opam 2.0.1 is out!

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We are pleased to announce the release of opam 2.0.1.

This new version contains mainly backported fixes, some platform-specific:

• Cold boot for MacOS/CentOS/Alpine
• Install checksum validation on MacOS
• Archive extraction for OpenBSD now defaults to using gtar
• Fix compilation of mccs on MacOS and Nix platforms
• Do not use GNU-sed specific features in the release Makefile, to fix build on OpenBSD/FreeBSD
• Cleaning to enable reproducible builds
• Update configure scripts

And some opam specific:

• git: fix git fetch by sha1 for git < 2.14
• linting: add test variable warning and empty description error
• upgrade: convert pinned but not installed opam files
• error reporting: more comprehensible error message for tar extraction, and upgrade of git-url compilers
• opam show: upgrade given local files
• list: as opam 2.0.0 list doesn't return non-zero code if list is empty, add --silent option for a silent output and returns 1 if list is empty

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Installation instructions (unchanged):

1. From binaries: run

sh <(curl -sL https://raw.githubusercontent.com/ocaml/opam/master/shell/install.sh)

or download manually from the Github "Releases" page to your PATH. In this case, don't forget to run opam init --reinit -ni to enable sandboxing if you had version 2.0.0~rc manually installed.

2. From source, using opam:

opam update; opam install opam-devel

(then copy the opam binary to your PATH as explained, and don't forget to run opam init --reinit -ni to enable sandboxing if you had version 2.0.0~rc manually installed)

3. From source, manually: see the instructions in the README.

We hope you enjoy this new major version, and remain open to bug reports and suggestions.

NOTE: this article is cross-posted on opam.ocaml.org and ocamlpro.com.

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About OCamlPro:

OCamlPro is a R&D lab founded in 2011, with the mission to help industrial users benefit from state-of-the art programming languages like OCaml and Rust.

We design, create and implement custom ad-hoc software for our clients. We also have a long experience in developing and maintaining open-source tooling for OCaml, such as Opam, TryOCaml, ocp-indent, ocp-index and ocp-browser, and we contribute to the core-development of OCaml, notably with our work on the Flambda optimizer branch.

Another area of expertise is that of Formal Methods, with tools such as our SMT Solver Alt-Ergo (check our Alt-Ergo Users'). We also provide vocational trainings in OCaml and Rust, and we can build courses on formal methods on-demand. Please reach out, we'll be delighted to discuss your challenges: contact@ocamlpro.com or book a quick discussion.