oz-generate-icicle

#!/usr/bin/env python

# Copyright (C) 2010,2011  Chris Lalancette <clalance@redhat.com>

# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation;
# version 2.1 of the License.

# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

import sys
import getopt
import os
import logging
import stat
import ConfigParser

import oz.TDL
import oz.GuestFactory

def usage():
    print "Usage: oz-generate-icicle [OPTIONS] <tdl> <libvirt_xml_file>"
    print " OPTIONS:"
    print "  -c <config>\tGet config from <config> (default is /etc/oz/oz.cfg)"
    print "  -d <level>\tTurn up logging level.  The levels are:"
    print "\t\t\t0 - errors only (this is the default)"
    print "\t\t\t1 - errors and warnings"
    print "\t\t\t2 - errors, warnings, and information"
    print "\t\t\t3 - all messages"
    print "\t\t\t4 - all messages, prepended with the level and classname"
    print "  -h\t\tPrint this help message"
    print "  -i <icicle>\tWrite the ICICLE to <icicle>"
    print " Currently supported architectures are:"
    print "   i386, x86_64"
    print " Currently supported distros are:"
    oz.GuestFactory.distrolist()
    sys.exit(1)

try:
    opts, args = getopt.gnu_getopt(sys.argv[1:], 'c:d:hi:', ['config', 'debug',
                                                             'help', 'icicle'])
except getopt.GetoptError, err:
    print str(err)
    usage()

loglevel = logging.ERROR
logformat = "%(message)s"
config_file = "/etc/oz/oz.cfg"
icicle_file = None
for o, a in opts:
    if o in ("-c", "--config"):
        config_file = a
    elif o in ("-d", "--debug"):
        try:
            d_int = int(a)
        except ValueError:
            usage()
        if d_int == 0:
            loglevel = logging.ERROR
        elif d_int == 1:
            loglevel = logging.WARNING
        elif d_int == 2:
            loglevel = logging.INFO
        elif d_int == 3:
            loglevel = logging.DEBUG
        elif d_int >= 4:
            loglevel = logging.DEBUG
            logformat = logging.BASIC_FORMAT
    elif o in ("-h", "--help"):
        usage()
    elif o in ("-i", "--icicle"):
        icicle_file = a
    else:
        assert False, "unhandled option"

if os.geteuid() != 0:
    print "%s must be run as root" % (sys.argv[0])
    sys.exit(2)

if len(args) != 2:
    usage()

try:
    tdlfile = args[0]
    libvirt_xml_file = args[1]

    logging.basicConfig(level=loglevel, format=logformat)

    tdl = oz.TDL.TDL(open(tdlfile, 'r').read())

    config = ConfigParser.SafeConfigParser()
    if os.access(config_file, os.F_OK):
        config.read(config_file)

    guest = oz.GuestFactory.guest_factory(tdl, config, None)

    # Arbitrarily limit the size of the XML file that we will support to 5MB.
    # this should be plenty for a normal libvirt XML, and this should prevent us
    # from causing OOMs on bogus files
    if os.stat(libvirt_xml_file)[stat.ST_SIZE] > (5 * 1024 * 1024):
        raise Exception, "libvirt XML file is too big!"

    icicle_xml = guest.generate_icicle(open(libvirt_xml_file, 'r').read())
    if icicle_file is None:
        print icicle_xml
    else:
        open(icicle_file, 'w').write(icicle_xml)
        print "ICICLE XML was written to " + icicle_file
except Exception, exc:
    if loglevel > logging.DEBUG:
        print ""
        print "ERROR: %s" % (str(exc))
        print ""
        print "(use -d3 to get the full backtrace)"
        print ""
    else:
        raise