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

Louis Gesbert louis.gesbert at ocamlpro.com
Wed Jan 15 09:27:54 GMT 2014

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.


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