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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
#!/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 deploying to an nfsboot server
An nfsboot server is defined as a baserock system that has tftp and nfs
servers running, the tftp server is exporting the contents of
/srv/nfsboot/tftp/ and the user has sufficient permissions to create nfs roots
in /srv/nfsboot/nfs/
'''
import cliapp
import os
import glob
import morphlib.writeexts
class NFSBootWriteExtension(morphlib.writeexts.WriteExtension):
'''Create an NFS root and kernel on TFTP during Morph's deployment.
The location command line argument is the hostname of the nfsboot server.
The user is expected to provide the location argument
using the following syntax:
HOST
where:
* HOST is the host of the nfsboot server
The extension will connect to root@HOST via ssh to copy the kernel and
rootfs, and configure the nfs server.
It requires root because it uses systemd, and reads/writes to /etc.
'''
_nfsboot_root = '/srv/nfsboot'
def process_args(self, args):
if len(args) != 2:
raise cliapp.AppException('Wrong number of command line args')
temp_root, location = args
hostname = self.get_hostname(temp_root)
if hostname == 'baserock':
raise cliapp.AppException('It is forbidden to nfsboot a system '
'with hostname "baserock"')
self.test_good_server(location)
version_label = os.getenv('VERSION_LABEL', 'factory')
versioned_root = os.path.join(self._nfsboot_root, hostname, 'systems',
version_label)
if self.version_exists(versioned_root, location):
raise cliapp.AppException('Version %s already exists on'
' this device. Deployment aborted'
% version_label)
self.copy_rootfs(temp_root, location, versioned_root, hostname)
self.copy_kernel(temp_root, location, versioned_root, version_label,
hostname)
self.configure_nfs(location, hostname)
def version_exists(self, versioned_root, location):
try:
cliapp.ssh_runcmd('root@%s' % location,
['test', '-d', versioned_root])
except cliapp.AppException:
return False
return True
def get_hostname(self, temp_root):
hostnamepath = os.path.join(temp_root, 'etc', 'hostname')
with open(hostnamepath) as f:
return f.readline().strip()
def create_local_state(self, location, hostname):
statedir = os.path.join(self._nfsboot_root, hostname, 'state')
subdirs = [os.path.join(statedir, 'home'),
os.path.join(statedir, 'opt'),
os.path.join(statedir, 'srv')]
cliapp.ssh_runcmd('root@%s' % location,
['mkdir', '-p'] + subdirs)
def copy_kernel(self, temp_root, location, versioned_root, version,
hostname):
bootdir = os.path.join(temp_root, 'boot')
image_names = ['vmlinuz', 'zImage', 'uImage']
for name in image_names:
try_path = os.path.join(bootdir, name)
if os.path.exists(try_path):
kernel_src = try_path
break
else:
raise cliapp.AppException(
'Could not find a kernel in the system: none of '
'%s found' % ', '.join(image_names))
kernel_dest = os.path.join(versioned_root, 'orig', 'kernel')
rsync_dest = 'root@%s:%s' % (location, kernel_dest)
self.status(msg='Copying kernel')
cliapp.runcmd(
['rsync', '-s', kernel_src, rsync_dest])
# Link the kernel to the right place
self.status(msg='Creating links to kernel in tftp directory')
tftp_dir = os.path.join(self._nfsboot_root , 'tftp')
versioned_kernel_name = "%s-%s" % (hostname, version)
kernel_name = hostname
try:
cliapp.ssh_runcmd('root@%s' % location,
['ln', '-f', kernel_dest,
os.path.join(tftp_dir, versioned_kernel_name)])
cliapp.ssh_runcmd('root@%s' % location,
['ln', '-sf', versioned_kernel_name,
os.path.join(tftp_dir, kernel_name)])
except cliapp.AppException:
raise cliapp.AppException('Could not create symlinks to the '
'kernel at %s in %s on %s'
% (kernel_dest, tftp_dir, location))
def copy_rootfs(self, temp_root, location, versioned_root, hostname):
rootfs_src = temp_root + '/'
orig_path = os.path.join(versioned_root, 'orig')
run_path = os.path.join(versioned_root, 'run')
self.status(msg='Creating destination directories')
try:
cliapp.ssh_runcmd('root@%s' % location,
['mkdir', '-p', orig_path, run_path])
except cliapp.AppException:
raise cliapp.AppException('Could not create dirs %s and %s on %s'
% (orig_path, run_path, location))
self.status(msg='Creating \'orig\' rootfs')
cliapp.runcmd(
['rsync', '-asXSPH', '--delete', rootfs_src,
'root@%s:%s' % (location, orig_path)])
self.status(msg='Creating \'run\' rootfs')
try:
cliapp.ssh_runcmd('root@%s' % location,
['rm', '-rf', run_path])
cliapp.ssh_runcmd('root@%s' % location,
['cp', '-al', orig_path, run_path])
cliapp.ssh_runcmd('root@%s' % location,
['rm', '-rf', os.path.join(run_path, 'etc')])
cliapp.ssh_runcmd('root@%s' % location,
['cp', '-a', os.path.join(orig_path, 'etc'),
os.path.join(run_path, 'etc')])
except cliapp.AppException:
raise cliapp.AppException('Could not create \'run\' rootfs'
' from \'orig\'')
self.status(msg='Linking \'default\' to latest system')
try:
cliapp.ssh_runcmd('root@%s' % location,
['ln', '-sfn', versioned_root,
os.path.join(self._nfsboot_root, hostname, 'systems',
'default')])
except cliapp.AppException:
raise cliapp.AppException('Could not link \'default\' to %s'
% versioned_root)
def configure_nfs(self, location, hostname):
exported_path = os.path.join(self._nfsboot_root, hostname)
exports_path = '/etc/exports'
# If that path is not already exported:
try:
cliapp.ssh_runcmd(
'root@%s' % location, ['grep', '-q', exported_path,
exports_path])
except cliapp.AppException:
ip_mask = '*'
options = 'rw,no_subtree_check,no_root_squash,async'
exports_string = '%s %s(%s)\n' % (exported_path, ip_mask, options)
exports_append_sh = '''\
set -eu
target="$1"
temp=$(mktemp)
cat "$target" > "$temp"
cat >> "$temp"
mv "$temp" "$target"
'''
cliapp.ssh_runcmd(
'root@%s' % location,
['sh', '-c', exports_append_sh, '--', exports_path],
feed_stdin=exports_string)
cliapp.ssh_runcmd(
'root@%s' % location, ['exportfs', '-a'])
def test_good_server(self, server):
# Can be ssh'ed into
try:
cliapp.ssh_runcmd('root@%s' % server, ['true'])
except cliapp.AppException:
raise cliapp.AppException('You are unable to ssh into server %s'
% server)
# Is an NFS server
try:
cliapp.ssh_runcmd(
'root@%s' % server, ['test', '-e', '/etc/exports'])
except cliapp.AppException:
raise cliapp.AppException('Server %s is not exporting any file '
'systems' % server)
try:
cliapp.ssh_runcmd(
'root@%s' % server, ['systemctl', 'is-active',
'nfs-server.service'])
except cliapp.AppException:
raise cliapp.AppException('server %s does not control its '
'nfs server by systemd' % server)
# TFTP server exports /srv/nfsboot/tftp
try:
cliapp.ssh_runcmd(
'root@%s' % server, ['test' , '-d', '/srv/nfsboot/tftp'])
except cliapp.AppException:
raise cliapp.AppException('server %s does not export '
'/srv/nfsboot/tftp' % server)
NFSBootWriteExtension().run()
|
