opam 2.0.2 release

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We are pleased to announce the release of opam 2.0.2.

As sandbox scripts have been updated, don't forget to run opam init --reinit -ni to update yours.

This new version contains mainly backported fixes:

• Doc:
  • update man page
  • add message for deprecated options
  • reinsert removed ones to print a deprecated message instead of fail (e.g. --alias-of)
  • deprecate no-aspcud
• Pin:
  • on pinning, rebuild updated pin-depends packages reliably
  • include descr & url files on pinning 1.2 opam files
• Sandbox:
  • handle symlinks in bubblewrap for system directories such as /bin or /lib (#3661). Fixes sandboxing on some distributions such as CentOS 7 and Arch Linux.
  • allow use of unix domain sockets on macOS (#3659)
  • change one-line conditional to if statement which was incompatible with set -e
  • make /var readonly instead of empty and rw
• Path: resolve default opam root path
• System: suffix .out for read_command_output stdout files
• Locked: check consistency with opam file when reading lock file to suggest regeneration message
• Show: remove pin depends messages
• Cudf: Fix closure computation in the presence of cycles to have a complete graph if a cycle is present in the graph (typically ocaml-base-compiler ⇄ ocaml)
• List: Fix some cases of listing coinstallable packages
• Format upgrade: extract archived source files of version-pinned packages
• Core: add is_archive in OpamSystem and OpamFilename
• Init: don't fail if empty compiler given
• Lint: fix light_uninstall flag for error 52
• Build: partial port to dune
• Update cold compiler to 4.07.1

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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 or to update your sandbox script.

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 or to update you sandbox script)

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

We hope you enjoy this new minor 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 experts with a state-of-the-art knowledge of programming languages theory and practice.

• We provide audit, support, custom developer tools and training for both the most modern languages, such as Rust, Wasm and OCaml, and for legacy languages, such as COBOL or even home-made domain-specific languages;
• We design, create and implement software with great added-value for our clients. High complexity is not a problem for our PhD-level experts. For example, we helped the French Income Tax Administration re-adapt and improve their internally kept M language, we designed a DSL to model and express revenue streams in the Cinema Industry, codename Niagara, and we also developed the prototype of the Tezos proof-of-stake blockchain from 2014 to 2018.
• We have a long history of creating open-source projects, such as the Opam package manager, the LearnOCaml web platform, and contributing to other ones, such as the Flambda optimizing compiler, or the GnuCOBOL compiler.
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