Re: [MirageOS-devel] [ANN] mirage 3.7 release

[Hannes Mehnert <hannes@xxxxxxxxxxx>]

Hello,

after a few more releases (of the core signature packages, now including
a Mirage_yy_lwt module), the only breaking change is now:
- The hooks previously in
OS.Main.at_enter/at_enter_iter/at_exit/at_exit_iter are now part of
Mirage_runtime (only used in mirage-entropy)

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
- 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).
- 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).


Happy hacking,

hannes

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