1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
#!/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])
raise
def get_old_orig(self, location, remote_mnt):
'''Identify which subvolume to snapshot from'''
# rawdisk upgrades use 'default'
return os.path.join(remote_mnt, 'systems', 'default', '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])
raise
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])
raise
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_root = os.path.join(remote_mnt, 'systems',
version_label, 'orig')
config_sync = os.path.join(system_root, 'usr', 'bin',
'baserock-system-config-sync')
version_manager = os.path.join(system_root, 'usr', 'bin',
'system-version-manager')
with self._deployed_version(location, version_label,
config_sync, version_manager):
self.status(msg='Setting %(v)s as the new default system',
v=version_label)
cliapp.ssh_runcmd(location, [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()
|