Juju 2.1.0, and Conjure-up, are here!

[Mark Shuttleworth]

On 24/02/17 11:30, Andrew Wilkins wrote:
> On Fri, Feb 24, 2017 at 6:15 PM Adam Collard
> <adam.collard at canonical.com <mailto:adam.collard at canonical.com>> wrote:
>
>     On Fri, 24 Feb 2017 at 10:07 Adam Israel
>     <adam.israel at canonical.com <mailto:adam.israel at canonical.com>> wrote:
>
>         Thanks for calling this out, Simon! We should be shouting this
>         from the rooftops and celebrating in the streets.
>
>
>     Only if you also wave a big WARNING banner!
>
>     I can definitely see value in pre-installing a bunch of things in
>     your LXD images as a way of speeding up the development/testing
>     cycle, but doing so might give you false confidence in your charm.
>     It will become much easier to forget to list a package that you
>     need installing,  or to ensure that you have the correct access
>     (PPA credentials, or proxy details etc.) and having your charm
>     gracefully handle when those are missing.
>
>     Juju promises charms encoding operations that can work across
>     multiple cloud providers, bare metal and containers please keep
>     that in mind :)
>
>
> Indeed, and this is the reason why it wasn't called out. We probably
> should document it for power-users/charmers, but in general I wouldn't
> go encouraging its use. Optimising for LXD is great for repeat
> deploys, but it wouldn't be great if that leads to less attention to
> quality on the rest of the providers.
>  
> Anyway, I'm glad it's helping make charmers' lives easier!

We should call this out loudly because it helps people making charms.

Those people are plenty smart enough to debug a failure if they forget a
dependency which was preinstalled in their dev images.

Don't HIDE something that helps developers for fear of those developers
making mistakes, TEACH them to put CI or other out-of-band tests in
place anyway that will catch that every time.

Mark
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