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""" set group membership based on client hostnames """
import os
import re
import sys
import Bcfg2.Server.Lint
import Bcfg2.Server.Plugin
from Bcfg2.Utils import PackedDigitRange
class PatternMap(object):
""" Handler for a single pattern or range """
def __init__(self, pattern, rangestr, groups):
self.pattern = pattern
self.rangestr = rangestr
self.groups = groups
if pattern is not None:
self.re = re.compile(pattern)
self.process = self.process_re
elif rangestr is not None:
if '\\' in rangestr:
raise Exception("Backslashes are not allowed in NameRanges")
range_finder = r'\[\[[\d\-,]+\]\]'
self.process = self.process_range
self.re = re.compile(r'^' + re.sub(range_finder, r'(\d+)',
rangestr))
dmatcher = re.compile(re.sub(range_finder,
r'\[\[([\d\-,]+)\]\]',
rangestr))
self.dranges = [PackedDigitRange(x)
for x in dmatcher.match(rangestr).groups()]
else:
raise Exception("No pattern or range given")
def process_range(self, name):
""" match the given hostname against a range-based NameRange """
match = self.re.match(name)
if not match:
return None
digits = match.groups()
for grp in range(len(digits)):
if not self.dranges[grp].includes(digits[grp]):
return None
return self.groups
def process_re(self, name):
""" match the given hostname against a regex-based NamePattern """
match = self.re.search(name)
if not match:
return None
ret = list()
sub = match.groups()
for group in self.groups:
newg = group
for idx in range(len(sub)):
newg = newg.replace('$%s' % (idx + 1), sub[idx])
ret.append(newg)
return ret
def __str__(self):
return "%s: %s %s" % (self.__class__.__name__, self.pattern,
self.groups)
class PatternFile(Bcfg2.Server.Plugin.XMLFileBacked):
""" representation of GroupPatterns config.xml """
__identifier__ = None
create = 'GroupPatterns'
def __init__(self, filename, core=None):
try:
fam = core.fam
except AttributeError:
fam = None
Bcfg2.Server.Plugin.XMLFileBacked.__init__(self, filename, fam=fam,
should_monitor=True)
self.core = core
self.patterns = []
def Index(self):
Bcfg2.Server.Plugin.XMLFileBacked.Index(self)
if (self.core and
self.core.metadata_cache_mode in ['cautious', 'aggressive']):
self.core.metadata_cache.expire()
self.patterns = []
for entry in self.xdata.xpath('//GroupPattern'):
try:
groups = [g.text for g in entry.findall('Group')]
for pat_ent in entry.findall('NamePattern'):
pat = pat_ent.text
self.patterns.append(PatternMap(pat, None, groups))
for range_ent in entry.findall('NameRange'):
rng = range_ent.text
self.patterns.append(PatternMap(None, rng, groups))
except: # pylint: disable=W0702
self.logger.error("GroupPatterns: Failed to initialize "
"pattern %s: %s" % (entry.text,
sys.exc_info()[1]))
def process_patterns(self, hostname):
""" return a list of groups that should be added to the given
client based on patterns that match the hostname """
ret = []
for pattern in self.patterns:
try:
grps = pattern.process(hostname)
if grps is not None:
ret.extend(grps)
except: # pylint: disable=W0702
self.logger.error("GroupPatterns: Failed to process pattern "
"%s for %s" % (pattern.pattern, hostname),
exc_info=1)
return ret
class GroupPatterns(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Connector):
""" set group membership based on client hostnames """
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Connector.__init__(self)
self.config = PatternFile(os.path.join(self.data, 'config.xml'),
core=core)
def get_additional_groups(self, metadata):
return self.config.process_patterns(metadata.hostname)
class GroupPatternsLint(Bcfg2.Server.Lint.ServerPlugin):
""" ``bcfg2-lint`` plugin to check all given :ref:`GroupPatterns
<server-plugins-grouping-grouppatterns>` patterns for validity.
This is simply done by trying to create a
:class:`Bcfg2.Server.Plugins.GroupPatterns.PatternMap` object for
each pattern, and catching exceptions and presenting them as
``bcfg2-lint`` errors."""
def Run(self):
cfg = self.core.plugins['GroupPatterns'].config
for entry in cfg.xdata.xpath('//GroupPattern'):
groups = [g.text for g in entry.findall('Group')]
self.check(entry, groups, ptype='NamePattern')
self.check(entry, groups, ptype='NameRange')
@classmethod
def Errors(cls):
return {"pattern-fails-to-initialize": "error"}
def check(self, entry, groups, ptype="NamePattern"):
""" Check a single pattern for validity """
if ptype == "NamePattern":
pmap = lambda p: PatternMap(p, None, groups)
else:
pmap = lambda p: PatternMap(None, p, groups)
for el in entry.findall(ptype):
pat = el.text
try:
pmap(pat)
except: # pylint: disable=W0702
err = sys.exc_info()[1]
self.LintError("pattern-fails-to-initialize",
"Failed to initialize %s %s for %s: %s" %
(ptype, pat, entry.get('pattern'), err))
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