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#!/usr/bin/python
# Copyright (C) 2014-2015 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
'''Preparatory checks for Morph 'rawdisk' write extension'''
import os
import writeexts
class RawdiskCheckExtension(writeexts.WriteExtension):
def process_args(self, args):
if len(args) != 1:
raise writeexts.ExtensionError(
'Wrong number of command line args')
self.require_btrfs_in_deployment_host_kernel()
location = args[0]
upgrade = self.get_environment_boolean('UPGRADE')
if upgrade:
if not self.is_device(location):
if not os.path.isfile(location):
raise writeexts.ExtensionError(
'Cannot upgrade %s: it is not an existing disk image' %
location)
version_label = os.environ.get('VERSION_LABEL')
if version_label is None:
raise writeexts.ExtensionError(
'VERSION_LABEL was not given. It is required when '
'upgrading an existing system.')
else:
if not self.is_device(location):
if os.path.exists(location):
raise writeexts.ExtensionError(
'Target %s already exists. Use `morph upgrade` if you '
'want to update an existing image.' % location)
RawdiskCheckExtension().run()
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