tripleo-quickstart/library/generate_macs.py
Paul Belanger 200395275d
Fix H102 Apache 2.0 license header not found
Change-Id: I2ce7ec4535c509ca05cd31b8195f36d17aa4de07
Signed-off-by: Paul Belanger <pabelanger@redhat.com>
2016-07-29 14:08:00 -04:00

92 lines
3.1 KiB
Python

#!/usr/bin/python
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# generate_baremetal_macs method ripped from
# openstack/tripleo-incubator/scripts/configure-vm
DOCUMENTATION = '''
---
module: generate_macs
version_added: "2.0"
short_description: Generate a list of Ethernet MAC addresses
description:
- Generate a list of Ethernet MAC addresses suitable for baremetal testing.
'''
import math
import random
MAX_NUM_MACS = math.trunc(0xff / 2)
def generate_baremetal_macs(nodes, networks):
"""Generate an Ethernet MAC address suitable for baremetal testing."""
# NOTE(dprince): We generate our own bare metal MAC address's here
# instead of relying on libvirt so that we can ensure the
# locally administered bit is set low. (The libvirt default is
# to set the 2nd MSB high.) This effectively allows our
# fake baremetal VMs to more accurately behave like real hardware
# and fixes issues with bridge/DHCP configurations which rely
# on the fact that bridges assume the MAC address of the lowest
# attached NIC.
# MACs generated for a given machine will also be in sequential
# order, which matches how most BM machines are laid out as well.
# Additionally we increment each MAC by two places.
macs = []
count = len(nodes) * len(networks)
if count > MAX_NUM_MACS:
raise ValueError("The MAX num of MACS supported is %i "
"(you specified %i)." % (MAX_NUM_MACS, count))
base_nums = [0x00,
random.randint(0x00, 0xff),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff),
random.randint(0x00, 0xff)]
base_mac = ':'.join(map(lambda x: "%02x" % x, base_nums))
start = random.randint(0x00, 0xff)
if (start + (count * 2)) > 0xff:
# leave room to generate macs in sequence
start = 0xff - count * 2
for num in range(0, count * 2, 2):
mac = start + num
macs.append(base_mac + ":" + ("%02x" % mac))
result = {}
for node in nodes:
result[node['name']] = {}
for network in networks:
result[node['name']][network['name']] = macs.pop(0)
return result
def main():
module = AnsibleModule(
argument_spec=dict(
nodes=dict(required=True, type='list'),
networks=dict(required=True, type='list')
)
)
result = generate_baremetal_macs(module.params["nodes"],
module.params["networks"])
module.exit_json(**result)
# see http://docs.ansible.com/developing_modules.html#common-module-boilerplate
from ansible.module_utils.basic import AnsibleModule
if __name__ == '__main__':
main()