Synnefo » snf-image-creator

#!/usr/bin/env python

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from image_creator import __version__ as version

from image_creator.disk import Disk

from image_creator.util import FatalError, MD5

from image_creator.output.cli import SilentOutput, SimpleOutput, \

    OutputWthProgress

from image_creator.kamaki_wrapper import Kamaki, ClientError

import sys

import os

import optparse

import StringIO

import signal

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)

    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="output only 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 with ~okeanos as IMAGENAME",

                      metavar="IMAGENAME")

    parser.add_option("-m", "--metadata", dest="metadata", default=[],

                      help="add custom KEY=VALUE metadata to the image",

                      action="append", metavar="KEY=VALUE")

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

                      default=None, help="use this authentication token when "

                      "uploading/registering images")

    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 any system preparation operation",

                      action="store_false")

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

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

    parser.add_option("--public", dest="public", default=False,

                      help="register image with cyclades as public",

                      action="store_true")

    parser.add_option("--tmpdir", dest="tmp", type="string", default=None,

                      help="create large temporary image files under DIR",

                      metavar="DIR")

    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 not options.upload:

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

    if options.upload and options.token is None:

        raise FatalError(

            "Image uploading cannot be performed. "

            "No authentication token is specified. Use -t to set a token")

    if options.tmp is not None and not os.path.isdir(options.tmp):

        raise FatalError("The directory `%s' specified with --tmpdir is not "

                         "valid" % options.tmp)

    meta = {}

    for m in options.metadata:

        try:

            key, value = m.split('=', 1)

        except ValueError:

            raise FatalError("Metadata option: `%s' is not in KEY=VALUE "

                             "format." % m)

        meta[key] = value

    options.metadata = meta

    return options

def image_creator():

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

    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")

    if options.silent:

        out = SilentOutput()

    else:

        out = OutputWthProgress(True) if sys.stderr.isatty() else \

            SimpleOutput(False)

    title = 'snf-image-creator %s' % version

    out.output(title)

    out.output('=' * len(title))

    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', '.md5sum'):

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

            if os.path.exists(filename):

                raise FatalError("Output file %s exists "

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

    # Check if the authentication token is valid. The earlier the better

    if options.token is not None:

        try:

            account = Kamaki.get_account(options.token)

            if account is None:

                raise FatalError("The authentication token you provided is not"

                                 " valid!")

        except ClientError as e:

            raise FatalError("Astakos client: %d %s" % (e.status, e.message))

    disk = Disk(options.source, out, options.tmp)

    def signal_handler(signum, frame):

        disk.cleanup()

    signal.signal(signal.SIGINT, signal_handler)

    signal.signal(signal.SIGTERM, signal_handler)

    try:

        snapshot = disk.snapshot()

        image = disk.get_image(snapshot)

        # If no customization is to be done, the image should be mounted ro

        ro = (not (options.sysprep or options.shrink) or options.print_sysprep)

        image.mount(ro)

        try:

            for sysprep in options.disabled_syspreps:

                image.os.disable_sysprep(image.os.get_sysprep_by_name(sysprep))

            for sysprep in options.enabled_syspreps:

                image.os.enable_sysprep(image.os.get_sysprep_by_name(sysprep))

            if options.print_sysprep:

                image.os.print_syspreps()

                out.output()

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

                return 0

            if options.sysprep:

                err_msg = "Unable to perform the system preparation tasks. " \

                    "Couldn't mount the media%s. Use --no-sysprep if you " \

                    "don't won't to perform any system preparation task."

                if not image.mounted:

                    raise FatalError(err_msg % "")

                elif image.mounted_ro:

                    raise FatalError(err_msg % " read-write")

                image.os.do_sysprep()

            metadata = image.os.meta

        finally:

            image.umount()

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

        metadata.update(image.meta)

        # Add command line metadata to the collected ones...

        metadata.update(options.metadata)

        md5 = MD5(out)

        checksum = md5.compute(image.device, size)

        metastring = '\n'.join(

            ['%s=%s' % (key, value) for (key, value) in metadata.items()])

        metastring += '\n'

        if options.outfile is not None:

            image.dump(options.outfile)

            out.output('Dumping metadata file ...', False)

            with open('%s.%s' % (options.outfile, 'meta'), 'w') as f:

                f.write(metastring)

            out.success('done')

            out.output('Dumping md5sum file ...', False)

            with open('%s.%s' % (options.outfile, 'md5sum'), 'w') as f:

                f.write('%s %s\n' % (checksum,

                                     os.path.basename(options.outfile)))

            out.success('done')

        # Destroy the image instance. We only need the snapshot from now on

        disk.destroy_image(image)

        out.output()

        try:

            uploaded_obj = ""

            if options.upload:

                out.output("Uploading image to pithos:")

                kamaki = Kamaki(account, out)

                with open(snapshot, 'rb') as f:

                    uploaded_obj = kamaki.upload(

                        f, size, options.upload,

                        "(1/4)  Calculating block hashes",

                        "(2/4)  Uploading missing blocks")

                out.output("(3/4)  Uploading metadata file ...", False)

                kamaki.upload(StringIO.StringIO(metastring),

                              size=len(metastring),

                              remote_path="%s.%s" % (options.upload, 'meta'))

                out.success('done')

                out.output("(4/4)  Uploading md5sum file ...", False)

                md5sumstr = '%s %s\n' % (checksum,

                                         os.path.basename(options.upload))

                kamaki.upload(StringIO.StringIO(md5sumstr),

                              size=len(md5sumstr),

                              remote_path="%s.%s" % (options.upload, 'md5sum'))

                out.success('done')

                out.output()

            if options.register:

                img_type = 'public' if options.public else 'private'

                out.output('Registering %s image with ~okeanos ...' % img_type,

                           False)

                kamaki.register(options.register, uploaded_obj, metadata,

                                options.public)

                out.success('done')

                out.output()

        except ClientError as e:

            raise FatalError("Pithos client: %d %s" % (e.status, e.message))

    finally:

        out.output('cleaning up ...')

        disk.cleanup()

    out.success("snf-image-creator exited without errors")

    return 0

def main():

    try:

        ret = image_creator()

        sys.exit(ret)

    except FatalError as e:

        colored = sys.stderr.isatty()

        SimpleOutput(colored).error(e)

        sys.exit(1)

if __name__ == '__main__':

    main()

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