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#!/usr/bin/python
# Copyright (C) 2013 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 cliapp
import os
import sys
import time
import tempfile
import morphlib.writeexts
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 process_args(self, args):
if len(args) != 2:
raise cliapp.AppException('Wrong number of command line args')
temp_root, location = args
self.check_valid_target(location)
self.upgrade_remote_system(location, temp_root)
def upgrade_remote_system(self, location, temp_root):
root_disk = self.find_root_disk(location)
version_label = os.environ.get('VERSION_LABEL')
self.status(msg='Creating remote mount point')
remote_mnt = cliapp.ssh_runcmd(location, ['mktemp', '-d']).strip()
try:
self.status(msg='Mounting root disk')
cliapp.ssh_runcmd(location, ['mount', root_disk, remote_mnt])
except Exception as e:
try:
cliapp.ssh_runcmd(location, ['rmdir', remote_mnt])
except:
pass
raise e
try:
version_root = os.path.join(remote_mnt, 'systems', version_label)
run_dir = os.path.join(version_root, 'run')
orig_dir = os.path.join(version_root, 'orig')
self.status(msg='Creating %s' % version_root)
cliapp.ssh_runcmd(location, ['mkdir', version_root])
self.create_remote_orig(location, version_root, remote_mnt,
temp_root)
self.status(msg='Creating "run" subvolume')
cliapp.ssh_runcmd(location, ['btrfs', 'subvolume',
'snapshot', orig_dir, run_dir])
self.status(msg='Updating system configuration')
bscs_loc = os.path.join(run_dir, 'usr', 'bin',
'baserock-system-config-sync')
output = cliapp.ssh_runcmd(location, ['sh', '-c',
'"$1" merge "$2" &> /dev/null || echo -n cmdfailed',
'-', bscs_loc, version_label])
if output == "cmdfailed":
self.status(msg='Updating system configuration failed')
self.install_remote_kernel(location, version_root, temp_root)
default_path = os.path.join(remote_mnt, 'systems', 'default')
if self.bootloader_is_wanted():
output = cliapp.ssh_runcmd(location, ['sh', '-c',
'test -e "$1" && stat -c %F "$1" '
'|| echo missing file',
'-', default_path])
if output != "symbolic link":
# we are upgrading and old system that does
# not have an updated extlinux config file
self.update_remote_extlinux(location, remote_mnt,
version_label)
cliapp.ssh_runcmd(location, ['ln', '-sfn', version_label,
default_path])
except Exception as e:
try:
cliapp.ssh_runcmd(location,
['btrfs', 'subvolume', 'delete', run_dir])
except:
pass
try:
cliapp.ssh_runcmd(location,
['btrfs', 'subvolume', 'delete', orig_dir])
except:
pass
try:
cliapp.ssh_runcmd(location, ['rm', '-rf', version_root])
except:
pass
raise e
finally:
self.status(msg='Removing temporary mounts')
cliapp.ssh_runcmd(location, ['umount', remote_mnt])
cliapp.ssh_runcmd(location, ['rmdir', remote_mnt])
def update_remote_extlinux(self, location, remote_mnt, version_label):
'''Install/reconfigure extlinux on location'''
self.status(msg='Creating extlinux.conf')
config = os.path.join(remote_mnt, 'extlinux.conf')
temp_fd, temp_path = tempfile.mkstemp()
with os.fdopen(temp_fd, 'w') as f:
f.write('default linux\n')
f.write('timeout 1\n')
f.write('label linux\n')
f.write('kernel /systems/default/kernel\n')
f.write('append root=/dev/sda '
'rootflags=subvol=systems/default/run '
'init=/sbin/init rw\n')
try:
cliapp.runcmd(['rsync', '-as', temp_path,
'%s:%s~' % (location, config)])
cliapp.ssh_runcmd(location, ['mv', config+'~', config])
except Exception as e:
try:
cliapp.ssh_runcmd(location, ['rm', '-f', config+'~'])
except:
pass
raise e
def create_remote_orig(self, location, version_root, remote_mnt,
temp_root):
'''Create the subvolume version_root/orig on location'''
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])
cliapp.runcmd(['rsync', '-as', '--checksum', '--numeric-ids',
'--delete', temp_root + os.path.sep,
'%s:%s' % (location, new_orig)])
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')
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]
def install_remote_kernel(self, location, version_root, temp_root):
'''Install the kernel in temp_root inside version_root on location'''
self.status(msg='Installing kernel')
image_names = ('vmlinuz', 'zImage', 'uImage')
kernel_dest = os.path.join(version_root, 'kernel')
for name in image_names:
try_path = os.path.join(temp_root, 'boot', name)
if os.path.exists(try_path):
cliapp.runcmd(['rsync', '-as', try_path,
'%s:%s' % (location, kernel_dest)])
def check_valid_target(self, location):
try:
cliapp.ssh_runcmd(location, ['true'])
except Exception as e:
raise cliapp.AppException('%s does not respond to ssh:\n%s'
% (location, e))
output = cliapp.ssh_runcmd(location, ['sh', '-c',
'test -d /baserock || echo -n dirnotfound'])
if output == 'dirnotfound':
raise cliapp.AppException('%s is not a baserock system'
% location)
output = cliapp.ssh_runcmd(location, ['sh', '-c',
'type rsync &> /dev/null || echo -n cmdnotfound'])
if output == 'cmdnotfound':
raise cliapp.AppException('%s does not have rsync'
% location)
SshRsyncWriteExtension().run()
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