New feature for charmers - min-juju-version

[Rick Harding]

Thanks Nate, great stuff. I know there's a lot of folks looking forward to
this helping our charming community out as we fill out the model more and
charms get to adapt and move forward.

On Thu, Mar 17, 2016 at 6:35 PM Nate Finch <nate.finch at canonical.com> wrote:

> Yes, it'll be ignored, and the charm will be deployed normally.
>
> On Thu, Mar 17, 2016 at 3:29 PM Ryan Beisner <ryan.beisner at canonical.com>
> wrote:
>
>> This is awesome.  What will happen if a charm possesses the flag in
>> metadata.yaml and is deployed with 1.25.x?  Will it gracefully ignore it?
>>
>> On Thu, Mar 17, 2016 at 1:57 PM, Nate Finch <nate.finch at canonical.com>
>> wrote:
>>
>>> There is a new (optional) top level field in the metadata.yaml file
>>> called min-juju-version. If supplied, this value specifies the minimum
>>> version of a Juju server with which the charm is compatible. When a user
>>> attempts to deploy a charm (whether from the charmstore or from local) that
>>> has min-juju-version specified, if the targeted model's Juju version is
>>> lower than that specified, then the user will be shown an error noting that
>>> the charm requires a newer version of Juju (and told what version they
>>> need). The format for min-juju-version is a string that follows the same
>>> scheme as our release versions, so you can be as specific as you like. For
>>> example, min-juju-version: "2.0.1-beta3" will deploy on 2.0.1 (release),
>>> but will not deploy on 2.0.1-alpha1 (since alpha1 is older than beta3).
>>>
>>> Note that, at this time, Juju 1.25.x does *not* recognize this flag, so
>>> it will, unfortunately, not be respected by 1.25 environments.
>>>
>>> This code just landed in master, so feel free to give it a spin.
>>>
>>> -Nate
>>>
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