Synnefo » snf-image-creator

#!/usr/bin/env python

# Copyright 2012 GRNET S.A. All rights reserved.

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import dialog

import time

import StringIO

from image_creator.kamaki_wrapper import Kamaki, ClientError

from image_creator.util import MD5, FatalError

from image_creator.output.cli import OutputWthProgress

PAGE_WIDTH = 70

class WizardExit(Exception):

    pass

class Wizard:

    def __init__(self, session):

        self.session = session

        self.pages = []

        self.session['wizard'] = {}

    def add_page(self, page):

        self.pages.append(page)

    def run(self):

        idx = 0

        while True:

            try:

                idx += self.pages[idx].run(self.session, idx, len(self.pages))

            except WizardExit:

                return False

            if idx >= len(self.pages):

                break

            if idx < 0:

                return False

        return True

class WizardPage:

    NEXT = 1

    PREV = -1

    def run(self, session, index, total):

        raise NotImplementedError

class WizardInputPage(WizardPage):

    def __init__(self, name, message, **kargs):

        self.name = name

        self.message = message

        self.title = kargs['title'] if 'title' in kargs else ''

        self.init_value = kargs['init'] if 'init' in kargs else ''

        self.allow_empty = kargs['empty'] if 'empty' in kargs else False

    def run(self, session, index, total):

        d = session['dialog']

        w = session['wizard']

        init = w[self.name] if self.name in w else self.init_value

        while True:

            (code, answer) = d.inputbox(self.message, init=init,

                width=PAGE_WIDTH, ok_label="Next", cancel="Back",

                title="(%d/%d) %s" % (index + 1, total, self.title))

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

                return self.PREV

            value = answer.strip()

            if len(value) == 0 and self.allow_empty is False:

                d.msgbox("The value cannot be empty!", width=PAGE_WIDTH)

                continue

            w[self.name] = value

            break

        return self.NEXT

class WizardYesNoPage(WizardPage):

    def __init__(self, message, **kargs):

        self.message = message

        self.title = kargs['title'] if 'title' in kargs else ''

    def run(self, session, index, total):

        d = session['dialog']

        while True:

            ret = d.yesno(self.message, width=PAGE_WIDTH, ok_label="Yes",

                    cancel="Back", extra_button=1, extra_label="Quit",

                    title="(%d/%d) %s" % (index + 1, total, self.title))

            if ret == d.DIALOG_CANCEL:

                return self.PREV

            elif ret == d.DIALOG_EXTRA:

                raise WizardExit

            elif ret == d.DIALOG_OK:

                return self.NEXT

def wizard(session):

    name = WizardInputPage("ImageName", "Please provide a name for the image:",

                      title="Image Name", init=session['device'].distro)

    descr = WizardInputPage("ImageDescription",

        "Please provide a description for the image:",

        title="Image Description", empty=True,

        init=session['metadata']['DESCRIPTION'] if 'DESCRIPTION' in

        session['metadata'] else '')

    account = WizardInputPage("account",

        "Please provide your ~okeanos account e-mail:",

        title="~okeanos account information", init=Kamaki.get_account())

    token = WizardInputPage("token",

        "Please provide your ~okeanos account token:",

        title="~okeanos account token", init=Kamaki.get_token())

    msg = "Do you wish to continue with the image extraction process?"

    proceed = WizardYesNoPage(msg, title="Confirmation")

    w = Wizard(session)

    w.add_page(name)

    w.add_page(descr)

    w.add_page(account)

    w.add_page(token)

    w.add_page(proceed)

    if w.run():

        extract_image(session)

    else:

        return False

    return True

def extract_image(session):

    disk = session['disk']

    device = session['device']

    snapshot = session['snapshot']

    image_os = session['image_os']

    wizard = session['wizard']

    out = OutputWthProgress(True)

    #Initialize the output

    disk.out = out

    device.out = out

    image_os.out = out

    out.clear()

    #Sysprep

    device.mount(False)

    image_os.do_sysprep()

    metadata = image_os.meta

    device.umount()

    #Shrink

    size = device.shrink()

    metadata.update(device.meta)

    metadata['DESCRIPTION'] = wizard['ImageDescription']

    #MD5

    md5 = MD5(out)

    checksum = md5.compute(snapshot, size)

    #Metadata

    metastring = '\n'.join(

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

    metastring += '\n'

    out.output()

    try:

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

        kamaki = Kamaki(wizard['account'], wizard['token'], out)

        name = "%s-%s.diskdump" % (wizard['ImageName'],

                                   time.strftime("%Y%m%d%H%M"))

        pithos_file = ""

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

            pithos_file = kamaki.upload(f, size, name,

                                         "(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" % (name, 'meta'))

        out.success('done')

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

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

        kamaki.upload(StringIO.StringIO(md5sumstr), size=len(md5sumstr),

                      remote_path="%s.%s" % (name, 'md5sum'))

        out.success('done')

        out.output()

        out.output('Registring image to ~okeanos...', False)

        kamaki.register(wizard['ImageName'], pithos_file, metadata)

        out.success('done')

        out.output()

    except ClientError as e:

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

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