def __virtual__():
    if 'docker.version' in __salt__:
        return __virtualname__
    return False
Parse the given revision spec.
dataset/ETHPy150Open saltstack/salt/salt/states/dockerio.py/__virtual__--crossover with--dataset/ETHPy150Open reviewboard/rbtools/rbtools/clients/mercurial.py/MercurialClient.parse_revision_spec