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#!/usr/bin/python
# Copyright (C) 2012-2014 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
'''A Morph deployment write extension for raw disk images.'''
import cliapp
import os
import sys
import time
import tempfile
import morphlib.writeexts
class RawDiskWriteExtension(morphlib.writeexts.WriteExtension):
'''Create a raw disk image during Morph's deployment.
If the image already exists, it is upgraded.
The location command line argument is the pathname of the disk image
to be created/upgraded.
'''
def process_args(self, args):
if len(args) != 2:
raise cliapp.AppException('Wrong number of command line args')
temp_root, location = args
if os.path.isfile(location):
self.upgrade_local_system(location, temp_root)
else:
try:
self.create_raw_disk_image(location)
self.create_local_system(temp_root, location)
self.status(msg='Disk image has been created at %s' % location)
except Exception:
self.status(msg='Failure to create disk image at %s' %
location)
if os.path.exists(location):
os.remove(location)
raise
def upgrade_local_system(self, raw_disk, temp_root):
self.complete_fstab_for_btrfs_layout(temp_root)
mp = self.mount(raw_disk)
version_label = self.get_version_label(mp)
self.status(msg='Updating image to a new version with label %s' %
version_label)
version_root = os.path.join(mp, 'systems', version_label)
os.mkdir(version_root)
old_orig = os.path.join(mp, 'systems', 'default', 'orig')
new_orig = os.path.join(version_root, 'orig')
cliapp.runcmd(
['btrfs', 'subvolume', 'snapshot', old_orig, new_orig])
cliapp.runcmd(
['rsync', '-a', '--checksum', '--numeric-ids', '--delete',
temp_root + os.path.sep, new_orig])
self.create_run(version_root)
default_path = os.path.join(mp, 'systems', 'default')
if os.path.exists(default_path):
os.remove(default_path)
else:
# we are upgrading and old system that does
# not have an updated extlinux config file
if self.bootloader_config_is_wanted():
self.generate_bootloader_config(mp)
self.install_bootloader(mp)
os.symlink(version_label, default_path)
if self.bootloader_config_is_wanted():
self.install_kernel(version_root, temp_root)
self.unmount(mp)
def get_version_label(self, mp):
version_label = os.environ.get('VERSION_LABEL')
if version_label is None:
self.unmount(mp)
raise cliapp.AppException('VERSION_LABEL was not given')
if os.path.exists(os.path.join(mp, 'systems', version_label)):
self.unmount(mp)
raise cliapp.AppException('VERSION_LABEL %s already exists'
% version_label)
return version_label
RawDiskWriteExtension().run()
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