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'''This module implements a package management scheme for all images'''
import re
import sys
import logging
import lxml.etree
import Bcfg2.Server.Plugin
from Bcfg2.Server.Plugin import PluginExecutionError
logger = logging.getLogger('Bcfg2.Plugins.Pkgmgr')
class FuzzyDict(dict):
fuzzy = re.compile(r'(?P<name>.*):(?P<alist>\S+(,\S+)*)')
def __getitem__(self, key):
if isinstance(key, str):
mdata = self.fuzzy.match(key)
if mdata:
return dict.__getitem__(self, mdata.groupdict()['name'])
else:
print("got non-string key %s" % str(key))
return dict.__getitem__(self, key)
def __contains__(self, key):
if isinstance(key, str):
mdata = self.fuzzy.match(key)
if mdata:
return dict.__contains__(self, mdata.groupdict()['name'])
else:
print("got non-string key %s" % str(key))
return dict.__contains__(self, key)
def get(self, key, default=None):
try:
return self.__getitem__(key)
except:
if default:
return default
raise
class PNode(object):
"""PNode has a list of packages available at a
particular group intersection.
"""
splitters = dict(
rpm=re.compile(
r'^(.*/)?(?P<name>[\w\+\d\.]+(-[\w\+\d\.]+)*)-' +
r'(?P<version>[\w\d\.]+-([\w\d\.]+))\.(?P<arch>\S+)\.rpm$'),
encap=re.compile(
r'^(?P<name>[\w-]+)-(?P<version>[\w\d\.+-]+).encap.*$'))
raw = dict(
Client="lambda m, e:'%(name)s' == m.hostname and predicate(m, e)",
Group="lambda m, e:'%(name)s' in m.groups and predicate(m, e)")
nraw = dict(
Client="lambda m, e:'%(name)s' != m.hostname and predicate(m, e)",
Group="lambda m, e:'%(name)s' not in m.groups and predicate(m, e)")
containers = ['Group', 'Client']
ignore = ['Package']
def __init__(self, data, pdict, parent=None):
# copy local attributes to all child nodes if no local attribute exists
if 'Package' not in pdict:
pdict['Package'] = set()
for child in data.getchildren():
attrs = set(data.attrib.keys()).difference(
child.attrib.keys() + ['name'])
for attr in attrs:
try:
child.set(attr, data.get(attr))
except:
# don't fail on things like comments and other
# immutable elements
pass
self.data = data
self.contents = {}
if parent is None:
self.predicate = lambda m, e: True
else:
predicate = parent.predicate
if data.get('negate', 'false').lower() == 'true':
psrc = self.nraw
else:
psrc = self.raw
if data.tag in list(psrc.keys()):
self.predicate = eval(psrc[data.tag] %
{'name': data.get('name')},
{'predicate': predicate})
else:
raise PluginExecutionError("Unknown tag: %s" % data.tag)
self.children = []
self._load_children(data, pdict)
if 'Package' not in self.contents:
self.contents['Package'] = FuzzyDict()
for pkg in data.findall('./Package'):
if ('name' in pkg.attrib and
pkg.get('name') not in pdict['Package']):
pdict['Package'].add(pkg.get('name'))
if pkg.get('name') is not None:
self.contents['Package'][pkg.get('name')] = {}
if pkg.getchildren():
self.contents['Package'][pkg.get('name')]['__children__'] \
= pkg.getchildren()
if 'simplefile' in pkg.attrib:
pkg.set('url',
"%s/%s" % (pkg.get('uri'), pkg.get('simplefile')))
self.contents['Package'][pkg.get('name')].update(pkg.attrib)
else:
if 'file' in pkg.attrib:
if 'multiarch' in pkg.attrib:
archs = pkg.get('multiarch').split()
srcs = pkg.get('srcs', pkg.get('multiarch')).split()
url = ' '.join(
["%s/%s" % (pkg.get('uri'),
pkg.get('file') % {'src': srcs[idx],
'arch': archs[idx]})
for idx in range(len(archs))])
pkg.set('url', url)
else:
pkg.set('url', '%s/%s' % (pkg.get('uri'),
pkg.get('file')))
if (pkg.get('type') in self.splitters and
pkg.get('file') is not None):
mdata = \
self.splitters[pkg.get('type')].match(pkg.get('file'))
if not mdata:
logger.error("Failed to match pkg %s" %
pkg.get('file'))
continue
pkgname = mdata.group('name')
self.contents['Package'][pkgname] = mdata.groupdict()
self.contents['Package'][pkgname].update(pkg.attrib)
if pkg.attrib.get('file'):
self.contents['Package'][pkgname]['url'] = \
pkg.get('url')
self.contents['Package'][pkgname]['type'] = \
pkg.get('type')
if pkg.get('verify'):
self.contents['Package'][pkgname]['verify'] = \
pkg.get('verify')
if pkg.get('multiarch'):
self.contents['Package'][pkgname]['multiarch'] = \
pkg.get('multiarch')
if pkgname not in pdict['Package']:
pdict['Package'].add(pkgname)
if pkg.getchildren():
self.contents['Package'][pkgname]['__children__'] = \
pkg.getchildren()
else:
self.contents['Package'][pkg.get('name')].update(
pkg.attrib)
def _load_children(self, data, idict):
""" load children """
for item in data.getchildren():
if item.tag in self.ignore:
continue
elif item.tag in self.containers:
self.children.append(self.__class__(item, idict, self))
else:
try:
self.contents[item.tag][item.get('name')] = \
dict(item.attrib)
except KeyError:
self.contents[item.tag] = \
{item.get('name'): dict(item.attrib)}
if item.text:
self.contents[item.tag][item.get('name')]['__text__'] = \
item.text
if item.getchildren():
self.contents[item.tag][item.get('name')]['__children__'] \
= item.getchildren()
try:
idict[item.tag].append(item.get('name'))
except KeyError:
idict[item.tag] = [item.get('name')]
def Match(self, metadata, data, entry=lxml.etree.Element("None")):
"""Return a dictionary of package mappings."""
if self.predicate(metadata, entry):
for key in self.contents:
try:
data[key].update(self.contents[key])
except: # pylint: disable=W0702
data[key] = FuzzyDict()
data[key].update(self.contents[key])
for child in self.children:
child.Match(metadata, data)
class PkgSrc(Bcfg2.Server.Plugin.XMLFileBacked):
""" XMLSrc files contain a
:class:`Bcfg2.Server.Plugin.helpers.INode` hierarchy that returns
matching entries. XMLSrc objects are deprecated and
:class:`Bcfg2.Server.Plugin.helpers.StructFile` should be
preferred where possible."""
__node__ = PNode
__cacheobj__ = FuzzyDict
__priority_required__ = True
def __init__(self, filename, should_monitor=False):
Bcfg2.Server.Plugin.XMLFileBacked.__init__(self, filename,
should_monitor)
self.items = {}
self.cache = None
self.pnode = None
self.priority = -1
def HandleEvent(self, _=None):
"""Read file upon update."""
try:
data = open(self.name).read()
except IOError:
msg = "Failed to read file %s: %s" % (self.name, sys.exc_info()[1])
logger.error(msg)
raise PluginExecutionError(msg)
self.items = {}
try:
xdata = lxml.etree.XML(data, parser=Bcfg2.Server.XMLParser)
except lxml.etree.XMLSyntaxError:
msg = "Failed to parse file %s: %s" % (self.name,
sys.exc_info()[1])
logger.error(msg)
raise PluginExecutionError(msg)
self.pnode = self.__node__(xdata, self.items)
self.cache = None
try:
self.priority = int(xdata.get('priority'))
except (ValueError, TypeError):
if self.__priority_required__:
msg = "Got bogus priority %s for file %s" % \
(xdata.get('priority'), self.name)
logger.error(msg)
raise PluginExecutionError(msg)
del xdata, data
def Cache(self, metadata):
"""Build a package dict for a given host."""
if self.cache is None or self.cache[0] != metadata:
cache = (metadata, self.__cacheobj__())
if self.pnode is None:
logger.error("Cache method called early for %s; "
"forcing data load" % self.name)
self.HandleEvent()
return
self.pnode.Match(metadata, cache[1])
self.cache = cache
def __str__(self):
return str(self.items)
class Pkgmgr(Bcfg2.Server.Plugin.PrioDir):
"""This is a generator that handles package assignments."""
name = 'Pkgmgr'
__author__ = 'bcfg-dev@mcs.anl.gov'
__child__ = PkgSrc
__element__ = 'Package'
def HandleEvent(self, event):
'''Handle events and update dispatch table'''
Bcfg2.Server.Plugin.XMLDirectoryBacked.HandleEvent(self, event)
for src in list(self.entries.values()):
for itype, children in list(src.items.items()):
for child in children:
try:
self.Entries[itype][child] = self.BindEntry
except KeyError:
self.Entries[itype] = FuzzyDict([(child,
self.BindEntry)])
def BindEntry(self, entry, metadata):
"""Bind data for entry, and remove instances that are not requested."""
pname = entry.get('name')
Bcfg2.Server.Plugin.PrioDir.BindEntry(self, entry, metadata)
if entry.findall('Instance'):
mdata = FuzzyDict.fuzzy.match(pname)
if mdata:
arches = mdata.group('alist').split(',')
for inst in entry.findall('Instance'):
if inst.get('arch') not in arches:
entry.remove(inst)
def HandlesEntry(self, entry, metadata):
return (
entry.tag == 'Package' and
entry.get('name').split(':')[0] in self.Entries['Package'].keys())
def HandleEntry(self, entry, metadata):
self.BindEntry(entry, metadata)
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