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#!/usr/bin/python
# Copyright (C) 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.
'''Preparatory checks for Morph 'kvm' write extension'''
import cliapp
import re
import urlparse
import morphlib.writeexts
class KvmPlusSshCheckExtension(morphlib.writeexts.WriteExtension):
location_pattern = '^/(?P<guest>[^/]+)(?P<path>/.+)$'
def process_args(self, args):
if len(args) != 1:
raise cliapp.AppException('Wrong number of command line args')
self.require_btrfs_in_deployment_host_kernel()
upgrade = self.get_environment_boolean('UPGRADE')
if upgrade:
raise cliapp.AppException(
'Use the `ssh-rsync` write extension to deploy upgrades to an '
'existing remote system.')
location = args[0]
ssh_host, vm_name, vm_path = self.check_and_parse_location(location)
self.check_ssh_connectivity(ssh_host)
self.check_no_existing_libvirt_vm(ssh_host, vm_name)
self.check_extra_disks_exist(ssh_host, self.parse_attach_disks())
def check_and_parse_location(self, location):
'''Check and parse the location argument to get relevant data.'''
x = urlparse.urlparse(location)
if x.scheme != 'kvm+ssh':
raise cliapp.AppException(
'URL schema must be kvm+ssh in %s' % location)
m = re.match(self.location_pattern, x.path)
if not m:
raise cliapp.AppException('Cannot parse location %s' % location)
return x.netloc, m.group('guest'), m.group('path')
def check_no_existing_libvirt_vm(self, ssh_host, vm_name):
try:
cliapp.ssh_runcmd(ssh_host,
['virsh', '--connect', 'qemu:///system', 'domstate', vm_name])
except cliapp.AppException as e:
pass
else:
raise cliapp.AppException(
'Host %s already has a VM named %s. You can use the ssh-rsync '
'write extension to deploy upgrades to existing machines.' %
(ssh_host, vm_name))
def check_extra_disks_exist(self, ssh_host, filename_list):
for filename in filename_list:
try:
cliapp.ssh_runcmd(ssh_host, ['ls', filename])
except cliapp.AppException as e:
raise cliapp.AppException('Did not find file %s on host %s' %
(filename, ssh_host))
KvmPlusSshCheckExtension().run()
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