/usr/lib/python3/dist-packages/debconf.py is in debconf 1.5.42ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | # Copyright:
# Moshe Zadka (c) 2002
# Canonical Ltd. (c) 2005 (DebconfCommunicator)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY AUTHORS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
import sys, os
import errno
import re
import subprocess
import fcntl
class DebconfError(Exception):
pass
LOW, MEDIUM, HIGH, CRITICAL = 'low', 'medium', 'high', 'critical'
class Debconf:
def __init__(self, title=None, read=None, write=None):
for command in ('capb set reset title input beginblock endblock go get'
' register unregister subst fset fget previous_module'
' visible purge metaget exist version settitle'
' info progress data').split():
self.setCommand(command)
self.read = read or sys.stdin
self.write = write or sys.stdout
sys.stdout = sys.stderr
self.setUp(title)
def setUp(self, title):
self.version = self.version(2)
if self.version[:2] != '2.':
raise DebconfError(256, "wrong version: %s" % self.version)
self.capabilities = self.capb().split()
if title:
self.title(title)
def setCommand(self, command):
setattr(self, command,
lambda *args, **kw: self.command(command, *args, **kw))
def command(self, command, *params):
command = command.upper()
self.write.write(("%s %s\n" % (command, ' '.join(map(str, params)))).encode())
self.write.flush()
while True:
try:
resp = self.read.readline().decode().rstrip('\n')
break
except IOError as e:
if e.errno == errno.EINTR:
continue
else:
raise
if ' ' in resp:
status, data = resp.split(' ', 1)
else:
status, data = resp, ''
status = int(status)
if status == 0:
return data
elif status == 1: # unescaped data
unescaped = ''
for chunk in re.split(r'(\\.)', data):
if chunk.startswith('\\') and len(chunk) == 2:
if chunk[1] == 'n':
unescaped += '\n'
else:
unescaped += chunk[1]
else:
unescaped += chunk
return unescaped
else:
raise DebconfError(status, data)
def stop(self):
self.write.write(b'STOP\n')
self.write.flush()
def forceInput(self, priority, question):
try:
self.input(priority, question)
return 1
except DebconfError as e:
if e.args[0] != 30:
raise
return 0
def getBoolean(self, question):
result = self.get(question)
return result == 'true'
def getString(self, question):
return self.get(question)
class DebconfCommunicator(Debconf, object):
def __init__(self, owner, title=None, cloexec=False):
args = ['debconf-communicate', '-fnoninteractive', owner]
self.dccomm = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, close_fds=True)
super(DebconfCommunicator, self).__init__(title=title,
read=self.dccomm.stdout,
write=self.dccomm.stdin)
if cloexec:
fcntl.fcntl(self.read.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
fcntl.fcntl(self.write.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
def shutdown(self):
if self.dccomm is not None:
self.dccomm.stdin.close()
self.dccomm.stdout.close()
self.dccomm.wait()
self.dccomm = None
# Don't rely on this; call .shutdown() explicitly.
def __del__(self):
try:
self.shutdown()
except AttributeError:
pass
if ('DEBCONF_USE_CDEBCONF' in os.environ and
os.environ['DEBCONF_USE_CDEBCONF'] != ''):
_frontEndProgram = '/usr/lib/cdebconf/debconf'
else:
_frontEndProgram = '/usr/share/debconf/frontend'
def runFrontEnd():
if 'DEBIAN_HAS_FRONTEND' not in os.environ:
os.environ['PERL_DL_NONLAZY']='1'
os.execv(_frontEndProgram, [_frontEndProgram, sys.executable]+sys.argv)
if __name__ == '__main__':
runFrontEnd()
db = Debconf()
db.forceInput(CRITICAL, 'bsdmainutils/calendar_lib_is_not_empty')
db.go()
less = db.getBoolean('less/add_mime_handler')
aptlc = db.getString('apt-listchanges/email-address')
db.stop()
print(db.version)
print(db.capabilities)
print(less)
print(aptlc)
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