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 util

from image_creator.disk import Disk

from image_creator.util import get_command, error, success, output, FatalError

from image_creator.kamaki_wrapper import Kamaki

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):

        raise FatalError("`%s' is not an existing directory" % dirname)

    if not name:

        raise FatalError("`%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)

    account = os.environ["OKEANOS_USER"] if "OKEANOS_USER" in os.environ \

        else None

    token = os.environ["OKEANOS_TOKEN"] if "OKEANOS_TOKEN" in os.environ \

        else None

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

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

        help="dump image to FILE", metavar="FILE")

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

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

    parser.add_option("-s", "--silent", dest="silent", default=False,

        help="silent mode, only output errors", action="store_true")

    parser.add_option("-u", "--upload", dest="upload", type="string",

        default=False, help="upload the image to pithos with name FILENAME",

        metavar="FILENAME")

    parser.add_option("-r", "--register", dest="register", type="string",

        default=False, help="register the image to ~okeanos as IMAGENAME",

        metavar="IMAGENAME")

    parser.add_option("-a", "--account", dest="account", type="string",

        default=account,

        help="Use this ACCOUNT when uploading/registring images [Default: %s]"\

        % account)

    parser.add_option("-t", "--token", dest="token", type="string",

        default=token,

        help="Use this token when uploading/registring images [Default: %s]"\

        % token)

    parser.add_option("--print-sysprep", dest="print_sysprep", default=False,

        help="print the enabled and disabled system preparation operations "

        "for this input media", action="store_true")

    parser.add_option("--enable-sysprep", dest="enabled_syspreps", default=[],

        help="run SYSPREP operation on the input media",

        action="append", metavar="SYSPREP")

    parser.add_option("--disable-sysprep", dest="disabled_syspreps",

        help="prevent SYSPREP operation from running on the input media",

        default=[], action="append", metavar="SYSPREP")

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

        help="don't perform system preperation", action="store_false")

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

        help="don't shrink any partition", action="store_false")

    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):

        raise FatalError("Input media `%s' is not accessible" % options.source)

    if options.register and options.upload == False:

        raise FatalError("You also need to set -u when -r option is set")

    if options.upload and options.account is None:

        raise FatalError("Image uploading cannot be performed. No ~okeanos "

        "account name is specified. Use -a to set an account name.")

    if options.upload and options.token is None:

        raise FatalError("Image uploading cannot be performed. No ~okeanos "

        "token is specified. User -t to set a token.")

    return options

def image_creator():

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

    if options.silent:

        util.silent = True

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

                                            and not options.print_sysprep:

        raise FatalError("At least one of `-o', `-u' or" \

                            "`--print-sysprep' must be set")

    output('snf-image-creator %s\n' % version)

    if os.geteuid() != 0:

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

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

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

        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:

        snapshot = disk.snapshot()

        dev = disk.get_device(snapshot)

        dev.mount()

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

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

        metadata = image_os.get_metadata()

        output()

        for sysprep in options.disabled_syspreps:

            image_os.disable_sysprep(sysprep)

        for sysprep in options.enabled_syspreps:

            image_os.enable_sysprep(sysprep)

        if options.print_sysprep:

            image_os.print_syspreps()

            output()

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

            return 0

        if options.sysprep:

            image_os.do_sysprep()

        dev.umount()

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

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

        if options.outfile is not None:

            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()

            dev.dump(options.outfile)

        # Destroy the device. We only need the snapshot from now on

        disk.destroy_device(dev)

        if options.upload:

            output("Uploading image to pithos...", False)

            kamaki = Kamaki(options.account, options.token)

            kamaki.upload(snapshot, size, options.upload)

            output("done")

    finally:

        output('cleaning up...')

        disk.cleanup()

    return 0

def main():

    try:

        ret = image_creator()

        sys.exit(ret)

    except FatalError as e:

        error(e)

        sys.exit(1)

if __name__ == '__main__':

    main()

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