1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
|
"""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
|