Simple example of a "new-style" Fabric task

fabfile.py

# For reference, see:
# - http://docs.fabfile.org/en/1.12.0/usage/tasks.html#new-style-tasks
# - http://docs.fabfile.org/en/1.12.0/api/core/tasks.html
# - http://docs.fabfile.org/en/1.12.0/usage/execution.html#execute
from fabric.api import env, run, roles, execute
from fabric.tasks import Task

env.use_ssh_config = True

env.roledefs = {
    "prod": ['server-1'],
    "dev": ['server-2']
}


class MyTask(Task):
    """ Description for MyTask... """
    name = 'my_task'

    def run(self, *args, **kwargs):
        if 'dest' in kwargs:
            execute(self.uname, roles=[kwargs['dest']])
        else:
            execute(self.uname)

    @roles('prod')
    def uname(self):
        run('uname -a')


_ = MyTask()