Python 结构设置问题（）

运行Fabric的最新版本（1.11.1）（Paramiko（1.16.0）、Python（2.7.11））时，我遇到了一个最奇怪的错误，我做了一些概念验证来尝试它

from fabric.api import run, sudo, task
from fabric.context_managers import settings


@task
def test():
    print('regular run')
    run('whoami')

    print('regular sudo')
    sudo('whoami')

    print('sudo with user arg')
    sudo('whoami', user='www-data')

    with settings(user='www-data'):
        print('run inside settings')
        run('whoami')

输出：

$ fab -f test.py -H vagrant@127.0.0.1:2222 test
[vagrant@127.0.0.1:2222] Executing task 'test'
regular run
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- good
[vagrant@127.0.0.1:2222] out: 

regular sudo
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: root           # <--- good
[vagrant@127.0.0.1:2222] out: 

sudo with user arg
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 

run inside settings
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- WHAT THE HECK!? this used to work
[vagrant@127.0.0.1:2222] out: 


Done.

$ fab -f test.py -H vagrant@127.0.0.1:2222 test
[vagrant@127.0.0.1:2222] Executing task 'test'
regular run
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- good
[vagrant@127.0.0.1:2222] out: 

regular sudo
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: root           # <--- good
[vagrant@127.0.0.1:2222] out: 

sudo with user arg
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 

run inside settings
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 


Done.

$fab-f test.py-Hvagrant@127.0.0.1：2222测试
[vagrant@127.0.0.1：2222]正在执行任务“测试”
常规跑步
[vagrant@127.0.0.1：2222]run:whoami
[vagrant@127.0.0.1：2222]out:vagrant#另一个织物问题，如果你做一些可爱的事情，比如：
-Hvagrant@127.0.0.1：2222
在内部，它不会将其分解为您所期望的：
env.user='vagrant'；env.host='127.0.0.1'；env.port='2222'
但它只是将其保存在主机字符串中。所以啊，这是世界上最丑的黑客：

这有助于保持代码相当“干净”，并且不会有一堆带有设置的
（host_string='www-data@'+env.host_string.split（'@'）[1]）：
到处都是，只有在定义fabric命令（如：
fab.）时，它们才会断开--user=vagrant--host=127.0.0.1--port=2222
。此解决方案适用于以下情况：

fab-f test.py--user=vagrant--host=127.0.0.1--port=2222 test

fab-f test.py-Hvagrant@127.0.0.1：2222测试


老办法

输出：

$ fab -f test.py -H vagrant@127.0.0.1:2222 test
[vagrant@127.0.0.1:2222] Executing task 'test'
regular run
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- good
[vagrant@127.0.0.1:2222] out: 

regular sudo
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: root           # <--- good
[vagrant@127.0.0.1:2222] out: 

sudo with user arg
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 

run inside settings
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- WHAT THE HECK!? this used to work
[vagrant@127.0.0.1:2222] out: 


Done.

$ fab -f test.py -H vagrant@127.0.0.1:2222 test
[vagrant@127.0.0.1:2222] Executing task 'test'
regular run
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: vagrant        # <--- good
[vagrant@127.0.0.1:2222] out: 

regular sudo
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: root           # <--- good
[vagrant@127.0.0.1:2222] out: 

sudo with user arg
[vagrant@127.0.0.1:2222] sudo: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 

run inside settings
[vagrant@127.0.0.1:2222] run: whoami
[vagrant@127.0.0.1:2222] out: www-data       # <--- good
[vagrant@127.0.0.1:2222] out: 


Done.

$fab-f test.py-Hvagrant@127.0.0.1：2222测试
[vagrant@127.0.0.1：2222]正在执行任务“测试”
常规跑步
[vagrant@127.0.0.1：2222]run:whoami
[vagrant@127.0.0.1：2222]外出：流浪汉#