On Tuesday 14 January 2014 17:34:55 Anil Madhavapeddy wrote:
> On 14 Jan 2014, at 17:11, Louis Gesbert <[email protected]> wrote:
> 
> > Last addition was the possibility for packagers to specify `archive: 
> > ["upstream-url" "mirror1" "mirror2"]` in the url files, so that we have a 
> > way to circumvent downtime of package hosting servers -- like recently 
> > happened for camlcity with dire consequences for new OPAM installations 
> > (ocamlfind could not be installed). We are working on a more general 
> > mirroring solution for the next release.
> 
> I don't think this should be included in 1.1.1, since it changes the 
> repository format.  For instance, is there a clear backwards compatibility 
> story for 1.1.0 clients that connect to a repository that includes multiple 
> archives?

Indeed, that would break (quite badly) -- Thomas thought that the url file 
already supported (unused) archive lists, but that must have been removed at 
some point.
If it's very important to have this now, I can modify the patch so that it only 
changes the repo in a 1.1.0-compatible way, by adding a `mirror` field instead 
of changing the current type of the `archive` and similar fields. I tend to 
think that the smoothness of upgrade may be worth the slightly less clear 
resulting file format.

Any opinions on this ? The problem still exists even if we shift that after 
release.

Cheers,
Louis
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