Python結構任務可以調用其他任務並尊重它們的主機列表嗎？

Question

我有這樣一個fabfile如下：

@hosts('host1') 
def host1_deploy(): 
    """Some logic that is specific to deploying to host1""" 

@hosts('host2') 
def host2_deploy(): 
    """Some logic that is specific to deploying to host2""" 

def deploy(): 
    """"Deploy to both hosts, each using its own logic""" 
    host1_deploy() 
    host2_deploy() 

我願做

fab deploy 

，並把它等同於

fab host1_deploy host2_deploy 

換句話說，運行各子任務，併爲每個人使用它指定的主機列表。但是，這不起作用。相反，deploy（）任務需要它自己的主機列表，它將傳播給它的所有子任務。

有沒有辦法在這裏更新deploy（）任務，所以它會做我想要的，同時留下子任務，讓他們可以單獨運行？

Answer 1

有可能是一個更好的方式來處理它，但你可以通過兩臺主機部署（），然後在host1_deploy（）和host2_deploy（）檢查env.host：

def host1_deploy(): 
    if env.host in ['host1']: 
     run(whatever1) 

def host2_deploy(): 
    if env.host in ['host2']: 
     run(whatever2) 

@hosts('host1','host2') 
def deploy(): 
    host1_deploy() 
    host2_deploy() 

Answer 2

試試這一個。顯然你想用run或sudo替換本地。最關鍵的是空@hosts裝飾爲deploy

from fabric.api import local 
from fabric.decorators import hosts 

@hosts('host1') 
def host1_deploy(): 
    """Some logic that is specific to deploying to host1""" 
    local('echo foo') 

@hosts('host2') 
def host2_deploy(): 
    """Some logic that is specific to deploying to host2""" 
    local('echo bar') 

@hosts('') 
def deploy(): 
    """"Deploy to both hosts, each using its own logic""" 
    host1_deploy() 
    host2_deploy() 

Answer 3

這是跛，但它可以作爲面料的1.1.2

def host1_deploy(): 
    """Some logic that is specific to deploying to host1""" 
    if env.host in ["host1"]: 
     pass #this is only on host2 

def host2_deploy(): 
    """Some logic that is specific to deploying to host2""" 
    if env.host in ["host2"]: 
     pass #this is only on host2 

def deploy(): 
    """"Deploy to both hosts, each using its own logic""" 
    host1_deploy() 
    host2_deploy() 

這裏是我的測試代碼：

@task 
@roles(["prod_web","prod_workers"]) 
def test_multi(): 
    test_multi_a() 
    test_multi_b() 

def test_multi_a(): 
    if env.host in env.roledefs["prod_web"]: 
     run('uname -a') 

def test_multi_b(): 
    if env.host in env.roledefs["prod_workers"]: 
     run('uname -a') 

Answer 4

由於面料1.3 ，execute幫手現在可以做到這一點。該文檔可在此處獲得：Intelligently executing tasks with execute。

這裏是他們使用的例子：

from fabric.api import run, roles 

env.roledefs = { 
    'db': ['db1', 'db2'], 
    'web': ['web1', 'web2', 'web3'], 
} 

@roles('db') 
def migrate(): 
    # Database stuff here. 
    pass 

@roles('web') 
def update(): 
    # Code updates here. 
    pass 

然後運行從另一個任務deploy都migrate和web：

def deploy(): 
    execute(migrate) 
    execute(update) 

，這將尊重角色和主機列出了這些任務有。