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'''This module implements a config file repository'''
__revision__ = '$Revision$'
import binascii, difflib, logging, os, re, tempfile, \
xml.sax.saxutils, Bcfg2.Server.Plugin, lxml.etree
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()
self.usable = True
except:
logger.error("Failed to read file %s" % self.name)
def bind_entry(self, entry, _):
if entry.get('encoding') == 'base64':
entry.text = binascii.b2a_base64(self.data)
else:
entry.text = self.data
class CfgMatcher:
def __init__(self, fname):
name = re.escape(fname)
self.basefile_reg = re.compile('^%s(|\\.H_(?P<hostname>\S+)|.G(?P<prio>\d+)_(?P<group>\S+))$' % name)
self.delta_reg = re.compile('^%s(|\\.H_(?P<hostname>\S+)|\\.G(?P<prio>\d+)_(?P<group>\S+))\\.(?P<delta>(cat|diff))$' % 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 bind_entry(self, entry, metadata):
matching = [ent for ent in self.entries.values() if \
ent.specific.matches(metadata)]
if [ent for ent in matching if ent.specific.delta]:
self.bind_info_to_entry(entry, 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()
# used is now [base, delta1, delta2]
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
else:
Bcfg2.Server.Plugin.EntrySet.bind_entry(self, entry, metadata)
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 AcceptEntry(self, meta, _, entry_name, diff, fulldata, metadata_updates={}):
'''per-plugin bcfg2-admin pull support'''
if metadata_updates:
if hasattr(self.Entries['ConfigFile'][entry_name], 'infoxml'):
print "InfoXML support not yet implemented"
elif raw_input("Should metadata updates apply to all hosts? (n/Y) ") in ['Y', 'y']:
self.entries[entry_name].metadata.update(metadata_updates)
infofile = open(self.entries[entry_name].repopath + '/:info', 'w')
for x in self.entries[entry_name].metadata.iteritems():
infofile.write("%s: %s\n" % x)
infofile.close()
if not diff and not fulldata:
raise SystemExit, 0
hsq = "Found host-specific file %s; Should it be updated (n/Y): "
repo_vers = lxml.etree.Element('ConfigFile', name=entry_name)
self.Entries['ConfigFile'][entry_name](repo_vers, meta)
repo_curr = repo_vers.text
# find the file fragment
basefile = [frag for frag in \
self.entries[entry_name].fragments \
if frag.applies(meta)][-1]
gsq = "Should this change apply to all hosts effected by file %s? (N/y): " % (basefile.name)
if ".H_%s" % (meta.hostname) in basefile.name:
answer = raw_input(hsq % basefile.name)
else:
answer = raw_input(gsq)
if answer in ['Y', 'y']:
print "writing file, %s" % basefile.name
if fulldata:
newdata = fulldata
else:
newdata = '\n'.join(difflib.restore(diff.split('\n'), 1))
open(basefile.name, 'w').write(newdata)
return
if ".H_%s" % (meta.hostname) in basefile.name:
raise SystemExit, 1
# figure out host-specific filename
reg = re.compile("(.*)\.G\d+.*")
if reg.match(basefile.name):
newname = reg.match(basefile.name).group(1) + ".H_%s" % (meta.hostname)
else:
newname = basefile.name + ".H_%s" % (meta.hostname)
print "This file will be installed as file %s" % newname
if raw_input("Should it be installed? (N/y): ") in ['Y', 'y']:
print "writing file, %s" % newname
if fulldata:
newdata = fulldata
else:
newdata = '\n'.join(difflib.restore(diff.split('\n'), 1))
open(newname, 'w').write(newdata)
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