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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
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())
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