Revision c408053f image_creator/main.py

b/image_creator/main.py
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# or implied, of GRNET S.A.
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from image_creator import get_os_class
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from image_creator import __version__ as version
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from image_creator.disk import Disk
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import sys
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import os
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import optparse
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from pbs import dd
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class FatalError(Exception):
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    pass
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def check_writable_dir(option, opt_str, value, parser):
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    if not os.path.isdir(value):
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        raise OptionValueError("%s is not a valid directory name" % value)
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    setattr(parser.values, option.dest, value)
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def parse_options(input_args):
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    usage = "Usage: %prog [options] <input_media> <name>"
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    parser = optparse.OptionParser(version=version, usage=usage)
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    parser.add_option("-o", "--outdir", type="string", dest="outdir",
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        default=".", action="callback", callback=check_writable_dir,
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        help="Output files to DIR [default: working dir]",
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        metavar="DIR")
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    parser.add_option("-f", "--force", dest="force", default=False,
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        action="store_true", help="Overwrite output files if they exist")
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    parser.add_option("--no-shrink", dest="shrink", default=True,
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        help="Don't shrink any partition before extracting the image",
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        action="store_false")
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    options, args = parser.parse_args(input_args)
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    if len(args) != 2:
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        parser.error('input media or name are missing')
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    options.source = args[0]
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    options.name = args[1]
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    if not os.path.exists(options.source):
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        parser.error('Input media is not accessible')
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    return options
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def main():
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    if len(sys.argv) != 3:
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        sys.exit("Usage: %s <source> <output_file>" %
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                        os.path.basename(sys.argv[0]))
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    source = sys.argv[1]
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    dest = sys.argv[2]
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    disk = Disk(source)
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    options = parse_options(sys.argv[1:])
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    if os.geteuid() != 0:
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        raise FatalError("You must run %s as root" \
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                        % os.path.basename(sys.argv[0]))
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    if not options.force:
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        for ext in ('diskdump', 'meta'):
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            filename = "%s/%s.%s" % (options.outdir, options.name, ext)
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            if os.path.exists(filename):
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                raise FatalError("Output file %s exists "
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                    "(use --force to overwrite it)." % filename)
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    disk = Disk(options.source)
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    try:
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        dev = disk.get_device()
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        dev.mount()
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        osclass = get_os_class(dev.distro, dev.ostype)
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        image_os = osclass(dev.root, dev.g)
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        metadata = image_os.get_metadata()
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        for key in metadata.keys():
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            print "%s=%s" % (key, metadata[key])
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        image_os.data_cleanup()
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        dev.umount()
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        #dev.shrink()
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        size = options.shrink and dev.shrink() or dev.size()
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        metadata['size'] = str(size // 2 ** 20)
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        dd('if=%s' % dev.device,
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            'of=%s/%s.%s' % (options.outdir, options.name, 'diskdump'),
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            'bs=4M', 'count=%d' % ((size + 1) // 2 ** 22))
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        f = open('%s/%s.%s' % (options.outdir, options.name, 'meta'), 'w')
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        for key in metadata.keys():
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            f.write("%s=%s\n" % (key, metadata[key]))
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        f.close()
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    finally:
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        disk.cleanup()
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    return 0
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COLOR_BLACK = "\033[00m"
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COLOR_RED = "\033[1;31m"
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if __name__ == '__main__':
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    main()
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    try:
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        ret = main()
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        sys.exit(ret)
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    except FatalError as e:
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        print >> sys.stderr, "\n%sError: %s%s\n" % (COLOR_RED, e, COLOR_BLACK)
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        sys.exit(1)
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# vim: set sta sts=4 shiftwidth=4 sw=4 et ai :

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