77 lines
3.0 KiB
Python
77 lines
3.0 KiB
Python
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Gather root device hint from recognized block devices."""
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import logging
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from ironic_discoverd.plugins import base
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LOG = logging.getLogger('ironic_discoverd.plugins.root_device_hint')
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class RootDeviceHintHook(base.ProcessingHook):
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"""Interact with Instack ramdisk for discovery data processing hooks.
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The plugin can figure out the root device in 2 runs. First, it saves the
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discovered block device serials in node.extra. The second run will check
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the difference between the recently discovered block devices and the
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previously saved ones. After saving the root device in node.properties, it
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will delete the temporarily saved block device serials in node.extra.
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This way, it helps to figure out the root device hint in cases when
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otherwise Ironic doesn't have enough information to do so. Such a usecase
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is DRAC RAID configuration where the BMC doesn't provide any useful
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information about the created RAID disks. Using this plugin immediately
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before and after creating the root RAID device will solve the issue of root
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device hints.
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"""
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def before_update(self, node, ports, node_info):
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if 'root_device' in node.properties:
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LOG.info('Root device is already known for the node.')
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return [], {}
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if 'block_devices' in node.extra:
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# Compare previously discovered devices with the current ones
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previous_devices = node.extra['block_devices']['serials']
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current_devices = node_info['block_devices']['serials']
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new_devices = [device for device in current_devices
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if device not in previous_devices]
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if len(new_devices) > 1:
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LOG.warning('Root device cannot be identified because '
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'multiple new devices were found.')
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return [], {}
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elif len(new_devices) == 0:
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LOG.warning('No new devices were found.')
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return [], {}
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return [
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{'op': 'remove',
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'path': '/extra/block_devices'},
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{'op': 'add',
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'path': '/properties/root_device',
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'value': {'serial': new_devices[0]}}
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], {}
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else:
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# No previously discovered devices - save the discoverd block
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# devices in node.extra
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return [
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{'op': 'add',
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'path': '/extra/block_devices',
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'value': node_info['block_devices']}
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], {}
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