Datasource Fallbacks (simplestreams)

[Andrew Wilkins]

On Fri, Oct 4, 2013 at 9:24 PM, Curtis Hovey-Canonical <curtis at canonical.com
> wrote:

> 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.
>

Not a warning, because it's not necessarily unexpected. The code currently
logs a DEBUG level message if it can't find product (image, tools)
information from a source.

Cheers,
Andrew


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