Hi Carlos,
Yes, if I do that it works (in fact that’s how it was before):
def _my_function():
with settings(hide("status")):
try:
out = run("uname")
puts("OS is " + out)
except SystemExit:
puts("can't get the OS")
However having to indent the whole function body just because I want to hide
the status messages is weird, especially after reading this:
“Allows you to wrap an entire function as if it was called inside a block with
the settings context manager. This may be useful if you know you want a given
setting applied to an entire function body...” (source:
http://docs.fabfile.org/en/latest/api/core/decorators.html#fabric.decorators.with_settings).
Which is exactly what I want.
Anyway, maybe I should just do that and move on, but it’s kind of frustrating.
Moreover, now I’m curious about why this error is happening and I’m sure
there is a learning opportunity there for me. ;)
Thanks,
Felix
From: Carlos García [mailto:[email protected]]
Sent: Thursday, March 12, 2015 5:04 AM
To: Felix Almeida
Cc: [email protected]
Subject: Re: [Fab-user] with_settings decorator generating RuntimeError
(generator didn't yield)
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
<[email protected]<mailto:[email protected]>>:
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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