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'''This module implements a config file repository'''
__revision__ = '$Revision$'
import binascii, logging, os, re, tempfile, Bcfg2.Server.Plugin
logger = logging.getLogger('Bcfg2.Plugins.Cfg')
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) + "\n"
elif delta.op == 'diff':
basefile = open(tempfile.mktemp(), 'w')
basefile.write(data)
basefile.close()
dfile = open(tempfile.mktemp(), 'w')
dfile.write(delta.data)
dfile.close()
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 CfgEntry(object):
def __init__(self, name, _, specific):
self.name = name
self.specific = specific
def handle_event(self, event):
if event.code2str() == 'deleted':
return
try:
self.data = open(self.name).read()
except:
logger.error("Failed to read file %s" % self.name)
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+))$' % name)
self.delta_reg = re.compile('^(?P<basename>%s)(|\\.H_(?P<hostname>\S+)|\\.G(?P<prio>\d+)_(?P<group>\S+))\\.(?P<delta>(cat|diff))$' % fname)
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, props, entry_type):
Bcfg2.Server.Plugin.EntrySet.__init__(self, basename, path, props, entry_type)
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)
base = min([matching.index(ent) for ent in matching
if not ent.specific.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()
data = basefile.data
for delta in used:
data = process_delta(data, delta)
if entry.get('encoding') == 'base64':
entry.text = binascii.b2a_base64(data)
else:
entry.text = data
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)
if len(used) > 1:
return []
return [used[0].specific]
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.group, specific.prio)
elif specific.hostname:
return "%s.H_%s" % (bfname, specific.hostname)
def write_update(self, specific, new_entry, log):
name = self.build_filename(specific)
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:
if hasattr(self.entries[name.split('/')[-1]], 'infoxml'):
print "InfoXML support not yet implemented"
return
metadata_updates = {}
metadata_updates.update(self.metadata)
for attr in badattr:
metadata_updates[attr] = new_entry.get('attr')
infofile = open(self.path + '/:info', 'w')
for x in metadata_updates.iteritems():
infofile.write("%s: %s\n" % x)
infofile.close()
if log:
logger.info("Wrote file %s" % infofile.name)
class Cfg(Bcfg2.Server.Plugin.GroupSpool):
'''This generator in the configuration file repository for bcfg2'''
__name__ = 'Cfg'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
use_props = False
es_cls = CfgEntrySet
es_child_cls = CfgEntry
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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