Hey hey, I’d like to list all the opam dependencies, and their versions, that my project requires. From that list, I’d like to create a dependency graph of all the transitive dependencies and figure out exact versions that will allow me to build the project. Is there a library to do this?

The solvers won’t differentiate between your project’s dependencies and the transitive dependencies pulled in by those. See, for example, the solutions which the ocaml-ci system computes for builds (e.g. for ocurrent’s master branch ). For getting the list of opam dependencies for a Dune project, th…

opam does it in an implicit way based on your own environment, which I’m not happy with. Ideally I want a library that I can use to do that work based on a configuration file (not based on my own switch, for example)

You could try Opam’s 0install solver library. Its documentation, including an example using the API with a local Opam package repository but no switch, is at opam-0install 0.4.3 · OCaml Package

A related library/tool is opam-graph - but it’s based on reading an opam switch export --full file. We use it to generate the dependency graph seen here: Job albatross 2022-05-10 19:53:40Z

my tool cannot rely on a switch being present. I don’t need a precise dependency graph, I wanted that to figure out a combination that would satisfy the constraints, but if opam can do that for me then it’s better :smiley:

How to compute dependency graph?

Ecosystem

yawaramin May 3, 2022, 9:51pm 2

Not a library but opam (CLI) can do it: opam-lock manpage

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How to compute dependency graph?

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