Re: [Fab-user] with_settings decorator generating RuntimeError (generator didn't yield)

[Carlos García]

Hi Felix, 

Have you try to use a context manager instead of the decorator? I´m not really sure if you can use it as a decorator... 

def _my_function():

  with_settings(hide("status")):

    try:

        out = run("uname")

        puts("OS is " + out)

    except SystemExit:

        puts("can't get the OS")

That's the way I'm using it in my scripts and it seems to work, but we're using it just for Ubuntu and CentOS...

Keep us posted

Regards!

2015-03-12 0:53 GMT+01:00 Felix Almeida <address@hidden>:

Hi all,

 

  I need to validate if a certain UNIX account is able to log in to a series of servers of mixed flavors (HP-UX, Solaris, RHEL and AIX) so I’m trying to do it with fabric.

 

  I wanted to apply hide("status") to an entire internal function, but I keep getting the following error:

 

elxin009: ~/fabric # fab main

[bsnbk001] out: SunOS

[bsnbk001] out:

[bsnbk001] OS is SunOS

Disconnecting from bsnbk001... done.

Traceback (most recent call last):

  File "/usr/local/lib/python2.7/site-packages/fabric/main.py", line 743, in main

    *args, **kwargs

  File "/usr/local/lib/python2.7/site-packages/fabric/tasks.py", line 424, in execute

    results['<local-only>'] = task.run(*args, **new_kwargs)

  File "/usr/local/lib/python2.7/site-packages/fabric/tasks.py", line 174, in run

    return self.wrapped(*args, **kwargs)

  File "/home/felix/fabric/fabfile.py", line 24, in main

    execute(_my_function, hosts=host_list)

  File "/usr/local/lib/python2.7/site-packages/fabric/tasks.py", line 384, in execute

    multiprocessing

  File "/usr/local/lib/python2.7/site-packages/fabric/tasks.py", line 274, in _execute

    return task.run(*args, **kwargs)

  File "/usr/local/lib/python2.7/site-packages/fabric/tasks.py", line 174, in run

    return self.wrapped(*args, **kwargs)

  File "/usr/local/lib/python2.7/site-packages/fabric/decorators.py", line 215, in inner

    with settings(*arg_settings, **kw_settings):

  File "/usr/local/lib/python2.7/contextlib.py", line 17, in __enter__

    return self.gen.next()

  File "/usr/local/lib/python2.7/contextlib.py", line 112, in nested

    vars.append(enter())

  File "/usr/local/lib/python2.7/contextlib.py", line 19, in __enter__

    raise RuntimeError("generator didn't yield")

RuntimeError: generator didn't yield

 

  This is a very simplified version of my original code that I’m using for troubleshooting since it generates the same error:

 

from fabric.api import task, hide, execute, env, puts, run, with_settings

 

env.use_shell = False

env.disable_known_hosts = True

env.warn_only = True

env.abort_on_prompts = True

env.skip_bad_hosts = True

env.command_timeout = 3

env.eagerly_disconnect = True

env.always_use_pty = False

 

@with_settings(hide("status"))

def _my_function():

    try:

        out = run("uname")

        puts("OS is " + out)

    except SystemExit:

        puts("can't get the OS")

 

@task

def main():

    host_list = [line.rstrip("\n") for line in open("hosts.txt")]

    with hide("running"):

        execute(_my_function, hosts=host_list)

 

  The hosts.txt file is just a text file with one hostname per line. This was the content of the file when I captured the output above (just two servers):

 

bsnbk001

slxap003

 

  In fact, none of the env settings makes any difference, but if I comment out the @with_settings line it works as expected. If the hosts.txt file contains only one hostname then it also works without any errors.

 

  Please, any ideas of what I am doing wrong? I’m still learning Python so forgive me if I’m doing something silly.

 

 

Thank you,

Felix

 

PS: I’m running Fabric 1.10.1 and Paramiko 1.15.2 on RHEL.

 

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