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We are happy to announce the first beta release of opam 2.5.0. You can view the full list of changes in the release note.

This version is a beta, we invite users to test it to spot previously unnoticed bugs as we head towards the stable release.

Try it!

The upgrade instructions are unchanged:

1. Either from binaries: run

For Unix systems

bash -c "sh <(curl -fsSL https://opam.ocaml.org/install.sh) --version 2.5.0~beta1"

or from PowerShell for Windows systems

Invoke-Expression "& { $(Invoke-RestMethod https://opam.ocaml.org/install.ps1) } -Version 2.5.0~beta1"

or download manually from the Github "Releases" page to your PATH.

1. Or from source, manually: see the instructions in the README.

You should then run:

opam init --reinit -ni

Changes

• Allow the macOS sandbox to write in the /var/folders/ and /var/db/mds/ directories as it is required by some macOS core tools (#4389, #6460)
• Stop opam switch create --dry-run from creating any directory. Thanks to @hannesm for this contribution. (#5918)
• Stop cleaning the build directory when installing packages with --dry-run. Thanks to @hannesm for this contribution. (#6540)

Regression fixes from 2.5.0~alpha1

• Fixed a bug occurring on version-equivalent package rename (i.e. pkg.00 -> pkg.0) leading to the package being completely removed (#6754)

Build changes

• opam no longer depends on cmdliner. This change allows cmdliner 2.0.0 to be co-installable with opam-installer and the opam-client library (#6425)
• Allow building opam using the upcoming OCaml 5.5 (trunk) when using dune's dev profile (#6670)
• Clean variables before calling make on different projects (e.g. downloaded-if-missing OCaml compiler) to avoid clashes with other variables set by these projects (#6769)

API changes are also denoted in the release note linked above. This release also includes a couple of improvement and extensions to our testsuite.

Please report any issues to the bug-tracker.

Happy hacking!