Synnefo » snf-image-creator

#!/usr/bin/env python

# Copyright 2011 GRNET S.A. All rights reserved.

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from image_creator import get_os_class

from image_creator import __version__ as version

from image_creator import FatalError

from image_creator.disk import Disk

from image_creator.util import get_command

import sys

import os

import optparse

dd = get_command('dd')

def check_writable_dir(option, opt_str, value, parser):

    dirname = os.path.dirname(value)

    name = os.path.basename(value)

    if dirname and not os.path.isdir(dirname):

        parser.error("`%s' is not an existing directory" % dirname)

    if not name:

        parser.error("`%s' is not a valid file name" % dirname)

    setattr(parser.values, option.dest, value)

def parse_options(input_args):

    usage = "Usage: %prog [options] <input_media>"

    parser = optparse.OptionParser(version=version, usage=usage)

    parser.add_option("-f", "--force", dest="force", default=False,

        action="store_true", help="Overwrite output files if they exist")

    parser.add_option("--no-cleanup", dest="cleanup", default=True,

        help="Don't cleanup sensitive data before extracting the image",

        action="store_false")

    parser.add_option("--no-sysprep", dest="sysprep", default=True,

        help="Don't perform system preperation before extracting the image",

        action="store_false")

    parser.add_option("--no-shrink", dest="shrink", default=True,

        help="Don't shrink any partition before extracting the image",

        action="store_false")

    parser.add_option("-o", "--outfile", type="string", dest="outfile",

        default=None, action="callback", callback=check_writable_dir,

        help="Output image file",

        metavar="FILE")

    parser.add_option("-u", "--upload", dest="upload", default=False,

        help="Upload image to a pithos repository using kamaki",

        action="store_true")

    parser.add_option("-r", "--register", dest="register", default=False,

        help="Register image to okeanos using kamaki", action="store_true")

    options, args = parser.parse_args(input_args)

    if len(args) != 1:

        parser.error('Wrong number of arguments')

    options.source = args[0]

    if not os.path.exists(options.source):

        parser.error('input media is not accessible')

    if options.register:

        options.upload = True

    if options.outfile is None and not options.upload:

        parser.error('either outfile (-o) or upload (-u) must be set.')

    return options

def image_creator():

    options = parse_options(sys.argv[1:])

    if os.geteuid() != 0:

        raise FatalError("You must run %s as root" \

                        % os.path.basename(sys.argv[0]))

    if not options.force:

        for extension in ('', '.meta'):

            filename = "%s%s" % (options.outfile, extension)

            if os.path.exists(filename):

                raise FatalError("Output file %s exists "

                    "(use --force to overwrite it)." % filename)

    disk = Disk(options.source)

    try:

        dev = disk.get_device()

        dev.mount()

        osclass = get_os_class(dev.distro, dev.ostype)

        image_os = osclass(dev.root, dev.g)

        metadata = image_os.get_metadata()

        if options.sysprep:

            image_os.sysprep()

        if options.cleanup:

            image_os.data_cleanup()

        dev.umount()

        size = options.shrink and dev.shrink() or dev.size()

        metadata['size'] = str(size // 2 ** 20)

        outfile = ""

        if options.outfile is not None:

            outfile = options.outfile

            f = open('%s.%s' % (options.outfile, 'meta'), 'w')

            try:

                for key in metadata.keys():

                    f.write("%s=%s\n" % (key, metadata[key]))

            finally:

                f.close()

        else:

            outfd, outfile = tmpfile.mkstemp()

            os.close(outfd)

        dd('if=%s' % dev.device,

            'of=%s' % outfile,

            'bs=4M', 'count=%d' % ((size + 1) // 2 ** 22))

    finally:

        disk.cleanup()

    #The image is ready, lets call kamaki if necessary

    if options.upload:

        pass

    if options.outfile is None:

        os.unlink(outfile)

    return 0

COLOR_BLACK = "\033[00m"

COLOR_RED = "\033[1;31m"

def main():

    try:

        ret = image_creator()

        sys.exit(ret)

    except FatalError as e:

        print >> sys.stderr, "\n%sError: %s%s\n" % (COLOR_RED, e, COLOR_BLACK)

        sys.exit(1)

if __name__ == '__main__':

    main()

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