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Building on c2-3.ocamllabs.io

(from ocaml/opam:debian-unstable@sha256:5d9d58dd88e8e3a7a3c180578c753118efcfd5a451781452c6731c99fc9e27dd)
Unable to find image 'ocaml/opam:debian-unstable@sha256:5d9d58dd88e8e3a7a3c180578c753118efcfd5a451781452c6731c99fc9e27dd' locally
docker.io/ocaml/opam@sha256:5d9d58dd88e8e3a7a3c180578c753118efcfd5a451781452c6731c99fc9e27dd: Pulling from ocaml/opam
e87d5c51a17c: Pulling fs layer
e87d5c51a17c: Verifying Checksum
e87d5c51a17c: Download complete
e87d5c51a17c: Pull complete
Digest: sha256:5d9d58dd88e8e3a7a3c180578c753118efcfd5a451781452c6731c99fc9e27dd
Status: Downloaded newer image for ocaml/opam@sha256:5d9d58dd88e8e3a7a3c180578c753118efcfd5a451781452c6731c99fc9e27dd
2022-11-15 08:44.35 ---> using "32efe2878d8713cc073fbcba05b477fab5020dac81ac1f841ea37ae67b4d70a6" from cache

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

/: (env OPAMPRECISETRACKING 1)

/: (env OPAMUTF8 never)

/: (env OPAMEXTERNALSOLVER builtin-0install)

/: (env OPAMCRITERIA +removed)

/: (run (shell "sudo ln -f /usr/bin/opam-dev /usr/bin/opam"))
2022-11-15 08:44.35 ---> using "c06b21e9e23147ff65065b0caeb2932b761f6e4408d2fb429e6eafaede540fdc" from cache

/: (run (network host)
        (shell "rm -rf ~/opam-repository && git clone -q 'https://github.com/ocaml/opam-repository' ~/opam-repository && git -C ~/opam-repository checkout -q 88d0c6b952c255f868635fbb4c8bc650f1fa4fd8"))
2022-11-15 08:44.35 ---> using "f5ff03689bfa4493e0d56b41d99787e727484001ba6ca3d348cc9bb14b0a105c" from cache

/: (run (shell "rm -rf ~/.opam && opam init -ya --bare --config ~/.opamrc-sandbox ~/opam-repository"))
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.


<><> Fetching repository information ><><><><><><><><><><><><><><><><><><><><><>
[default] Initialised

User configuration:
  ~/.profile is already up-to-date.
[NOTE] Make sure that ~/.profile is well sourced in your ~/.bashrc.

2022-11-15 08:44.35 ---> using "c8ce34507d61810fd57bc948c6ee6daad97dafa9d9e05febabf80edf14a81a6c" from cache

/: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
        (network host)
        (shell "opam switch create --repositories=default '4.04' '4.04.2'"))

<><> Installing new switch packages <><><><><><><><><><><><><><><><><><><><><><>
Switch invariant: ["ocaml-base-compiler" {= "4.04.2"} | "ocaml-system" {= "4.04.2"}]

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> installed base-bigarray.base
-> installed base-threads.base
-> installed base-unix.base
-> retrieved ocaml-base-compiler.4.04.2  (https://github.com/ocaml/ocaml/archive/4.04.2.tar.gz)
-> installed ocaml-base-compiler.4.04.2
-> installed ocaml-config.1
-> installed ocaml.4.04.2
Done.
# Run eval $(opam env --switch=4.04) to update the current shell environment
2022-11-15 08:44.35 ---> using "d7f581f11cca5eda289e2151bf14ec8df5e6d959c29b6864197eed85fc7e48ac" from cache

/: (run (network host)
        (shell "opam update --depexts"))
+ /usr/bin/sudo "apt-get" "update"
- Get:1 http://deb.debian.org/debian unstable InRelease [161 kB]
- Get:2 http://deb.debian.org/debian unstable/main amd64 Packages.diff/Index [63.6 kB]
- Get:3 http://deb.debian.org/debian unstable/main amd64 Packages T-2022-11-15-0207.35-F-2022-11-08-2013.29.pdiff [530 kB]
- Get:3 http://deb.debian.org/debian unstable/main amd64 Packages T-2022-11-15-0207.35-F-2022-11-08-2013.29.pdiff [530 kB]
- Fetched 755 kB in 2s (410 kB/s)
- Reading package lists...
- 
2022-11-15 08:44.35 ---> using "a9096cb7371739a73345669333e5de322add9550d1b1890eb8876d4d45703e8a" from cache

/: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
        (network host)
        (shell "opam install -y ocaml-secondary-compiler"))
The following actions will be performed:
=== install 1 package
  - install ocaml-secondary-compiler 4.08.1-1

<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved ocaml-secondary-compiler.4.08.1-1  (cached)
-> installed ocaml-secondary-compiler.4.08.1-1
Done.
# Run eval $(opam env) to update the current shell environment
2022-11-15 08:44.35 ---> using "09d9a91f887c4b53207707303a06311769625a35b50854d789918c899e8bd57c" from cache

/: (run (cache (opam-archives (target /home/opam/.opam/download-cache)))
        (network host)
        (shell  "\
               \nopam remove -y \"async_sendfile.v0.15.0\"\
               \nopam install -vy \"async_sendfile.v0.15.0\"\
               \nres=$?\
               \nif [ $res = 31 ]; then\
               \n    if opam show -f x-ci-accept-failures: \"async_sendfile.v0.15.0\" | grep -q '\"debian-unstable\"'; then\
               \n        echo \"This package failed and has been disabled for CI using the 'x-ci-accept-failures' field.\"\
               \n        exit 69\
               \n    fi\
               \nfi\
               \n\
               \n\
               \nexit $res\
               \n"))
[NOTE] async_sendfile.v0.15.0 is not installed.

Nothing to do.
[ERROR] Package conflict!
  * No agreement on the version of ocaml:
    - (invariant) -> ocaml-base-compiler = 4.04.2 -> ocaml = 4.04.2
    - async_sendfile >= v0.15.0 -> ocaml >= 4.08.0
    You can temporarily relax the switch invariant with `--update-invariant'
  * No agreement on the version of ocaml-base-compiler:
    - (invariant) -> ocaml-base-compiler = 4.04.2
    - async_sendfile >= v0.15.0 -> ocaml >= 4.08.0 -> ocaml-base-compiler = 4.08.0
  * Missing dependency:
    - async_sendfile >= v0.15.0 -> ocaml >= 4.08.0 -> ocaml-variants >= 4.08.0 -> ocaml-beta
    unmet availability conditions: 'enable-ocaml-beta-repository'

No solution found, exiting
'opam install -vy async_sendfile.v0.15.0' failed.
"/bin/bash" "-c"
"
opam remove -y "async_sendfile.v0.15.0"
opam install -vy "async_sendfile.v0.15.0"
res=$?
if [ $res = 31 ]; then
    if opam show -f x-ci-accept-failures: "async_sendfile.v0.15.0" | grep -q '"debian-unstable"'; then
        echo "This package failed and has been disabled for CI using the 'x-ci-accept-failures' field."
        exit 69
    fi
fi


exit $res
" failed with exit status 20
Failed: Build failed