Transcript for comment on http://stackoverflow.com/a/17724207/160665

transcript

┌─[10:15:19] michel@PC12-331  
└─~/tmp› cat fabfile.py
import fabric.api as fab


fab.env.roledefs['staging'] = ['bbs-evolution.ipsw.dt.ept.lu']
fab.env.roledefs['prod'] = ['bbs-arbiter.ipsw.dt.ept.lu']


@fab.task
def mytask():
    print fab.env.roles
    print fab.run('hostname')
┌─[10:15:24] michel@PC12-331  
└─~/tmp› fab mytask:roles="staging,prod"
[bbs-evolution.ipsw.dt.ept.lu] Executing task 'mytask'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/fabric/main.py", line 743, in main
    *args, **kwargs
  File "/usr/local/lib/python2.7/dist-packages/fabric/tasks.py", line 368, in execute
    multiprocessing
  File "/usr/local/lib/python2.7/dist-packages/fabric/tasks.py", line 264, in _execute
    return task.run(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/fabric/tasks.py", line 171, in run
    return self.wrapped(*args, **kwargs)
TypeError: mytask() takes no arguments (1 given)
┌─[10:16:26] michel@PC12-331  
└─~/tmp› fab mytask -R "staging,prod"
[bbs-nexus.ipsw.dt.ept.lu] Executing task 'mytask'
['staging', 'prod']
[bbs-nexus.ipsw.dt.ept.lu] run: hostname
[bbs-nexus.ipsw.dt.ept.lu] out: BBS-nexus.ipsw.dt.ept.lu
[bbs-nexus.ipsw.dt.ept.lu] out: 

BBS-nexus.ipsw.dt.ept.lu
[bbs-pylon.ipsw.dt.ept.lu] Executing task 'mytask'
['staging', 'prod']
[bbs-pylon.ipsw.dt.ept.lu] run: hostname
[bbs-pylon.ipsw.dt.ept.lu] out: BBS-pylon.ipsw.dt.ept.lu
[bbs-pylon.ipsw.dt.ept.lu] out: 

BBS-pylon.ipsw.dt.ept.lu

Done.
Disconnecting from bbs-nexus.ipsw.dt.ept.lu... done.
Disconnecting from bbs-pylon.ipsw.dt.ept.lu... done.

Should be fab mytask:roles="staging;prod". Use semi-colon, not comma.