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#!/usr/bin/python
# Copyright (C) 2012-2015 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/>.
'''A Morph deployment write extension for raw disk images.'''
import contextlib
import os
import pyfdisk
import re
import subprocess
import sys
import time
import tempfile
import writeexts
class RawDiskWriteExtension(writeexts.WriteExtension):
'''See rawdisk.write.help for documentation'''
def process_args(self, args):
if len(args) != 2:
raise writeexts.ExtensionError(
'Wrong number of command line args')
temp_root, location = args
upgrade = self.get_environment_boolean('UPGRADE')
if upgrade:
self.upgrade_local_system(location, temp_root)
else:
try:
if not self.is_device(location):
with self.created_disk_image(location):
self.create_baserock_system(temp_root, location)
self.status(msg='Disk image has been created at %s' %
location)
else:
self.create_baserock_system(temp_root, location)
self.status(msg='System deployed to %s' % location)
except Exception:
self.status(msg='Failure to deploy system to %s' %
location)
raise
def upgrade_local_system(self, location, temp_root):
self.complete_fstab_for_btrfs_layout(temp_root)
try:
with self.mount(location) as mp:
self.do_upgrade(mp, temp_root)
return
except subprocess.CalledProcessError:
pass
# At this point, we have failed to mount a raw image, so instead
# search for a Baserock root filesystem in the device's partitions
with self.find_and_mount_rootfs(location) as mp:
self.do_upgrade(mp, temp_root)
def do_upgrade(self, mp, temp_root):
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')
subprocess.check_call(
['btrfs', 'subvolume', 'snapshot', old_orig, new_orig])
subprocess.check_call(
['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)
def get_version_label(self, mp):
version_label = os.environ.get('VERSION_LABEL')
if version_label is None:
raise writeexts.ExtensionError('VERSION_LABEL was not given')
if os.path.exists(os.path.join(mp, 'systems', version_label)):
raise writeexts.ExtensionError('VERSION_LABEL %s already exists'
% version_label)
return version_label
RawDiskWriteExtension().run()
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