92 lines
3.1 KiB
Python
92 lines
3.1 KiB
Python
#!/usr/bin/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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# generate_baremetal_macs method ripped from
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# openstack/tripleo-incubator/scripts/configure-vm
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DOCUMENTATION = '''
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---
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module: generate_macs
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version_added: "2.0"
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short_description: Generate a list of Ethernet MAC addresses
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description:
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- Generate a list of Ethernet MAC addresses suitable for baremetal testing.
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'''
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import math
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import random
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MAX_NUM_MACS = math.trunc(0xff / 2)
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def generate_baremetal_macs(nodes, networks):
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"""Generate an Ethernet MAC address suitable for baremetal testing."""
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# NOTE(dprince): We generate our own bare metal MAC address's here
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# instead of relying on libvirt so that we can ensure the
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# locally administered bit is set low. (The libvirt default is
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# to set the 2nd MSB high.) This effectively allows our
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# fake baremetal VMs to more accurately behave like real hardware
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# and fixes issues with bridge/DHCP configurations which rely
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# on the fact that bridges assume the MAC address of the lowest
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# attached NIC.
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# MACs generated for a given machine will also be in sequential
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# order, which matches how most BM machines are laid out as well.
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# Additionally we increment each MAC by two places.
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macs = []
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count = len(nodes) * len(networks)
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if count > MAX_NUM_MACS:
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raise ValueError("The MAX num of MACS supported is %i "
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"(you specified %i)." % (MAX_NUM_MACS, count))
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base_nums = [0x00,
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random.randint(0x00, 0xff),
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random.randint(0x00, 0xff),
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random.randint(0x00, 0xff),
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random.randint(0x00, 0xff)]
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base_mac = ':'.join(map(lambda x: "%02x" % x, base_nums))
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start = random.randint(0x00, 0xff)
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if (start + (count * 2)) > 0xff:
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# leave room to generate macs in sequence
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start = 0xff - count * 2
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for num in range(0, count * 2, 2):
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mac = start + num
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macs.append(base_mac + ":" + ("%02x" % mac))
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result = {}
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for node in nodes:
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result[node['name']] = {}
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for network in networks:
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result[node['name']][network['name']] = macs.pop(0)
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return result
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def main():
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module = AnsibleModule(
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argument_spec=dict(
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nodes=dict(required=True, type='list'),
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networks=dict(required=True, type='list')
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)
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)
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result = generate_baremetal_macs(module.params["nodes"],
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module.params["networks"])
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module.exit_json(**result)
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# see http://docs.ansible.com/developing_modules.html#common-module-boilerplate
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from ansible.module_utils.basic import AnsibleModule
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if __name__ == '__main__':
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main()
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