On Tue, Dec 13, 2011 at 2:58 PM, Geoff Crompton
<[email protected]> wrote:
> How do I make fabric run some python code at the end of it's execution to do
> json.dump(unames)?
Right now there are no "hooks" to run after everything completes
(module-level code serves as a de facto "before" hook, though) so
you'd need to do one of two things:
A) Write a 2nd, 'local only' task decorated with @runs_once that does
the Python work needed, e.g. persisting your dict to disk:
def get_uname():
# update unames
@runs_once
def persist():
with open('myfile.txt', 'w') as fd:
fd.write(str(unames))
and run as:
$ fab -H my,host,list get_uname persist
'persist' will run once only, at the end.
B) Use execute() with a specific host list argument, instead of using
global host lists set as env.hosts or via -H, from a 'wrapper' task:
myhosts = ['my', 'host', 'list']
def _get_uname():
# update unames
def get_uname():
execute(_get_uname, hosts=myhosts)
# persist to disk here
Invoke as:
$ fab get_uname
These are the current methods for splitting execution between a "runs
many times" per-host subroutine, and a "runs once" local-work
subroutine. Hope it helps.
-Jeff
--
Jeff Forcier
Unix sysadmin; Python/Ruby engineer
http://bitprophet.org
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