(for PR #27920)

2026-01-12 13:21.23: New job: build ocaml-fsrs.0.1.0-alpha3, using opam 2.5
                              from https://github.com/ocaml/opam-repository.git#refs/pull/27920/head (67423ee84b72a0a7e34b6e84fbb039f220f355cd)
                              on debian-13-ocaml-4.14/amd64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/27920/head" && git reset --hard 67423ee8
git fetch origin master
git merge --no-edit 2bf2bf6ea0c8867eede5e26c1c591999dd5a9ee1
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa
USER 1000:1000
WORKDIR /home/opam
RUN sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn ocaml-fsrs.0.1.0-alpha3 0.1.0-alpha3
RUN opam reinstall ocaml-fsrs.0.1.0-alpha3; \
    res=$?; \
    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 "\"debian-13\""; 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 13:21.23: Using cache hint "ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa-ocaml-fsrs.0.1.0-alpha3-67423ee84b72a0a7e34b6e84fbb039f220f355cd"
2026-01-12 13:21.23: Using OBuilder spec:
((from ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa)
 (user (uid 1000) (gid 1000))
 (workdir /home/opam)
 (run (shell "sudo ln -f /usr/bin/opam-2.5 /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 \"\\\"debian-13\\\"\"; 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 13:21.23: Connecting to build cluster…
2026-01-12 13:21.23: Waiting for resource in pool OCluster
2026-01-12 13:29.09: Waiting for worker…
2026-01-12 13:32.51: Got resource from pool OCluster
Building on toxis.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:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa)
Unable to find image 'ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa' locally
docker.io/ocaml/opam@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa: Pulling from ocaml/opam
281b80c799de: Already exists
ce76feb86791: Already exists
7984eb0e5b45: Already exists
56c452a960b1: Already exists
b85825bef00a: Already exists
d6ff43dfb85c: Already exists
4197ec645389: Already exists
37cac33e41ff: Already exists
4cb993fb248e: Already exists
ca442870f91f: Already exists
b1d1a2fb5f4a: Already exists
0dea577b2801: Already exists
cc10daaea4fd: Already exists
5f878cb1723a: Already exists
8968959fa983: Already exists
5bdd9b9ed0e3: Already exists
55661c5b388f: Already exists
55661c5b388f: Already exists
92d1dc6907bd: Already exists
7100b414728b: Already exists
a6a54ddc9818: Already exists
a920ad627810: Already exists
4f4fb700ef54: Already exists
f7df7b6e19c0: Already exists
cd713d66718c: Already exists
6ed45ab2af86: Already exists
40598b80a8fe: Already exists
983f7969ff00: Already exists
40ec09ee09bd: Already exists
76a0afa38cd9: Already exists
1d5a564d139a: Already exists
82883b85a4f0: Already exists
1d8458efd73b: Already exists
2d80a9fac9ac: Already exists
4d69ee6ae94b: Already exists
ce8d28b713f1: Already exists
97580d938033: Already exists
da5fa40e04f8: Already exists
d7a499968f64: Already exists
28e5932c7c69: Already exists
81389c423fc3: Already exists
fd0f9d83fc4c: Pulling fs layer
a1ba3ff55715: Pulling fs layer
8a64be1e983f: Pulling fs layer
f7b330997686: Pulling fs layer
f7b330997686: Waiting
a1ba3ff55715: Verifying Checksum
a1ba3ff55715: Download complete
8a64be1e983f: Verifying Checksum
f7b330997686: Verifying Checksum
f7b330997686: Download complete
fd0f9d83fc4c: Verifying Checksum
fd0f9d83fc4c: Download complete
fd0f9d83fc4c: Pull complete
a1ba3ff55715: Pull complete
8a64be1e983f: Pull complete
f7b330997686: Pull complete
Digest: sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa
Status: Downloaded newer image for ocaml/opam@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa
2026-01-12 13:33.03 ---> using "2ecda48447fc68e8dcd256d2898af0a11126a077e05d747a0dcdff2845100de1" from cache

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-2.5 /usr/bin/opam"))
2026-01-12 13:33.03 ---> using "5adc3058b8874e3588dd3ff090fb85a91c02d1b033857668fae9d659bef113b2" 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 13:33.03 ---> using "e866277335fb51d9579be86bc22171cc02a5a44af0860982fcb593f2a67cd411" 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=debian os-version=13
# solver               builtin-0install
# install-criteria     -changed,-count[avoid-version,solution]
# upgrade-criteria     -count[avoid-version,solution]
# jobs                 71
# repositories         1 (version-controlled)
# pinned               1 (version)
# current-switch       4.14
# invariant            ["ocaml-base-compiler" {= "4.14.2"}]
# compiler-packages    ocaml-base-compiler.4.14.2, ocaml-options-vanilla.1
# ocaml:native         true
# ocaml:native-tools   true
# ocaml:native-dynlink true
# ocaml:stubsdir       /home/opam/.opam/4.14/lib/ocaml/stublibs:/home/opam/.opam/4.14/lib/ocaml
# ocaml:preinstalled   false
# ocaml:compiler       4.14.2
2026-01-12 13:33.03 ---> using "e64e79b0be0dfa74d161b16c150520ace08604fac8f555a71cb784f968a3e05c" 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 13:33.03 ---> using "1d85d55616c7b8edee43aaeeb92897636f5a317523ced495c5e6b12b063dc1ec" from cache

/home/opam: (copy (src .) (dst opam-repository/))
2026-01-12 13:33.18 ---> saved as "b76b43ccc4e479a384fdf94bf24baa447b06efb29083857225d1cc5d94faee28"

/home/opam: (run (shell "opam repository set-url --strict default opam-repository/"))
[default] Initialised
2026-01-12 13:33.39 ---> saved as "d20efee007792f09d0e769f752617db2b18eb5ac6a294c8b874acfa5798946a7"

/home/opam: (run (network host)
                 (shell "opam update --depexts || true"))
+ /usr/bin/sudo "apt-get" "update"
- Get:1 http://deb.debian.org/debian trixie InRelease [140 kB]
- Get:2 http://deb.debian.org/debian trixie-updates InRelease [47.3 kB]
- Get:3 http://deb.debian.org/debian-security trixie-security InRelease [43.4 kB]
- Get:4 http://deb.debian.org/debian trixie/main amd64 Packages [9670 kB]
- Get:5 http://deb.debian.org/debian-security trixie-security/main amd64 Packages [94.5 kB]
- Fetched 9996 kB in 22s (461 kB/s)
- Reading package lists...
- 
2026-01-12 13:34.01 ---> saved as "feae3a430f6a049400c19f27000c69ec586a52d4250db246d7b79d1b1ed59228"

/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 13:34.02 ---> saved as "b198d526374a91b8c53333c89c0fe48673b0e23f94f9c6c0c1d097f30434dca3"

/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 \"\\\"debian-13\\\"\"; 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 18 packages
  - install angstrom           0.16.1                [required by timedesc]
  - install base               v0.16.4               [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 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           v0.16.0               [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.v0.16.4  (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 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.v0.16.0  (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 result.1.5
-> installed csexp.1.5.2
-> installed ocaml-syntax-shims.1.0.0
-> installed sexplib0.v0.16.0
-> 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.v0.16.4

#=== 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               v0.16.4
| - 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 ocamlbuild         0.16.1
| - install ocamlfind          1.9.8
| - install ptime              1.2.0
| - install result             1.5
| - install seq                base
| - install sexplib0           v0.16.0
| - 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/4.14/.opam-switch/backup/state-20260112133403.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 "\"debian-13\""; 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 13:35.04: Job failed: Failed: Build failed
2026-01-12 13:35.04: Log analysis:
2026-01-12 13:35.04: >>> 
[ERROR] Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum
 (score = 25)
2026-01-12 13:35.04: Failed to get sources of ocaml-fsrs.0.1.0-alpha3: Bad checksum