Is there a config/build tool similar to pythons poetry or elixirs mix or erlangs rebar3 that manages dependencies in a local “virtual environment” that sees only the dependencies specified? That also works with a lock file for full reproducability of the dev environment?

Esy doesn’t work in NixOS even if packaged, because it relies on the ability to fetch and build dependencies outside of the nixpkgs repository. As one might expect, many system dependencies are either not correctly specified or not specified at all, which leads to a pretty bad experience. So here’s…

There’s esy although it’s not 1.0 yet.

opam also supports virtual environments with “local switches” and – as of Opam 2.1 – built-in support for lock file generation. However, opam's lock files won’t get you truly reproducible builds since they don’t contain hashes of Opam packages (which can change by mutating either opam-repository or…

I’ve been using Esy for a few months now and it’s been solid. I especially like its Nix-style compilation cache–it avoids dependency recompiles even across projects.

I’m already using nix :wink: had some trouble using opam2nix the other day… Will try again!

Okay tried opam2nix again, no dice… https://gitlab.com/NobbZ/ocaml2nix-hello-example fails due to OCAMLTOP_INCLUDE_PATH: unbound variable when building dune, running nix-build directly in the examples/simple dir of opam2nix gives me OCAMLPATH: unbound variable when building cppo. The linked reposi…

Thanks for the tip, though esy is currently not packaged for nixOS, and from the PRs comment that tries to introduce it, it seems to be a rather complicated thing to add.

[image] CraigFe: opam also supports virtual environments with “local switches” and – as of Opam 2.1 – built-in support for lock file generation. Can you tell me more with examples about how to use that? I’m really interested in OCaml, though never really got my feets wet in it, as I never re…

basically navigate to your project and type opam switch create . This will create a local switch using the system version of ocaml. If you’re having trouble with it, I suggest installing a fresh version of ocaml in your switch : opam switch list-available #list available compilers opam switch cr…

[image] NobbZ: Can you tell me more with examples about how to use that? I’m really interested in OCaml, though never really got my feets wet in it, as I never really was able to even get simplest examples working. Even hello worlds were unable to build, because some “package” wasn’t found, whi…

Tool like python poetry or elixirs mix that makes use of exhaustive lockfiles?

Ecosystem

XVilka June 30, 2020, 4:43am 5

You can just use Nix whose config can be directly generated from the opam file with [ANN] opam2nix (v1).

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Tool like python poetry or elixirs mix that makes use of exhaustive lockfiles?

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