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ocaml / opam

opam is a source-based package manager. It supports multiple simultaneous compiler installations, flexible package constraints, and a Git-friendly development workflow.
https://opam.ocaml.org
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intial draft NixOS depext support #5942

Closed RyanGibb closed 4 months ago

RyanGibb commented 5 months ago

This addresses https://github.com/ocaml/opam/issues/5124 and stems from conversations in https://github.com/ocaml/opam/pull/5332.

This is an initial draft to get a conversation started.

Nix's declarative deployment model doesn't match the semantics of the other package managers opam invokes, so it requires some special treatment to be supported.

From conversations on https://github.com/ocaml/opam/pull/5332 the most flexible approach is to create a shell.nix and allow the user to decide how to provide the dependencies, such as invoking nix-shell.

This has some limitations, like if the shell is destroyed, and the packages are garbage collected, things will break. For more permanent deployment https://github.com/tweag/opam-nix (or others) can be used to create Nix derivations for opam projects. But this should be sufficient to get depexts on NixOS working for a development environment using an opam switch.

This could possibly also be adapted for Guix.

RyanGibb commented 4 months ago

I'm going to close this in favour of creating a Nix shell like environment which Opam can set the environment variables for: https://github.com/RyanGibb/nix.opam