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#!/usr/bin/python
# vim: set fileencoding=utf-8 :
#
# Configure and enable munin libvirt plugins
#
# Copyright 2008 Guido Guenther <agx@sigxcpu.org>
#
# Licesnse: GPLv2
#
# Detect connection uri and enable plugins
import os
import sys
from optparse import OptionParser
try:
import libvirt
has_libvirt = True
except ImportError:
has_libvirt = False
URIS = [ "xen:///", "qemu:///system" ]
PLUGIN_CONF = "::MUNINCONFDIR::/plugin-conf.d/libvirt"
PLUGINS = [ "blkstat", "cputime", "ifstat", "mem" ]
PLUGIN_SRC = "::PLUGINDIR::"
PLUGIN_DST = "::MUNINCONFDIR::/plugins/"
def check_uris(uris, force=False):
detected = None
for uri in uris:
try:
libvirt.openReadOnly(uri)
detected = uri
break
except libvirt.libvirtError, err:
pass
if detected:
print "Hypervisor at %s detected." % detected
if not os.path.exists(PLUGIN_CONF) or force:
try:
conf = file(PLUGIN_CONF, "w+")
print >>conf, "[libvirt-*]"
print >>conf, "env.uri %s""" % detected
conf.close()
except IOError, err:
print >>sys.stderr, err
return 1
else:
print >>sys.stderr, "Plugin configuration '%s' already exists - doing nothing" % PLUGIN_CONF
return 0
def enable_plugins(force=False):
for plugin in map(lambda x: "libvirt-" + x, PLUGINS):
src = os.path.join(PLUGIN_SRC, plugin)
dst = os.path.join(PLUGIN_DST, plugin)
if force:
try:
os.unlink(dst)
except OSError:
pass
if os.path.exists(dst):
print >>sys.stderr, "Plugin '%s' already enabled - doing nothing" % plugin
else:
print >>sys.stderr, "Enabling plugin '%s'" % plugin
os.symlink(src, dst)
return 0
def restart_munin_node():
act = dict(service='munin-node', action='restart')
for path in [ '/usr/sbin/invoke-rc.d',
'/sbin/service' ]:
if os.path.exists(path):
act['exec'] = path
ret = os.system('%(exec)s %(service)s %(action)s' % act)
return ret
else:
if os.path.exists('/etc/init.d/%(service)s' % act):
ret = os.system('/etc/init.d/%(service)s %(action)s' % act)
return ret
return 1
def main(args):
parser = OptionParser(usage="%prog [-f] [uris]", version="%prog ::VERSION::")
parser.add_option("-f", "--force", action="store_true", dest="force", default=False,
help="overwrite files and symlinks")
parser.add_option("-r", "--restart", action="store_true", dest="restart", default=False,
help="restart munin-node to let changes take effect")
(options, args) = parser.parse_args(args)
if len(args) > 1:
uris = args[1:]
else:
uris = URIS
if not has_libvirt:
print >>sys.stderr, "Libvirt not available."
return 1
ret = check_uris(uris, options.force)
if ret:
return ret
ret = enable_plugins(options.force)
if ret:
return ret
if options.restart:
ret = restart_munin_node()
return ret
if __name__ == "__main__":
sys.exit(main(sys.argv))
# vim:et:ts=4:sw=4:
|
