Datasource Fallbacks (simplestreams)

[Curtis Hovey-Canonical]

Do we place a specific warning in the log. If I bootstrap with
--show-log, do I see a message that clearly states the image cannot be
found and and that Juju is falling back? I want to know if I have
misconfigured something.

On Fri, Oct 4, 2013 at 6:24 AM, William Reade
<william.reade at canonical.com> wrote:
> Yeah, let's go with always-fall-back. Much more likely to be useful in
> general, and we can worry about masking off the rest of the world if there's
> a clear need for it that can't be easily addressed outside juju (if the
> environment can't see a stream, it won't be able to fall back to it ;)).
>
>
> On Fri, Oct 4, 2013 at 11:26 AM, Jeroen Vermeulen
> <jeroen.vermeulen at canonical.com> wrote:
>>
>> On 04/10/13 12:26, John Arbash Meinel wrote:
>>
>>> We came to this because the Azure provider was adding the "daily"
>>> stream to the search path. Which meant that we would find the daily
>>> stream, parse it, not find anything and then stop. Without falling
>>> back to the releases stream which has the actual entries we are
>>> looking for. (We "solved" this by just removing the daily stream,
>>> which was also for other reasons.)
>>
>>
>> I did that, IIRC at a time when only the daily images worked yet but
>> releases were the obvious long-term way to go.
>>
>> The implied contract for the imagemetadata package seemed to be that it
>> would consider only the selected stream, and ignore any other streams it
>> found in the search path.  From what you say, that's what Andrew
>> implemented.  Otherwise, what's the point of supporting a search path
>> consisting of multiple URLs?
>>
>> With the fallback, having both the daily and the release stream in the
>> path allows users to select one or the other by setting just a stream name —
>> no messing with simplestreams URLs in the most common case.
>>
>>
>>
>> Jeroen
>>
>>
>> --
>> Juju-dev mailing list
>> Juju-dev at lists.ubuntu.com
>> Modify settings or unsubscribe at:
>> https://lists.ubuntu.com/mailman/listinfo/juju-dev
>
>
>
> --
> Juju-dev mailing list
> Juju-dev at lists.ubuntu.com
> Modify settings or unsubscribe at:
> https://lists.ubuntu.com/mailman/listinfo/juju-dev
>



-- 
Curtis Hovey
Canonical Cloud Development and Operations
http://launchpad.net/~sinzui