oz-customize

#!/usr/bin/env python

# Copyright (C) 2010,2011  Chris Lalancette <clalance@redhat.com>
# Copyright (C) 2012  Chris Lalancette <clalancette@gmail.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 oz.TDL
import oz.GuestFactory
import oz.ozutil

def usage():
    print("Usage: oz-customize [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(" Currently supported architectures are:")
    print("   i386, x86_64")
    print(" Currently supported operating systems are:")
    oz.GuestFactory.distrolist()
    sys.exit(1)

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

loglevel = logging.ERROR
logformat = "%(message)s"
config_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()
    else:
        assert False, "unhandled option"

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

try:
    config = oz.ozutil.parse_config(config_file)

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

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

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

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

    fp = open(libvirt_xml_file, 'r')

    # 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.fstat(fp.fileno())[stat.ST_SIZE] > (5 * 1024 * 1024):
        raise Exception("libvirt XML file is too big!")

    guest.customize(fp.read())
    fp.close()
except Exception as exc:
    if loglevel > logging.DEBUG:
        print("")
        print("ERROR: %s" % (str(exc)))
        print("")
        print("(use -d3 to get the full backtrace)")
        print("")
    else:
        raise