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igroups.py
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#! /usr/bin/python -tt # 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 Library 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. # # Copyright 2010, 2012 Red Hat # # James Antill <james@fedoraproject.org> import os import fnmatch import re def _open_no_umask(*args): """ Annoying people like to set umask's for root, which screws everything up for user readable stuff. """ oumask = os.umask(022) try: ret = open(*args) finally: os.umask(oumask) return ret def _makedirs_no_umask(*args): """ Annoying people like to set umask's for root, which screws everything up for user readable stuff. """ oumask = os.umask(022) try: ret = os.makedirs(*args) finally: os.umask(oumask) return ret def _read_str(fo): for s in fo: if s[:-1]: return s[:-1] return '' class InstalledGroup(object): def __init__(self, gid): self.gid = gid self.pkg_names = set() self.environment = None def __cmp__(self, other): if other is None: return 1 return cmp(self.gid, other.gid) def _additions(self, pkg_names): pkg_names = set(pkg_names) return sorted(pkg_names.difference(self.pkg_names)) def _removals(self, pkg_names): pkg_names = set(pkg_names) return sorted(pkg_names.difference(self.pkg_names)) groupid = property(fget=lambda self: self.gid, fset=lambda self, value: setattr(self, "gid", value), fdel=lambda self: setattr(self, "gid", None), doc="Compat. to treat comps groups/igroups the same") class InstalledEnvironment(object): def __init__(self, evgid): self.evgid = evgid self.grp_names = set() def __cmp__(self, other): if other is None: return 1 return cmp(self.evgid, other.evgid) def _additions(self, grp_names): grp_names = set(grp_names) return sorted(grp_names.difference(self.grp_names)) def _removals(self, grp_names): grp_names = set(grp_names) return sorted(grp_names.difference(self.grp_names)) environmentid = property(fget=lambda self: self.evgid, fset=lambda self, value: setattr(self, "evgid", value), fdel=lambda self: setattr(self, "evgid", None), doc="Compat. to treat comps groups/igroups the same") class InstalledGroups(object): def __init__(self, db_path): self.groups = {} self.changed = False self.environments = {} self._read_pkg_grps(db_path) self._read_grp_grps(db_path) def _read_pkg_grps(self, db_path): self.filename = db_path + "/installed" if not os.access(self.filename, os.R_OK): return fo = open(self.filename) try: ver = int(_read_str(fo)) except ValueError: return if ver != 1: return groups_num = int(_read_str(fo)) while groups_num > 0: groups_num -= 1 grp = InstalledGroup(_read_str(fo)) self.groups[grp.gid] = grp num = int(_read_str(fo)) while num > 0: num -= 1 grp.pkg_names.add(_read_str(fo)) def _read_grp_grps(self, db_path): self.grp_filename = db_path + "/environment" if not os.access(self.grp_filename, os.R_OK): return fo = open(self.grp_filename) try: ver = int(_read_str(fo)) except ValueError: return if ver != 1: return groups_num = int(_read_str(fo)) while groups_num > 0: groups_num -= 1 evgrp = InstalledEnvironment(_read_str(fo)) self.environments[evgrp.evgid] = evgrp num = int(_read_str(fo)) while num > 0: num -= 1 grpname = _read_str(fo) memb = _read_str(fo) evgrp.grp_names.add(grpname) assert memb in ('true', 'false') if memb == 'true': assert grpname in self.groups if grpname in self.groups: self.groups[grpname].environment = evgrp.evgid def close(self): pass def save(self, force=False): if not force and not self.changed: return False db_path = os.path.dirname(self.filename) if not os.path.exists(db_path): try: _makedirs_no_umask(db_path) except (IOError, OSError), e: # some sort of useful thing here? A warning? return False if not os.access(db_path, os.W_OK): return False self._write_pkg_grps() self._write_grp_grps() self.changed = False def _write_pkg_grps(self): fo = _open_no_umask(self.filename + '.tmp', 'w') fo.write("1\n") # version fo.write("%u\n" % len(self.groups)) for grp in sorted(self.groups.values()): fo.write("%s\n" % grp.gid) fo.write("%u\n" % len(grp.pkg_names)) for pkgname in sorted(grp.pkg_names): fo.write("%s\n" % pkgname) fo.close() os.rename(self.filename + '.tmp', self.filename) def _write_grp_grps(self): fo = _open_no_umask(self.grp_filename + '.tmp', 'w') fo.write("1\n") # version fo.write("%u\n" % len(self.environments)) for evgrp in sorted(self.environments.values()): fo.write("%s\n" % evgrp.evgid) fo.write("%u\n" % len(evgrp.grp_names)) for grpname in sorted(evgrp.grp_names): fo.write("%s\n" % grpname) if (grpname in self.groups and self.groups[grpname].environment == evgrp.evgid): fo.write("%s\n" % "true") else: fo.write("%s\n" % "false") fo.close() os.rename(self.grp_filename + '.tmp', self.grp_filename) def add_group(self, groupid, pkg_names, ievgrp=None): self.changed = True if groupid not in self.groups: self.groups[groupid] = InstalledGroup(groupid) grp = self.groups[groupid] for pkg_name in pkg_names: grp.pkg_names.add(pkg_name) if ievgrp is not None: grp.environment = ievgrp.evgid ievgrp.grp_names.add(groupid) return grp def del_group(self, groupid): self.changed = True if groupid in self.groups: del self.groups[groupid] def return_groups(self, group_pattern, case_sensitive=False): returns = {} if not group_pattern: return [] for item in group_pattern.split(','): item = item.strip() if item in self.groups: thisgroup = self.groups[item] returns[thisgroup.gid] = thisgroup continue if case_sensitive: match = re.compile(fnmatch.translate(item)).match else: match = re.compile(fnmatch.translate(item), flags=re.I).match done = False for group in self.groups.values(): if match(group.gid): done = True returns[group.gid] = group break return returns.values() def add_environment(self, evgroupid, grp_names): self.changed = True if evgroupid not in self.environments: self.environments[evgroupid] = InstalledEnvironment(evgroupid) grp = self.environments[evgroupid] for grp_name in grp_names: grp.grp_names.add(grp_name) return grp def del_environment(self, evgroupid): self.changed = True if evgroupid in self.environments: del self.environments[evgroupid] def return_environments(self, evgroup_pattern, case_sensitive=False): returns = {} if not evgroup_pattern: return [] for item in evgroup_pattern.split(','): item = item.strip() if item in self.environments: thisgroup = self.environments[item] returns[thisgroup.evgid] = thisgroup continue if case_sensitive: match = re.compile(fnmatch.translate(item)).match else: match = re.compile(fnmatch.translate(item), flags=re.I).match done = False for group in self.environments.values(): if match(group.evgid): done = True returns[group.evgid] = group break return returns.values()