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Text File  |  2008-10-10  |  6KB  |  169 lines
  1. # Copyright:
  2. #   Moshe Zadka (c) 2002
  3. #   Canonical Ltd. (c) 2005 (DebconfCommunicator)
  4. #
  5. # Redistribution and use in source and binary forms, with or without
  6. # modification, are permitted provided that the following conditions
  7. # are met:
  8. # 1. Redistributions of source code must retain the above copyright
  9. #    notice, this list of conditions and the following disclaimer.
  10. # 2. Redistributions in binary form must reproduce the above copyright
  11. #    notice, this list of conditions and the following disclaimer in the
  12. #    documentation and/or other materials provided with the distribution.
  13. # 
  14. # THIS SOFTWARE IS PROVIDED BY AUTHORS AND CONTRIBUTORS ``AS IS'' AND
  15. # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16. # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17. # ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
  18. # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19. # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20. # OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21. # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22. # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23. # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24. # SUCH DAMAGE.
  25.  
  26. import sys, os
  27. import errno
  28. import re
  29. import popen2
  30. import fcntl
  31.  
  32. class DebconfError(Exception):
  33.     pass
  34.  
  35. LOW, MEDIUM, HIGH, CRITICAL = 'low', 'medium', 'high', 'critical'
  36.  
  37. class Debconf:
  38.  
  39.     def __init__(self, title=None, read=None, write=None):
  40.         for command in ('capb set reset title input beginblock endblock go get'
  41.                         ' register unregister subst fset fget previous_module'
  42.                         ' visible purge metaget exist version settitle'
  43.                         ' info progress data').split():
  44.             self.setCommand(command)
  45.         self.read = read or sys.stdin
  46.         self.write = write or sys.stdout
  47.         sys.stdout = sys.stderr
  48.         self.setUp(title)
  49.  
  50.     def setUp(self, title):
  51.         self.version = self.version(2)
  52.         if self.version[:2] != '2.':
  53.             raise DebconfError(256, "wrong version: %s" % self.version)
  54.         self.capabilities = self.capb().split()
  55.         if title:
  56.             self.title(title)
  57.  
  58.     def setCommand(self, command):
  59.         setattr(self, command,
  60.                lambda *args, **kw: self.command(command, *args, **kw))
  61.  
  62.     def command(self, command, *params):
  63.         command = command.upper()
  64.         self.write.write("%s %s\n" % (command, ' '.join(map(str, params))))
  65.         self.write.flush()
  66.  
  67.         while True:
  68.             try:
  69.                 resp = self.read.readline().rstrip('\n')
  70.                 break
  71.             except IOError, e:
  72.                 if e.errno == errno.EINTR:
  73.                     continue
  74.                 else:
  75.                     raise
  76.  
  77.         if ' ' in resp:
  78.             status, data = resp.split(' ', 1)
  79.         else:
  80.             status, data = resp, ''
  81.         status = int(status)
  82.         if status == 0:
  83.             return data
  84.         elif status == 1:   # unescaped data
  85.             unescaped = ''
  86.             for chunk in re.split(r'(\\.)', data):
  87.                 if chunk.startswith('\\') and len(chunk) == 2:
  88.                     if chunk[1] == 'n':
  89.                         unescaped += '\n'
  90.                     else:
  91.                         unescaped += chunk[1]
  92.                 else:
  93.                     unescaped += chunk
  94.             return unescaped
  95.         else:
  96.             raise DebconfError(status, data)
  97.  
  98.     def stop(self):
  99.         self.write.write('STOP\n')
  100.         self.write.flush()
  101.  
  102.     def forceInput(self, priority, question):
  103.         try:
  104.             self.input(priority, question)
  105.             return 1
  106.         except DebconfError, e:
  107.             if e.args[0] != 30:
  108.                 raise
  109.         return 0
  110.  
  111.     def getBoolean(self, question):
  112.         result = self.get(question)
  113.         return result == 'true'
  114.  
  115.     def getString(self, question):
  116.         return self.get(question)
  117.  
  118.  
  119. class DebconfCommunicator(Debconf, object):
  120.     def __init__(self, owner, title=None, cloexec=False):
  121.         self.dccomm = popen2.Popen3(['debconf-communicate', '-fnoninteractive',
  122.                                      owner])
  123.         super(DebconfCommunicator, self).__init__(title=title,
  124.                                                   read=self.dccomm.fromchild,
  125.                                                   write=self.dccomm.tochild)
  126.         if cloexec:
  127.             fcntl.fcntl(self.read.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
  128.             fcntl.fcntl(self.write.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
  129.  
  130.     def shutdown(self):
  131.         if self.dccomm is not None:
  132.             self.dccomm.tochild.close()
  133.             self.dccomm.fromchild.close()
  134.             self.dccomm.wait()
  135.             self.dccomm = None
  136.  
  137.     # Don't rely on this; call .shutdown() explicitly.
  138.     def __del__(self):
  139.         try:
  140.             self.shutdown()
  141.         except AttributeError:
  142.             pass
  143.  
  144.  
  145. if ('DEBCONF_USE_CDEBCONF' in os.environ and
  146.     os.environ['DEBCONF_USE_CDEBCONF'] != ''):
  147.     _frontEndProgram = '/usr/lib/cdebconf/debconf'
  148. else:
  149.     _frontEndProgram = '/usr/share/debconf/frontend'
  150.  
  151. def runFrontEnd():
  152.     if not os.environ.has_key('DEBIAN_HAS_FRONTEND'):
  153.         os.environ['PERL_DL_NONLAZY']='1'
  154.         os.execv(_frontEndProgram, [_frontEndProgram, sys.executable]+sys.argv)
  155.  
  156.  
  157. if __name__ == '__main__':
  158.     runFrontEnd()
  159.     db = Debconf()
  160.     db.forceInput(CRITICAL, 'bsdmainutils/calendar_lib_is_not_empty')
  161.     db.go()
  162.     less = db.getBoolean('less/add_mime_handler')
  163.     aptlc = db.getString('apt-listchanges/email-address')
  164.     db.stop()
  165.     print db.version
  166.     print db.capabilities
  167.     print less
  168.     print aptlc
  169.