Port to OCaml 4.12 #408

AltGr · 2021-07-28T11:24:46Z

The Docker targets and CI scripts are probably going to need some more
work, but compiling the base application and test exercises already
works. Testers welcome!

See ocaml-sf/learn-ocaml#408 to test

idkjs · 2021-07-29T16:29:55Z

Testers welcome!

How do you run this to test?

The docker command seems to not work

❯ docker run --rm \
        -v .:/repository:ro \
        -v learn-ocaml-sync:/sync \
        -p 80:8080 --name learn-ocaml-server \
        ocamlsf/learn-ocaml:master
docker: invalid reference format.

erikmd · 2021-07-29T19:30:52Z

Testers welcome!

How do you run this to test?

The docker command seems to not work

❯ docker run --rm \
        -v .:/repository:ro \
        -v learn-ocaml-sync:/sync \
        -p 80:8080 --name learn-ocaml-server \
        ocamlsf/learn-ocaml:master
docker: invalid reference format.

At first sight, it's because of your -v option, because one must use absolute paths here ($PWD and not .).

This would lead to:

sudo docker run --rm -v "$PWD:/repository:ro" -v learn-ocaml-sync:/sync -p 80:8080 ocamlsf/learn-ocaml:master

BTW I've removed the --name learn-ocaml-server argument as it is a bit useless in presence of --rm.

However, note that by running this command, you'd not get the intended goal of testing this PR here, because ocamlsf/learn-ocaml:master just refers to the master branch of learn-ocaml, while PR #408 refers to the ocaml-412-port branch.

Just FTR, the date of the last push to Docker Hub of the master branch is mentioned here:
https://hub.docker.com/r/ocamlsf/learn-ocaml

erikmd · 2021-07-29T19:39:39Z

@idkjs so to fully address your question:

How do you run this to test?

The basic answer is: by checking-out the PR (see item 1. below) and compiling it (see item 2. below);

admittedly we could have arranged some CI/CD config to automatically deploy another image (as "pre-prod") while the PR is not yet ready (like I did for another PR in pfitaxel@18da153),
but I dunno if this would be useful for PR #408…

How to test this PR

Install the git-pr extra Git command,
then do git clone https://github.com/ocaml-sf/learn-ocaml.git && cd learn-ocaml && git pr 408
Compile Learn-OCaml using opam/ocaml.4.12/make (direct link to the doc Manual compilation)
Run something like learn-ocaml build serve --repo="$PWD/demo-repository" --port 80

erikmd · 2021-07-29T20:01:08Z

Dockerfile

@@ -68,7 +68,7 @@ WORKDIR /home/learn-ocaml

 COPY --from=compilation /home/opam/install-prefix /usr

-ENTRYPOINT ["dumb-init","learn-ocaml","--sync-dir=/sync","--repo=/repository"]
+ENTRYPOINT ["dumb-init","/usr/bin∕learn-ocaml","--sync-dir=/sync","--repo=/repository"]


Hi @AltGr, I believe I understood why the CI failed (it seems a weird but very funny explanation :)
The 3rd slash in this diff is not a true slash:

So the fix should just be:

Suggested change

ENTRYPOINT ["dumb-init","/usr/bin∕learn-ocaml","--sync-dir=/sync","--repo=/repository"]

ENTRYPOINT ["dumb-init","/usr/bin/learn-ocaml","--sync-dir=/sync","--repo=/repository"]

(feel free to force-push)

Indeed! I finally found it before seeing your message 😅 how could that ever have happened ?
As mentionned in the first comment, the Docker containers weren't fixed yet, but now it should be ok.

Last CI failure is because ocaml-sf/learn-ocaml-corpus#32 would need merging first (but in its current state it would break the corpus on released learn-ocaml :/ )

how could that ever have happened ?

I think that's because this character may be associated to a keybinding very close to Shift+/:
with my keyboard config, it is AltGr+Shift+/

Last CI failure is because ocaml-sf/learn-ocaml-corpus#32 would need merging first

OK, thanks for opening this other PR!

(but in its current state it would break the corpus on released learn-ocaml :/ )

Oh, that's unfortunate… would you have ideas to overcome this? I mean:

Keeping the whole learn-ocaml-corpus run within learn-ocaml's CI;

Make it pass for both learn-ocaml.0.12 and learn-ocaml@master ?

How did this happen? I thought I was going mad for a moment

dune no longer accepts manually setting `-custom` and doesn't allow us to set complete bytecode binaries to be installed :/ (see ocaml/dune#4837) it seems this combination with manual install is the only layout that allows normal and static linking to work...

idkjs · 2021-07-30T12:11:22Z

2\. Compile Learn-OCaml using `opam`/`ocaml.4.12`/`make` [(direct link to the doc `Manual compilation`)](https://ocaml-sf.org/learn-ocaml/howto-deploy-a-learn-ocaml-instance.html#manual-compilation)

Here is an error I am getting running the second command:

~/Github/learn-ocaml pr/408                        ✘ 99  3.0.1
❯ opam switch create . --deps-only && opam install opam-installer && eval (opam env)

<><> Installing new switch packages ><><><><><><><><><><><>  🐫
Switch invariant: ["ocaml" {>= "4.05.0"}]
[ERROR] Could not determine which packages to install for this
        switch:
  * No agreement on the version of ocaml:
    - learn-ocaml → asak → ocaml < 4.09.0
    - learn-ocaml-client → ocaml = 4.12.0

❯ git show
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
commit 82cea091b6af6e4d961b86607ae264d4f7e44ce2 (HEAD -> pr/408
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Author: Louis Gesbert <[email protected]>
Date:   Thu Jul 29 15:51:08 2021 +0200

    Fix linking

    dune no longer accepts manually setting `-custom` and doesn
    complete bytecode binaries to be installed :/ (see
    https://github.com/ocaml/dune/pull/4837)

    it seems this combination with manual install is the only l
    normal and static linking to work...

FYI. Happy to test. Standing by for instructions.

Thanks for all you do!

AltGr · 2021-07-30T12:19:46Z

You need to run opam update, the compatible version of asak was just released (at my request, see nobrakal/asak#4 :) )

idkjs · 2021-07-30T12:53:52Z

You need to run opam update, the compatible version of asak was just released (at my request, see nobrakal/asak#4 :) )

Looks like ocamlres is not known to opam and num package fails to install. Here are the next steps taken:

Details

...
Hint: try:
  opam install asak base64 checkseum cohttp-lwt cohttp-lwt-unix conduit decompress digestif ezjsonm gg js_of_ocaml js_of_ocaml-compiler js_of_ocaml-lwt js_of_ocaml-ppx js_of_ocaml-tyxml lwt lwt_react magic-mime markup markup-lwt ocaml-migrate-parsetree ocp-indent-nlfork ocplib-json-typed ocplib-json-typed-browser ocplib-ocamlres omd ppx_tools vg

~/Github/learn-ocaml pr/408                              3.0.1
❯ opam install asak base64 checkseum cohttp-lwt cohttp-lwt-unix conduit decompress digestif ezjsonm gg js_of_ocaml js_of_ocaml-compiler js_of_ocaml-lwt js_of_ocaml-ppx js_of_ocaml-tyxml lwt lwt_react magic-mime markup markup-lwt ocaml-migrate-parsetree ocp-indent-nlfork ocplib-json-typed ocplib-json-typed-browser ocplib-ocamlres omd ppx_tools vg
[ERROR] No package named ocplib-ocamlres found.

~/Github/learn-ocaml pr/408                         ✘ 5  3.0.1
❯ opam install asak base64 checkseum cohttp-lwt cohttp-lwt-unix conduit decompress digestif ezjsonm gg js_of_ocaml js_of_ocaml-compiler js_of_ocaml-lwt js_of_ocaml-ppx js_of_ocaml-tyxml lwt lwt_react magic-mime markup markup-lwt ocaml-migrate-parsetree ocp-indent-nlfork ocplib-json-typed ocplib-json-typed-browser omd ppx_tools vg
...

# Run eval (opam env) to update the current shell environment

The former state can be restored with:
    /usr/local/bin/opam switch import
"/Users/mando/Github/learn-ocaml/_opam/.opam-switch/backup/state-20210730124425.export"

~/Github/learn-ocaml pr/408                 ✘ 31 2m 16s  3.0.1
❯ eval (opam env)

~/Github/learn-ocaml pr/408                              3.0.1
❯ make && make opaminstall
make[2]: Nothing to be done for `all'.
File "src/ppx-metaquot/ppx_metaquot_main.ml", line 2, characters 2-35:
2 |   Migrate_parsetree.Driver.register ~name:"ppx_metaquot" (module Migrate_parsetree.OCaml_412)
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Unbound module Migrate_parsetree.Driver
File "src/repo/learnocaml_exercise.ml", line 321, characters 6-28:
321 |     | Omd_representation.Url(href,s,title) ->
            ^^^^^^^^^^^^^^^^^^^^^^
Error: Unbound module Omd_representation
File "src/utils/ppx_ocplib_i18n.ml", line 14, characters 5-18:
14 | open OCaml_405.Ast
          ^^^^^^^^^^^^^
Error: Unbound module OCaml_405
File "src/grader/dune", line 6, characters 13-34:
6 |  (preprocess (pps ppx_ocplib_i18n))
                 ^^^^^^^^^^^^^^^^^^^^^
Error: No ppx driver were found.
Hint: Try upgrading or reinstalling ocaml-migrate-parsetree.
File "src/grader/dune", line 33, characters 13-42:
33 |  (preprocess (pps learnocaml_ppx_metaquot))
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: No ppx driver were found.
Hint: Try upgrading or reinstalling ocaml-migrate-parsetree.
File "src/grader/dune", line 126, characters 41-53:
126 |  (action (with-stdout-to %{targets} (run ocp-ocamlres -format ocamlres %{stdlib_cmis} %{local_cmis} %{lib_cmis})))
                                               ^^^^^^^^^^^^
Error: Program ocp-ocamlres not found in the tree or in PATH
 (context: default)
File "src/grader/dune", line 134, characters 12-35:
134 |  (libraries ocplib-ocamlres.runtime bigarray
                  ^^^^^^^^^^^^^^^^^^^^^^^
Error: Library "ocplib-ocamlres.runtime" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/grader/dune", line 158, characters 16-28:
158 |            (run ocp-ocamlres -format ocamlres %{compiler-cmis} %{generated-cmis})))
                      ^^^^^^^^^^^^
Error: Program ocp-ocamlres not found in the tree or in PATH
 (context: default)
File "src/grader/dune", line 168, characters 12-35:
168 |             ocplib-ocamlres.runtime
                  ^^^^^^^^^^^^^^^^^^^^^^^
Error: Library "ocplib-ocamlres.runtime" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/grader/dune", line 174, characters 26-71:
174 |  (preprocess (per_module ((pps ppx_ocplib_i18n learnocaml_ppx_metaquot) Grading)))
                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: No ppx driver were found.
Hint: Try upgrading or reinstalling ocaml-migrate-parsetree.
File "src/grader/dune", line 184, characters 12-27:
184 |             ocplib-ocamlres
                  ^^^^^^^^^^^^^^^
Error: Library "ocplib-ocamlres" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/main/dune", line 43, characters 12-27:
43 |             cohttp-lwt-unix
                 ^^^^^^^^^^^^^^^
Error: Library "cohttp-lwt-unix" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/server/dune", line 14, characters 12-22:
14 |             decompress
                 ^^^^^^^^^^
Error: Library "decompress" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/state/dune", line 25, characters 12-19:
25 |             conduit
                 ^^^^^^^
Error: Library "conduit" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/toplevel/dune", line 21, characters 12-35:
21 |             ocplib-ocamlres.runtime
                 ^^^^^^^^^^^^^^^^^^^^^^^
Error: Library "ocplib-ocamlres.runtime" not found.
Hint: try:
  dune external-lib-deps --missing --profile release @@default
File "src/utils/dune", line 14, characters 13-34:
14 |  (preprocess (pps ppx_ocplib_i18n))
                  ^^^^^^^^^^^^^^^^^^^^^
Error: No ppx driver were found.
Hint: Try upgrading or reinstalling ocaml-migrate-parsetree.
make: *** [build] Error 1

~/Github/learn-ocaml pr/408                      ✘ 2 5s  3.0.1
❯ dune external-lib-deps --missing --profile release @@default
Error: The following libraries are missing in the default context:
- cohttp-lwt-unix
- conduit
- decompress
- ocplib-ocamlres
- ocplib-ocamlres.runtime
Hint: try:
  opam install cohttp-lwt-unix conduit decompress ocplib-ocamlres

~/Github/learn-ocaml pr/408                              3.0.1
❯ opam install cohttp-lwt-unix conduit decompress ocplib-ocamlres
[ERROR] No package named ocplib-ocamlres found.

~/Github/learn-ocaml pr/408                         ✘ 5  3.0.1
❯ opam install cohttp-lwt-unix conduit decompress
[NOTE] Package decompress is already installed (current
       version is 1.4.1).
The following actions will be performed:
  ∗ install num              1.4     [required by sexplib]
  ∗ install sexplib          v0.14.0 [required by conduit]
  ∗ install mirage-crypto-pk 0.10.3  [required by x509]
  ∗ install conduit          4.0.0
  ∗ install x509             0.14.0  [required by ca-certs]
  ∗ install conduit-lwt      4.0.0
          [required by cohttp-lwt-unix]
  ∗ install ca-certs         0.2.1
          [required by conduit-lwt-unix]
  ∗ install conduit-lwt-unix 4.0.0
          [required by cohttp-lwt-unix]
  ∗ install cohttp-lwt-unix  4.0.0
===== ∗ 9 =====
Do you want to continue? [Y/n] y

<><> Processing actions ><><><><><><><><><><><><><><><><><>  🐫
⬇ retrieved ca-certs.0.2.1  (cached)
⬇ retrieved conduit.4.0.0  (cached)
⬇ retrieved conduit-lwt.4.0.0  (cached)
⬇ retrieved conduit-lwt-unix.4.0.0  (cached)
⬇ retrieved cohttp-lwt-unix.4.0.0  (cached)
⬇ retrieved num.1.4  (cached)
⬇ retrieved x509.0.14.0  (cached)
⬇ retrieved sexplib.v0.14.0  (cached)
⬇ retrieved mirage-crypto-pk.0.10.3  (cached)
[ERROR] The installation of num failed at "make
        findlib-install".

#=== ERROR while installing num.1.4 ==========================#
# context     2.1.0~rc2 | macos/x86_64 |  | https://opam.ocaml.org#12525fc3
# path        ~/Github/learn-ocaml/_opam/.opam-switch/build/num.1.4
# command     ~/.opam/opam-init/hooks/sandbox.sh install make findlib-install
# exit-code   2
# env-file    ~/.opam/log/num-33897-322c5d.env
# output-file ~/.opam/log/num-33897-322c5d.out
### output ###
# /Applications/Xcode.app/Contents/Developer/usr/bin/make -C src findlib-install
# sed -e '/\^/d' -e 's/%%VERSION%%/1.4/g' META.in > META
# ocamlfind install num META nums.cma libnums.a big_int.cmi nat.cmi num.cmi ratio.cmi arith_status.cmi big_int.mli nat.mli num.mli ratio.mli arith_status.mli big_int.cmti nat.cmti num.cmti ratio.cmti arith_status.cmti nums.cmxa nums.a int_misc.cmx nat.cmx big_int.cmx arith_flags.cmx ratio.cmx num.cmx arith_status.cmx nums.cmxs dllnums.so
# ocamlfind: Package num is already installed
#  - (file /Users/mando/Github/learn-ocaml/_opam/lib/num/META already exists)
# make[1]: *** [findlib-install] Error 2
# make: *** [findlib-install] Error 2

AltGr · 2021-07-30T15:58:30Z

opam install asak  [...]

the package is ocp-ocamlres. But you don't need to list manually, just run opam install . --deps-only !

Ailrun · 2021-09-01T20:40:46Z

Is there any progress on this PR?

erikmd · 2021-09-01T21:49:24Z

Is there any progress on this PR?

Thanks @Ailrun for your comment!

Basically, there are only two reasons for not merging this PR right away (but these shouldn't delay the process that much):

The CI is broken,
and we are currently thinking about "the ideal order" for merging several on-going PRs, including this one.

More precisely:

For 1., the issue is that the CI relies on running learn-ocaml on the whole learn-ocaml-corpus, which fails because of the reason explained in the comments above. If we fix the learn-ocaml-corpus, there are "chances" that learn-ocaml-corpus itself will be broken for people still using the last release of learn-ocaml (0.12) or previous versions. Unless we find an elegant fix, of course (I mean, a backward-compatible fix).

For 2., I have personally no objections for merging #408 quickly (once 1. is fixed)… except that doing that, each PR we'd like to ship in learn-ocaml 0.13 would need very similar tweaks (merge + compatibility fixes for the .opam files, etc.), while it may be simpler to merge the few other PRs, then rebase #408 😅 (which only contains 7 commits).

Ailrun · 2021-09-01T21:53:53Z

I see, thank you for the detailed explanation! I really look forward to use this new version for courses.

erikmd · 2021-09-01T21:58:23Z

For 2., I have personally no objections for merging #408 quickly (once 1. is fixed)… except that doing that, each PR we'd like to ship in learn-ocaml 0.13 would need very similar tweaks (merge + compatibility fixes for the .opam files, etc.), while it may be simpler to merge the few other PRs, then rebase #408 sweat_smile (which only contains 7 commits).

FTR, we had already decided that #408 will be merged and released before #362 is merged and released.

And given many classes may want to rely on learn-ocaml as from the Autumn term, I sincerely hope that a new release could be shipped by September 15.

I think I'll open a meta-issue summarizing the release plan we had thought about with Yann lately… and which just needs to be refined a bit.

erikmd · 2021-09-01T22:04:16Z

BTW @AltGr, do you agree with that suggestion:

For 2., I have personally no objections for merging #408 quickly (once 1. is fixed)… except that doing that, each PR we'd like to ship in learn-ocaml 0.13 would need very similar tweaks (merge + compatibility fixes for the .opam files, etc.), while it may be simpler to merge the few other PRs, then rebase #408 sweat_smile (which only contains 7 commits).

or do you believe that "rebasing #408 after merging several PRs" would be more tricky and not worth waiting for?

in which case, no worries, we could merge #408 sooner…

AltGr · 2021-09-14T15:19:55Z

I don't think it will interfere too much with other PRs and should be merged as soon as possible, this has already been stalled for quite long. Note that the number of commits shouldn't matter too much for the order, but the number of affected files (and the "liveness" of these files) is a more important concern; people have different practices but for long-standing branches with lots of commits it's often more reasonable to use merges rather than rebases (I do always prefer rebases for my work branches, but sometimes they just become unnecessarily tedious. I really disapprove reverse merges from master into work branches though!)

As for the CI, there is no reason not to merge https://github.com/ocaml-sf/learn-ocaml-corpus/pull/32/files , it's backwards-compatible with 4.05 and should fix this.

See ocaml-sf/learn-ocaml#408 to test

erikmd · 2021-09-15T13:54:47Z

Thank you @AltGr! so @yurug just merged ocaml-sf/learn-ocaml-corpus#32 and I'm closing/reopening this PR to restart the CI.

AltGr added 4 commits July 28, 2021 09:28

Cleanup obsolete ocp-build files

4be47cd

Upgrade ppx-metaquot from upstream

b66cf2c

Port to OCaml 4.12

2ac5c54

Debug add env var LEARNOCAML_SERVER_NOCACHE to disable all http caching

66994f2

AltGr added a commit to AltGr/learn-ocaml-corpus that referenced this pull request Jul 28, 2021

Fix for recent ocaml (immutable strings)

8b19fdb

See ocaml-sf/learn-ocaml#408 to test

AltGr force-pushed the ocaml-412-port branch 2 times, most recently from 2961a83 to 19e7438 Compare July 28, 2021 14:01

AltGr mentioned this pull request Jul 28, 2021

Support newer version of OCaml #387

Closed

AltGr force-pushed the ocaml-412-port branch from 19e7438 to d4660d9 Compare July 28, 2021 14:12

EmileRolley added the kind: enhancement Enhancement to an existing user-facing feature. label Jul 28, 2021

AltGr force-pushed the ocaml-412-port branch 2 times, most recently from 46c6ce9 to bf8fe96 Compare July 29, 2021 14:54

Fixes for Docker and CI

c9c77a9

AltGr force-pushed the ocaml-412-port branch from bf8fe96 to 145d15e Compare July 29, 2021 16:14

erikmd reviewed Jul 29, 2021

View reviewed changes

AltGr added 2 commits July 30, 2021 10:55

Worst typo ever

c704ef5

How did this happen? I thought I was going mad for a moment

Fix linking

82cea09

dune no longer accepts manually setting `-custom` and doesn't allow us to set complete bytecode binaries to be installed :/ (see ocaml/dune#4837) it seems this combination with manual install is the only layout that allows normal and static linking to work...

AltGr force-pushed the ocaml-412-port branch from 145d15e to 82cea09 Compare July 30, 2021 08:56

AltGr mentioned this pull request Jul 30, 2021

Move the toplevel buttons to the bottom-right #409

Merged

yurug pushed a commit to ocaml-sf/learn-ocaml-corpus that referenced this pull request Sep 15, 2021

Fix for recent ocaml (immutable strings)

5323b7d

See ocaml-sf/learn-ocaml#408 to test

erikmd closed this Sep 15, 2021

erikmd reopened this Sep 15, 2021

erikmd merged commit 34f04af into ocaml-sf:master Sep 15, 2021

erikmd mentioned this pull request Sep 15, 2021

meta-issue: learn-ocaml 0.13.0 release plan and milestones suggestions for upcoming releases #418

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erikmd added this to the learn-ocaml 0.13 milestone Sep 15, 2021

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erikmd mentioned this pull request Feb 7, 2025

Task: revert 82cea09 somehow? #606

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Port to OCaml 4.12 #408

Port to OCaml 4.12 #408

AltGr commented Jul 28, 2021

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	ENTRYPOINT ["dumb-init","/usr/bin∕learn-ocaml","--sync-dir=/sync","--repo=/repository"]
	ENTRYPOINT ["dumb-init","/usr/bin/learn-ocaml","--sync-dir=/sync","--repo=/repository"]

Port to OCaml 4.12 #408

Port to OCaml 4.12 #408

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AltGr commented Jul 28, 2021

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How to test this PR

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