(for PR #27920)

2025-10-17 13:54.09: New job: build ocaml-fsrs.0.1.0-alpha3, using opam dev
                              from https://github.com/ocaml/opam-repository.git#refs/pull/27920/head (67423ee84b72a0a7e34b6e84fbb039f220f355cd)
                              on macos-homebrew-ocaml-5.4/arm64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/27920/head" && git reset --hard 67423ee8
git fetch origin master
git merge --no-edit 5bf570252bd9fee71938b828ca0b86573c1e3355
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM macos-homebrew-ocaml-5.4
USER 1000:1000
RUN ln -f ~/local/bin/opam-dev ~/local/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url -k local --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn ocaml-fsrs.0.1.0-alpha3 0.1.0-alpha3
RUN opam reinstall ocaml-fsrs.0.1.0-alpha3; \
    res=$?; \
    test "$res" != 31 && exit "$res"; \
    export OPAMCLI=2.0; \
    build_dir=$(opam var prefix)/.opam-switch/build; \
    failed=$(ls "$build_dir"); \
    partial_fails=""; \
    for pkg in $failed; do \
    if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"macos-homebrew\""; then \
    echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field."; \
    fi; \
    test "$pkg" != 'ocaml-fsrs.0.1.0-alpha3' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1

END-OF-DOCKERFILE
docker build -f ../Dockerfile .

2025-10-17 13:54.09: Using cache hint "macos-homebrew-ocaml-5.4-ocaml-fsrs.0.1.0-alpha3-67423ee84b72a0a7e34b6e84fbb039f220f355cd"
2025-10-17 13:54.09: Using OBuilder spec:
((from macos-homebrew-ocaml-5.4)
 (user (uid 1000) (gid 1000))
 (run (shell "ln -f ~/local/bin/opam-dev ~/local/bin/opam"))
 (run (network host)
      (shell "opam init --reinit -ni"))
 (run (shell "opam option solver=builtin-0install && opam config report"))
 (env OPAMDOWNLOADJOBS 1)
 (env OPAMERRLOGLEN 0)
 (env OPAMPRECISETRACKING 1)
 (env CI true)
 (env OPAM_REPO_CI true)
 (run (shell "rm -rf opam-repository/"))
 (copy (src .) (dst opam-repository/))
 (run (shell "opam repository set-url -k local --strict default opam-repository/"))
 (run (network host)
      (shell "opam update --depexts || true"))
 (run (shell "opam pin add -k version -yn ocaml-fsrs.0.1.0-alpha3 0.1.0-alpha3"))
 (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
      (network host)
      (shell  "opam reinstall ocaml-fsrs.0.1.0-alpha3;\
             \n        res=$?;\
             \n        test \"$res\" != 31 && exit \"$res\";\
             \n        export OPAMCLI=2.0;\
             \n        build_dir=$(opam var prefix)/.opam-switch/build;\
             \n        failed=$(ls \"$build_dir\");\
             \n        partial_fails=\"\";\
             \n        for pkg in $failed; do\
             \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"macos-homebrew\\\"\"; then\
             \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
             \n          fi;\
             \n          test \"$pkg\" != 'ocaml-fsrs.0.1.0-alpha3' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
)

2025-10-17 13:54.09: Connecting to build cluster…
2025-10-17 13:54.09: Waiting for resource in pool OCluster
2025-10-17 13:54.30: Waiting for worker…
2025-10-17 14:12.56: Got resource from pool OCluster
Building on m1-worker-04
All commits already cached
Updating files:  68% (12666/18562)
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Updating files: 100% (18562/18562)
Updating files: 100% (18562/18562), done.
HEAD is now at 5bf570252b Merge pull request #28700 from drjdn/opam-publish-p5scm.0.5.0
Merge made by the 'ort' strategy.
 packages/ocaml-fsrs/ocaml-fsrs.0.1.0-alpha3/opam | 41 ++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 packages/ocaml-fsrs/ocaml-fsrs.0.1.0-alpha3/opam

(from macos-homebrew-ocaml-5.4)
2025-10-17 14:12.59 ---> using "338135fbf1889e924a607b47198b8b308c32a925cc9436066d65a9bdc402cad5" from cache

/: (user (uid 1000) (gid 1000))

/: (run (shell "ln -f ~/local/bin/opam-dev ~/local/bin/opam"))
2025-10-17 14:12.59 ---> using "7aa34524ca0a69b4a488c30909f7495a04a243f9066091b1dfe73b446b0dfcd3" from cache

/: (run (network host)
        (shell "opam init --reinit -ni"))
No configuration file found, using built-in defaults.
Checking for available remotes: rsync and local, git.
  - you won't be able to use mercurial repositories unless you install the hg command on your system.
  - you won't be able to use darcs repositories unless you install the darcs command on your system.

This version of opam requires an update to the layout of /Users/mac1000/.opam from version 2.1 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [Y/n] y
[NOTE] The 'jobs' option was reset, its value was 1 and its new value will vary according to the current number of cores on your machine. You can restore the fixed value using:
           opam option jobs=1 --global
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] no changes from git+file:///Users/mac1000/opam-repository
2025-10-17 14:12.59 ---> using "91dcaa513ca3161d91620d0583acdea5310cd52ccab1dfbdd183600da37afdb2" from cache

/: (run (shell "opam option solver=builtin-0install && opam config report"))
Set to 'builtin-0install' the field solver in global configuration
# opam config report
# opam-version         2.4.1
# self-upgrade         no
# system               arch=arm64 os=macos os-distribution=homebrew os-version=15.5
# solver               builtin-0install
# install-criteria     -changed,-count[avoid-version,solution]
# upgrade-criteria     -count[avoid-version,solution]
# jobs                 7
# repositories         1 (version-controlled)
# pinned               0
# current-switch       5.4.0
# invariant            ["ocaml-base-compiler" {= "5.4.0"} | "ocaml-system" {= "5.4.0"}]
# compiler-packages    ocaml-base-compiler.5.4.0, ocaml-compiler.5.4.0, ocaml-options-vanilla.1
# ocaml:native         true
# ocaml:native-tools   true
# ocaml:native-dynlink true
# ocaml:stubsdir       /Users/mac1000/.opam/5.4.0/lib/ocaml/stublibs:/Users/mac1000/.opam/5.4.0/lib/ocaml
# ocaml:preinstalled   false
# ocaml:compiler       5.4.0
2025-10-17 14:12.59 ---> using "cea1bfc0b1cda73d964aa2fc69cc828a6e6d8edd86f991754707e8b004a3cb09" from cache

/: (env OPAMDOWNLOADJOBS 1)

/: (env OPAMERRLOGLEN 0)

/: (env OPAMPRECISETRACKING 1)

/: (env CI true)

/: (env OPAM_REPO_CI true)

/: (run (shell "rm -rf opam-repository/"))
2025-10-17 14:12.59 ---> using "e3eba35b672d86e69268bbb9214f23a1f9d1fb0787b4d803840af8d45829b222" from cache

/: (copy (src .) (dst opam-repository/))
2025-10-17 14:13.01 ---> using "2907d949997fb6e6281eb4ef0f68065a1fb5be62204a16b5a82d36bcb7a409e5" from cache

/: (run (shell "opam repository set-url -k local --strict default opam-repository/"))
[default] Initialised
2025-10-17 14:13.01 ---> using "f39298a64796f814939cae5cb16acc426231c003890e89bfe4e33abfc6fd73cc" from cache

/: (run (network host)
        (shell "opam update --depexts || true"))
+ /opt/homebrew/bin/brew "update"
- ==> Updating Homebrew...
- ==> Homebrew collects anonymous analytics.
- Read the analytics documentation (and how to opt-out) here:
-   https://docs.brew.sh/Analytics
- No analytics have been recorded yet (nor will be during this `brew` run).
- 
- ==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
-   https://github.com/Homebrew/brew#donations
- 
- Already up-to-date.
2025-10-17 14:13.01 ---> using "35012a40c19320c1c6f1c433b10ffa943ba1e144030ea6217f038b2718f09e2f" from cache

/: (run (shell "opam pin add -k version -yn ocaml-fsrs.0.1.0-alpha3 0.1.0-alpha3"))
ocaml-fsrs is now pinned to version 0.1.0-alpha3
2025-10-17 14:13.01 ---> using "ea35a9ac011f63ca75de4c273c5181714e6e2cf1fd93862279801ef768905628" from cache

/: (run (cache (opam-archives (target /Users/mac1000/.opam/download-cache)) (homebrew (target /Users/mac1000/Library/Caches/Homebrew)))
        (network host)
        (shell  "opam reinstall ocaml-fsrs.0.1.0-alpha3;\
               \n        res=$?;\
               \n        test \"$res\" != 31 && exit \"$res\";\
               \n        export OPAMCLI=2.0;\
               \n        build_dir=$(opam var prefix)/.opam-switch/build;\
               \n        failed=$(ls \"$build_dir\");\
               \n        partial_fails=\"\";\
               \n        for pkg in $failed; do\
               \n          if opam show -f x-ci-accept-failures: \"$pkg\" | grep -qF \"\\\"macos-homebrew\\\"\"; then\
               \n            echo \"A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\";\
               \n          fi;\
               \n          test \"$pkg\" != 'ocaml-fsrs.0.1.0-alpha3' && partial_fails=\"$partial_fails $pkg\";\
               \n        done;\
               \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
               \n        exit 1"))
ocaml-fsrs.0.1.0-alpha3 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== install 19 packages
  - install angstrom                0.16.1                [required by timedesc]
  - install base                    v0.17.3               [required by ocaml-fsrs]
  - install bigstringaf             0.10.0                [required by angstrom]
  - install csexp                   1.5.2                 [required by dune-configurator]
  - install dune                    3.20.2                [required by ocaml-fsrs]
  - install dune-configurator       3.20.2                [required by base]
  - install ocaml-fsrs              0.1.0-alpha3 (pinned)
  - install ocaml-syntax-shims      1.0.0                 [required by angstrom]
  - install ocaml_intrinsics_kernel v0.17.1               [required by base]
  - install ocamlbuild              0.16.1                [required by ptime]
  - install ocamlfind               1.9.8                 [required by ptime]
  - install ptime                   1.2.0                 [required by timedesc]
  - install result                  1.5                   [required by timedesc]
  - install seq                     base                  [required by timedesc]
  - install sexplib0                v0.17.0               [required by base]
  - install timedesc                3.1.0                 [required by ocaml-fsrs]
  - install timedesc-tzdb           3.1.0                 [required by timedesc]
  - install timedesc-tzlocal        3.1.0                 [required by timedesc]
  - install topkg                   1.1.0                 [required by ptime]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved angstrom.0.16.1  (cached)
-> retrieved base.v0.17.3  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved dune.3.20.2, dune-configurator.3.20.2  (cached)
[ERROR] Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocaml_intrinsics_kernel.v0.17.1  (cached)
-> retrieved ocamlbuild.0.16.1  (cached)
-> retrieved ocamlfind.1.9.8  (cached)
-> retrieved ptime.1.2.0  (cached)
-> retrieved result.1.5  (cached)
-> retrieved seq.base  (cached)
-> installed seq.base
-> retrieved sexplib0.v0.17.0  (cached)
-> retrieved timedesc.3.1.0, timedesc-tzdb.3.1.0, timedesc-tzlocal.3.1.0  (cached)
-> retrieved topkg.1.1.0  (cached)
-> installed ocamlfind.1.9.8
-> installed ocamlbuild.0.16.1
-> installed topkg.1.1.0
-> installed ptime.1.2.0
-> installed dune.3.20.2
-> installed result.1.5
-> installed csexp.1.5.2
-> installed sexplib0.v0.17.0
-> installed ocaml_intrinsics_kernel.v0.17.1
-> installed ocaml-syntax-shims.1.0.0
-> installed timedesc-tzdb.3.1.0
-> installed timedesc-tzlocal.3.1.0
-> installed dune-configurator.3.20.2
-> installed bigstringaf.0.10.0
-> installed angstrom.0.16.1
-> installed timedesc.3.1.0
-> installed base.v0.17.3

#=== ERROR while fetching sources for ocaml-fsrs.0.1.0-alpha3 =================#
OpamSolution.Fetch_fail("https://github.com/chaosarium/ocaml-fsrs/archive/refs/tags/0.1.0-alpha3.tar.gz (Bad checksum, expected sha256=e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)")


<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - fetch ocaml-fsrs 0.1.0-alpha3
+- 
+- The following changes have been performed
| - install angstrom                0.16.1
| - install base                    v0.17.3
| - install bigstringaf             0.10.0
| - install csexp                   1.5.2
| - install dune                    3.20.2
| - install dune-configurator       3.20.2
| - install ocaml-syntax-shims      1.0.0
| - install ocaml_intrinsics_kernel v0.17.1
| - install ocamlbuild              0.16.1
| - install ocamlfind               1.9.8
| - install ptime                   1.2.0
| - install result                  1.5
| - install seq                     base
| - install sexplib0                v0.17.0
| - install timedesc                3.1.0
| - install timedesc-tzdb           3.1.0
| - install timedesc-tzlocal        3.1.0
| - install topkg                   1.1.0
+- 
# To update the current shell environment, run: eval $(opam env)

The former state can be restored with:
    /opt/homebrew/bin/opam switch import "/Users/mac1000/.opam/5.4.0/.opam-switch/backup/state-20251017141302.export"
"/usr/bin/env" "bash" "-c" "opam reinstall ocaml-fsrs.0.1.0-alpha3;
        res=$?;
        test "$res" != 31 && exit "$res";
        export OPAMCLI=2.0;
        build_dir=$(opam var prefix)/.opam-switch/build;
        failed=$(ls "$build_dir");
        partial_fails="";
        for pkg in $failed; do
          if opam show -f x-ci-accept-failures: "$pkg" | grep -qF "\"macos-homebrew\""; then
            echo "A package failed and has been disabled for CI using the 'x-ci-accept-failures' field.";
          fi;
          test "$pkg" != 'ocaml-fsrs.0.1.0-alpha3' && partial_fails="$partial_fails $pkg";
        done;
        test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}";
        exit 1" failed with exit status 40
2025-10-17 14:13.59: Job failed: Failed: Build failed
2025-10-17 14:13.59: Log analysis:
2025-10-17 14:13.59: >>> 
[ERROR] Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum
 (score = 25)
2025-10-17 14:13.59: Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum