Synnefo » snf-image-creator

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

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from image_creator.util import output, FatalError

import textwrap

import re

def get_os_class(distro, osfamily):

    module = None

    classname = None

    try:

        module = __import__("image_creator.os_type.%s"

            % distro, fromlist=['image_creator.os_type'])

        classname = distro.capitalize()

    except ImportError:

        module = __import__("image_creator.os_type.%s"

            % osfamily, fromlist=['image_creator.os_type'])

        classname = osfamily.capitalize()

    return getattr(module, classname)

def add_prefix(target):

    def wrapper(self, *args):

        prefix = args[0]

        return map(lambda x: prefix + x, target(self, *args))

    return wrapper

def sysprep(enabled=True):

    def wrapper(func):

        func.sysprep = True

        func.enabled = enabled

        return func

    return wrapper

class OSBase(object):

    """Basic operating system class"""

    def __init__(self, rootdev, ghandler):

        self.root = rootdev

        self.g = ghandler

    def _is_sysprep(self, obj):

        return getattr(obj, 'sysprep', False) and callable(obj)

    def list_syspreps(self):

        objs = [getattr(self, name) for name in dir(self) \

            if not name.startswith('_')]

        enabled = [x for x in objs if self._is_sysprep(x) and x.enabled]

        disabled = [x for x in objs if self._is_sysprep(x) and not x.enabled]

        return enabled, disabled

    def _sysprep_change_status(self, name, status):

        error_msg = "Syprep operation %s does not exist for %s" % \

                (name, self.__class__.__name__)

        method_name = name.replace('-', '_')

        method = None

        try:

            method = getattr(self, method_name)

        except AttributeError:

            raise FatalError(error_msg)

        if not self._is_sysprep(method):

            raise FatalError(error_msg)

        setattr(method.im_func, 'enabled', status)

    def enable_sysprep(self, name):

        """Enable a system preperation operation"""

        self._sysprep_change_status(name, True)

    def disable_sysprep(self, name):

        """Disable a system preperation operation"""

        self._sysprep_change_status(name, False)

    def print_syspreps(self):

        """Print enabled and disabled system preperation operations."""

        enabled, disabled = self.list_syspreps()

        wrapper = textwrap.TextWrapper()

        wrapper.subsequent_indent = '\t'

        wrapper.initial_indent = '\t'

        output("Enabled system preperation operations:")

        if len(enabled) == 0:

            output("(none)")

        else:

            for sysprep in enabled:

                name = sysprep.__name__.replace('_', '-')

                descr = wrapper.fill(sysprep.__doc__)

                output('    %s:\n%s\n' % (name, descr))

        output("Disabled system preperation operations:")

        if len(disabled) == 0:

            output("(none)")

        else:

            for sysprep in disabled:

                name = sysprep.__name__.replace('_', '-')

                descr = wrapper.fill(sysprep.__doc__)

                output('    %s:\n%s\n' % (name, descr))

    @add_prefix

    def ls(self, directory):

        """List the name of all files under a directory"""

        return self.g.ls(directory)

    @add_prefix

    def find(self, directory):

        """List the name of all files recursively under a directory"""

        return self.g.find(directory)

    def foreach_file(self, directory, action, **kargs):

        """Perform an action recursively on all files under a directory.

        The following options are allowed:

        * maxdepth: If defined the action will not be performed on

          files that are below this level of directories under the

          directory parameter.

        * ftype: The action will only be performed on files of this

          type. For a list of all allowed filetypes, see here:

          http://libguestfs.org/guestfs.3.html#guestfs_readdir

        * exclude: Exclude all files that follow this pattern.

        """

        maxdepth = None if 'maxdepth' not in kargs else kargs['maxdepth']

        if maxdepth == 0:

            return

        # maxdepth -= 1

        maxdepth = None if maxdepth is None else maxdepth - 1

        kargs['maxdepth'] = maxdepth

        exclude = None if 'exclude' not in kargs else kargs['exclude']

        ftype = None if 'ftype' not in kargs else kargs['ftype']

        has_ftype = lambda x, y: y is None and True or x['ftyp'] == y

        for f in self.g.readdir(directory):

            if f['name'] in ('.', '..'):

                continue

            full_path = "%s/%s" % (directory, f['name'])

            if exclude and re.match(exclude, full_path):

                continue

            if has_ftype(f, 'd'):

                self.foreach_file(full_path, action, **kargs)

            if has_ftype(f, ftype):

                action(full_path)

    def get_metadata(self):

        """Returns some descriptive metadata about the OS."""

        meta = {}

        meta['ROOT_PARTITION'] = "%d" % self.g.part_to_partnum(self.root)

        meta['OSFAMILY'] = self.g.inspect_get_type(self.root)

        meta['OS'] = self.g.inspect_get_distro(self.root)

        meta['DESCRIPTION'] = self.g.inspect_get_product_name(self.root)

        return meta

    def do_sysprep(self):

        """Prepere system for image creation."""

        output('Preparing system for image creation:')

        tasks, _ = self.list_syspreps()

        size = len(tasks)

        cnt = 0

        for task in tasks:

            cnt += 1

            output(('(%d/%d)' % (cnt, size)).ljust(7), False)

            task()

        output()

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