Python Fabric - 找不到主机

Question

I don't know what I'm doing wrong. It seems like a simple thing that should work. I can run the task "test_task" by itself and it works. If i run it as part of the "deploy_test" function then it prompts me with: No hosts found. Please specify (single) host string for connection:

env.roledefs = {
    'test_servers': ['testserver1.domain.com', 'testserver2.domain.com']
}

@roles("test_servers")
def test_task():
    env.user = "test_user"
    sudo("sh /usr/bin/something", user="other_user")

def deploy_test():
    test_task()  

Answer 1

The decorator only works if you execute the task from fab command:

fab test_task

If you want to use the task deploy_test , you have many options:

1.- Execute test_task as a task, not as function. This is the way to go if you have other tasks that should be executed on deploy_test() on a different host list:

def deploy_test():
   execute(test_task)  

2.- Put the role decorator on deploy_test() :

@roles("test_servers")
def deploy_test():
   test_task()

Keep in mind that a python function is different from a fabric task. A fabric task do some stuff under the hood, like setting the host list, the user, and this state is keeped if you call python functions.