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# vim: set fileencoding=utf-8 :
#
# (C) 2011 Guido Günther <agx@sigxcpu.org>
# 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
"""A Debian Changelog"""
import email
import os
import subprocess
class NoChangeLogError(Exception):
"""No changelog found"""
pass
class ParseChangeLogError(Exception):
"""Problem parsing changelog"""
pass
class ChangeLog(object):
"""A Debian changelog"""
def __init__(self, contents=None, filename=None):
"""
Parse an existing changelog, Either contents, containing the contents
of a changelog file, or filename, pointing to a changelog file must be
passed.
"""
# Check that either contents or filename is passed (but not both)
if (not filename and not contents) or (filename and contents):
raise Exception("Either filename or contents must be passed")
# If a filename was passed, check if it exists
if filename and not os.access(filename, os.F_OK):
raise NoChangeLogError, "Changelog %s not found" % (filename, )
# If no filename was passed, let's read from stdin
if not filename:
filename = '-'
# Note that if contents is None, stdin will just be closed right
# away by communicate.
cmd = subprocess.Popen(['dpkg-parsechangelog', '-l%s' % filename],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
(output, errors) = cmd.communicate(contents)
if cmd.returncode:
raise ParseChangeLogError("Failed to parse changelog. "
"dpkg-parsechangelog said:\n%s" % (errors, ))
# Parse the result of dpkg-parsechangelog (which looks like
# email headers)
cp = email.message_from_string(output)
try:
if ':' in cp['Version']:
cp['Epoch'], cp['NoEpoch-Version'] = cp['Version'].split(':', 1)
else:
cp['NoEpoch-Version'] = cp['Version']
if '-' in cp['NoEpoch-Version']:
cp['Upstream-Version'], cp['Debian-Version'] = cp['NoEpoch-Version'].rsplit('-', 1)
else:
cp['Debian-Version'] = cp['NoEpoch-Version']
except TypeError:
raise ParseChangeLogError, output.split('\n')[0]
self._cp = cp
def __getitem__(self, item):
return self._cp[item]
def __setitem__(self, item, value):
self._cp[item] = value
@property
def name(self):
"""The packges name"""
return self._cp['Source']
@property
def version(self):
"""The full version string"""
return self._cp['Version']
@property
def upstream_version(self):
"""The upstream version"""
return self._cp['Upstream-Version']
@property
def debian_version(self):
"""The Debian part of the version number"""
return self._cp['Debian-Version']
@property
def epoch(self):
"""The package's epoch"""
return self._cp['Epoch']
@property
def noepoch(self):
"""The version string without the epoch"""
return self._cp['NoEpoch-Version']
def has_epoch(self):
"""
Whether the version has an epoch
@return: C{True} if the version has an epoch, C{False} otherwise
@rtype: C{bool}
"""
return self._cp.has_key('Epoch')
def is_native(self):
"""
Whether this is a native Debian package
"""
return not '-' in self.version
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