(for PR #27920)

2026-01-12 13:21.32: 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 opensuse-16.0-ocaml-5.4/amd64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/27920/head" && git reset --hard 67423ee8
git fetch origin master
git merge --no-edit 2bf2bf6ea0c8867eede5e26c1c591999dd5a9ee1
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:opensuse-16.0-ocaml-5.4@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a
USER 1000:1000
WORKDIR /home/opam
RUN sudo ln -f /usr/bin/opam-dev /usr/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn ocaml-fsrs.0.1.0-alpha3 0.1.0-alpha3
RUN opam reinstall ocaml-fsrs.0.1.0-alpha3; \
    res=$?; \
    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 "\"opensuse-16.0\""; 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 .

2026-01-12 13:21.32: Using cache hint "ocaml/opam:opensuse-16.0-ocaml-5.4@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a-ocaml-fsrs.0.1.0-alpha3-67423ee84b72a0a7e34b6e84fbb039f220f355cd"
2026-01-12 13:21.32: Using OBuilder spec:
((from ocaml/opam:opensuse-16.0-ocaml-5.4@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a)
 (user (uid 1000) (gid 1000))
 (workdir /home/opam)
 (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
 (run (network host)
      (shell "opam init --reinit --config .opamrc-sandbox -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 --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 /home/opam/.opam/download-cache)))
      (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 \"\\\"opensuse-16.0\\\"\"; 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"))
)

2026-01-12 13:21.32: Connecting to build cluster…
2026-01-12 13:21.32: Waiting for resource in pool OCluster
2026-01-12 13:21.32: Waiting for worker…
2026-01-12 13:24.18: Got resource from pool OCluster
Building on odawa.caelum.ci.dev
All commits already cached
HEAD is now at 2bf2bf6ea0 Merge pull request #29204 from jserot/opam-publish-rfsm.2.3
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 ocaml/opam:opensuse-16.0-ocaml-5.4@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a)
Unable to find image 'ocaml/opam:opensuse-16.0-ocaml-5.4@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a' locally
docker.io/ocaml/opam@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a: Pulling from ocaml/opam
64cfa2a65095: Already exists
1edcfb1efe19: Already exists
3ddbff1fae48: Already exists
6f97b42e121d: Already exists
35edc2941e66: Already exists
664494e6aa3b: Already exists
6e72e374834b: Already exists
9897d53e41d9: Already exists
5955f0d634c5: Already exists
39569ccf3df4: Already exists
3835c4318084: Already exists
549825d0ab03: Already exists
6e7368d99114: Already exists
cb6191f3eef1: Already exists
188d98a9d457: Already exists
d034bf0e16e1: Already exists
8cb90b8f1fc2: Already exists
5fad6a4c52b5: Already exists
debd84a910b3: Already exists
4f4fb700ef54: Already exists
152a68323944: Already exists
1f7f98a5f0d2: Already exists
667866023596: Already exists
474d64aaa83a: Already exists
81e9448f8d7d: Already exists
8f7471ae6f30: Already exists
ba1c9d522099: Already exists
847d9b38068d: Already exists
6c1cb3b3dd7c: Already exists
30a81ee5e9b7: Already exists
b395d300d073: Already exists
689e54a1bb6f: Already exists
cfba20ff1fbb: Already exists
d6503c133859: Already exists
3dcf084af38f: Already exists
22043404df4c: Already exists
780f53a6c5cb: Already exists
38b848127537: Already exists
7d097aa57719: Pulling fs layer
6d4fee4093bd: Pulling fs layer
923f8d6aefab: Pulling fs layer
ffa955d5e936: Pulling fs layer
39bed0558f8a: Pulling fs layer
7bc20d60116c: Pulling fs layer
9abb721d7658: Pulling fs layer
ffa955d5e936: Waiting
39bed0558f8a: Waiting
9abb721d7658: Waiting
7bc20d60116c: Waiting
7d097aa57719: Verifying Checksum
7d097aa57719: Download complete
7d097aa57719: Pull complete
6d4fee4093bd: Verifying Checksum
6d4fee4093bd: Download complete
6d4fee4093bd: Pull complete
923f8d6aefab: Download complete
923f8d6aefab: Pull complete
39bed0558f8a: Verifying Checksum
39bed0558f8a: Download complete
9abb721d7658: Verifying Checksum
9abb721d7658: Download complete
7bc20d60116c: Verifying Checksum
7bc20d60116c: Download complete
ffa955d5e936: Verifying Checksum
ffa955d5e936: Download complete
ffa955d5e936: Pull complete
39bed0558f8a: Pull complete
7bc20d60116c: Pull complete
9abb721d7658: Pull complete
Digest: sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a
Status: Downloaded newer image for ocaml/opam@sha256:b4c4078273e87bccedd39788dec2f1547d525cdade7f23d755aa37113ddc398a
2026-01-12 13:24.47 ---> using "b406375448d05c740c3dfe01a84fe3cd4b6f40cee7cc2d77fc552f60deaa28cc" from cache

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
2026-01-12 13:24.47 ---> using "9d16cd35284e14fb6e0df42923cf19d87aa63616d68c318f491ab32eb166fa51" from cache

/home/opam: (run (network host)
                 (shell "opam init --reinit --config .opamrc-sandbox -ni"))
Configuring from /home/opam/.opamrc-sandbox, then /home/opam/.opamrc, and finally from 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 /home/opam/.opam from version 2.0 to version 2.2, which can't be reverted.
You may want to back it up before going further.

Continue? [Y/n] y
Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
2026-01-12 13:24.47 ---> using "c971d2f72b7bd8ed3a79194099d3c2a0f988c873c259b6b73f382a9b23201bd2" from cache

/home/opam: (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         2.5.0
# self-upgrade         no
# system               arch=x86_64 os=linux os-distribution=opensuse-leap os-version=16.0
# solver               builtin-0install
# install-criteria     -changed,-count[avoid-version,solution]
# upgrade-criteria     -count[avoid-version,solution]
# jobs                 255
# repositories         1 (version-controlled)
# pinned               1 (version)
# current-switch       5.4
# invariant            ["ocaml-base-compiler" {>= "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       /home/opam/.opam/5.4/lib/ocaml/stublibs:/home/opam/.opam/5.4/lib/ocaml
# ocaml:preinstalled   false
# ocaml:compiler       5.4.0
2026-01-12 13:24.47 ---> using "760bf56f18425d9a34fcf28594c35601937376e700ed03dfd872869a09e8170e" from cache

/home/opam: (env OPAMDOWNLOADJOBS 1)

/home/opam: (env OPAMERRLOGLEN 0)

/home/opam: (env OPAMPRECISETRACKING 1)

/home/opam: (env CI true)

/home/opam: (env OPAM_REPO_CI true)

/home/opam: (run (shell "rm -rf opam-repository/"))
2026-01-12 13:24.47 ---> using "33a9e37cad08fa7273f962bc92088ff3b7b341181e16cba882792926f5b5b954" from cache

/home/opam: (copy (src .) (dst opam-repository/))
2026-01-12 13:24.50 ---> saved as "b251c042ab9941ae6b17e202a10295b283aa70df82126fa9a9985f8867a1ff90"

/home/opam: (run (shell "opam repository set-url --strict default opam-repository/"))
[default] Initialised
2026-01-12 13:25.08 ---> saved as "6f3686950c153719af87afa6cae57f89149fa2981003d5bce0fe07ea374d8963"

/home/opam: (run (network host)
                 (shell "opam update --depexts || true"))
+ /usr/bin/sudo "zypper" "--non-interactive" "refresh"
- Repository 'repo-openh264 (16.0)' is up to date.
- Repository 'repo-oss (16.0)' is up to date.
- All repositories have been refreshed.
2026-01-12 13:25.09 ---> saved as "49889a22a4c1f4f0f0eed6bf256cd9178775521b20ed9953b32212d14f055eb0"

/home/opam: (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
2026-01-12 13:25.11 ---> saved as "742aff0f6ea3ed84881756deba7984b0c22d52d9d114f5bda29fc6b8cc02e2fb"

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (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 \"\\\"opensuse-16.0\\\"\"; 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                   1.1.1                 [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.1.1.1  (cached)
-> installed ocamlfind.1.9.8
-> installed ocamlbuild.0.16.1
-> installed topkg.1.1.1
-> installed ptime.1.2.0
-> installed dune.3.20.2
-> installed csexp.1.5.2
-> installed ocaml-syntax-shims.1.0.0
-> installed ocaml_intrinsics_kernel.v0.17.1
-> installed result.1.5
-> installed sexplib0.v0.17.0
-> 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                   1.1.1
+- 
# To update the current shell environment, run: eval $(opam env)

The former state can be restored with:
    /usr/bin/opam switch import "/home/opam/.opam/5.4/.opam-switch/backup/state-20260112132511.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 "\"opensuse-16.0\""; 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
2026-01-12 13:25.50: Job failed: Failed: Build failed
2026-01-12 13:25.50: Log analysis:
2026-01-12 13:25.50: >>> 
[ERROR] Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum
 (score = 25)
2026-01-12 13:25.50: Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum