def __virtual__():
    if not salt.utils.which('chef-client'):
        return (False, 'Cannot load chef module: chef-client not found')
    return True
Dispatcher for the different types of constraints.
dataset/ETHPy150Open saltstack/salt/salt/modules/chef.py/__virtual__--crossover with--dataset/ETHPy150Open goFrendiAsgard/kokoropy/kokoropy/packages/alembic/autogenerate/render.py/_add_constraint