Synnefo » snf-image-creator

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"""Module providing useful functions for the dialog-based version of

snf-image-creator.

"""

import os

from image_creator.output.dialog import GaugeOutput

from image_creator.util import MD5

SMALL_WIDTH = 60

WIDTH = 70

def update_background_title(session):

    """Update the backgroud title of the dialog page"""

    d = session['dialog']

    disk = session['disk']

    image = session['image']

    MB = 2 ** 20

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

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

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

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

            (image.ostype, image.distro, size, postfix,

             os.path.abspath(disk.source))

    d.setBackgroundTitle(title)

def confirm_exit(d, msg=''):

    """Ask the user to confirm when exiting the program"""

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

def confirm_reset(d):

    """Ask the user to confirm a reset action"""

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

                       width=SMALL_WIDTH, defaultno=1)

class Reset(Exception):

    """Exception used to reset the program"""

    pass

def extract_metadata_string(session):

    """Convert image metadata to text"""

    metadata = ['%s=%s' % (k, v) for (k, v) in session['metadata'].items()]

    if 'task_metadata' in session:

        metadata.extend("%s=yes" % m for m in session['task_metadata'])

    return '\n'.join(metadata) + '\n'

def extract_image(session):

    """Dump the image to a local file"""

    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:

            image = session['image']

            out = image.out

            out.add(gauge)

            try:

                if "checksum" not in session:

                    md5 = MD5(out)

                    session['checksum'] = md5.compute(image.device, image.size)

                # Extract image file

                image.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

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