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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 ChangeLogSection(object):
"""A section in the changelog describing one particular version"""
def __init__(self, package, version):
self._package = package
self._version = version
@property
def package(self):
return self._package
@property
def version(self):
return self._version
@classmethod
def parse(klass, section):
"""
Parse one changelog section
@param section: a changelog section
@type section: C{str}
@returns: the parse changelog section
@rtype: L{ChangeLogSection}
"""
header = section.split('\n')[0]
package = header.split()[0]
version = header.split()[1][1:-1]
return klass(package, version)
class ChangeLog(object):
"""A Debian changelog"""
def __init__(self, contents=None, filename=None):
"""
@param contents: the contents of the changelog
@type contents: C{str}
@param filename: the filename of the changelog
@param filename: C{str}
"""
self._contents = ''
self._cp = None
# 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 filename and not os.access(filename, os.F_OK):
raise NoChangeLogError, "Changelog %s not found" % (filename, )
if contents:
self._contents = contents[:]
else:
self._read()
self._parse()
def _parse(self):
"""Parse a changelog based on the already read contents."""
cmd = subprocess.Popen(['dpkg-parsechangelog', '-l-'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
(output, errors) = cmd.communicate(self._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 _read(self):
with file(self.filename) as f:
self._contents = f.read()
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
@property
def author(self):
"""
The author of the last modification
"""
return email.Utils.parseaddr(self._cp['Maintainer'])[0]
@property
def email(self):
"""
The author's email
"""
return email.Utils.parseaddr(self._cp['Maintainer'])[1]
@property
def date(self):
"""
The date of the last modification as rfc822 date
"""
return self._cp['Date']
@property
def sections_iter(self):
"""
Iterate over sections in the changelog
"""
section = ''
for line in self._contents.split('\n'):
if line and line[0] not in [ ' ', '\t' ]:
section += line
else:
if section:
yield ChangeLogSection.parse(section)
section = ''
@property
def sections(self):
"""
Get sections in the changelog
"""
return list(self.sections_iter)
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