[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Fab-user] Providing a fallback for roles at runtime
From: |
Michael Gliwinski |
Subject: |
Re: [Fab-user] Providing a fallback for roles at runtime |
Date: |
Thu, 19 Dec 2013 11:33:25 +0000 |
User-agent: |
KMail/4.7.3 (Linux/3.0.0-32-generic; KDE/4.7.4; x86_64; ; ) |
On Thursday 19 Dec 2013 08:44:15 Paul Walsh wrote:
...
> "execute this task on db if db is in roles, otherwise, execute on default."
>
> So, to achieve that, I tried:
>
> import utilities
>
> @roles(utilities.get_role('db'))
> @task
> def drop():
> utilities.alert(u'Dropping the database.')
> run('dropdb {name}'.format(name=env.db_name))
>
>
> # utilities.py
> def get_role(target_role):
> if target_role in env.roles:
> return target_role
> else:
> return 'default'
>
>
> However, the task still attempts to run on roles['default']. I'm diving in
> but I'm also wondering if there is another way I could, in the fabfile
> itself, dynamically set the role for a task like this.
I'm not sure how you set env.roles, but note that utilities.get_role will be
executed when your fabfile is loaded.
Roles can actually be callables, so you could do something like:
def db_or_default():
if ...: return ['5.6.7.8']
return env.roledefs['default']
env.roledefs = {'default': ['1.2.3.4'], 'db': db_or_default}
**********************************************************************************************
The information in this email is confidential and may be legally privileged.
It is intended solely for the addressee and access to the email by anyone else
is unauthorised.
If you are not the intended recipient, any disclosure, copying, distribution or
any action taken or omitted to be taken in reliance on it, is prohibited and
may be unlawful.
When addressed to our clients, any opinions or advice contained in this e-mail
are subject to the terms and conditions expressed in the governing client
engagement leter or contract.
If you have received this email in error please notify address@hidden
John Henderson (Holdings) Ltd
Registered office: 9 Hightown Avenue, Mallusk, County Antrim, Northern Ireland,
BT36 4RT.
Registered in Northern Ireland
Registration Number NI010588
Vat No.: 814 6399 12
*********************************************************************************