Filename: //usr/share/apt-listchanges//ALCSeenDb.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. # from dbm import ndbm from ALChacks import _ import os import shutil class DbError(Exception): pass class seendb_dummy(object): '''Interface for seen database. Also used when path to the database is not configured''' def __contains__(self, srcpackage): return False def __getitem__(self, srcpackage): pass def __setitem__(self, srcpackage, version): pass def close_db(self): pass def apply_changes(self): pass def dump(self): raise DbError(_("Path to the seen database is unknown.\n" "Please either specify it with --save-seen option\n" "or pass --profile=apt to have it read from the configuration file.")) class seendb(seendb_dummy): '''Class to manage the seen database''' def __init__(self, path, readOnly = False): super().__init__() self._extension = '.db' if path[-3:] != self._extension: raise DbError(_("Database %(db)s does not end with %(ext)s") % {'db': path, 'ext': self._extension}) self._dbpath = path[:-3] # strip the .db suffix try: mode = 'r' if readOnly else 'c' self._seen = ndbm.open(self._dbpath, mode, 0o644) 'foo%0' in self._seen except Exception as ex: raise DbError(_("Database %(db)s failed to load: %(errmsg)s") % {'db': path, 'errmsg': str(ex)}) from ex # Will replace seen after changes have actually been seen self._seen_new = {} def __contains__(self, srcpackage): return srcpackage in self._seen def __getitem__(self, srcpackage): return self._seen[srcpackage].decode() def __setitem__(self, srcpackage, version): if self._seen.get(srcpackage, b'').decode() != version: # Note: updating _seen_new, not _seen self._seen_new[srcpackage] = version def close_db(self): self._seen.close() self._seen = None def apply_changes(self): if not self._seen_new: # Nothing to update return def mk(arg): return self._dbpath + arg + self._extension old, cur, new = (mk('-old'), mk(''), mk('-new')) # For reliability and to have backup of the database, # it is updated in the following steps: # 1. copy current version to new if os.path.isfile(cur): shutil.copy(cur, new) # 2. apply the changes to new seen = ndbm.open(self._dbpath + '-new', 'c', 0o644) for (key, value) in self._seen_new.items(): seen[key] = value seen.close() # 3. save current as old, and rename new to current if os.path.isfile(old): os.unlink(old) if os.path.isfile(cur): os.link(cur, old) os.rename(new, cur) def dump(self): for key in sorted(self._seen.keys()): value = self._seen[key] print("%s %s" % (key.decode(), value.decode())) def make_seen_db(config, readOnly = False): if config.save_seen: return seendb(config.save_seen, readOnly) return seendb_dummy()

./Ninja\.