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#!/usr/bin/python
# Copyright (C) 2014-2015 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, see <http://www.gnu.org/licenses/>.
'''Preparatory checks for Morph 'nfsboot' write extension'''
import cliapp
import os
import morphlib.writeexts
class NFSBootCheckExtension(morphlib.writeexts.WriteExtension):
_nfsboot_root = '/srv/nfsboot'
def process_args(self, args):
if len(args) != 1:
raise cliapp.AppException('Wrong number of command line args')
location = args[0]
upgrade = self.get_environment_boolean('UPGRADE')
if upgrade:
raise cliapp.AppException(
'Upgrading is not currently supported for NFS deployments.')
hostname = os.environ.get('HOSTNAME', None)
if hostname is None:
raise cliapp.AppException('You must specify a HOSTNAME.')
if hostname == 'baserock':
raise cliapp.AppException('It is forbidden to nfsboot a system '
'with hostname "%s"' % hostname)
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(
'Root file system for host %s (version %s) already exists on '
'the NFS server %s. Deployment aborted.' % (hostname,
version_label, location))
def test_good_server(self, server):
self.check_ssh_connectivity(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
tftp_root = os.path.join(self._nfsboot_root, 'tftp')
try:
cliapp.ssh_runcmd(
'root@%s' % server, ['test' , '-d', tftp_root])
except cliapp.AppException:
raise cliapp.AppException('server %s does not export %s' %
(tftp_root, server))
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
NFSBootCheckExtension().run()
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