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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