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-rwxr-xr-xkvm.check169
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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 'kvm' write extension'''
+
+import cliapp
+import os
+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_can_create_file_at_given_path(ssh_host, vm_path)
+ self.check_no_existing_libvirt_vm(ssh_host, vm_name)
+ self.check_extra_disks_exist(ssh_host, self.parse_attach_disks())
+ self.check_virtual_networks_are_started(ssh_host)
+ self.check_host_has_virtinstall(ssh_host)
+
+ 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_can_create_file_at_given_path(self, ssh_host, vm_path):
+
+ def check_can_write_to_given_path():
+ try:
+ cliapp.ssh_runcmd(ssh_host, ['touch', vm_path])
+ except cliapp.AppException as e:
+ raise cliapp.AppException("Can't write to location %s on %s"
+ % (vm_path, ssh_host))
+ else:
+ cliapp.ssh_runcmd(ssh_host, ['rm', vm_path])
+
+ try:
+ cliapp.ssh_runcmd(ssh_host, ['test', '-e', vm_path])
+ except cliapp.AppException as e:
+ # vm_path doesn't already exist, so let's test we can write
+ check_can_write_to_given_path()
+ else:
+ raise cliapp.AppException('%s already exists on %s'
+ % (vm_path, ssh_host))
+
+ 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))
+
+ def check_virtual_networks_are_started(self, ssh_host):
+
+ def check_virtual_network_is_started(network_name):
+ cmd = ['virsh', '-c', 'qemu:///system', 'net-info', network_name]
+ net_info = cliapp.ssh_runcmd(ssh_host, cmd).split('\n')
+
+ def pretty_concat(lines):
+ return '\n'.join(['\t%s' % line for line in lines])
+
+ for line in net_info:
+ m = re.match('^Active:\W*(\w+)\W*', line)
+ if m:
+ break
+ else:
+ raise cliapp.AppException(
+ "Got unexpected output parsing output of `%s':\n%s"
+ % (' '.join(cmd), pretty_concat(net_info)))
+
+ network_active = m.group(1) == 'yes'
+
+ if not network_active:
+ raise cliapp.AppException("Network '%s' is not started"
+ % network_name)
+
+ def name(nic_entry):
+ if ',' in nic_entry:
+ # network=NETWORK_NAME,mac=12:34,model=e1000...
+ return nic_entry[:nic_entry.find(',')].lstrip('network=')
+ else:
+ return nic_entry.lstrip('network=') # NETWORK_NAME
+
+ if 'NIC_CONFIG' in os.environ:
+ nics = os.environ['NIC_CONFIG'].split()
+
+ for n in nics:
+ if not (n.startswith('network=')
+ or n.startswith('bridge=')
+ or n == 'user'):
+ raise cliapp.AppException('malformed NIC_CONFIG: %s\n'
+ " (expected 'bridge=BRIDGE' 'network=NAME'"
+ " or 'user')" % n)
+
+ # --network bridge= is used to specify a bridge
+ # --network user is used to specify a form of NAT
+ # (see the virt-install(1) man page)
+ networks = [name(n) for n in nics if not n.startswith('bridge=')
+ and not n.startswith('user')]
+ else:
+ networks = ['default']
+
+ for network in networks:
+ check_virtual_network_is_started(network)
+
+ def check_host_has_virtinstall(self, ssh_host):
+ try:
+ cliapp.ssh_runcmd(ssh_host, ['which', 'virt-install'])
+ except cliapp.AppException:
+ raise cliapp.AppException(
+ 'virt-install does not seem to be installed on host %s'
+ % ssh_host)
+
+
+KvmPlusSshCheckExtension().run()