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#!/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
import Bcfg2.Logger
from optparse import OptionParser
try:
import json
except ImportError:
import simplejson as json
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):
""" given a package tuple, return a human-readable string
describing the 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):
""" Yum dependency solver """
def __init__(self, cfgfile, verbose=1):
self.cfgfile = cfgfile
self.yumbase = yum.YumBase()
# pylint: disable=E1121,W0212
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,W0212
self.logger = logging.getLogger(self.__class__.__name__)
self._groups = None
def get_groups(self):
""" getter for the groups property """
if self._groups is not None:
return self._groups
else:
return ["noarch"]
def set_groups(self, groups):
""" setter for the groups property """
self._groups = set(groups).union(["noarch"])
groups = property(get_groups, set_groups)
def get_package_object(self, pkgtup, silent=False):
""" given a package tuple, get a yum package object """
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"):
""" Resolve a package group name into a list of packages """
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):
""" filter packages in the given list that do not have an
architecture in the list of groups for this client """
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):
""" resolve dependencies and generate a complete package list
from the given list of initial packages """
packages = set()
unknown = set()
for pkg in packagelist:
if isinstance(pkg, tuple):
pkgtup = pkg
else:
pkgtup = (pkg, None, None, None, None)
pkgobj = self.get_package_object(pkgtup)
if not pkgobj:
self.logger.debug("Unknown package %s" %
self.get_package_name(pkg))
unknown.add(pkg)
else:
if self.yumbase.tsInfo.exists(pkgtup=pkgobj.pkgtup):
self.logger.debug("%s added to transaction multiple times"
% pkgobj)
else:
self.logger.debug("Adding %s to transaction" % pkgobj)
self.yumbase.tsInfo.addInstall(pkgobj)
self.yumbase.resolveDeps()
for txmbr in self.yumbase.tsInfo:
packages.add(txmbr.pkgtup)
return list(packages), list(unknown)
def clean_cache(self):
""" clean the yum cache """
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()
if options.verbose:
level = logging.DEBUG
clevel = logging.DEBUG
else:
level = logging.WARNING
clevel = logging.INFO
Bcfg2.Logger.setup_logging('bcfg2-yum-helper', to_syslog=True,
to_console=clevel, level=level)
logger = logging.getLogger('bcfg2-yum-helper')
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())
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