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+1 to the "permanence order" change
 
I think it's important we keep something like this as simple as possible. So I'm against taking CLI argument order into account or having a flag that changes how it works. The more rules we put into this behavior the more confusing it will be for deployers and users. As for backward compat, I do believe it to be a version thing because some sort of middle ground doesn't make sense here.
 
-Alex
 
-----Original Message-----
From: "Flavio Percoco" <flavio at redhat.com>
Sent: Tuesday, May 7, 2013 4:44pm
To: "Mark McLoughlin" <markmc at redhat.com>, "OpenStack Development Mailing List" <openstack-dev at lists.openstack.org>
Subject: Re: [openstack-dev] [Oslo] Give CLI the priority over config files



On 07/05/13 17:29 +0100, Mark McLoughlin wrote:
>On Fri, 2013-05-03 at 10:25 -0400, Monty Taylor wrote:
>> I agree. I believe the natural order of things is:
>>
>> - Default value in source code
>> - Overridden by value in config file
>> - Overridden by value in environment variable
>> - Overridden by value given as command line option
>>
>> Basically due to the relative permanence of each.
>
>The "permanence order" seems reversed in the case  of tools like
>nova-manage. So, maybe the solution is to have a flag which specifies
>the order and CLIs like nova-manage would set that flag, but the
>behaviour of services would stay the same.

While I see the issues here, I still think this change should happen.
A way to keep backward compatibility would be to pinned (don't kill
me) stable branches and let his change land.

I thought a bit more about the flag and I don't think having it is a
good idea. TBH, I'd be ok with it if the default behavior is giving
priority to the CLI and the flag just reverses that but, I'd
definitely prefer not having it. There should be just one way to
manage configs and CLI arguments, IMHO.

Cheers,
FF

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