
continue
|
|
elif in_comment:
|
|
# We ignore the content of multiline comments
|
|
pass
|
|
elif not in_value and ((char == "/" and prev_char == "/") or
|
|
char == "#"):
|
|
# In the case of a line comment continue processing
|
|
# the next line
|
|
prev_char = ""
|
|
option_name = option_name[:-1]
|
|
break
|
|
elif char in "'\"":
|
|
if in_value and value.quotes == char:
|
|
value.end = char_no
|
|
in_value = not in_value
|
|
elif not value:
|
|
value = Value(line_no, char_no, char)
|
|
in_value = not in_value
|
|
else:
|
|
value.string += char
|
|
elif in_value:
|
|
value.string += char
|
|
elif option_name and char == ":" and prev_char == ":":
|
|
option.append(option_name[:-1])
|
|
option_name = ""
|
|
elif char.isalpha() or char in "/-:._+":
|
|
option_name += char.lower()
|
|
elif char == ";":
|
|
if in_brackets:
|
|
value_list.append(value)
|
|
value = None
|
|
continue
|
|
if value_list:
|
|
log.debug("Found %s \"%s\"", "::".join(option),
|
|
value_list)
|
|
options["::".join(option)] = value_list
|
|
value_list = []
|
|
elif value:
|
|
log.debug("Found %s \"%s\"", "::".join(option), value)
|
|
options["::".join(option)] = value
|
|
else:
|
|
log.debug("Skipping empty key %s", "::".join(option))
|
|
value = None
|
|
if level > 0:
|
|
option.pop()
|
|
else:
|
|
option = []
|
|
elif char == "}":
|
|
level -= 1
|
|
in_brackets = False
|
|
elif char == "{":
|
|
level += 1
|
|
if option_name:
|
|
option.append(option_name)
|
|
option_name = ""
|
|
in_brackets = True
|
|
elif char in "\t\n ":
|
|
if option_name:
|
|
option.append(option_name)
|
|
option_name = ""
|
|
in_brackets = False
|
|
else:
|
|
raise ValueError("Unknown char '%s' in line: '%s'" %
|
|
(char, line))
|
|
prev_char = char
|
|
return options
|
|
|
|
def set_value(self, option, value, defaultfile):
|
|
"""Change the value of an option in the configuration.
|
|
|
|
:param option: The name of the option, e.g.
|
|
'apt::periodic::AutoCleanInterval'.
|
|
:param value: The value of the option. Will be converted to string.
|
|
:param defaultfile: The filename of the ``/etc/apt/apt.conf.d``
|
|
configuration snippet in which the option should be set.
|
|
If the value is overriden by a later configuration file snippet
|
|
it will be disabled in the corresponding configuration file.
|
|
"""
|
|
# FIXME: Support value lists
|
|
# Convert the value to string
|
|
if value is True:
|
|
value = "true"
|
|
elif value is False:
|
|
value = "false"
|
|
else:
|
|
value = str(value)
|
|
# Check all configuration file snippets
|
|
etc_parts = os.path.join(apt_pkg.config.find_dir("Dir::Etc"),
|
|
apt_pkg.config.find_dir("Dir::Etc::Parts"))
|
|
for filename in os.listdir(etc_parts):
|
|
if filename < defaultfile:
|
|
continue
|
|
with open(os.path.join(etc_parts, filename)) as fd:
|
|
lines = fd.readlines()
|
|
config = self.parse(lines)
|
|
try:
|
|
val = config[option.lower()]
|
|
except KeyError:
|
|
if filename == defaultfile:
|
|
lines.append("%s '%s';\n" % (option, value))
|
|
else:
|
|
continue
|
|
else:
|
|
# Check if the value needs to be changed at all
|
|
if ((value == "true" and
|
|
val.string.lower() in ["yes", "with", "on",
|
|
"enable"]) or
|
|
(value == "false" and
|
|
val.string.lower() in ["no", "without", "off",
|
|
"disable"]) or
|
|
(str(value) == val.string)):
|
|
continue
|
|
if filename == defaultfile:
|
|
line = lines[val.line]
|
|
new_line = line[:val.start + 1]
|
|
new_line += value
|
|
new_line += line[val.end:]
|
|
lines[val.line] = new_line
|
|
else:
|
|
# Comment out existing values instead in non default
|
|
# configuration files
|
|
# FIXME Quite dangerous for brackets
|
|
lines[val.line] = "// %s" % lines[val.line]
|
|
with open(os.path.join(etc_parts, filename), "w") as fd:
|
|
log.debug("Writting %s", filename)
|
|
fd.writelines(lines)
|
|
if not os.path.exists(os.path.join(etc_parts, defaultfile)):
|
|
with open(os.path.join(etc_parts, defaultfile), "w") as fd:
|
|
log.debug("Writting %s", filename)
|
|
line = "%s '%s';\n" % (option, value)
|
|
fd.write(line)
|
|
|
|
|
|
def main():
|
|
apt_pkg.init_config()
|
|
cw = ConfigWriter()
|
|
for filename in sorted(os.listdir("/etc/apt/apt.conf.d/")):
|
|
lines = open("/etc/apt/apt.conf.d/%s" % filename).readlines()
|
|
cw.parse(lines)
|
|
print((cw.set_value("huhu::abc", "lumpi", "10glatzor")))
|
|
|
|
if __name__ == "__main__":
|
|
main()
|
|
|
|
# vim:ts=4:sw=4:et
|