(for PR #29228)

2026-01-16 20:32.22: New job: build proven.0.9.0, using opam dev
                              from https://github.com/ocaml/opam-repository.git#refs/pull/29228/head (a35dbc8a881d9411d03b2b822e4648d893342b2a)
                              on debian-13-ocaml-4.14/arm64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/29228/head" && git reset --hard a35dbc8a
git fetch origin master
git merge --no-edit 92679ed61424ad5e3662cb5bba4effdd8f701363
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-4.14@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1
USER 1000:1000
WORKDIR /home/opam
RUN sudo ln -f /usr/bin/opam-dev /usr/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn proven.0.9.0 0.9.0
RUN opam reinstall proven.0.9.0; \
    res=$?; \
    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 "$pkg" != 'proven.0.9.0' && partial_fails="$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 .

2026-01-16 20:32.22: Using cache hint "ocaml/opam:debian-13-ocaml-4.14@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1-proven.0.9.0-a35dbc8a881d9411d03b2b822e4648d893342b2a"
2026-01-16 20:32.22: Using OBuilder spec:
((from ocaml/opam:debian-13-ocaml-4.14@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1)
 (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 proven.0.9.0 0.9.0"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell  "opam reinstall proven.0.9.0;\
             \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 \"$pkg\" != 'proven.0.9.0' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
)

2026-01-16 20:32.22: Waiting for resource in pool OCluster
2026-01-16 20:32.23: Waiting for worker…
2026-01-16 20:37.00: Got resource from pool OCluster
Building on ainia.caelum.ci.dev
All commits already cached
Updating files:  77% (14976/19220)
Updating files:  78% (14992/19220)
Updating files:  79% (15184/19220)
Updating files:  80% (15376/19220)
Updating files:  81% (15569/19220)
Updating files:  82% (15761/19220)
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Updating files:  87% (16722/19220)
Updating files:  88% (16914/19220)
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Updating files:  99% (19028/19220)
Updating files: 100% (19220/19220)
Updating files: 100% (19220/19220), done.
HEAD is now at 92679ed614 Merge pull request #29220 from davesnx/release-server-reason-react-0.4.1
Updating 92679ed614..a35dbc8a88
Fast-forward
 packages/proven/proven.0.9.0/opam | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 packages/proven/proven.0.9.0/opam

(from ocaml/opam:debian-13-ocaml-4.14@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1)
Unable to find image 'ocaml/opam:debian-13-ocaml-4.14@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1' locally
docker.io/ocaml/opam@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1: Pulling from ocaml/opam
08530324e2a8: Pulling fs layer
08530324e2a8: Download complete
08530324e2a8: Pull complete
Digest: sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1
Status: Downloaded newer image for ocaml/opam@sha256:cbf6017e6b185111bfeb6ea0ee24ddc6296fa2ea756a5b334a13d5bdd29d3fd1
2026-01-16 20:37.02 ---> using "e361c22c5363e81b9c8c24dc824228979d283e71aa561f1da7b3298d2bf27e9f" from cache

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
2026-01-16 20:37.02 ---> using "bd1e238314890df61787720815da795c4465d3f5ceafb6d6394612ffdc3a7587" 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.

Continue? [Y/n] y
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.

Format upgrade done.

<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
2026-01-16 20:37.02 ---> using "f3601c24a10dc523a15105f91de0bc76172749e1f4a8f6fb6ea23b0e953d9b88" 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=arm64 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                 79
# 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
2026-01-16 20:37.02 ---> using "71eb34f3066859d99e9dbabeed250e87aef4209c13a51b78a3ae8c5c4069b73b" 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/"))
2026-01-16 20:37.02 ---> using "a06b65e9004733c962358b0e35456162a45a0953b5b7e59215d14f85ad365696" from cache

/home/opam: (copy (src .) (dst opam-repository/))
2026-01-16 20:37.09 ---> saved as "d1bc86449686d4b698d11574ffcf21d69496949e1a517ebe8e5a26ba55b84932"

/home/opam: (run (shell "opam repository set-url --strict default opam-repository/"))
[default] Initialised
2026-01-16 20:37.30 ---> saved as "107b30281c8ffd124d4c31bcfc523a72863582e641a2d2f76da973d44ad0330b"

/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 arm64 Packages [9607 kB]
- Get:5 http://deb.debian.org/debian-security trixie-security/main arm64 Packages [96.2 kB]
- Fetched 9935 kB in 1s (7904 kB/s)
- Reading package lists...
2026-01-16 20:37.32 ---> saved as "58243c3e5a0d16abe2432223f7a937f16c8791df17d62813a0b4a4af54e2ca07"

/home/opam: (run (shell "opam pin add -k version -yn proven.0.9.0 0.9.0"))
proven is now pinned to version 0.9.0
2026-01-16 20:37.33 ---> saved as "225d8c67e7de100485f36f0e82df203c4b032322e9ca0a7beb78b0ec4128f082"

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell  "opam reinstall proven.0.9.0;\
                        \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 \"$pkg\" != 'proven.0.9.0' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))

<><> Synchronising pinned packages ><><><><><><><><><><><><><><><><><><><><><><>

proven.0.9.0 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== install 2 packages
  - install dune   3.21.0         [required by proven]
  - install proven 0.9.0 (pinned)

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved dune.3.21.0  (cached)
-> retrieved proven.0.9.0  (https://github.com/hyperpolymath/proven/archive/refs/tags/v0.9.0.tar.gz)
-> installed dune.3.21.0
[ERROR] The compilation of proven.0.9.0 failed at "dune subst".

#=== ERROR while compiling proven.0.9.0 =======================================#
# context              2.5.0 | linux/arm64 | ocaml-base-compiler.4.14.2 | pinned(https://github.com/hyperpolymath/proven/archive/refs/tags/v0.9.0.tar.gz)
# path                 ~/.opam/4.14/.opam-switch/build/proven.0.9.0
# command              ~/.opam/opam-init/hooks/sandbox.sh build dune subst
# exit-code            1
# env-file             ~/.opam/log/proven-7-0bfad0.env
# output-file          ~/.opam/log/proven-7-0bfad0.out
### output ###
# File "bindings/ocaml/dune-project", line 1, characters 0-35:
# 1 | ; SPDX-License-Identifier: PMPL-1.0
#     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
# Error: Invalid first line, expected: (lang <lang> <version>)



<><> Error report <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
+- The following actions failed
| - build proven 0.9.0
+- 
+- The following changes have been performed
| - install dune 3.21.0
+- 
# 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-20260116203734.export"
[WARNING] OPAMCONFIRMLEVEL was ignored because CLI 2.0 was requested and it was introduced in 2.1.
[WARNING] OPAMCONFIRMLEVEL was ignored because CLI 2.0 was requested and it was introduced in 2.1.
"/usr/bin/env" "bash" "-c" "opam reinstall proven.0.9.0;
        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 "$pkg" != 'proven.0.9.0' && partial_fails="$partial_fails $pkg";
        done;
        test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}";
        exit 1" failed with exit status 1
2026-01-16 20:38.10: Job failed: Failed: Build failed
2026-01-16 20:38.10: Log analysis:
2026-01-16 20:38.10: >>> 
[ERROR] The compilation of proven.0.9.0 failed at "dune subst".
 (score = 20)
2026-01-16 20:38.10: >>> 
# Error: Invalid first line, expected: (lang <lang> <version>)
 (score = 48)
2026-01-16 20:38.10: Invalid first line, expected: (lang <lang> <version>)