opam - Platform Blog

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We are happy to announce the second alpha release of opam 2.4.0. You can view the full list of changes in the release note.

This version is an alpha, 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:

For Unix systems

bash -c "sh <(curl -fsSL https://opam.ocaml.org/install.sh) --version 2.4.0~alpha2"

or from PowerShell for Windows systems

Invoke-Expression "& { $(Invoke-RestMethod https://opam.ocaml.org/install.ps1) } -Version 2.4.0~alpha2"

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

You should then run:

opam init --reinit -ni

opam switch create [name] <version> will not include compiler packages flagged with avoid-version/deprecated in the generated invariant anymore (#6494). This will allow opam to avoid the use of the ocaml-system package unless actually explicitly requested by the user. The opam experience when the ocaml-system compiler is used is known to be prone to a variety of bugs and configuration issues.
Cygwin: Fallback to the existing setup-x86_64.exe if its upgrade failed to be fetched (#6495, partial fix for #6474)
Fix a memory leak happening when running large numbers of commands or opening large number of opam files (#6484). Thanks to @hannesm for this contribution
Remove handling of the OPAMSTATS environment variable (#6485). Thanks to @hannesm for this contribution

Fix a crash when updating a repository that is deleting or adding empty files. (#6448)
Fix an extreme performance issue (takes several hours) when applying a large repository update (#6448)
Fix a crash when updating a git repository that moved a file to a new directory (#6490)

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!