Source code for Bcfg2.Server.Plugins.Packages.Yum

""" Yum backend for :mod:`Bcfg2.Server.Plugins.Packages`.  This module
is the most complex backend because it has to handle Yum sources
without yum Python libraries, with yum Python libraries, and Pulp
sources.  (See :ref:`native-yum-libraries` for details on using the
yum Python libraries and :ref:`pulp-source-support` for details on
Pulp sources.)

.. _bcfg2-yum-helper:


If using the yum Python libraries, :class:`YumCollection` makes shell
calls to an external command, ``bcfg2-yum-helper``, which performs the
actual yum API calls.  This is done because the yum libs have horrific
memory leaks, and apparently the right way to get around that in
long-running processes it to have a short-lived helper.  This is how
it's done by yum itself in ``yum-updatesd``, which is a long-running
daemon that checks for and applies updates.

.. _yum-pkg-objects:

Package Objects

:class:`Bcfg2.Server.Plugins.Packages.Collection.Collection` objects
have the option to translate from some backend-specific representation
of packages to XML entries; see :ref:`pkg-objects` for more
information on this.  If you are using the Python yum libraries,
:class:`Bcfg2.Server.Plugins.Packages.Yum.YumCollection` opts to do
this, using the yum tuple representation of packages, which is::

    (<name>, <arch>, <epoch>, <version>, <release>)

For shorthand this is occasionally abbrevated "naevr".  Any datum that
is not defined is ``None``.  So a normal package entry that can be any
version would be passed to :ref:`bcfg2-yum-helper` as::

    ("somepackage", None, None, None, None)

A package returned from the helper might look more like this::

    ("somepackage", "x86_64", None, "1.2.3", "1.el6")

We translate between this representation and the XML representation of
packages with :func:`YumCollection.packages_from_entry` and

The Yum Backend

import os
import re
import sys
import time
import copy
import errno
import socket
import logging
import lxml.etree
import Bcfg2.Server.Plugin
from lockfile import FileLock
from Bcfg2.Utils import Executor
# pylint: disable=W0622
from Bcfg2.Compat import StringIO, cPickle, HTTPError, URLError, \
    ConfigParser, any
# pylint: enable=W0622
from Bcfg2.Server.Plugins.Packages.Collection import Collection
from Bcfg2.Server.Plugins.Packages.Source import SourceInitError, Source, \

LOGGER = logging.getLogger(__name__)

# pylint: disable=E0611
    from pulp.client.consumer.config import ConsumerConfig
    from pulp.client.api.repository import RepositoryAPI
    from pulp.client.api.consumer import ConsumerAPI
    from pulp.client.api import server
    HAS_PULP = True
except ImportError:
    HAS_PULP = False
# pylint: enable=E0611

    import yum
        import json
        # py2.4 json library is structured differently
        json.loads  # pylint: disable=W0104
    except (ImportError, AttributeError):
        import simplejson as json
    HAS_YUM = True
except ImportError:
    HAS_YUM = False"Packages: No yum libraries found; forcing use of internal "
                "dependency resolver")

XP = '{}'
RP = '{}'
RPO = '{}'
FL = '{}'


def _setup_pulp(setup):
    """ Connect to a Pulp server and pass authentication credentials.
    This only needs to be called once, but multiple calls won't hurt

    :param setup: A Bcfg2 options dict
    :type setup: dict
    :returns: :class:`pulp.client.api.server.PulpServer`
    if not HAS_PULP:
        msg = "Packages: Cannot create Pulp collection: Pulp libraries " + \
            "not found"
        raise Bcfg2.Server.Plugin.PluginInitError(msg)

    if PULPSERVER is None:
            username = setup.cfp.get("packages:pulp", "username")
            password = setup.cfp.get("packages:pulp", "password")
        except ConfigParser.NoSectionError:
            msg = "Packages: No [pulp] section found in bcfg2.conf"
            raise Bcfg2.Server.Plugin.PluginInitError(msg)
        except ConfigParser.NoOptionError:
            msg = "Packages: Required option not found in bcfg2.conf: %s" % \
            raise Bcfg2.Server.Plugin.PluginInitError(msg)

        PULPCONFIG = ConsumerConfig()
        serveropts = PULPCONFIG.server

        PULPSERVER = server.PulpServer(serveropts['host'],
        PULPSERVER.set_basic_auth_credentials(username, password)
    return PULPSERVER

[docs]class PulpCertificateData(Bcfg2.Server.Plugin.SpecificData): """ Handle pulp consumer certificate data for :class:`PulpCertificateSet` """
[docs] def bind_entry(self, entry, _): """ Given an abstract entry, add data to it and return it. :class:`PulpCertificateSet` handles binding entry metadata. :param entry: The abstract entry to bind data to :type entry: lxml.etree._Element :returns: lxml.etree._Element - the bound entry """ entry.set("type", "file") if entry.text = else: entry.set("empty", "true") return entry
[docs]class PulpCertificateSet(Bcfg2.Server.Plugin.EntrySet): """ Handle Pulp consumer certificates. """ #: The path to certificates on consumer machines certpath = "/etc/pki/consumer/cert.pem" def __init__(self, path, fam): """ :param path: The path to the directory where Pulp consumer certificates will be stored :type path: string """ Bcfg2.Server.Plugin.EntrySet.__init__(self, os.path.basename(self.certpath), path, PulpCertificateData, "UTF-8") self.metadata = dict(owner='root', group='root', mode='0644', secontext='__default__', important='true', sensitive='true', paranoid=self.metadata['paranoid']) self.fam = fam self.fam.AddMonitor(path, self)
[docs] def HandleEvent(self, event): """ Handle FAM events on certificate files. :param event: The event to handle :type event: Bcfg2.Server.FileMonitor.Event """ if event.filename != self.path: return self.handle_event(event)
[docs] def write_data(self, data, metadata): """ Write a new certificate to the filesystem. :param data: The new certificate data :type data: string :param metadata: Metadata for the client to write the certificate for :type metadata: Bcfg2.Server.Plugins.Metadata.ClientMetadata """ specific = "%s.H_%s" % (os.path.basename(self.certpath), metadata.hostname) fileloc = os.path.join(self.path, specific)"Packages: Writing certificate data for %s to %s" % (metadata.hostname, fileloc)) try: open(fileloc, 'wb').write(data) except IOError: err = sys.exc_info()[1] self.logger.error("Could not write %s: %s" % (fileloc, err)) return self.verify_file(specific)
[docs] def verify_file(self, filename): """ Service the FAM events queued up by the key generation so the data structure entries will be available for binding. NOTE: We wait for up to ten seconds. There is some potential for race condition, because if the file monitor doesn't get notified about the new key files in time, those entries won't be available for binding. In practice, this seems "good enough." :param filename: The filename to check for events on :type filename: string """ tries = 0 updated = False while not updated: if tries >= 10: self.logger.error("%s still not registered" % filename) return self.fam.handle_events_in_interval(1) if filename in self.entries: break else: tries += 1 continue
[docs]class YumCollection(Collection): """ Handle collections of Yum sources. If we're using the yum Python libraries, then this becomes a very full-featured :class:`Bcfg2.Server.Plugins.Packages.Collection.Collection` object; if not, then it defers to the :class:`YumSource` object. .. private-include: _add_gpg_instances, _get_pulp_consumer """ _helper = None #: Options that are included in the [packages:yum] section of the #: config but that should not be included in the temporary #: yum.conf we write out option_blacklist = ["use_yum_libraries", "helper"] #: :class:`PulpCertificateSet` object used to handle Pulp certs pulp_cert_set = None def __init__(self, metadata, sources, cachepath, basepath, fam, debug=False): Collection.__init__(self, metadata, sources, cachepath, basepath, fam, debug=debug) self.keypath = os.path.join(self.cachepath, "keys") #: A :class:`Bcfg2.Utils.Executor` object to use to run #: external commands self.cmd = Executor() if self.use_yum: #: Define a unique cache file for this collection to use #: for cached yum metadata self.cachefile = os.path.join(self.cachepath, "cache-%s" % self.cachekey) #: The path to the server-side config file used when #: resolving packages with the Python yum libraries self.cfgfile = os.path.join(self.cachefile, "yum.conf") if not os.path.exists(self.cachefile): self.debug_log("Creating common cache %s" % self.cachefile) os.mkdir(self.cachefile) if not self.disableMetaData: self.setup_data() else: self.cachefile = None if HAS_PULP and self.has_pulp_sources: _setup_pulp(self.setup) if self.pulp_cert_set is None: certdir = os.path.join( self.basepath, "pulp", os.path.basename(PulpCertificateSet.certpath)) try: os.makedirs(certdir) except OSError: err = sys.exc_info()[1] if err.errno == errno.EEXIST: pass else: self.logger.error("Could not create Pulp consumer " "cert directory at %s: %s" % (certdir, err)) self.__class__.pulp_cert_set = PulpCertificateSet(certdir, self.fam) @property
[docs] def disableMetaData(self): # pylint: disable=C0103 """ Report whether or not metadata processing is enabled. This duplicates code in Packages/, and can probably be removed in Bcfg2 1.4 when we have a module-level setup object. """ if self.setup is None: return True try: return not self.setup.cfp.getboolean("packages", "resolver") except (ConfigParser.NoSectionError, ConfigParser.NoOptionError): return False except ValueError: # for historical reasons we also accept "enabled" and # "disabled" return self.setup.cfp.get( "packages", "metadata", default="enabled").lower() == "disabled"
@property def __package_groups__(self): return True @property
[docs] def helper(self): """ The full path to :file:`bcfg2-yum-helper`. First, we check in the config file to see if it has been explicitly specified; next we see if it's in $PATH (which we do by making a call to it; I wish there was a way to do this without forking, but apparently not); finally we check in /usr/sbin, the default location. """ # pylint: disable=W0212 if not self.__class__._helper: try: self.__class__._helper = self.setup.cfp.get("packages:yum", "helper") except (ConfigParser.NoOptionError, ConfigParser.NoSectionError): # first see if bcfg2-yum-helper is in PATH try: self.debug_log("Checking for bcfg2-yum-helper in $PATH")['bcfg2-yum-helper']) self.__class__._helper = 'bcfg2-yum-helper' except OSError: self.__class__._helper = "/usr/sbin/bcfg2-yum-helper" return self.__class__._helper # pylint: enable=W0212
[docs] def use_yum(self): """ True if we should use the yum Python libraries, False otherwise """ return HAS_YUM and self.setup.cfp.getboolean("packages:yum", "use_yum_libraries", default=False)
[docs] def has_pulp_sources(self): """ True if there are any Pulp sources to handle, False otherwise """ return any(s.pulp_id for s in self)
[docs] def cachefiles(self): """ A list of the full path to all cachefiles used by this collection.""" cachefiles = set(Collection.cachefiles.fget(self)) if self.cachefile: cachefiles.add(self.cachefile) return list(cachefiles)
[docs] def write_config(self): """ Write the server-side config file to :attr:`cfgfile` based on the data from :func:`get_config`""" if not os.path.exists(self.cfgfile): yumconf = self.get_config(raw=True) yumconf.add_section("main") # we set installroot to the cache directory so # bcfg2-yum-helper works with an empty rpmdb. otherwise # the rpmdb is so hopelessly intertwined with yum that we # have to totally reinvent the dependency resolver. mainopts = dict(cachedir='/', persistdir='/', installroot=self.cachefile, keepcache="0", debuglevel="0", sslverify="0", reposdir="/dev/null") if self.setup['debug']: mainopts['debuglevel'] = "5" elif self.setup['verbose']: mainopts['debuglevel'] = "2" try: for opt in self.setup.cfp.options("packages:yum"): if opt not in self.option_blacklist: mainopts[opt] = self.setup.cfp.get("packages:yum", opt) except ConfigParser.NoSectionError: pass for opt, val in list(mainopts.items()): yumconf.set("main", opt, val) yumconf.write(open(self.cfgfile, 'w'))
[docs] def get_arch(self): """ If 'arch' for each source is the same, return that arch, otherwise None. This helps bcfg2-yum-helper when the client arch is incompatible with the bcfg2 server's arch. In case multiple arches are found, punt back to the default behavior. """ arches = set() for source in self: for url_map in source.url_map: if url_map['arch'] in self.metadata.groups: arches.add(url_map['arch']) if len(arches) == 1: return arches.pop() else: return None
[docs] def get_config(self, raw=False): # pylint: disable=W0221 """ Get the yum configuration for this collection. :param raw: Return a :class:`ConfigParser.SafeConfigParser` object representing the configuration instead of a string. This is useful if you need to modify the config before writing it (as :func:`write_config` does in order to produce a server-specific configuration). :type raw: bool :returns: string or ConfigParser.SafeConfigParser """ config = ConfigParser.SafeConfigParser() for source in self: for url_map in source.url_map: if url_map['arch'] not in self.metadata.groups: continue basereponame = source.get_repo_name(url_map) reponame = basereponame added = False while not added: try: config.add_section(reponame) added = True except ConfigParser.DuplicateSectionError: match ='-(\d+)', reponame) if match: rid = int( + 1 else: rid = 1 reponame = "%s-%d" % (basereponame, rid) config.set(reponame, "name", reponame) config.set(reponame, "baseurl", url_map['url']) config.set(reponame, "enabled", "1") if len(source.gpgkeys): config.set(reponame, "gpgcheck", "1") config.set(reponame, "gpgkey", " ".join(source.gpgkeys)) else: config.set(reponame, "gpgcheck", "0") if len(source.blacklist): config.set(reponame, "exclude", " ".join(source.blacklist)) if len(source.whitelist): config.set(reponame, "includepkgs", " ".join(source.whitelist)) if raw: opts = source.server_options else: opts = source.client_options for opt, val in opts.items(): config.set(reponame, opt, val) if raw: return config else: # configparser only writes to file, so we have to use a # StringIO object to get the data out as a string buf = StringIO() config.write(buf) return "# This config was generated automatically by the Bcfg2 " \ "Packages plugin\n\n" + buf.getvalue()
[docs] def build_extra_structures(self, independent): """ Add additional entries to the ``<Independent/>`` section of the final configuration. This adds several kinds of entries: * For GPG keys, adds a ``Package`` entry that describes the version and release of all expected ``gpg-pubkey`` packages; and ``Path`` entries to copy all of the GPG keys to the appropriate place on the client filesystem. Calls :func:`_add_gpg_instances`. * For Pulp Sources, adds a ``Path`` entry for the consumer certificate; and ``Action`` entries to update the consumer-side Pulp config if the consumer is newly registered. Creates a new Pulp consumer from the Bcfg2 server as necessary. :param independent: The XML tag to add extra entries to. This is modified in place. :type independent: lxml.etree._Element """ needkeys = set() for source in self: for key in source.gpgkeys: needkeys.add(key) if len(needkeys): if HAS_YUM: # this must be be HAS_YUM, not use_yum, because # regardless of whether the user wants to use the yum # resolver we want to include gpg key data keypkg = lxml.etree.Element('BoundPackage', name="gpg-pubkey", type=self.ptype, origin='Packages') else: self.logger.warning("GPGKeys were specified for yum sources " "in sources.xml, but no yum libraries " "were found") self.logger.warning("GPG key version/release data cannot be " "determined automatically") self.logger.warning("Install yum libraries, or manage GPG " "keys manually") keypkg = None for key in needkeys: # figure out the path of the key on the client keydir = self.setup.cfp.get("global", "gpg_keypath", default="/etc/pki/rpm-gpg") remotekey = os.path.join(keydir, os.path.basename(key)) localkey = os.path.join(self.keypath, os.path.basename(key)) kdata = open(localkey).read() # copy the key to the client keypath = lxml.etree.Element("BoundPath", name=remotekey, encoding='ascii', owner='root', group='root', type='file', mode='0644', important='true') keypath.text = kdata # hook to add version/release info if possible self._add_gpg_instances(keypkg, localkey, remotekey, keydata=kdata) independent.append(keypath) if keypkg is not None: independent.append(keypkg) if self.has_pulp_sources: consumerapi = ConsumerAPI() consumer = self._get_pulp_consumer(consumerapi=consumerapi) if consumer is None: try: consumer = \ consumerapi.create(self.metadata.hostname, self.metadata.hostname, capabilities=dict(bind=False)) lxml.etree.SubElement( independent, "BoundAction", name="pulp-update", timing="pre", when="always", status="check", command="pulp-consumer consumer update") self.pulp_cert_set.write_data(consumer['certificate'], self.metadata) except server.ServerRequestError: err = sys.exc_info()[1] self.logger.error("Packages: Could not create Pulp " "consumer %s: %s" % (self.metadata.hostname, err)) for source in self: # each pulp source can only have one arch, so we don't # have to check the arch in url_map if (source.pulp_id and source.pulp_id not in consumer['repoids']): try: consumerapi.bind(self.metadata.hostname, source.pulp_id) except server.ServerRequestError: err = sys.exc_info()[1] self.logger.error("Packages: Could not bind %s to " "Pulp repo %s: %s" % (self.metadata.hostname, source.pulp_id, err)) crt = lxml.etree.SubElement(independent, "BoundPath", name=self.pulp_cert_set.certpath) self.pulp_cert_set.bind_entry(crt, self.metadata)
[docs] def _get_pulp_consumer(self, consumerapi=None): """ Get a Pulp consumer object for the client. :param consumerapi: A Pulp ConsumerAPI object. If none is passed, one will be instantiated. :type consumerapi: pulp.client.api.consumer.ConsumerAPI :returns: dict - the consumer. Returns None on failure (including if there is no existing Pulp consumer for this client. """ if consumerapi is None: consumerapi = ConsumerAPI() consumer = None try: consumer = consumerapi.consumer(self.metadata.hostname) except server.ServerRequestError: # consumer does not exist pass except socket.error: err = sys.exc_info()[1] self.logger.error("Packages: Could not contact Pulp server: %s" % err) except: err = sys.exc_info()[1] self.logger.error("Packages: Unknown error querying Pulp server: " "%s" % err) return consumer
[docs] def _add_gpg_instances(self, keyentry, localkey, remotekey, keydata=None): """ Add GPG keys instances to a ``Package`` entry. This is called from :func:`build_extra_structures` to add GPG keys to the specification. :param keyentry: The ``Package`` entry to add key instances to. This will be modified in place. :type keyentry: lxml.etree._Element :param localkey: The full path to the key file on the Bcfg2 server :type localkey: string :param remotekey: The full path to the key file on the client. (If they key is not yet on the client, this will be the full path to where the key file will go eventually.) :type remotekey: string :param keydata: The contents of the key file. If this is not provided, read the data from ``localkey``. :type keydata: string """ # this must be be HAS_YUM, not use_yum, because regardless of # whether the user wants to use the yum resolver we want to # include gpg key data if not HAS_YUM: return if keydata is None: keydata = open(localkey).read() try: kinfo = yum.misc.getgpgkeyinfo(keydata) version = yum.misc.keyIdToRPMVer(kinfo['keyid']) release = yum.misc.keyIdToRPMVer(kinfo['timestamp']) lxml.etree.SubElement(keyentry, 'Instance', version=version, release=release, simplefile=remotekey) except ValueError: err = sys.exc_info()[1] self.logger.error("Packages: Could not read GPG key %s: %s" % (localkey, err))
[docs] def get_groups(self, grouplist): """ If using the yum libraries, given a list of package group names, return a dict of ``<group name>: <list of packages>``. This is much faster than implementing :func:`Bcfg2.Server.Plugins.Packages.Collection.Collection.get_group`, since we have to make a call to the bcfg2 Yum helper, and each time we do that we make another call to yum, which means we set up yum metadata from the cache (hopefully) each time. So resolving ten groups once is much faster than resolving one group ten times. If you are using the builtin yum parser, this raises a warning and returns an empty dict. :param grouplist: The list of groups to query :type grouplist: list of strings - group names :returns: dict of ``<group name>: <list of packages>`` In this implementation the packages may be strings or tuples. See :ref:`yum-pkg-objects` for more information. """ if not grouplist: return dict() gdicts = [] for group, ptype in grouplist: if group.startswith("@"): group = group[1:] if not ptype: ptype = "default" gdicts.append(dict(group=group, type=ptype)) if self.use_yum: try: return self.call_helper("get_groups", inputdata=gdicts) except ValueError: return dict() else: pkgs = dict() for gdict in gdicts: pkgs[gdict['group']] = Collection.get_group(self, gdict['group'], gdict['type']) return pkgs
def _element_to_pkg(self, el, name): """ Convert a Package or Instance element to a package tuple """ rv = (name, el.get("arch"), el.get("epoch"), el.get("version"), el.get("release")) if rv[3] in ['any', 'auto']: rv = (rv[0], rv[1], rv[2], None, None) # if a package requires no specific version, we just use # the name, not the tuple. this limits the amount of JSON # encoding/decoding that has to be done to pass the # package list to bcfg2-yum-helper. if rv[1:] == (None, None, None, None): return name else: return rv
[docs] def packages_from_entry(self, entry): """ When using the Python yum libraries, convert a Package entry to a list of package tuples. See :ref:`yum-pkg-objects` and :ref:`pkg-objects` for more information on this process. :param entry: The Package entry to convert :type entry: lxml.etree._Element :returns: list of tuples """ if not self.use_yum: return Collection.packages_from_entry(self, entry) rv = set() name = entry.get("name") for inst in entry.getchildren(): if inst.tag != "Instance": continue rv.add(self._element_to_pkg(inst, name)) if not rv: rv.add(self._element_to_pkg(entry, name)) return list(rv)
def _get_entry_attrs(self, pkgtup): """ Given a package tuple, return a dict of attributes suitable for applying to either a Package or an Instance tag """ attrs = dict(version=self.setup.cfp.get("packages", "version", default="auto")) if attrs['version'] == 'any' or not isinstance(pkgtup, tuple): return attrs try: if pkgtup[1]: attrs['arch'] = pkgtup[1] if pkgtup[2]: attrs['epoch'] = pkgtup[2] if pkgtup[3]: attrs['version'] = pkgtup[3] if pkgtup[4]: attrs['release'] = pkgtup[4] except IndexError: self.logger.warning("Malformed package tuple: %s" % pkgtup) return attrs
[docs] def packages_to_entry(self, pkglist, entry): """ When using the Python yum libraries, convert a list of package tuples to a Package entry. See :ref:`yum-pkg-objects` and :ref:`pkg-objects` for more information on this process. If pkglist contains only one package, then its data is converted to a single ``BoundPackage`` entry that is added as a subelement of ``entry``. If pkglist contains more than one package, then a parent ``BoundPackage`` entry is created and child ``Instance`` entries are added to it. :param pkglist: A list of package tuples to convert to an XML Package entry :type pkglist: list of tuples :param entry: The base XML entry to add Package entries to. This is modified in place. :type entry: lxml.etree._Element :returns: None """ if not self.use_yum: return Collection.packages_to_entry(self, pkglist, entry) packages = dict() for pkg in pkglist: try: packages[pkg[0]].append(pkg) except KeyError: packages[pkg[0]] = [pkg] for name, instances in packages.items(): pkgattrs = dict(type=self.ptype, origin='Packages', name=name) if len(instances) > 1: pkg_el = lxml.etree.SubElement(entry, 'BoundPackage', **pkgattrs) for inst in instances: lxml.etree.SubElement(pkg_el, "Instance", self._get_entry_attrs(inst)) else: attrs = self._get_entry_attrs(instances[0]) attrs.update(pkgattrs) lxml.etree.SubElement(entry, 'BoundPackage', **attrs)
[docs] def get_new_packages(self, initial, complete): """ Compute the difference between the complete package list (as returned by :func:`complete`) and the initial package list computed from the specification, allowing for package tuples. See :ref:`yum-pkg-objects` and :ref:`pkg-objects` for more information on this process. :param initial: The initial package list :type initial: set of strings, but see :ref:`pkg-objects` :param complete: The final package list :type complete: set of strings, but see :ref:`pkg-objects` :return: set of tuples """ initial_names = [] for pkg in initial: if isinstance(pkg, tuple): initial_names.append(pkg[0]) else: initial_names.append(pkg) new = [] for pkg in complete: if isinstance(pkg, tuple): name = pkg[0] else: name = pkg if name not in initial_names: new.append(pkg) return new
[docs] def complete(self, packagelist): """ Build a complete list of all packages and their dependencies. When using the Python yum libraries, this defers to the :ref:`bcfg2-yum-helper`; when using the builtin yum parser, this defers to :func:`Bcfg2.Server.Plugins.Packages.Collection.Collection.complete`. :param packagelist: Set of initial packages computed from the specification. :type packagelist: set of strings, but see :ref:`pkg-objects` :returns: tuple of sets - The first element contains a set of strings (but see :ref:`pkg-objects`) describing the complete package list, and the second element is a set of symbols whose dependencies could not be resolved. """ if not self.use_yum: return Collection.complete(self, packagelist) lock = FileLock(os.path.join(self.cachefile, "lock")) slept = 0 while lock.is_locked(): if slept > 30: self.logger.warning("Packages: Timeout waiting for yum cache " "to release its lock") return set(), set() self.logger.debug("Packages: Yum cache is locked, waiting...") time.sleep(3) slept += 3 if packagelist: try: helper_dict = dict(packages=list(packagelist), groups=list(self.get_relevant_groups())) arch = self.get_arch() if arch is not None: helper_dict['arch'] = arch result = self.call_helper("complete", helper_dict) except ValueError: # error reported by call_helper() return set(), packagelist # json doesn't understand sets or tuples, so we get back a # lists of lists (packages) and a list of unicode strings # (unknown). turn those into a set of tuples and a set of # strings, respectively. unknown = set([str(u) for u in result['unknown']]) packages = set([tuple(p) for p in result['packages']]) self.filter_unknown(unknown) return packages, unknown else: return set(), set()
[docs] def call_helper(self, command, inputdata=None): """ Make a call to :ref:`bcfg2-yum-helper`. 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. :param command: The :ref:`bcfg2-yum-helper` command to call. :type command: string :param inputdata: The input to pass to ``bcfg2-yum-helper`` on stdin. If this is None, no input will be given at all. :type inputdata: Any JSON-encodable data structure. :returns: Varies depending on the return value of the ``bcfg2-yum-helper`` command. """ cmd = [self.helper, "-c", self.cfgfile] if self.setup['verbose']: cmd.append("-v") if self.debug_flag: if not self.setup['verbose']: # ensure that running in debug gets -vv, even if # verbose is not enabled cmd.append("-v") cmd.append("-v") cmd.append(command) self.debug_log("Packages: running %s" % " ".join(cmd)) if inputdata: result =, timeout=self.setup['client_timeout'], inputdata=json.dumps(inputdata)) else: result =, timeout=self.setup['client_timeout']) if not result.success: self.logger.error("Packages: error running bcfg2-yum-helper: %s" % result.error) elif result.stderr: self.debug_log("Packages: debug info from bcfg2-yum-helper: %s" % result.stderr) try: return json.loads(result.stdout) except ValueError: if result.stdout: err = sys.exc_info()[1] self.logger.error("Packages: Error reading bcfg2-yum-helper " "output: %s" % err) self.logger.error("Packages: bcfg2-yum-helper output: %s" % result.stdout) else: self.logger.error("Packages: No bcfg2-yum-helper output") raise
[docs] def setup_data(self, force_update=False): """ Do any collection-level data setup tasks. This is called when sources are loaded or reloaded by :class:`Bcfg2.Server.Plugins.Packages.Packages`. If the builtin yum parsers are in use, this defers to :func:`Bcfg2.Server.Plugins.Packages.Collection.Collection.setup_data`. If using the yum Python libraries, this cleans up cached yum metadata, regenerates the server-side yum config (in order to catch any new sources that have been added to this server), then regenerates the yum cache. :param force_update: Ignore all local cache and setup data from its original upstream sources (i.e., the package repositories) :type force_update: bool """ if not self.use_yum: return Collection.setup_data(self, force_update) if force_update: # clean up data from the old config try: self.call_helper("clean") except ValueError: # error reported by call_helper pass if os.path.exists(self.cfgfile): os.unlink(self.cfgfile) self.write_config() try: self.call_helper("makecache") except ValueError: # error reported by call_helper pass
[docs]class YumSource(Source): """ Handle yum sources """ #: :ref:`server-plugins-generators-packages-magic-groups` for #: ``YumSource`` are "yum", "redhat", "centos", and "fedora" basegroups = ['yum', 'redhat', 'centos', 'fedora'] #: YumSource sets the ``type`` on Package entries to "yum" ptype = 'yum' def __init__(self, basepath, xsource, setup): self.filemap = dict() self.file_to_arch = dict() self.needed_paths = set() self.packages = dict() self.yumgroups = dict() self.pulp_id = None self.repo = None Source.__init__(self, basepath, xsource, setup) __init__.__doc__ = Source.__init__.__doc__ def _init_attributes(self, xsource): Source._init_attributes(self, xsource) if HAS_PULP and xsource.get("pulp_id"): self.pulp_id = xsource.get("pulp_id") _setup_pulp(self.setup) repoapi = RepositoryAPI() try: self.repo = repoapi.repository(self.pulp_id) self.gpgkeys = [os.path.join(PULPCONFIG.cds['keyurl'], key) for key in repoapi.listkeys(self.pulp_id)] except server.ServerRequestError: err = sys.exc_info()[1] if err[0] == 401: msg = "Packages: Error authenticating to Pulp: %s" % err[1] elif err[0] == 404: msg = "Packages: Pulp repo id %s not found: %s" % \ (self.pulp_id, err[1]) else: msg = "Packages: Error %d fetching pulp repo %s: %s" % \ (err[0], self.pulp_id, err[1]) raise SourceInitError(msg) except socket.error: err = sys.exc_info()[1] raise SourceInitError("Could not contact Pulp server: %s" % err) except: err = sys.exc_info()[1] raise SourceInitError("Unknown error querying Pulp server: %s" % err) self.rawurl = "%s/%s" % (PULPCONFIG.cds['baseurl'], self.repo['relative_path']) self.arches = [self.repo['arch']] self.deps = dict([('global', dict())]) self.provides = dict([('global', dict())]) self.filemap = dict([(x, dict()) for x in ['global'] + self.arches]) _init_attributes.__doc__ = Source._init_attributes.__doc__ @property
[docs] def use_yum(self): """ True if we should use the yum Python libraries, False otherwise """ return HAS_YUM and self.setup.cfp.getboolean("packages:yum", "use_yum_libraries", default=False)
[docs] def save_state(self): """ If using the builtin yum parser, save state to :attr:`cachefile`. If using the Python yum libraries, yum handles caching and state and this method is a no-op.""" if not self.use_yum: cache = open(self.cachefile, 'wb') cPickle.dump((self.packages, self.deps, self.provides, self.filemap, self.url_map, self.yumgroups), cache, 2) cache.close()
[docs] def load_state(self): """ If using the builtin yum parser, load saved state from :attr:`cachefile`. If using the Python yum libraries, yum handles caching and state and this method is a no-op.""" if not self.use_yum: data = open(self.cachefile) (self.packages, self.deps, self.provides, self.filemap, self.url_map, self.yumgroups) = cPickle.load(data)
[docs] def urls(self): """ A list of URLs to the base metadata file for each repository described by this source. """ rv = [] for umap in self.url_map: rv.extend(self._get_urls_from_repodata(umap['url'], umap['arch'])) return rv
def _get_urls_from_repodata(self, url, arch): """ When using the builtin yum parser, given the base URL of a repository, return the URLs of the various repo metadata files needed to get package data from the repo. If using the yum Python libraries, this just returns ``url`` as it was passed in, but should realistically not be called. :param url: The base URL to the repository (i.e., the directory that contains the ``repodata/`` directory) :type url: string :param arch: The architecture of the directory. :type arch: string :return: list of strings - URLs to metadata files """ if self.use_yum: return [url] rmdurl = '%srepodata/repomd.xml' % url try: repomd = fetch_url(rmdurl) except ValueError: self.logger.error("Packages: Bad url string %s" % rmdurl) return [] except HTTPError: err = sys.exc_info()[1] self.logger.error("Packages: Failed to fetch url %s. code=%s" % (rmdurl, err.code)) return [] except URLError: err = sys.exc_info()[1] self.logger.error("Packages: Failed to fetch url %s. %s" % (rmdurl, err)) return [] try: xdata = lxml.etree.XML(repomd) except lxml.etree.XMLSyntaxError: err = sys.exc_info()[1] self.logger.error("Packages: Failed to process metadata at %s: %s" % (rmdurl, err)) return [] urls = [] for elt in xdata.findall(RPO + 'data'): if elt.get('type') in ['filelists', 'primary', 'group']: floc = elt.find(RPO + 'location') fullurl = url + floc.get('href') urls.append(fullurl) self.file_to_arch[self.escape_url(fullurl)] = arch return urls # pylint: disable=R0911,R0912 # disabling the pylint errors above because we are interesting in # replicating the flow of the RPM code. def _compare_rpm_versions(self, str1, str2): """ Compare RPM versions. This is an attempt to reimplement RPM's rpmvercmp method in python. :param str1: package 1 version string :param str2: package 2 version string :return: 1 - str1 is newer than str2 0 - str1 and str2 are the same version -1 - str2 is newer than str1""" if str1 == str2: return 0 front_strip_re = re.compile('^[^A-Za-z0-9~]+') risdigit = re.compile('(^[0-9]+)') risalpha = re.compile('(^[A-Za-z])') lzeroes = re.compile('^0+') while len(str1) > 0 or len(str2) > 0: str1 = front_strip_re.sub('', str1) str2 = front_strip_re.sub('', str2) if len(str1) == 0 or len(str2) == 0: break # handle the tilde separator if str1[0] == '~' and str2[0] == '~': str1 = str1[1:] str2 = str2[1:] elif str1[0] == '~': return -1 elif str2[0] == '~': return 1 # grab continuous segments from each string isnum = False if risdigit.match(str1): segment1 = risdigit.split(str1)[1] str1 = risdigit.split(str1)[2] if risdigit.match(str2): segment2 = risdigit.split(str2)[1] str2 = risdigit.split(str2)[2] else: segment2 = '' isnum = True else: segment1 = risalpha.split(str1)[1] str1 = risalpha.split(str1)[2] if risalpha.match(str2): segment2 = risalpha.split(str2)[1] str2 = risalpha.split(str2)[2] else: segment2 = '' # numeric segments are always newer than alpha segments if len(segment2) == 0: if isnum: return 1 return -1 if isnum: # discard leading zeroes segment1 = lzeroes.sub('', segment1) segment2 = lzeroes.sub('', segment2) # higher number has more digits if len(segment1) > len(segment2): return 1 elif len(segment2) > len(segment1): return -1 # do a simple string comparison if segment1 > segment2: return 1 elif segment2 > segment1: return -1 # if one of the strings is empty, the version of the longer # string is higher if len(str1) > len(str2): return 1 elif len(str2) > len(str1): return -1 else: return 0 # pylint: enable=R0911,R0912 @Bcfg2.Server.Plugin.track_statistics()
[docs] def read_files(self): """ When using the builtin yum parser, read and parse locally downloaded metadata files. This diverges from the stock :func:`Bcfg2.Server.Plugins.Packages.Source.Source.read_files` quite a bit. """ # we have to read primary.xml first, and filelists.xml afterwards; primaries = list() filelists = list() groups = list() for fname in self.files: if fname.endswith('primary.xml.gz'): primaries.append(fname) elif fname.endswith('filelists.xml.gz'): filelists.append(fname) elif fname.find('comps'): groups.append(fname) for fname in primaries: farch = self.file_to_arch[fname] fdata = lxml.etree.parse(fname).getroot() self.parse_primary(fdata, farch) for fname in filelists: farch = self.file_to_arch[fname] fdata = lxml.etree.parse(fname).getroot() self.parse_filelist(fdata, farch) for fname in groups: fdata = lxml.etree.parse(fname).getroot() self.parse_group(fdata) # merge data sdata = list(self.packages.values()) try: self.packages['global'] = copy.deepcopy(sdata.pop()) except IndexError: self.logger.error("Packages: No packages in repo") self.packages['global'] = set() while sdata: self.packages['global'].update(sdata.pop()) for key in self.packages: if key == 'global': continue self.packages[key] = \ self.packages[key].difference(self.packages['global']) self.save_state()
[docs] def parse_filelist(self, data, arch): """ parse filelists.xml.gz data """ if arch not in self.filemap: self.filemap[arch] = dict() for pkg in data.findall(FL + 'package'): for fentry in pkg.findall(FL + 'file'): if fentry.text in self.needed_paths: if fentry.text in self.filemap[arch]: self.filemap[arch][fentry.text].add(pkg.get('name')) else: self.filemap[arch][fentry.text] = \ set([pkg.get('name')])
[docs] def parse_primary(self, data, arch): """ parse primary.xml.gz data """ if arch not in self.packages: self.packages[arch] = set() if arch not in self.deps: self.deps[arch] = {} if arch not in self.provides: self.provides[arch] = {} versionmap = {} for pkg in data.getchildren(): if not pkg.tag.endswith('package'): continue pkgname = pkg.find(XP + 'name').text vtag = pkg.find(XP + 'version') epoch = vtag.get('epoch') version = vtag.get('ver') release = vtag.get('rel') if pkgname in self.packages[arch]: # skip if version older than a previous version if (self._compare_rpm_versions( epoch, versionmap[pkgname]['epoch']) < 0): continue elif (self._compare_rpm_versions( version, versionmap[pkgname]['version']) < 0): continue elif (self._compare_rpm_versions( release, versionmap[pkgname]['release']) < 0): continue versionmap[pkgname] = {} versionmap[pkgname]['epoch'] = epoch versionmap[pkgname]['version'] = version versionmap[pkgname]['release'] = release self.packages[arch].add(pkgname) pdata = pkg.find(XP + 'format') self.deps[arch][pkgname] = set() pre = pdata.find(RP + 'requires') if pre is not None: for entry in pre.getchildren(): self.deps[arch][pkgname].add(entry.get('name')) if entry.get('name').startswith('/'): self.needed_paths.add(entry.get('name')) pro = pdata.find(RP + 'provides') if pro is not None: for entry in pro.getchildren(): prov = entry.get('name') if prov not in self.provides[arch]: self.provides[arch][prov] = list() self.provides[arch][prov].append(pkgname)
[docs] def parse_group(self, data): """ parse comps.xml.gz data """ for group in data.getchildren(): if not group.tag.endswith('group'): continue try: groupid = group.xpath('id')[0].text self.yumgroups[groupid] = {'mandatory': list(), 'default': list(), 'optional': list(), 'conditional': list()} except IndexError: continue try: packagelist = group.xpath('packagelist')[0] except IndexError: continue for pkgreq in packagelist.getchildren(): pkgtype = pkgreq.get('type', None) if pkgtype == 'mandatory': self.yumgroups[groupid]['mandatory'].append(pkgreq.text) elif pkgtype == 'default': self.yumgroups[groupid]['default'].append(pkgreq.text) elif pkgtype == 'optional': self.yumgroups[groupid]['optional'].append(pkgreq.text) elif pkgtype == 'conditional': self.yumgroups[groupid]['conditional'].append(pkgreq.text)
[docs] def is_package(self, metadata, package): arch = [a for a in self.arches if a in metadata.groups] if not arch: return False try: return ((package in self.packages['global'] or package in self.packages[arch[0]]) and package not in self.blacklist and (len(self.whitelist) == 0 or package in self.whitelist)) except KeyError: self.logger.debug("Packages: Unable to find %s for arch %s" % (package, arch[0])) return False
is_package.__doc__ = Source.is_package.__doc__
[docs] def get_vpkgs(self, metadata): if self.use_yum: return dict() rv = Source.get_vpkgs(self, metadata) for arch, fmdata in list(self.filemap.items()): if arch not in metadata.groups and arch != 'global': continue for filename, pkgs in list(fmdata.items()): rv[filename] = pkgs return rv
get_vpkgs.__doc__ = Source.get_vpkgs.__doc__
[docs] def unknown_filter(self, package): """ By default, :class:`Bcfg2.Server.Plugins.Packages.Source.Source` filters out unknown packages that start with "choice", but that doesn't mean anything to Yum or RPM. Instead, we filter out unknown packages that start with "rpmlib", although this is likely legacy behavior; that would seem to indicate that a package required some RPM feature that isn't provided, which is a bad thing. This should probably go away at some point. :param package: The name of a package that was unknown to the backend :type package: string :returns: bool """ return package.startswith("rpmlib")
[docs] def filter_unknown(self, unknown): if self.use_yum: filtered = set() for unk in unknown: try: if self.unknown_filter(unk): filtered.update(unk) except AttributeError: try: if self.unknown_filter(unk[0]): filtered.update(unk) except (IndexError, AttributeError): pass unknown.difference_update(filtered) else: Source.filter_unknown(self, unknown)
filter_unknown.__doc__ = Source.filter_unknown.__doc__
[docs] def setup_data(self, force_update=False): if not self.use_yum: Source.setup_data(self, force_update=force_update)
setup_data.__doc__ = \ "``setup_data`` is only used by the builtin yum parser. " + \ Source.setup_data.__doc__
[docs] def get_repo_name(self, url_map): """ Try to find a sensible name for a repository. First use a repository's Pulp ID, if it has one; if not, then defer to :class:`Bcfg2.Server.Plugins.Packages.Source.Source.get_repo_name` :param url_map: A single :attr:`url_map` dict, i.e., any single element of :attr:`url_map`. :type url_map: dict :returns: string - the name of the repository. """ if self.pulp_id: return self.pulp_id else: return Source.get_repo_name(self, url_map)
[docs] def get_group(self, metadata, group, ptype=None): # pylint: disable=W0613 """ Get the list of packages of the given type in a package group. :param group: The name of the group to query :type group: string :param ptype: The type of packages to get, for backends that support multiple package types in package groups (e.g., "recommended," "optional," etc.) :type ptype: string :returns: list of strings - package names """ try: yumgroup = self.yumgroups[group] except KeyError: return [] packages = yumgroup['conditional'] + yumgroup['mandatory'] if ptype in ['default', 'optional', 'all']: packages += yumgroup['default'] if ptype in ['optional', 'all']: packages += yumgroup['optional'] return packages