A simple hypervisor controller
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import os
from random import randint
class TapDevice(object):
"""
Utility class - adds/removes a tap device on the linux system. Can be used as a context manager.
"""
def __init__(self):
self.num = randint(0, 100000)
def create(self):
os.system("ip tuntap add name {} mode tap".format(self))
def destroy(self):
os.system("ip link delete {}".format(self))
def __str__(self):
return "tap{}".format(self.num)
def __enter__(self):
self.create()
return str(self)
def __exit__(self, type, value, traceback):
self.destroy()
class Machine(object):
"""
All runnable types should subclass this
"""
def __init__(self, machine_spec):
self.spec = machine_spec
def run_machine(self):
"""
Run the machine and block until it exits (or was killed)
"""
raise NotImplemented()
def stop_machine(self):
"""
Ask the machine to stop nicely
"""
raise NotImplemented()
def kill_machine(self):
"""
Stop the machine, brutally
"""
raise NotImplemented()
def get_datastore_path(self, datastore_name, *paths):
"""
Resolve the filesystem path for a path in the given datastore
"""
return self.spec.master.datastores.get(datastore_name).get_filepath(*paths)