OCaml Weekly News

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Here is the latest OCaml Weekly News, for the week of November 05 to 12, 2019.

Table of Contents

Mirage 3.7.1 released

Hannes Mehnert announced

MirageOS 3.7.1 is released to opam repository now.

Breaking change:

Behaviour changes of MirageOS unikernels:

  • A unikernel now always calls the Mirage_runtime.at_exit registered hooks – once a unikernel succesfully executed its start in Lwt_main.run, exit 0 is called to ensure this behaviour https://github.com/mirage/mirage/pull/1011
  • Top-level exceptions are no longer caught (there used to be in mirage-unix/mirage-xen/mirage-solo5 custom handlers). The OCaml runtime prints the exception and backtrace on stdout and calls exit 2 (from 4.10.0, abort() will be called).

Deprecations (being removed from Mirage 4.0)

  • All Mirage_YYY_lwt are deprecated, Mirage_YYY interfaces are no longer astracted over 'a io and buffer. This reduces the amount of opam packages - mirage-yyy-lwt are no longer part of the release (each mirage-yyy package provides a Mirage_yyy_lwt module for backwards compatibility). Motivation was discussed in https://github.com/mirage/mirage/issues/1004
  • mirage-types and mirage-types-lwt are deprecated, please use the Mirage_YYY signatures directly instead.

Other observable changes

  • mirage configure now deletes all exising opam files

Most reverse dependencies are already released to opam, have a look at https://github.com/mirage/mirage/issues/1012 for progress (and the temporary https://github.com/mirage/mirage-dev.git#easy opam overlay).


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