/usr/sbin/bcfg2-yum-helper is in bcfg2-server 1.3.3-1ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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""" 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 Bcfg2.Compat import wraps
from lockfile import FileLock, LockTimeout
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 YumHelper(object):
""" Yum helper base object """
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__)
class DepSolver(YumHelper):
""" Yum dependency solver. This is used for operations that only
read from the yum cache, and thus operates in cacheonly mode. """
def __init__(self, cfgfile, verbose=1):
YumHelper.__init__(self, cfgfile, verbose=verbose)
# internally, yum uses an integer, not a boolean, for conf.cache
self.yumbase.conf.cache = 1
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 acquire_lock(func):
""" decorator for CacheManager methods that gets and release a
lock while the method runs """
@wraps(func)
def inner(self, *args, **kwargs):
""" Get and release a lock while running the function this
wraps. """
self.logger.debug("Acquiring lock at %s" % self.lockfile)
while not self.lock.i_am_locking():
try:
self.lock.acquire(timeout=60) # wait up to 60 seconds
except LockTimeout:
self.lock.break_lock()
self.lock.acquire()
try:
func(self, *args, **kwargs)
finally:
self.lock.release()
self.logger.debug("Released lock at %s" % self.lockfile)
return inner
class CacheManager(YumHelper):
""" Yum cache manager. Unlike :class:`DepSolver`, this can write
to the yum cache, and so is used for operations that muck with the
cache. (Technically, :func:`CacheManager.clean_cache` could be in
either DepSolver or CacheManager, but for consistency I've put it
here.) """
def __init__(self, cfgfile, verbose=1):
YumHelper.__init__(self, cfgfile, verbose=verbose)
self.lockfile = \
os.path.join(os.path.dirname(self.yumbase.conf.config_file_path),
"lock")
self.lock = FileLock(self.lockfile)
@acquire_lock
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)
@acquire_lock
def populate_cache(self):
""" populate the yum cache """
for repo in self.yumbase.repos.findRepos('*'):
repo.metadata_expire = 0
repo.mdpolicy = "group:all"
self.yumbase.doRepoSetup()
self.yumbase.repos.doSetup()
for repo in self.yumbase.repos.listEnabled():
# this populates the cache as a side effect
repo.repoXML # pylint: disable=W0104
try:
repo.getGroups()
except yum.Errors.RepoMDError:
pass # this repo has no groups
self.yumbase.repos.populateSack(mdtype='metadata', cacheonly=1)
self.yumbase.repos.populateSack(mdtype='filelists', cacheonly=1)
self.yumbase.repos.populateSack(mdtype='otherdata', cacheonly=1)
# this does something with the groups cache as a side effect
self.yumbase.comps # pylint: disable=W0104
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
# pylint: disable=W0702
rv = 0
if cmd == "clean":
cachemgr = CacheManager(options.config, options.verbose)
try:
cachemgr.clean_cache()
print(json.dumps(True))
except:
logger.error("Unexpected error cleaning cache: %s" %
sys.exc_info()[1], exc_info=1)
print(json.dumps(False))
rv = 2
elif cmd == "makecache":
cachemgr = CacheManager(options.config, options.verbose)
try:
# this code copied from yumcommands.py
cachemgr.populate_cache()
print(json.dumps(True))
except yum.Errors.YumBaseError:
logger.error("Unexpected error creating cache: %s" %
sys.exc_info()[1], exc_info=1)
print(json.dumps(False))
elif cmd == "complete":
depsolver = DepSolver(options.config, options.verbose)
try:
data = json.loads(sys.stdin.read())
except:
logger.error("Unexpected error decoding JSON input: %s" %
sys.exc_info()[1])
rv = 2
try:
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))))
except:
logger.error("Unexpected error completing package set: %s" %
sys.exc_info()[1], exc_info=1)
print(json.dumps(dict(packages=[], unknown=data['packages'])))
rv = 2
elif cmd == "get_groups":
depsolver = DepSolver(options.config, options.verbose)
try:
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))
except:
logger.error("Unexpected error getting groups: %s" %
sys.exc_info()[1], exc_info=1)
print(json.dumps(dict()))
rv = 2
else:
logger.error("Unknown command %s" % cmd)
print(json.dumps(None))
rv = 2
return rv
if __name__ == '__main__':
sys.exit(main())
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