Proposed API Change - Get default repo/namespace from environment variable.

[Gustavo Niemeyer]

> I think we've discussed this before, but how does one infer the series
> without the default-series in environments.yaml?

Indeed, we did: https://bugs.launchpad.net/juju/+bug/886364

The reasonable choices for bootstrapping an environment are either:

a) The last LTS
b) The Ubuntu running the juju command

After that, every other command should default to the series that
originally bootstrapped the environment.

> So, while I support getting rid of the hard requirement, I think the
> user experience needs to be carefully changed to guide users to the
> correct behavior they desire.

Cool, so we're in agreement.

> That said, I agree with your proposed solution, and don't think this
> will be inviting conflicts. We simply should make it required in all
> charm operations if it is not specified in environments.yaml or the
> environment variable.

I didn't propose that. No matter what we do, this command must
continue to work out of the box:

    juju deploy mongodb

-- 
Gustavo Niemeyer
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-- I'm not absolutely sure of anything.