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# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2012 Michael Still and Canonical Inc
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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"""Config Drive v2 helper."""
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from nova.api.metadata import base as instance_metadata
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from nova import exception
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from nova import flags
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova import utils
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from nova import version
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from nova.virt.libvirt import utils as virtutils
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LOG = logging.getLogger(__name__)
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cfg.StrOpt('config_drive_format',
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help='Config drive format. One of iso9660 (default) or vfat'),
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cfg.StrOpt('config_drive_tempdir',
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default=tempfile.tempdir,
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help=('Where to put temporary files associated with '
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'config drive creation')),
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FLAGS.register_opts(configdrive_opts)
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class ConfigDriveBuilder(object):
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def __init__(self, instance_md=None):
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# TODO(mikal): I don't think I can use utils.tempdir here, because
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# I need to have the directory last longer than the scope of this
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self.tempdir = tempfile.mkdtemp(dir=FLAGS.config_drive_tempdir,
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if instance_md is not None:
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self.add_instance_metadata(instance_md)
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def _add_file(self, path, data):
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filepath = os.path.join(self.tempdir, path)
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dirname = os.path.dirname(filepath)
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virtutils.ensure_tree(dirname)
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with open(filepath, 'w') as f:
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def add_instance_metadata(self, instance_md):
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for (path, value) in instance_md.metadata_for_config_drive():
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self._add_file(path, value)
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LOG.debug(_('Added %(filepath)s to config drive'),
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def _make_iso9660(self, path):
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utils.execute('genisoimage',
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'-publisher', ('"OpenStack nova %s"'
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% version.version_string()),
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def _make_vfat(self, path):
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# NOTE(mikal): This is a little horrible, but I couldn't find an
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# equivalent to genisoimage for vfat filesystems. vfat images are
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with open(path, 'w') as f:
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f.truncate(64 * 1024 * 1024)
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virtutils.mkfs('vfat', path, label='config-2')
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mountdir = tempfile.mkdtemp(dir=FLAGS.config_drive_tempdir,
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_out, err = utils.trycmd('mount', '-o', 'loop', path, mountdir,
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raise exception.ConfigDriveMountFailed(operation='mount',
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_out, err = utils.trycmd('chown',
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'%s.%s' % (os.getuid(), os.getgid()),
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mountdir, run_as_root=True)
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raise exception.ConfigDriveMountFailed(operation='chown',
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# NOTE(mikal): I can't just use shutils.copytree here, because the
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# destination directory already exists. This is annoying.
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for ent in os.listdir(self.tempdir):
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shutil.copytree(os.path.join(self.tempdir, ent),
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os.path.join(mountdir, ent))
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utils.execute('umount', mountdir, run_as_root=True)
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shutil.rmtree(mountdir)
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def make_drive(self, path):
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if FLAGS.config_drive_format == 'iso9660':
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self._make_iso9660(path)
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elif FLAGS.config_drive_format == 'vfat':
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self._make_vfat(path)
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raise exception.ConfigDriveUnknownFormat(
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format=FLAGS.config_drive_format)
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utils.delete_if_exists(self.imagefile)
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shutil.rmtree(self.tempdir)
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LOG.error(_('Could not remove tmpdir: %s'), str(e))
added
removed
nova/virt/configdrive.py
