[opam-devel] [ocaml-platform] OPAM 1.1.1 RC

[Gabriel Scherer]

In the future it may be worth thinking about format versioning, so
that next-version server can apply an adaptation layer when talking to
previous-version clients.

On Wed, Jan 15, 2014 at 10:27 AM, Louis Gesbert
<louis.gesbert at ocamlpro.com> wrote:
> On Tuesday 14 January 2014 17:34:55 Anil Madhavapeddy wrote:
>> On 14 Jan 2014, at 17:11, Louis Gesbert <louis.gesbert at ocamlpro.com> 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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