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ALCApt.py
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ALChacks.py
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AptListChangesGtk.py
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DebianFiles.py
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Code Editor : DebianFiles.py
# 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(), 99) 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: is_debian_changelog = True if since_version and apt_pkg.version_compare(match.group('version'), since_version) <= 0: break 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, None 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, reverse): '''Extract changelog and binnmu entries, news or both from the package. Unpacks changelog or news files from the binary package, and parses them. If since_version is specified, only return entries later than the specified version. Returns a tuple of sequences 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) try: 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) finally: shutil.rmtree(tempdir, 1) return (news, changelog, binnmu) def extract_changes_via_apt(self, since_version, reverse): '''Run apt-get changelog and parse the downloaded changelog. Retrieve changelog using the "apt-get changelog" command, and parse it. If since_version is specified, only return entries later than the specified version. Returns a single sequence of Changes objects or None on downloading or parsing failure.''' # Retrieve changelog file and save it in a temporary directory tempdir = tempfile.mkdtemp(prefix='apt-listchanges') changelog_file = os.path.join(tempdir, self.binary + '.changelog') changelog_fd = open(changelog_file, 'w') try: command = ['apt-get', '-qq', 'changelog', '%s=%s' % (self.binary, self.Version)] ALCLog.debug(_("Calling %(cmd)s to retrieve changelog") % {'cmd': str(command)}) subprocess.run(command, stdout=changelog_fd, stderr=subprocess.PIPE, timeout=120, check=True) except subprocess.CalledProcessError as ex: ALCLog.error(_('Unable to retrieve changelog for package %(pkg)s; ' + "'apt-get changelog' failed with: %(errmsg)s") % {'pkg': self.binary, 'errmsg': ex.stderr.decode('utf-8', 'replace') if ex.stderr else str(ex)}) except Exception as ex: ALCLog.error(_('Unable to retrieve changelog for package %(pkg)s; ' + "could not run 'apt-get changelog': %(errmsg)s") % {'pkg': self.binary, 'errmsg': str(ex)}) else: return self._read_changelog(changelog_file, since_version, reverse) finally: changelog_fd.close() shutil.rmtree(tempdir, 1) return None 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 and e.errno != errno.ELOOP: 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 urgency is None: 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' ]
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