Synnefo » snf-image-creator

#!/usr/bin/env python

# Copyright 2012 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.

import os

SMALL_WIDTH = 60

WIDTH = 70

def update_background_title(session):

    d = session['dialog']

    dev = session['device']

    MB = 2 ** 20

    size = (dev.size + MB - 1) // MB

    shrinked = 'shrinked' in session and session['shrinked']

    postfix = " (shrinked)" if shrinked else ''

    title = "OS: %s, Distro: %s, Size: %dMB%s" % \

            (dev.ostype, dev.distro, size, postfix)

    d.setBackgroundTitle(title)

def confirm_exit(d, msg=''):

    return not d.yesno("%s Do you want to exit?" % msg, width=SMALL_WIDTH)

def confirm_reset(d):

    return not d.yesno("Are you sure you want to reset everything?",

                       width=SMALL_WIDTH, defaultno=1)

class Reset(Exception):

    pass

def extract_image(session):

    d = session['dialog']

    dir = os.getcwd()

    while 1:

        if dir and dir[-1] != os.sep:

            dir = dir + os.sep

        (code, path) = d.fselect(dir, 10, 50, title="Save image as...")

        if code in (d.DIALOG_CANCEL, d.DIALOG_ESC):

            return False

        if os.path.isdir(path):

            dir = path

            continue

        if os.path.isdir("%s.meta" % path):

            d.msgbox("Can't overwrite directory `%s.meta'" % path,

                     width=SMALL_WIDTH)

            continue

        if os.path.isdir("%s.md5sum" % path):

            d.msgbox("Can't overwrite directory `%s.md5sum'" % path,

                     width=SMALL_WIDTH)

            continue

        basedir = os.path.dirname(path)

        name = os.path.basename(path)

        if not os.path.exists(basedir):

            d.msgbox("Directory `%s' does not exist" % basedir,

                     width=SMALL_WIDTH)

            continue

        dir = basedir

        if len(name) == 0:

            continue

        files = ["%s%s" % (path, ext) for ext in ('', '.meta', '.md5sum')]

        overwrite = filter(os.path.exists, files)

        if len(overwrite) > 0:

            if d.yesno("The following file(s) exist:\n"

                       "%s\nDo you want to overwrite them?" %

                       "\n".join(overwrite), width=SMALL_WIDTH):

                continue

        gauge = GaugeOutput(d, "Image Extraction", "Extracting image...")

        try:

            dev = session['device']

            out = dev.out

            out.add(gauge)

            try:

                if "checksum" not in session:

                    size = dev.size

                    md5 = MD5(out)

                    session['checksum'] = md5.compute(session['snapshot'],

                                                      size)

                # Extract image file

                dev.dump(path)

                # Extract metadata file

                out.output("Extracting metadata file...")

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

                    f.write(extract_metadata_string(session))

                out.success('done')

                # Extract md5sum file

                out.output("Extracting md5sum file...")

                md5str = "%s %s\n" % (session['checksum'], name)

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

                    f.write(md5str)

                out.success("done")

            finally:

                out.remove(gauge)

        finally:

            gauge.cleanup()

        d.msgbox("Image file `%s' was successfully extracted!" % path,

                 width=SMALL_WIDTH)

        break

    return True

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