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#!/usr/bin/python
# Copyright (C) 2013-2014 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 upgrading systems over ssh.'''
import contextlib
import cliapp
import os
import sys
import time
import tempfile
import morphlib.writeexts
def ssh_runcmd_ignore_failure(location, command, **kwargs):
try:
return cliapp.ssh_runcmd(location, command, **kwargs)
except cliapp.AppException:
pass
class SshRsyncWriteExtension(morphlib.writeexts.WriteExtension):
'''Upgrade a running baserock system with ssh and rsync.
It assumes the system is baserock-based and has a btrfs partition.
The location command line argument is the 'user@hostname' string
that will be passed to ssh and rsync
'''
def find_root_disk(self, location):
'''Read /proc/mounts on location to find which device contains "/"'''
self.status(msg='Finding device that contains "/"')
contents = cliapp.ssh_runcmd(location, ['cat', '/proc/mounts'])
for line in contents.splitlines():
line_words = line.split()
if (line_words[1] == '/' and line_words[0] != 'rootfs'):
return line_words[0]
@contextlib.contextmanager
def _remote_mount_point(self, location):
self.status(msg='Creating remote mount point')
remote_mnt = cliapp.ssh_runcmd(location, ['mktemp', '-d']).strip()
try:
yield remote_mnt
finally:
self.status(msg='Removing remote mount point')
cliapp.ssh_runcmd(location, ['rmdir', remote_mnt])
@contextlib.contextmanager
def _remote_mount(self, location, root_disk, mountpoint):
self.status(msg='Mounting root disk')
cliapp.ssh_runcmd(location, ['mount', root_disk, mountpoint])
try:
yield
finally:
self.status(msg='Unmounting root disk')
cliapp.ssh_runcmd(location, ['umount', mountpoint])
@contextlib.contextmanager
def _created_version_root(self, location, remote_mnt, version_label):
version_root = os.path.join(remote_mnt, 'systems', version_label)
self.status(msg='Creating %(root)s', root=version_root)
cliapp.ssh_runcmd(location, ['mkdir', version_root])
try:
yield version_root
except BaseException as e:
# catch all, we always want to clean up
self.status(msg='Cleaning up %(root)s', root=version_root)
ssh_runcmd_ignore_failure(location, ['rmdir', version_root])
def get_old_orig(self, location, remote_mnt):
'''Identify which subvolume to snapshot from'''
# rawdisk upgrades use 'factory'
return os.path.join(remote_mnt, 'systems', 'factory', 'orig')
@contextlib.contextmanager
def _created_orig_subvolume(self, location, remote_mnt, version_root):
self.status(msg='Creating "orig" subvolume')
old_orig = self.get_old_orig(location, remote_mnt)
new_orig = os.path.join(version_root, 'orig')
cliapp.ssh_runcmd(location, ['btrfs', 'subvolume', 'snapshot',
old_orig, new_orig])
try:
yield new_orig
except BaseException as e:
ssh_runcmd_ignore_failure(
location, ['btrfs', 'subvolume', 'delete', new_orig])
def populate_remote_orig(self, location, new_orig, temp_root):
'''Populate the subvolume version_root/orig on location'''
self.status(msg='Populating "orig" subvolume')
cliapp.runcmd(['rsync', '-as', '--checksum', '--numeric-ids',
'--delete', temp_root + os.path.sep,
'%s:%s' % (location, new_orig)])
@contextlib.contextmanager
def _deployed_version(self, location, version_label,
system_config_sync, system_version_manager):
self.status(msg='Calling system-version-manager to deploy upgrade')
deployment = os.path.join('/systems', version_label, 'orig')
cliapp.ssh_runcmd(location,
['env', 'BASEROCK_SYSTEM_CONFIG_SYNC='+system_config_sync,
system_version_manager, 'deploy', deployment])
try:
yield deployment
except BaseException as e:
self.status(msg='Cleaning up failed version installation')
cliapp.ssh_runcmd(location,
[system_version_manager, 'remove', version_label])
def upgrade_remote_system(self, location, temp_root):
root_disk = self.find_root_disk(location)
uuid = cliapp.ssh_runcmd(location, ['blkid', '-s', 'UUID', '-o',
'value', root_disk]).strip()
self.complete_fstab_for_btrfs_layout(temp_root, uuid)
version_label = os.environ['VERSION_LABEL']
autostart = self.get_environment_boolean('AUTOSTART')
with self._remote_mount_point(location) as remote_mnt, \
self._remote_mount(location, root_disk, remote_mnt), \
self._created_version_root(location, remote_mnt,
version_label) as version_root, \
self._created_orig_subvolume(location, remote_mnt,
version_root) as orig:
self.populate_remote_orig(location, orig, temp_root)
system_config_sync = os.path.join(
remote_mnt, 'systems', version_label, 'orig',
'usr', 'bin', 'baserock-system-config-sync')
system_version_manager = os.path.join(
remote_mnt, 'systems', version_label, 'orig',
'usr', 'bin', 'system-version-manager')
with self._deployed_version(location, version_label,
system_config_sync, system_version_manager):
self.status(msg='Setting %(v)s as the new default system',
v=version_label)
cliapp.ssh_runcmd(location, [system_version_manager,
'set-default', version_label])
if autostart:
self.status(msg="Rebooting into new system ...")
ssh_runcmd_ignore_failure(location, ['reboot'])
def process_args(self, args):
if len(args) != 2:
raise cliapp.AppException('Wrong number of command line args')
temp_root, location = args
self.upgrade_remote_system(location, temp_root)
SshRsyncWriteExtension().run()
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