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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 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.
'''
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)
self.copy_kernel(temp_root, location, hostname)
self.copy_rootfs(temp_root, location, hostname)
self.configure_nfs(location, hostname)
def get_hostname(self, temp_root):
hostnamepath = os.path.join(temp_root, 'etc', 'hostname')
with open(hostnamepath) as f:
return f.readline().strip()
def copy_kernel(self, temp_root, location, 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('/srv/nfsboot/tftp', hostname)
rsync_dest = 'root@%s:%s' % (location, kernel_dest)
cliapp.runcmd(
['rsync', kernel_src, rsync_dest])
def copy_rootfs(self, temp_root, location, hostname):
rootfs_src = temp_root + '/'
rootfs_dest = os.path.join('/srv/nfsboot/nfs', hostname)
rsync_dest = 'root@%s:%s' % (location, rootfs_dest)
cliapp.runcmd(
['rsync', '-a', rootfs_src, rsync_dest])
def configure_nfs(self, location, hostname):
rootfs_dest = os.path.join('/srv/nfsboot/nfs', hostname)
exports_path = '/etc/exports'
# If that path is not already exported:
try:
cliapp.ssh_runcmd(
'root@%s' % location, ['grep', '-q', rootfs_dest,
exports_path])
except cliapp.AppException:
ip_mask = '*'
options = 'rw,no_subtree_check,no_root_squash,async'
exports_string = '%s %s(%s)\n' % (rootfs_dest, 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, ['systemctl', 'restart',
'nfs-server.service'])
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 an nfs server'
% server)
try:
cliapp.ssh_runcmd(
'root@%s' % server, ['systemctl', 'is-enabled',
'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()
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