Build:
  1. 0
2026-01-13 04:05.03: New job: test colombe.0.6.0 with dune.3.21.0, using opam dev
                              from https://github.com/ocaml/opam-repository.git#refs/pull/29216/head (001b427da21d4d746e124eaaffab7b4134813f6d)
                              on debian-13-ocaml-4.14/amd64

To reproduce locally:

cd $(mktemp -d)
git clone --recursive "https://github.com/ocaml/opam-repository.git" && cd "opam-repository" && git fetch origin "refs/pull/29216/head" && git reset --hard 001b427d
git fetch origin master
git merge --no-edit 1c361fac36225534ee877701522e296785f9a9db
cat > ../Dockerfile <<'END-OF-DOCKERFILE'
FROM ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa
USER 1000:1000
WORKDIR /home/opam
RUN sudo ln -f /usr/bin/opam-dev /usr/bin/opam
RUN opam init --reinit -ni
RUN opam option solver=builtin-0install && opam config report
ENV OPAMDOWNLOADJOBS="1"
ENV OPAMERRLOGLEN="0"
ENV OPAMPRECISETRACKING="1"
ENV CI="true"
ENV OPAM_REPO_CI="true"
RUN rm -rf opam-repository/
COPY --chown=1000:1000 . opam-repository/
RUN opam repository set-url --strict default opam-repository/
RUN opam update --depexts || true
RUN opam pin add -k version -yn dune.3.21.0 3.21.0
RUN opam reinstall dune.3.21.0; \
    res=$?; \
    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 "$pkg" != 'dune.3.21.0' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1
RUN opam reinstall colombe.0.6.0; \
    res=$?; \
    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 "$pkg" != 'colombe.0.6.0' && partial_fails="$partial_fails $pkg"; \
    done; \
    test "${partial_fails}" != "" && echo "opam-repo-ci detected dependencies failing: ${partial_fails}"; \
    exit 1
RUN (opam reinstall --with-test colombe.0.6.0) || true
RUN opam reinstall --with-test --verbose colombe.0.6.0; \
    res=$?; \
    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 "$pkg" != 'colombe.0.6.0' && partial_fails="$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 .

2026-01-13 04:05.03: Using cache hint "ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa-dune.3.21.0-colombe.0.6.0-001b427da21d4d746e124eaaffab7b4134813f6d"
2026-01-13 04:05.03: 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-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 dune.3.21.0 3.21.0"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell  "opam reinstall dune.3.21.0;\
             \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 \"$pkg\" != 'dune.3.21.0' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
 (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
      (network host)
      (shell  "opam reinstall colombe.0.6.0;\
             \n        res=$?;\
             \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 \"$pkg\" != 'colombe.0.6.0' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
 (run (network host)
      (shell "(opam reinstall --with-test colombe.0.6.0) || true"))
 (run (shell  "opam reinstall --with-test --verbose colombe.0.6.0;\
             \n        res=$?;\
             \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 \"$pkg\" != 'colombe.0.6.0' && partial_fails=\"$partial_fails $pkg\";\
             \n        done;\
             \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
             \n        exit 1"))
)

2026-01-13 04:05.03: Waiting for resource in pool OCluster
2026-01-13 19:14.40: Waiting for worker…
2026-01-13 19:20.09: Got resource from pool OCluster
Building on eumache
All commits already cached
Updating files:  77% (14879/19211)
Updating files:  78% (14985/19211)
Updating files:  79% (15177/19211)
Updating files:  80% (15369/19211)
Updating files:  81% (15561/19211)
Updating files:  82% (15754/19211)
Updating files:  83% (15946/19211)
Updating files:  84% (16138/19211)
Updating files:  85% (16330/19211)
Updating files:  86% (16522/19211)
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Updating files:  88% (16906/19211)
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Updating files:  90% (17290/19211)
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Updating files:  93% (17867/19211)
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Updating files:  96% (18443/19211)
Updating files:  97% (18635/19211)
Updating files:  98% (18827/19211)
Updating files:  99% (19019/19211)
Updating files: 100% (19211/19211)
Updating files: 100% (19211/19211), done.
HEAD is now at 1c361fac36 Merge pull request #29210 from dinosaure/release-miou-v0.5.1
Merge made by the 'ort' strategy.
 packages/chrome-trace/chrome-trace.3.21.0/opam     | 41 ++++++++++++
 .../dune-action-plugin.3.21.0/opam                 | 54 ++++++++++++++++
 .../dune-build-info/dune-build-info.3.21.0/opam    | 47 ++++++++++++++
 .../dune-configurator.3.21.0/opam                  | 51 +++++++++++++++
 packages/dune-glob/dune-glob.3.21.0/opam           | 44 +++++++++++++
 .../dune-private-libs.3.21.0/opam                  | 52 +++++++++++++++
 packages/dune-rpc-lwt/dune-rpc-lwt.3.21.0/opam     | 43 +++++++++++++
 packages/dune-rpc/dune-rpc.3.21.0/opam             | 46 +++++++++++++
 packages/dune-site/dune-site.3.21.0/opam           | 39 +++++++++++
 packages/dune/dune.3.21.0/opam                     | 75 ++++++++++++++++++++++
 packages/dyn/dyn.3.21.0/opam                       | 42 ++++++++++++
 packages/fs-io/fs-io.3.21.0/opam                   | 41 ++++++++++++
 packages/ocamlc-loc/ocamlc-loc.3.21.0/opam         | 45 +++++++++++++
 packages/ordering/ordering.3.21.0/opam             | 40 ++++++++++++
 packages/stdune/stdune.3.21.0/opam                 | 48 ++++++++++++++
 packages/top-closure/top-closure.3.21.0/opam       | 40 ++++++++++++
 packages/xdg/xdg.3.21.0/opam                       | 41 ++++++++++++
 17 files changed, 789 insertions(+)
 create mode 100644 packages/chrome-trace/chrome-trace.3.21.0/opam
 create mode 100644 packages/dune-action-plugin/dune-action-plugin.3.21.0/opam
 create mode 100644 packages/dune-build-info/dune-build-info.3.21.0/opam
 create mode 100644 packages/dune-configurator/dune-configurator.3.21.0/opam
 create mode 100644 packages/dune-glob/dune-glob.3.21.0/opam
 create mode 100644 packages/dune-private-libs/dune-private-libs.3.21.0/opam
 create mode 100644 packages/dune-rpc-lwt/dune-rpc-lwt.3.21.0/opam
 create mode 100644 packages/dune-rpc/dune-rpc.3.21.0/opam
 create mode 100644 packages/dune-site/dune-site.3.21.0/opam
 create mode 100644 packages/dune/dune.3.21.0/opam
 create mode 100644 packages/dyn/dyn.3.21.0/opam
 create mode 100644 packages/fs-io/fs-io.3.21.0/opam
 create mode 100644 packages/ocamlc-loc/ocamlc-loc.3.21.0/opam
 create mode 100644 packages/ordering/ordering.3.21.0/opam
 create mode 100644 packages/stdune/stdune.3.21.0/opam
 create mode 100644 packages/top-closure/top-closure.3.21.0/opam
 create mode 100644 packages/xdg/xdg.3.21.0/opam

(from ocaml/opam:debian-13-ocaml-4.14@sha256:d765b54c014ef238f3a84185055fd22f6a5e5bea6d6bbe9ec94a1c7ac9087afa)
2026-01-13 19:20.22 ---> using "2ecda48447fc68e8dcd256d2898af0a11126a077e05d747a0dcdff2845100de1" from cache

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
2026-01-13 19:20.22 ---> using "79eb1218297339daa5e94be48ad16ae73f417b872defa106efeff5b5f3323e6e" 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
Format upgrade done.
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.


<><> Updating repositories ><><><><><><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised
2026-01-13 19:20.22 ---> using "bf81485066c79fc9faf7a51b95869ba9d998fe2bf3de5ff7f59b253fc915122f" 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
2026-01-13 19:20.22 ---> using "f7c0c02658daf7a6d6c7671a8028e0e553264100bd569724894645b7844f6d7f" 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/"))
2026-01-13 19:20.22 ---> using "9b3e592c65565b9b3dc8b88c605e54ddba818eb105df981d794040a64c2f9916" from cache

/home/opam: (copy (src .) (dst opam-repository/))
2026-01-13 19:20.23 ---> using "09c39d7126e88ed573ca8f78acbffb48c0088baecebf7a9155a91c3290ace20b" from cache

/home/opam: (run (shell "opam repository set-url --strict default opam-repository/"))
[default] Initialised
2026-01-13 19:20.23 ---> using "1f9ebb837e22c3f42b1c3f6e7178a2aa2fcb8206685e62bba70fde550083c584" from cache

/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 [95.5 kB]
- Fetched 9997 kB in 1s (7296 kB/s)
- Reading package lists...
- 
2026-01-13 19:20.23 ---> using "bc5a313c83583d746179a868806b410c236b5a3d4895b7d8bc464eed6cfe706e" from cache

/home/opam: (run (shell "opam pin add -k version -yn dune.3.21.0 3.21.0"))
dune is now pinned to version 3.21.0
2026-01-13 19:20.23 ---> using "448b2b0e77526967dc1d84c9cd1fd4fdf010f08d862d127b94c63a52bbc324d1" from cache

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell  "opam reinstall dune.3.21.0;\
                        \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 \"$pkg\" != 'dune.3.21.0' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))
dune.3.21.0 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== install 1 package
  - install dune 3.21.0 (pinned)

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved dune.3.21.0  (cached)
-> installed dune.3.21.0
Done.
# To update the current shell environment, run: eval $(opam env)
2026-01-13 19:20.23 ---> using "5acb627376dc8b6ecaceedd8635589b9dfb44ea06abcf3fc03092c3e94ea4126" from cache

/home/opam: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell  "opam reinstall colombe.0.6.0;\
                        \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 \"$pkg\" != 'colombe.0.6.0' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))
colombe.0.6.0 is not installed. Install it? [Y/n] y
The following actions will be performed:
=== install 13 packages
  - install angstrom           0.16.1 [required by colombe]
  - install bigstringaf        0.10.0 [required by angstrom]
  - install colombe            0.6.0
  - install csexp              1.5.2  [required by dune-configurator]
  - install domain-name        0.5.0  [required by ipaddr]
  - install dune-configurator  3.21.0 [required by bigstringaf]
  - install fmt                0.11.0 [required by colombe]
  - install ipaddr             5.6.1  [required by colombe]
  - install macaddr            5.6.1  [required by ipaddr]
  - install ocaml-syntax-shims 1.0.0  [required by colombe]
  - install ocamlbuild         0.16.1 [required by fmt]
  - install ocamlfind          1.9.8  [required by fmt]
  - install topkg              1.1.1  [required by fmt]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved angstrom.0.16.1  (cached)
-> retrieved bigstringaf.0.10.0  (cached)
-> retrieved colombe.0.6.0  (cached)
-> retrieved csexp.1.5.2  (cached)
-> retrieved domain-name.0.5.0  (cached)
-> installed csexp.1.5.2
-> installed domain-name.0.5.0
-> retrieved dune-configurator.3.21.0  (cached)
-> retrieved fmt.0.11.0  (cached)
-> retrieved ipaddr.5.6.1, macaddr.5.6.1  (cached)
-> retrieved ocaml-syntax-shims.1.0.0  (cached)
-> retrieved ocamlbuild.0.16.1  (cached)
-> retrieved ocamlfind.1.9.8  (cached)
-> retrieved topkg.1.1.1  (cached)
-> installed macaddr.5.6.1
-> installed ipaddr.5.6.1
-> installed ocaml-syntax-shims.1.0.0
-> installed dune-configurator.3.21.0
-> installed bigstringaf.0.10.0
-> installed angstrom.0.16.1
-> installed ocamlfind.1.9.8
-> installed ocamlbuild.0.16.1
-> installed topkg.1.1.1
-> installed fmt.0.11.0
-> installed colombe.0.6.0
Done.
# To update the current shell environment, run: eval $(opam env)
2026-01-13 19:20.57 ---> saved as "032b69dccca117993c0d6383d515a7abf17b2a3ca951003994cac745c9e56174"

/home/opam: (run (network host)
                 (shell "(opam reinstall --with-test colombe.0.6.0) || true"))
The following actions will be performed:
=== recompile 2 packages
  - recompile colombe        0.6.0
  - recompile fmt            0.11.0 [uses cmdliner]
=== install 8 packages
  - install   afl-persistent 1.4    [required by crowbar]
  - install   alcotest       1.9.1  [required by colombe]
  - install   astring        0.8.5  [required by alcotest]
  - install   cmdliner       2.1.0  [required by alcotest, crowbar]
  - install   crowbar        0.2.2  [required by colombe]
  - install   re             1.14.0 [required by alcotest]
  - install   stdlib-shims   0.3.0  [required by alcotest]
  - install   uutf           1.0.4  [required by alcotest]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved afl-persistent.1.4  (https://opam.ocaml.org/cache)
-> retrieved alcotest.1.9.1  (https://opam.ocaml.org/cache)
-> installed afl-persistent.1.4
-> retrieved astring.0.8.5  (https://opam.ocaml.org/cache)
-> retrieved cmdliner.2.1.0  (https://opam.ocaml.org/cache)
-> retrieved colombe.0.6.0  (https://opam.ocaml.org/cache)
-> retrieved crowbar.0.2.2  (https://opam.ocaml.org/cache)
-> retrieved fmt.0.11.0  (https://opam.ocaml.org/cache)
-> retrieved re.1.14.0  (https://opam.ocaml.org/cache)
-> retrieved stdlib-shims.0.3.0  (https://opam.ocaml.org/cache)
-> retrieved uutf.1.0.4  (https://opam.ocaml.org/cache)
-> installed stdlib-shims.0.3.0
-> installed astring.0.8.5
-> installed re.1.14.0
-> removed   colombe.0.6.0
-> removed   fmt.0.11.0
-> installed cmdliner.2.1.0
-> installed crowbar.0.2.2
-> installed uutf.1.0.4
-> installed fmt.0.11.0
-> installed alcotest.1.9.1
-> installed colombe.0.6.0
Done.

<><> afl-persistent.1.4 installed successfully ><><><><><><><><><><><><><><><><>
=> afl-persistent is installed, but since the current OCaml compiler does
   not enable AFL instrumentation by default, most packages will not be
   instrumented and fuzzing with afl-fuzz may not be effective.

   To globally enable AFL instrumentation, create an OCaml switch like:

     opam switch create 4.14.2+afl ocaml-variants.4.14.2+options ocaml-option-afl
# To update the current shell environment, run: eval $(opam env)
2026-01-13 19:21.29 ---> saved as "1bb5c2284b9f138f2e11e58c910a61a7af193b2559732e0920c0426c6bccf314"

/home/opam: (run (shell  "opam reinstall --with-test --verbose colombe.0.6.0;\
                        \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 \"$pkg\" != 'colombe.0.6.0' && partial_fails=\"$partial_fails $pkg\";\
                        \n        done;\
                        \n        test \"${partial_fails}\" != \"\" && echo \"opam-repo-ci detected dependencies failing: ${partial_fails}\";\
                        \n        exit 1"))
The following actions will be performed:
=== recompile 1 package
  - recompile colombe 0.6.0

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Processing  1/4: [colombe.0.6.0: extract]
-> retrieved colombe.0.6.0  (cached)
Processing  2/4: [colombe: dune build]
+ /home/opam/.opam/opam-init/hooks/sandbox.sh "build" "dune" "build" "-p" "colombe" "-j" "71" (CWD=/home/opam/.opam/4.14/.opam-switch/build/colombe.0.6.0)
Processing  2/4: [colombe: dune runtest]
+ /home/opam/.opam/opam-init/hooks/sandbox.sh "build" "dune" "runtest" "-p" "colombe" "-j" "71" (CWD=/home/opam/.opam/4.14/.opam-switch/build/colombe.0.6.0)
- (cd _build/default/test && ./test.exe --color=always)
- Testing `colombe'.
- This run has ID `EJGX8B1U'.
- 
-   [OK]          requests 0             0   EHLO bar.com.
-   [OK]          requests 0             1   MAIL FROM:<Smith@bar.com>.
-   [OK]          requests 0             2   RCPT TO:<Jones@foo.com>.
-   [OK]          requests 0             3   RCPT TO:<Green@foo.com>.
-   [OK]          requests 0             4   RCPT TO:<Brown@foo.com>.
-   [OK]          requests 0             5   DATA.
-   [OK]          requests 0             6   QUIT.
-   [OK]          requests 0             7   EHLO bar.com.
-   [OK]          requests 0             8   MAIL FROM:<Smith@bar.com>.
-   [OK]          requests 0             9   RCPT TO:<Jones@foo.com>.
-   [OK]          requests 0            10   RCPT TO:<Green@foo.com>.
-   [OK]          requests 0            11   RSET.
-   [OK]          requests 0            12   QUIT.
-   [OK]          requests 0            13   EHLO bar.com.
-   [OK]          requests 0            14   MAIL FROM:<JQP@bar.com>.
-   [OK]          requests 0            15   RCPT TO:<Jones@XYZ.COM>.
-   [OK]          requests 0            16   DATA.
-   [OK]          requests 0            17   QUIT.
-   [OK]          requests 0            18   EHLO foo.com.
-   [OK]          requests 0            19   MAIL FROM:<JQP@bar.com>.
-   [OK]          requests 0            20   RCPT TO:<Jones@XYZ.COM>.
-   [OK]          requests 0            21   DATA.
-   [OK]          requests 0            22   QUIT.
-   [OK]          requests 0            23   EHLO bar.com.
-   [OK]          requests 0            24   VRFY Crispin.
-   [OK]          requests 0            25   MAIL FROM:<EAK@bar.com>.
-   [OK]          requests 0            26   RCPT TO:<Admin.MRC@foo.com>.
-   [OK]          requests 0            27   DATA.
-   [OK]          requests 0            28   QUIT.
-   [OK]          requests 0            29   NOOP.
-   [OK]          requests 1             0   (Hello bar.com).
-   [OK]          requests 1             1   (Mail { path= <"Smith"@bar.com>; p...
-   [OK]          requests 1             2   (Recipient { path= forward-path:<"...
-   [OK]          requests 1             3   (Recipient { path= forward-path:<"...
-   [OK]          requests 1             4   (Recipient { path= forward-path:<"...
-   [OK]          requests 1             5   Data.
-   [OK]          requests 1             6   Quit.
-   [OK]          requests 1             7   (Hello bar.com).
-   [OK]          requests 1             8   (Mail { path= <"Smith"@bar.com>; p...
-   [OK]          requests 1             9   (Recipient { path= forward-path:<"...
-   [OK]          requests 1            10   (Recipient { path= forward-path:<"...
-   [OK]          requests 1            11   Reset.
-   [OK]          requests 1            12   Quit.
-   [OK]          requests 1            13   (Hello bar.com).
-   [OK]          requests 1            14   (Mail { path= <"JQP"@bar.com>; par...
-   [OK]          requests 1            15   (Recipient { path= forward-path:<"...
-   [OK]          requests 1            16   Data.
-   [OK]          requests 1            17   Quit.
-   [OK]          requests 1            18   (Hello foo.com).
-   [OK]          requests 1            19   (Mail { path= <"JQP"@bar.com>; par...
-   [OK]          requests 1            20   (Recipient { path= forward-path:<"...
-   [OK]          requests 1            21   Data.
-   [OK]          requests 1            22   Quit.
-   [OK]          requests 1            23   (Hello bar.com).
-   [OK]          requests 1            24   (Verify Crispin).
-   [OK]          requests 1            25   (Mail { path= <"EAK"@bar.com>; par...
-   [OK]          requests 1            26   (Recipient { path= forward-path:<A...
-   [OK]          requests 1            27   Data.
-   [OK]          requests 1            28   Quit.
-   [OK]          requests 1            29   (Noop ).
-   [OK]          replies 0              0   220 foo.com Simple Mail Transfer S...
-   [OK]          replies 0              1   250-foo.com greets bar.com...
-   [OK]          replies 0              2   250 Mark Crispin <Admin.MRC@foo.com>.
-   [OK]          replies 0              3   250 OK.
-   [OK]          replies 0              4   250 OK.
-   [OK]          replies 0              5   354 Start mail input; end with <CR...
-   [OK]          replies 0              6   250 OK.
-   [OK]          replies 0              7   221 foo.com Service closing transm...
-   [OK]          replies 0              8   220 xyz.com Simple Mail Transfer S...
-   [OK]          replies 0              9   250 xyz.com is on the air.
-   [OK]          replies 0             10   250 OK.
-   [OK]          replies 0             11   250 OK.
-   [OK]          replies 0             12   354 Start mail input; end with <CR...
-   [OK]          replies 0             13   250 OK.
-   [OK]          replies 0             14   221 foo.com Service closing transm...
-   [OK]          replies 0             15   220 foo.com Simple Mail Transfer S...
-   [OK]          replies 0             16   250-foo.com greets bar.com...
-   [OK]          replies 0             17   250 OK.
-   [OK]          replies 0             18   250 OK.
-   [OK]          replies 0             19   354 Start mail input; end with <CR...
-   [OK]          replies 0             20   250 OK.
-   [OK]          replies 0             21   221 foo.com Service closing transm...
-   [OK]          replies 0             22   220 foo.com Simple Mail Transfer S...
-   [OK]          replies 0             23   250-foo.com greets bar.com...
-   [OK]          replies 0             24   250 OK.
-   [OK]          replies 0             25   250 OK.
-   [OK]          replies 0             26   550 No such user here.
-   [OK]          replies 0             27   250 OK.
-   [OK]          replies 0             28   221 foo.com Service closing transm...
-   [OK]          replies 0             29   220 foo.com Simple Mail Transfer S...
-   [OK]          replies 0             30   250-foo.com greets bar.com...
-   [OK]          replies 0             31   250 OK.
-   [OK]          replies 0             32   250 OK.
-   [OK]          replies 0             33   550 No such user here.
-   [OK]          replies 0             34   250 OK.
-   [OK]          replies 0             35   354 Start mail input; end with <CR...
-   [OK]          replies 0             36   250 OK.
-   [OK]          replies 0             37   221 foo.com Service closing transm...
-   [OK]          replies 0             38   666 Going to Hell!.
-   [OK]          replies 1              0   (220 [foo.com Simple Mail Transfer...
-   [OK]          replies 1              1   (250 [foo.com greets bar.com; 8BIT...
-   [OK]          replies 1              2   (250 [Mark Crispin <Admin.MRC@foo....
-   [OK]          replies 1              3   (250 [OK]).
-   [OK]          replies 1              4   (250 [OK]).
-   [OK]          replies 1              5   (354 [Start mail input; end with <...
-   [OK]          replies 1              6   (250 [OK]).
-   [OK]          replies 1              7   (221 [foo.com Service closing tran...
-   [OK]          replies 1              8   (220 [xyz.com Simple Mail Transfer...
-   [OK]          replies 1              9   (250 [xyz.com is on the air]).
-   [OK]          replies 1             10   (250 [OK]).
-   [OK]          replies 1             11   (250 [OK]).
-   [OK]          replies 1             12   (354 [Start mail input; end with <...
-   [OK]          replies 1             13   (250 [OK]).
-   [OK]          replies 1             14   (221 [foo.com Service closing tran...
-   [OK]          replies 1             15   (220 [foo.com Simple Mail Transfer...
-   [OK]          replies 1             16   (250 [foo.com greets bar.com; 8BIT...
-   [OK]          replies 1             17   (250 [OK]).
-   [OK]          replies 1             18   (250 [OK]).
-   [OK]          replies 1             19   (354 [Start mail input; end with <...
-   [OK]          replies 1             20   (250 [OK]).
-   [OK]          replies 1             21   (221 [foo.com Service closing tran...
-   [OK]          replies 1             22   (220 [foo.com Simple Mail Transfer...
-   [OK]          replies 1             23   (250 [foo.com greets bar.com; 8BIT...
-   [OK]          replies 1             24   (250 [OK]).
-   [OK]          replies 1             25   (250 [OK]).
-   [OK]          replies 1             26   (550 [No such user here]).
-   [OK]          replies 1             27   (250 [OK]).
-   [OK]          replies 1             28   (221 [foo.com Service closing tran...
-   [OK]          replies 1             29   (220 [foo.com Simple Mail Transfer...
-   [OK]          replies 1             30   (250 [foo.com greets bar.com; 8BIT...
-   [OK]          replies 1             31   (250 [OK]).
-   [OK]          replies 1             32   (250 [OK]).
-   [OK]          replies 1             33   (550 [No such user here]).
-   [OK]          replies 1             34   (250 [OK]).
-   [OK]          replies 1             35   (354 [Start mail input; end with <...
-   [OK]          replies 1             36   (250 [OK]).
-   [OK]          replies 1             37   (221 [foo.com Service closing tran...
-   [OK]          replies 1             38   (666 [Going to Hell!]).
-   [OK]          malformed 354          0   malformed 354.
- 
- Full test results in `~/.opam/4.14/.opam-switch/build/colombe.0.6.0/_build/default/test/_build/_tests/colombe'.
- Test Successful in 0.021s. 139 tests run.
- (cd _build/default/fuzz && ./fuzz.exe)
- never raise (request): PASS
- 
- never raise (reply): PASS
- 
- x = encoder(decoder(x)) (request): PASS
- 
- x = decoder(encoder(x)) (request): PASS
- 
- x = encoder(decoder(x)) (reply): PASS
- 
- x = decoder(encoder(x)) (reply): PASS
- 
-> compiled  colombe.0.6.0
-> removed   colombe.0.6.0
-> installed colombe.0.6.0
Done.
# To update the current shell environment, run: eval $(opam env)
2026-01-13 19:21.42 ---> saved as "9ed1f07da838ebb80fb4819acafcebd9c56c953278ae2603c83b2025e3fa7464"
Job succeeded
2026-01-13 19:22.01: Job succeeded