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# vim:set fileencoding=utf-8 et ts=4 sts=4 sw=4:
#
# apt-listchanges - Show changelog entries between the installed versions
# of a set of packages and the versions contained in
# corresponding .deb files
#
# Copyright (C) 2000-2006 Matt Zimmerman <mdz@debian.org>
# Copyright (C) 2006 Pierre Habouzit <madcoder@debian.org>
# Copyright (C) 2016 Robert Luberda <robert@debian.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
#
import re
import sys, os
import tempfile
import gzip
import errno
import glob
import shutil
import shlex
import signal
import subprocess
import apt_pkg
import ALCLog
from ALChacks import _
from functools import reduce
# TODO:
# indexed lookups by package at least, maybe by arbitrary field
def _numeric_urgency(u):
urgency_map = { 'critical' : 1,
'emergency' : 1,
'high' : 2,
'medium' : 3,
'low' : 4 }
return urgency_map.get(u.lower(), 0)
class ControlStanza:
source_version_re = re.compile('^\S+ \((?P<version>.*)\).*')
fields_to_read = [ 'Package', 'Source', 'Version', 'Architecture', 'Status' ]
def __init__(self, s):
field = None
for line in s.split('\n'):
if not line:
break
if line[0] in (' ', '\t'):
if field:
setattr(self, field, getattr(self, field) + '\n' + line)
else:
field, value = line.split(':', 1)
if field in self.fields_to_read:
setattr(self, field, value.lstrip())
else:
field = None
def source(self):
return getattr(self, 'Source', self.Package).split(' ')[0]
def installed(self):
return hasattr(self, 'Status') and self.Status.split(' ')[2] == 'installed'
def version(self):
"""
This function returns the version of the package. One would like it to
be the "binary" version, though we have the tough case of source
package whose binary packages versioning scheme is different from the
source one (see OOo, linux-source, ...).
This code does the following, if the Source field is set with a
specified version, then we use the binary version if and only if the
source version is a prefix. We must do that because of binNMUs.
"""
v = self.Version
if hasattr(self, 'Source'):
match = self.source_version_re.match(self.Source)
if match:
sv = match.group('version')
if not v.startswith(sv):
return sv
return v
class ControlParser:
def __init__(self):
self.stanzas = []
self.index = {}
def makeindex(self, field):
self.index[field] = {}
for stanza in self.stanzas:
self.index[field][getattr(stanza, field)] = stanza
def readfile(self, file):
try:
self.stanzas += [ControlStanza(x) for x in open(file, 'r', encoding='utf-8', errors='replace').read().split('\n\n') if x]
except Exception as ex:
raise RuntimeError(_("Error processing '%(what)s': %(errmsg)s") %
{'what': file, 'errmsg': str(ex)}) from ex
def readdeb(self, deb):
try:
command = ['dpkg-deb', '-f', deb] + ControlStanza.fields_to_read
output = subprocess.check_output(command)
self.stanzas.append(ControlStanza(output.decode('utf-8', 'replace')))
except Exception as ex:
raise RuntimeError(_("Error processing '%(what)s': %(errmsg)s") %
{'what': file, 'errmsg': str(ex)}) from ex
def find(self, field, value):
if field in self.index:
if value in self.index[field]:
return self.index[field][value]
else:
return None
else:
for stanza in self.stanzas:
if hasattr(stanza, field) and getattr(stanza, field) == value:
return stanza
return None
class ChangelogParser:
_changelog_header = re.compile('^\S+ \((?P<version>.*)\) .*;.*urgency=(?P<urgency>\w+).*')
_changelog_header_ancient = re.compile('^(\S+ \(?\d.*\)|Old Changelog:|Changes|ChangeLog begins|Mon|Tue|Wed|Thu|Fri|Sat|Sun).*')
_changelog_header_emacs = re.compile('(;;\s*)?Local\s+variables.*', re.IGNORECASE)
def __init__(self):
self._entry = ''
self._entries = []
def parse(self, fd, since_version):
'''Parse changelog or news from the given file descriptor.
If since_version is specified, only return entries later
than the specified version.'''
urgency = _numeric_urgency('low')
is_debian_changelog = False
ancient = False
for line in fd.readlines():
line = line.decode('utf-8', 'replace')
if line.startswith(' ') or line == '\n':
self._add_line(line)
elif line.startswith('#'):
continue
else:
match = self._changelog_header.match(line) if not ancient else None
if match:
if since_version and apt_pkg.version_compare(match.group('version'),
since_version) <= 0:
break
is_debian_changelog = True
urgency = min(_numeric_urgency(match.group('urgency')),
urgency)
self._save_entry(line)
elif self._changelog_header_ancient.match(line):
if not is_debian_changelog: # probably upstream changelog in GNU format
break
ancient = True
self._save_entry(line)
elif self._changelog_header_emacs.match(line):
break
elif is_debian_changelog:
self._add_line(line)
else:
break
if not is_debian_changelog:
return None, urgency
self._save_entry(None)
return self._entries, urgency
def _add_line(self, line):
self._entry += line
def _save_entry(self, new_entry_header):
self._entry = self._entry.strip()
if self._entry != '':
self._entries += [ self._entry + '\n' ]
self._entry = new_entry_header
class Package:
def __init__(self, path):
self.path = path
parser = ControlParser()
parser.readdeb(self.path)
pkgdata = parser.stanzas[0]
self.binary = pkgdata.Package
self.source = pkgdata.source()
self.Version = pkgdata.version()
self.arch = pkgdata.Architecture
def extract_changes(self, which, since_version=None, reverse=None):
'''Extract changelog entries, news or both from the package.
If since_version is specified, only return entries later than the specified version.
returns a sequence of Changes objects.'''
news_filenames = self._changelog_variations('NEWS.Debian')
changelog_filenames = self._changelog_variations('changelog.Debian')
changelog_filenames_binnmu = self._changelog_variations('changelog.Debian.' + self.arch)
changelog_filenames_native = self._changelog_variations('changelog')
filenames = []
if which == 'both' or which == 'news':
filenames.extend(news_filenames)
if which == 'both' or which == 'changelogs':
filenames.extend(changelog_filenames)
filenames.extend(changelog_filenames_binnmu)
filenames.extend(changelog_filenames_native)
tempdir = self._extract_contents(filenames)
find_first = lambda acc, fname: acc or self._read_changelog(os.path.join(tempdir, fname), since_version, reverse)
news = reduce(find_first, news_filenames, None)
changelog = reduce(find_first, changelog_filenames + changelog_filenames_native, None)
binnmu = reduce(find_first, changelog_filenames_binnmu, None)
shutil.rmtree(tempdir, 1)
return (news, changelog, binnmu)
def _extract_contents(self, filenames):
tempdir = tempfile.mkdtemp(prefix='apt-listchanges')
extract_command = 'dpkg-deb --fsys-tarfile %s | tar xf - --wildcards -C %s %s 2>/dev/null' % (
shlex.quote(self.path), shlex.quote(tempdir),
' '.join([shlex.quote(x) for x in filenames])
)
# tar exits unsuccessfully if _any_ of the files we wanted
# were not available, so we can't do much with its status
status = os.system(extract_command)
if os.WIFSIGNALED(status) and os.WTERMSIG(status) == signal.SIGINT:
shutil.rmtree(tempdir, 1)
raise KeyboardInterrupt
return tempdir
def _open_changelog_file(self, filename):
filenames = glob.glob(filename)
for filename in filenames:
try:
if os.path.isdir(filename):
ALCLog.error(_("Ignoring `%s' (seems to be a directory!)") % filename)
elif filename.endswith('.gz'):
return gzip.GzipFile(filename)
else:
return open(filename, 'rb')
break
except IOError as e:
if e.errno == errno.ENOENT:
pass
else:
raise
return None
def _read_changelog(self, filename, since_version, reverse=False):
fd = self._open_changelog_file(filename)
if not fd:
return None
entries, urgency = ChangelogParser().parse(fd, since_version)
if not urgency:
return None # not a Debian changelog file
if not entries:
# Valid Debian changelog, but all entries filtered out due
# to --since-version. Return empty string to prevent the caller
# from searching for another Debian changelog file.
return Changes(self.source, "", urgency)
if reverse:
entries.reverse()
changes = "\n".join(entries) + "\n"
return Changes(self.source, changes, urgency)
def _changelog_variations(self, filename):
formats = ['./usr/share/doc/*/%s.gz',
'./usr/share/doc/*/%s']
return [x % filename for x in formats]
class Changes:
def __init__(self, package, changes, urgency):
self.package = package
self.changes = changes
self.urgency = urgency
def merge_binnmu(self, other, reverse = False):
assert self.package == other.package
self.urgency = min(self.urgency, other.urgency)
# Assumption: binnmu has greater version than regular changelog
if reverse:
self.changes = self.changes + other.changes
else:
self.changes = other.changes + self.changes
__all__ = [ 'ControlParser', 'Package' ]