2025-08-26 11:59.46: New job: Build using linux-x86_64 in
                                [https://github.com/mirage/mirage-skeleton.git#refs/heads/dev (924fa1b6e311f53d719a3dab1546ea9b43145398)]

OBuilder spec:

((from ocaml/opam:debian-10-ocaml-5.2)
 (user (uid 1000) (gid 1000))
 (workdir /home/opam)
 (run (shell "sudo chown opam:opam /home/opam"))
 (run (shell "sudo ln -f /usr/bin/opam-2.1 /usr/bin/opam && opam update"))
 (run (network host)
      (shell "opam repo add opam https://github.com/ocaml/opam-repository.git#4c972ba0fc24bcf3f84a30d19f8d725f7ce382a4"))
 (run (network host)
      (shell "opam repo add mirage-dev https://github.com/mirage/mirage-dev.git#eb114ccf0dd4eeca6b4f06c5c7361c238eeca4fd"))
 (run (network host)
      (shell "opam pin -ny https://github.com/mirage/mirage.git#49dceb966f557be3664b5c0f4eced8385190c4d1"))
 (run (cache (download-cache (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "sudo apt-get update && opam install -y \"mirage>=4\""))
 (copy (src .) (dst /src/))
 (env MODE hvt)
 (workdir /src/)
 (run (shell "opam exec -- make configure"))
 (env MIRAGE_EXTRA_REPOS opam-overlays:https://github.com/dune-universe/opam-overlays.git#e031bb64e33bf93be963e9a38b28962e6e14381f,mirage-opam-overlays:https://github.com/dune-universe/mirage-opam-overlays.git#797cb363df3ff763c43c8fbec5cd44de2878757e)
 (run (network host)
      (shell "opam exec -- make lock"))
 (run (cache (download-cache (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "sudo apt-get update && opam exec -- make depends"))
 (run (shell "opam monorepo list -l mirage.opam.locked"))
 (run (cache (download-cache (target /home/opam/.opam/download-cache)))
      (network host)
      (shell "opam exec -- make pull"))
 (env DUNE_CACHE enabled)
 (env DUNE_CACHE_TRANSPORT direct)
 (run (cache (dune-build-cache (target /home/opam/.cache/dune)))
      (network host)
      (shell "opam exec -- make build"))
)

2025-08-26 11:59.46: Using cache hint "mirage-ci-skeleton-debian-10-ocaml-5.2"
2025-08-26 11:59.46: Waiting for resource in pool OCluster
2025-08-26 11:59.46: Waiting for worker…
2025-08-26 12:03.28: Got resource from pool OCluster
Building on odawa.caelum.ci.dev
All commits already cached
HEAD is now at 924fa1b defunctorised versions of unikernels (#407)

(from ocaml/opam:debian-10-ocaml-5.2)
2025-08-26 12:03.28 ---> using "752a856dc0534d8bc120f716770ce56b356e0038b43f4a4cd8984ba0735684e4" from cache

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo chown opam:opam /home/opam"))
2025-08-26 12:03.28 ---> using "0f5e656a2ed5cbea7671c38eb0719b93d7366fc382509556b14b9efdaffe3b8b" from cache

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-2.1 /usr/bin/opam && opam update"))
This version of opam requires an update to the layout of /home/opam/.opam from version 2.0 to version 2.1, which can't be reverted.
You may want to back it up before going further.

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

<><> Updating package repositories ><><><><><><><><><><><><><><><><><><><><><><>
[default] synchronised from file:///home/opam/opam-repository
2025-08-26 12:04.20 ---> saved as "f49c317111a642676c09c01bc919af8812f6a51ed5ff16776f360ee3839c99a5"

/home/opam: (run (network host)
                 (shell "opam repo add opam https://github.com/ocaml/opam-repository.git#4c972ba0fc24bcf3f84a30d19f8d725f7ce382a4"))
[opam] Initialised
[NOTE] Repository opam has been added to the selections of switch 5.2 only.
       Run `opam repository add opam --all-switches|--set-default' to use it in all existing switches, or in newly created switches, respectively.

2025-08-26 12:05.02 ---> saved as "adaf0d3b9f0cf1ed4283375e4bd58cdba6cdb3f20a50d36748f81af16745019c"

/home/opam: (run (network host)
                 (shell "opam repo add mirage-dev https://github.com/mirage/mirage-dev.git#eb114ccf0dd4eeca6b4f06c5c7361c238eeca4fd"))
[mirage-dev] Initialised
[NOTE] Repository mirage-dev has been added to the selections of switch 5.2 only.
       Run `opam repository add mirage-dev --all-switches|--set-default' to use it in all existing switches, or in newly created switches, respectively.

2025-08-26 12:05.04 ---> saved as "585a9b47de588afe4a943f0f36887f74fdba6442f2b9ec75d2fe9a76a6c6f5f5"

/home/opam: (run (network host)
                 (shell "opam pin -ny https://github.com/mirage/mirage.git#49dceb966f557be3664b5c0f4eced8385190c4d1"))
This will pin the following packages: mirage-runtime, mirage. Continue? [Y/n] y
mirage-runtime is now pinned to git+https://github.com/mirage/mirage.git#49dceb966f557be3664b5c0f4eced8385190c4d1 (version 4.9.0)
mirage is now pinned to git+https://github.com/mirage/mirage.git#49dceb966f557be3664b5c0f4eced8385190c4d1 (version 4.9.0)
2025-08-26 12:05.10 ---> saved as "af9c8ad0718ca8d09034212630d825b6bdd1037eba02dac7c8036c0497e68fe8"

/home/opam: (run (cache (download-cache (target /home/opam/.opam/download-cache)))
                 (network host)
                 (shell "sudo apt-get update && opam install -y \"mirage>=4\""))
Ign:1 http://deb.debian.org/debian buster InRelease
Ign:2 http://deb.debian.org/debian-security buster/updates InRelease
Ign:3 http://deb.debian.org/debian buster-updates InRelease
Err:4 http://deb.debian.org/debian buster Release
  404  Not Found [IP: 146.75.74.132 80]
Err:5 http://deb.debian.org/debian-security buster/updates Release
  404  Not Found [IP: 146.75.74.132 80]
Err:6 http://deb.debian.org/debian buster-updates Release
  404  Not Found [IP: 146.75.74.132 80]
Reading package lists...
E: The repository 'http://deb.debian.org/debian buster Release' no longer has a Release file.
E: The repository 'http://deb.debian.org/debian-security buster/updates Release' no longer has a Release file.
E: The repository 'http://deb.debian.org/debian buster-updates Release' no longer has a Release file.
"/usr/bin/env" "bash" "-c" "sudo apt-get update && opam install -y "mirage>=4"" failed with exit status 100
2025-08-26 12:05.11: Job failed: Failed: Build failed