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"""This module implements a config file repository."""
__revision__ = '$Revision$'
import binascii
import logging
import lxml
import os
import re
import tempfile
import Bcfg2.Server.Plugin
try:
import genshi.core
import genshi.input
from genshi.template import TemplateLoader, \
TextTemplate, MarkupTemplate, TemplateError
from genshi.template import NewTextTemplate
have_genshi = True
except:
have_genshi = False
logger = logging.getLogger('Bcfg2.Plugins.Cfg')
# snipped from TGenshi
def removecomment(stream):
"""A genshi filter that removes comments from the stream."""
for kind, data, pos in stream:
if kind is genshi.core.COMMENT:
continue
yield kind, data, pos
def process_delta(data, delta):
if not delta.specific.delta:
return data
if delta.specific.delta == 'cat':
datalines = data.split('\n')
for line in delta.data.split('\n'):
if not line:
continue
if line[0] == '+':
datalines.append(line[1:])
elif line[0] == '-':
if line[1:] in datalines:
datalines.remove(line[1:])
return "\n".join(datalines)
elif delta.specific.delta == 'diff':
basehandle, basename = tempfile.mkstemp()
basefile = open(basename, 'w')
basefile.write(data)
basefile.close()
os.close(basehandle)
dhandle, dname = tempfile.mkstemp()
dfile = open(dname, 'w')
dfile.write(delta.data)
dfile.close()
os.close(dhandle)
ret = os.system("patch -uf %s < %s > /dev/null 2>&1" \
% (basefile.name, dfile.name))
output = open(basefile.name, 'r').read()
[os.unlink(fname) for fname in [basefile.name, dfile.name]]
if ret >> 8 != 0:
raise Bcfg2.Server.Plugin.PluginExecutionError, ('delta', delta)
return output
class CfgMatcher:
def __init__(self, fname):
name = re.escape(fname)
self.basefile_reg = re.compile('^(?P<basename>%s)(|\\.H_(?P<hostname>\S+?)|.G(?P<prio>\d+)_(?P<group>\S+?))(?P<genshi>\\.genshi)?$' % name)
self.delta_reg = re.compile('^(?P<basename>%s)(|\\.H_(?P<hostname>\S+)|\\.G(?P<prio>\d+)_(?P<group>\S+))\\.(?P<delta>(cat|diff))$' % name)
self.cat_count = fname.count(".cat")
self.diff_count = fname.count(".diff")
def match(self, fname):
if fname.count(".cat") > self.cat_count \
or fname.count('.diff') > self.diff_count:
return self.delta_reg.match(fname)
return self.basefile_reg.match(fname)
class CfgEntrySet(Bcfg2.Server.Plugin.EntrySet):
def __init__(self, basename, path, entry_type, encoding):
Bcfg2.Server.Plugin.EntrySet.__init__(self, basename, path,
entry_type, encoding)
self.specific = CfgMatcher(path.split('/')[-1])
def sort_by_specific(self, one, other):
return cmp(one.specific, other.specific)
def get_pertinent_entries(self, metadata):
"""return a list of all entries pertinent
to a client => [base, delta1, delta2]
"""
matching = [ent for ent in self.entries.values() if \
ent.specific.matches(metadata)]
matching.sort(self.sort_by_specific)
non_delta = [matching.index(m) for m in matching
if not m.specific.delta]
if not non_delta:
raise Bcfg2.Server.Plugin.PluginExecutionError
base = min(non_delta)
used = matching[:base + 1]
used.reverse()
return used
def bind_entry(self, entry, metadata):
self.bind_info_to_entry(entry, metadata)
used = self.get_pertinent_entries(metadata)
basefile = used.pop(0)
if entry.tag == 'Path':
entry.set('type', 'file')
if basefile.name.endswith(".genshi"):
if not have_genshi:
logger.error("Cfg: Genshi is not available")
raise Bcfg2.Server.Plugin.PluginExecutionError
try:
template_cls = NewTextTemplate
loader = TemplateLoader()
template = loader.load(basefile.name, cls=template_cls,
encoding=self.encoding)
stream = template.generate( \
name=entry.get('name'), metadata=metadata,
path=basefile.name).filter(removecomment)
try:
data = stream.render('text', strip_whitespace=False)
except TypeError:
data = stream.render('text')
if data == '':
entry.set('empty', 'true')
except Exception, e:
logger.error("Cfg: genshi exception: %s" % e)
raise Bcfg2.Server.Plugin.PluginExecutionError
else:
data = basefile.data
for delta in used:
data = data.strip()
data = process_delta(data, delta)
if used:
data += '\n'
if entry.get('encoding') == 'base64':
entry.text = binascii.b2a_base64(data)
else:
try:
entry.text = unicode(data, self.encoding)
except UnicodeDecodeError, e:
logger.error("Failed to decode %s: %s" % (entry.get('name'), e))
logger.error("Please verify you are using the proper encoding.")
raise Bcfg2.Server.Plugin.PluginExecutionError
if entry.text in ['', None]:
entry.set('empty', 'true')
def list_accept_choices(self, metadata):
'''return a list of candidate pull locations'''
used = self.get_pertinent_entries(metadata)
ret = []
if used:
ret.append(used[0].specific)
if not ret[0].hostname:
ret.append(Bcfg2.Server.Plugin.Specificity(hostname=metadata.hostname))
return ret
def build_filename(self, specific):
bfname = self.path + '/' + self.path.split('/')[-1]
if specific.all:
return bfname
elif specific.group:
return "%s.G%d_%s" % (bfname, specific.prio, specific.group)
elif specific.hostname:
return "%s.H_%s" % (bfname, specific.hostname)
def write_update(self, specific, new_entry, log):
if 'text' in new_entry:
name = self.build_filename(specific)
if name.endswith(".genshi"):
logger.error("Cfg: Unable to pull data for genshi types")
raise PluginExecutionError
open(name, 'w').write(new_entry['text'])
if log:
logger.info("Wrote file %s" % name)
badattr = [attr for attr in ['owner', 'group', 'perms']
if attr in new_entry]
if badattr:
metadata_updates = {}
metadata_updates.update(self.metadata)
for attr in badattr:
metadata_updates[attr] = new_entry.get(attr)
infoxml = lxml.etree.Element('FileInfo')
infotag = lxml.etree.SubElement(infoxml, 'Info')
[infotag.attrib.__setitem__(attr, metadata_updates[attr]) \
for attr in metadata_updates]
ofile = open(self.path + "/info.xml", "w")
ofile.write(lxml.etree.tostring(infoxml, pretty_print=True))
ofile.close()
if log:
logger.info("Wrote file %s" % (self.path + "/info.xml"))
class Cfg(Bcfg2.Server.Plugin.GroupSpool,
Bcfg2.Server.Plugin.PullTarget):
"""This generator in the configuration file repository for Bcfg2."""
name = 'Cfg'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
es_cls = CfgEntrySet
es_child_cls = Bcfg2.Server.Plugin.SpecificData
def AcceptChoices(self, entry, metadata):
return self.entries[entry.get('name')].list_accept_choices(metadata)
def AcceptPullData(self, specific, new_entry, log):
return self.entries[new_entry.get('name')].write_update(specific,
new_entry,
log)
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