Re: [Fab-user] Running commands on multiple servers in a command

[Jorge Vargas]

On Wed, May 20, 2009 at 1:29 PM, Jeff Forcier <address@hidden> wrote:
> On Wed, May 20, 2009 at 1:06 PM, Jorge Vargas <address@hidden> wrote:
>
>> Awesome recipe it should be documented on sphinx? I wanted to switch
>> host at runtime too.
>
> Hi Jorge,
>
> Well, it's not documented yet because that's not what I want the final API to
> look like. As of right now, in fact, one could use the new (but documented, I
> think) ``settings`` context manager, i.e.::
>
>    with settings(host_string='server1'):
>        value = run('foo')
>    with settings(host_string='server2'):
>        run('bar %s' % value)
>
this works like a charm. maybe switching hosts is a common enough task
to have it's own context?

with host('server1'):
    value = run('foo')

and host will call settings?

>    $ fab deployA deployB
>
> Again, though, I want to think this sort of thing through more before I 
> declare
> any best practices. For example, you can't (currently) call the above
> deployA/deployB functions from another function, because of the way @hosts and
> friends work right now (they set an attribute on the function which is only
> read if the function is invoked directly via ``fab <function name>``.)

I don't like this idea because it means someone can run fab deployA
which means you will leave your system on a half updated state. So the
first form is more "transactional"

>
> At any rate, my older example, and the first example in this email, should 
> both
> work OK as-is. Chances are that any updates to the execution model (as in the
> previous paragraph) will occur between the 0.9 final release, and 1.0.
>
> Best,
> Jeff
>