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#!/usr/bin/env python
'''Bcfg2 Client'''
__revision__ = '$Revision$'
from lxml.etree import Element, XML, tostring, XMLSyntaxError
import logging, os, signal, sys, tempfile, time, traceback, xmlrpclib
import Bcfg2.Options
try:
import Bcfg2.Client.Proxy, Bcfg2.Logging
except KeyError:
print "Could not read options from configuration file"
raise SystemExit, 1
def cb_sigint_handler(signum, frame):
'''Exit upon CTRL-C'''
os._exit(1)
class Client:
''' The main bcfg2 client class '''
def __init__(self):
self.toolset = None
self.config = None
optinfo = {
# 'optname': (('-a', argdesc, optdesc),
# env, cfpath, default, boolean)),
'verbose':(('-v', False,"enable verbose output"),
False, False, False, True),
'quick':(('-q', False, "disable some checksum verification"),
False, False, False, True),
'debug':(('-d', False, "enable debugging output"),
False, False, False, True),
'dryrun':(('-n', False, "do not actually change the system"),
False, False, False, True),
'build': (('-B', False, "run in build mode"),
False, False, False, True),
'paranoid':(('-P', False, "make automatic backups of config files"),
False, False, False, True),
'bundle':(('-b', '<bundle>', "only configure the given bundle"),
False, False, False, False),
'file': (('-f', "<configspec>", "configure from a file rather than querying the server"),
False, False, False, False),
'cache': (('-c', "<configspec>", "store the configuration in a file"),
False, False, False, False),
'profile': (('-p', '<profile>', "assert the given profile for the host"),
False, False, False, False),
'remove': (('-r', '(packages|services|all)', "force removal of additional configuration items"),
False, False, False, False),
'help': (('-h', False, "print this help message"),
False, False, False, False),
'setup': (('-C', '<configfile>', "use given config file (default /etc/bcfg2.conf)"),
False, False, '/etc/bcfg2.conf', False),
'server': (('-S', '<server url>', 'the server hostname to connect to'),
False, ('components', 'bcfg2'), 'https://localhost:6789', False),
'user': (('-u', '<user>', 'the user to provide for authentication'),
False, ('communication', 'user'), 'root', False),
'password': (('-x', '<password>', 'the password to provide for authentication'),
False, ('communication', 'password'), 'password', False),
'retries': (('-R', '<numretries>', 'the number of times to retry network communication'),
False, ('communication', 'retries'), '3', False),
}
self.setup = Bcfg2.Options.OptionParser('bcfg2', optinfo).parse()
level = 30
if self.setup['verbose']:
level = 20
if self.setup['debug']:
level = 0
Bcfg2.Logging.setup_logging('bcfg2', to_syslog=False, level=level)
self.logger = logging.getLogger('bcfg2')
self.logger.debug(self.setup)
if self.setup['remove'] not in [False, 'all', 'services', 'packages']:
self.logger.error("Got unknown argument %s for -r" % (self.setup['remove']))
if (self.setup["file"] != False) and (self.setup["cache"] != False):
print "cannot use -f and -c together"
raise SystemExit, 1
if self.setup['remove'] and self.setup['dryrun']:
print "cannot use -n and -r together"
raise SystemExit, 1
def load_toolset(self, toolset_name):
'''Import client toolset modules'''
toolset_packages = {
'debian': "Bcfg2.Client.Debian",
'rh': "Bcfg2.Client.Redhat",
'solaris': "Bcfg2.Client.Solaris"
}
if toolset_packages.has_key(toolset_name):
toolset_class = toolset_packages[toolset_name]
else:
toolset_class = toolset_name
try:
mod = __import__(toolset_class, globals(), locals(), ['*'])
except:
self.fatal_error("got unsupported toolset %s from server."
% (toolset_name))
try:
self.toolset = mod.ToolsetImpl(self.config, self.setup)
self.logger.debug("Selected %s toolset..." % (toolset_name))
except:
self.critical_error("instantiating toolset %s" %
(toolset_name))
def run_probe(self, probe):
'''Execute probe'''
probe_name = probe.attrib['name']
ret = Element("probe-data", probe_name, source=probe.attrib['source'])
try:
script = open(tempfile.mktemp(), 'w+')
try:
script.write("#!%s\n" %
(probe.attrib.get('interpreter', '/bin/sh')))
script.write(probe.text)
script.close()
os.chmod(script.name, 0755)
ret.text = os.popen(script.name).read()
finally:
os.unlink(script.name)
except:
self.critical_error("executing probe %s" % (probe_name))
return ret
def critical_error(self, operation):
'''Print tracebacks in unexpected cases'''
print "Traceback information (please include in any bug report):"
(ttype, value, trace) = sys.exc_info()
for line in traceback.extract_tb(trace):
print "File %s, line %i, in %s\n %s\n" % (line)
print "%s: %s\n" % (ttype, value)
self.fatal_error("An unexpected failure occurred in %s" % (operation) )
def fatal_error(self, message):
'''Signal a fatal error'''
print "Fatal error: %s" % (message)
raise SystemExit, 1
def run(self):
''' Perform client execution phase '''
times = {}
# begin configuration
times['start'] = time.time()
if self.setup['file']:
# read config from file
try:
self.logger.debug("reading cached configuration from %s" %
(self.setup['file']))
configfile = open(self.setup['file'], 'r')
rawconfig = configfile.read()
configfile.close()
except IOError:
self.fatal_error("failed to read cached configuration from: %s"
% (self.setup['file']))
else:
# retrieve config from server
proxy = Bcfg2.Client.Proxy.bcfg2()
if self.setup['profile']:
proxy.AssertProfile(self.setup['profile'])
try:
probe_data = proxy.GetProbes()
except xmlrpclib.Fault:
self.logger.error("Failed to download probes from bcfg2")
raise SystemExit, 1
times['probe_download'] = time.time()
try:
probes = XML(probe_data)
except XMLSyntaxError, syntax_error:
self.fatal_error(
"server returned invalid probe requests: %s" %
(syntax_error))
# execute probes
try:
probe_info = [self.run_probe(probe)
for probe in probes.findall(".//probe")]
except:
self.critical_error("executing probes")
# upload probe responses
proxy.RecvProbeData(probe_info)
times['probe_upload'] = time.time()
try:
rawconfig = proxy.GetConfig()
except xmlrpclib.Fault:
self.logger.error("Failed to download configuration from bcfg2")
raise SystemExit, 2
times['config_download'] = time.time()
if self.setup['cache']:
try:
open(self.setup['cache'], 'w').write(rawconfig)
os.chmod(self.setup['cache'], 33152)
except IOError:
self.logger.warning("failed to write config cache file %s" %
(self.setup['cache']))
times['caching'] = time.time()
try:
self.config = XML(rawconfig)
except XMLSyntaxError, syntax_error:
self.fatal_error("the configuration could not be parsed: %s" %
(syntax_error))
times['config_parse'] = time.time()
if self.config.tag == 'error':
self.fatal_error("server error: %s" % (self.config.text))
# Get toolset from server
try:
toolset_name = self.config.get('toolset')
except:
self.fatal_error("server did not specify a toolset")
if self.setup['bundle']:
replacement_xml = Element("Configuration", version='2.0')
for child in self.config.getchildren():
if ((child.tag == 'Bundle') and
(child.attrib['name'] == self.setup['bundle'])):
replacement_xml.append(child)
self.config = replacement_xml
# Create toolset handle
self.load_toolset(toolset_name)
times['initialization'] = time.time()
# verify state
self.toolset.Inventory()
times['inventory'] = time.time()
# summarize current state
self.toolset.CondDisplayState('initial')
# install incorrect aspects of configuration
self.toolset.Install()
self.toolset.CondDisplayState('final')
times['install'] = time.time()
times['finished'] = time.time()
if not self.setup['file'] and not self.setup['bundle']:
# upload statistics
feedback = Element("upload-statistics")
timeinfo = Element("OpStamps")
for (event, timestamp) in times.iteritems():
timeinfo.set(event, str(timestamp))
stats = self.toolset.GenerateStats(__revision__)
stats.append(timeinfo)
feedback.append(stats)
try:
proxy.RecvStats(tostring(feedback))
except xmlrpclib.Fault:
self.logger.error("Failed to upload configuration statistics")
raise SystemExit, 2
if __name__ == '__main__':
signal.signal(signal.SIGINT, cb_sigint_handler)
Client().run()
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