#!/usr/bin/env python """ Helper script for the Packages plugin, used if yum library support is enabled. The yum libs have horrific memory leaks, so apparently the right way to get around that in long-running processes it to have a short-lived helper. No, seriously -- check out the yum-updatesd code. It's pure madness. """ import os import sys import yum import logging from optparse import OptionParser from Bcfg2.Compat import json LOGGER = None def get_logger(verbose=0): """ set up logging according to the verbose level given on the command line """ global LOGGER if LOGGER is None: LOGGER = logging.getLogger(sys.argv[0]) stderr = logging.StreamHandler() if verbose: level = logging.DEBUG else: level = logging.WARNING LOGGER.setLevel(level) LOGGER.addHandler(stderr) syslog = logging.handlers.SysLogHandler("/dev/log") syslog.setFormatter(logging.Formatter("%(name)s: %(message)s")) LOGGER.addHandler(syslog) return LOGGER def pkg_to_tuple(package): """ json doesn't distinguish between tuples and lists, but yum does, so we convert a package in list format to one in tuple format """ if isinstance(package, list): return tuple(package) else: return package def pkgtup_to_string(package): if package[3] in ['auto', 'any']: return package[0] rv = [package[0], "-"] if package[2]: rv.extend([package[2], ':']) rv.extend([package[3], '-', package[4]]) if package[1]: rv.extend(['.', package[1]]) return ''.join(str(e) for e in rv) class DepSolver(object): def __init__(self, cfgfile, verbose=1): self.cfgfile = cfgfile self.yumbase = yum.YumBase() # pylint: disable=E1121 try: self.yumbase.preconf.debuglevel = verbose self.yumbase.preconf.fn = cfgfile self.yumbase._getConfig() except AttributeError: self.yumbase._getConfig(cfgfile, debuglevel=verbose) # pylint: enable=E1121 self.logger = get_logger(verbose) def get_groups(self): try: return self._groups except AttributeError: return ["noarch"] def set_groups(self, groups): self._groups = set(groups).union(["noarch"]) groups = property(get_groups, set_groups) def get_package_object(self, pkgtup, silent=False): try: matches = yum.packageSack.packagesNewestByName( self.yumbase.pkgSack.searchPkgTuple(pkgtup)) except yum.Errors.PackageSackError: if not silent: self.logger.warning("Package '%s' not found" % self.get_package_name(pkgtup)) matches = [] except yum.Errors.RepoError: err = sys.exc_info()[1] self.logger.error("Temporary failure loading metadata for %s: %s" % (self.get_package_name(pkgtup), err)) matches = [] pkgs = self._filter_arch(matches) if pkgs: return pkgs[0] else: return None def get_group(self, group, ptype="default"): if group.startswith("@"): group = group[1:] try: if self.yumbase.comps.has_group(group): group = self.yumbase.comps.return_group(group) else: self.logger.error("%s is not a valid group" % group) return [] except yum.Errors.GroupsError: err = sys.exc_info()[1] self.logger.warning(err) return [] if ptype == "default": return [p for p, d in list(group.default_packages.items()) if d] elif ptype == "mandatory": return [p for p, m in list(group.mandatory_packages.items()) if m] elif ptype == "optional" or ptype == "all": return group.packages else: self.logger.warning("Unknown group package type '%s'" % ptype) return [] def _filter_arch(self, packages): matching = [] for pkg in packages: if pkg.arch in self.groups: matching.append(pkg) else: self.logger.debug("%s has non-matching architecture (%s)" % (pkg, pkg.arch)) if matching: return matching else: # no packages match architecture; we'll assume that the # user knows what s/he is doing and this is a multiarch # box. return packages def get_package_name(self, package): """ get the name of a package or virtual package from the internal representation used by this Collection class """ if isinstance(package, tuple): if len(package) == 3: return yum.misc.prco_tuple_to_string(package) else: return pkgtup_to_string(package) else: return str(package) def complete(self, packagelist): packages = set() unknown = set() for pkg in packagelist: if isinstance(pkg, tuple): pkgtup = pkg else: pkgtup = (pkg, None, None, None, None) po = self.get_package_object(pkgtup) if not po: self.logger.debug("Unknown package %s" % self.get_package_name(pkg)) unknown.add(pkg) else: if self.yumbase.tsInfo.exists(pkgtup=po.pkgtup): self.logger.debug("%s added to transaction multiple times" % po) else: self.logger.debug("Adding %s to transaction" % po) self.yumbase.tsInfo.addInstall(po) self.yumbase.resolveDeps() for txmbr in self.yumbase.tsInfo: packages.add(txmbr.pkgtup) return list(packages), list(unknown) def clean_cache(self): for mdtype in ["Headers", "Packages", "Sqlite", "Metadata", "ExpireCache"]: # for reasons that are entirely obvious, all of the yum # API clean* methods return a tuple of 0 (zero, always # zero) and a list containing a single message about how # many files were deleted. so useful. thanks, yum. msg = getattr(self.yumbase, "clean%s" % mdtype)()[1][0] if not msg.startswith("0 "): self.logger.info(msg) def main(): parser = OptionParser() parser.add_option("-c", "--config", help="Config file") parser.add_option("-v", "--verbose", help="Verbosity level", action="count") (options, args) = parser.parse_args() logger = get_logger(options.verbose) try: cmd = args[0] except IndexError: logger.error("No command given") return 1 if not os.path.exists(options.config): logger.error("Config file %s not found" % options.config) return 1 depsolver = DepSolver(options.config, options.verbose) if cmd == "clean": depsolver.clean_cache() print(json.dumps(True)) elif cmd == "complete": data = json.loads(sys.stdin.read()) depsolver.groups = data['groups'] (packages, unknown) = depsolver.complete([pkg_to_tuple(p) for p in data['packages']]) print(json.dumps(dict(packages=list(packages), unknown=list(unknown)))) elif cmd == "get_groups": data = json.loads(sys.stdin.read()) rv = dict() for gdata in data: if "type" in gdata: packages = depsolver.get_group(gdata['group'], ptype=gdata['type']) else: packages = depsolver.get_group(gdata['group']) rv[gdata['group']] = list(packages) print(json.dumps(rv)) if __name__ == '__main__': sys.exit(main())