Synnefo » snf-image-creator

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

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from image_creator import get_os_class

from image_creator import __version__ as version

from image_creator.disk import Disk

import sys

import os

import optparse

from pbs import dd

class FatalError(Exception):

    pass

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

    if not os.path.isdir(value):

        raise OptionValueError("%s is not a valid directory name" % value)

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

def parse_options(input_args):

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

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

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

        default=".", action="callback", callback=check_writable_dir,

        help="Output files to DIR [default: working dir]",

        metavar="DIR")

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

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

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

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

        action="store_false")

    options, args = parser.parse_args(input_args)

    if len(args) != 2:

        parser.error('input media or name are missing')

    options.source = args[0]

    options.name = args[1]

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

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

    return options

def main():

    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 ext in ('diskdump', 'meta'):

            filename = "%s/%s.%s" % (options.outdir, options.name, ext)

            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()

        image_os.data_cleanup()

        dev.umount()

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

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

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

            'of=%s/%s.%s' % (options.outdir, options.name, 'diskdump'),

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

        f = open('%s/%s.%s' % (options.outdir, options.name, 'meta'), 'w')

        for key in metadata.keys():

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

        f.close()

    finally:

        disk.cleanup()

    return 0

COLOR_BLACK = "\033[00m"

COLOR_RED = "\033[1;31m"

if __name__ == '__main__':

    try:

        ret = main()

        sys.exit(ret)

    except FatalError as e:

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

        sys.exit(1)

# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :