2026-01-27 10:32.55: New job: Build using linux-x86_64 in
                                [https://github.com/mirage/mirage-skeleton.git#refs/heads/dev (f89ae9e1a80eaf983622cc8c192c1214b219b9e0)]

OBuilder spec:

((from ocaml/opam:debian-13-ocaml-5.3)
 (user (uid 1000) (gid 1000))
 (workdir /home/opam)
 (run (shell "sudo chown opam:opam /home/opam"))
 (run (shell "sudo ln -f /usr/bin/opam-2.4 /usr/bin/opam && opam update"))
 (run (network host)
      (shell "opam repo add opam https://github.com/ocaml/opam-repository.git#da10f1e072f9cf90a6e65dbf66e23531bae678b3"))
 (run (network host)
      (shell "opam repo add mirage-dev https://github.com/mirage/mirage-dev.git#eb114ccf0dd4eeca6b4f06c5c7361c238eeca4fd"))
 (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 unix)
 (workdir /src/)
 (run (shell "opam exec -- make configure"))
 (env MIRAGE_EXTRA_REPOS opam-overlays:https://github.com/dune-universe/opam-overlays.git#12731a6f86d7c452a94c72106fa9d3327988582d,mirage-opam-overlays:https://github.com/dune-universe/mirage-opam-overlays.git#eddcd1bc7e035392596b603d23dde67a88e6f6bc)
 (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"))
)

2026-01-27 10:32.55: Using cache hint "mirage-ci-skeleton-debian-13-ocaml-5.3"
2026-01-27 10:32.55: Waiting for resource in pool OCluster
2026-01-27 10:32.56: Waiting for worker…
2026-01-27 10:38.35: Got resource from pool OCluster
Building on bremusa.ocamllabs.io
All commits already cached
HEAD is now at f89ae9e Merge pull request #419 from hannesm/fmt

(from ocaml/opam:debian-13-ocaml-5.3)
2026-01-27 10:50.41 ---> saved as "348716d62ad55d1c2ba7493d00b0882cc64fc042d724a06a1599e8ba58d890e2"

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

/: (workdir /home/opam)

/home/opam: (run (shell "sudo chown opam:opam /home/opam"))
2026-01-27 10:50.41 ---> saved as "24883da7c3bfb9b4beffcac7267b86c1389006a753d78f6b386a3c4fd0e70458"

/home/opam: (run (shell "sudo ln -f /usr/bin/opam-2.4 /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 2.2, 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] Initialised
2026-01-27 11:04.11 ---> saved as "e0d08704d663585a0eeeaa1114187809c41cb285481ac9f5195ea2884586d4b3"

/home/opam: (run (network host)
                 (shell "opam repo add opam https://github.com/ocaml/opam-repository.git#da10f1e072f9cf90a6e65dbf66e23531bae678b3"))
[opam] Initialised
"/usr/bin/env" "bash" "-c" "opam repo add opam https://github.com/ocaml/opam-repository.git#da10f1e072f9cf90a6e65dbf66e23531bae678b3" failed with exit status 137
2026-01-27 11:10.58: Job failed: Failed: Build failed