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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Hi all,</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">As you may know, the 1.2.0 RC2 has just been tagged [1]. However, as discussed at [2], planning the migration of the repository is quite a delicate matter ; this doesn't have to be done at the same time as the release itself, but some confusion may arise if we advertise a new workflow that leads to packages that get refused from the main repo because they're not 1.1 compatible.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">We tried to improve compatibility for the next release, but for 1.2 there are just too many changes and opam 1.1 _won't_ nicely handle them. So here is how I have been preparing:</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- a batch conversion of the existing repo [7]: not required but useful for 1.2 (adding dev repos for archives held on github, setting ocamlfind deps as build-only, turning depopts constraints to conflicts [3]...). This is useful as a starting point for repo extension and example, and done using scripts in `admin-scripts/` [4]</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- a `admin-scripts/to_1_1.ml` script in opam [5] that can convert a package back to 1.1 format. I successfully tested it on the above repo and with opam 1.1 ; there may be corner cases on new 1.2 opam files that this didn't get into, but these can be caught by Travis before they break.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- updated admin scripts on the 11-bridge branch of opam.ocaml.org [6]. The new scripts create a duplicate of the repo at opam.ocaml.org/1.1/, branch version-triggered redirects between the two, and apply the above script to the 1.1 repo mirror at every update. This should make it transparent whichever opam version is used.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- tested the opam.ocaml.org scripts on a local mirror I set up, and they seem to work fine (after _a lot_ of tweaking) ; note that these can be pushed live beforehand, they'll set up the redirects but the translation script doesn't change opam files with `opam-version` < "1.2" so it won't cause any user-visible changes until we actually accept 1.2 opam files in the repo (except for the "permanently redirected" message)</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">What remains to do:</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- setup the opam-repository travis scripts to apply the 1.1 rewrite before testing, for opam versions < 1.2. Only tricky part is to get hold of a recent enough opam-lib to run the script (maybe we could cheat and put a standalone bytecode exe on opam-repository for that ; well one for 4.01 and one for 4.02 since the format changed...). This way PRs to opam-repo containing 1.2 opam files will be correctly tested, as well as the rewrite.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">- release !</p>
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<p style="-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; "> </p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Finally, note that I'll be moving across the globe next week, and won't be available for two weeks or so. Everything should be ready to release as soon as I get back.</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Cheers,</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">Louis</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[1] https://github.com/ocaml/opam/releases/tag/1.2.0-rc2</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[2] https://github.com/ocaml/opam/issues/1662</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[3] https://github.com/ocaml/opam/pull/1325</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[4] https://github.com/ocaml/opam/tree/master/admin-scripts</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[5] https://github.com/ocaml/opam/pull/1743</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[6] https://github.com/ocaml/opam.ocaml.org/tree/11-bridge</p>
<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">[7] https://github.com/ocaml/opam-repository/tree/1.2-test</p>
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<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; -qt-user-state:0;">PS: during the course of these tests, I sadly found out that repo redirect handling in 1.1 wasn't that good: it works at update but not straight-away at init. See comment at https://github.com/ocaml/opam/pull/1744</p></body></html>