Support local tarballs

[phadej]

i.e.

packages: foo/bar/my-package.tar.gz

I was told this is unsupported, and it's annoying where there is no public git repository nor package is on Hackage, as local unpacked package is never cached etc.

[hamishmack]

First step would be to check check what is in the plan.json file in for these (we can get that from project.plan-nix.json or dist-newstyle/build/cache/plan.json). Then we would probably need to update plan-to-nix in nix-tools and probably haskell.nix. I think nix is happy if src points to a .tar.gz file so if plan.json has the path and we can get it into the output of plan-to-nix it might just work.

[phadej]

plan.json does have a path, e.g.

            "id": "hooglite-0.20211229-a6e1a5718903b4e4da4ebbd2a35aeb9bbbfe168ba93c516286773eea6aae09f5",
            "pkg-name": "hooglite",
            "pkg-src": {
                "path": "/code/public-haskell/cabal-extras/extras/hooglite-0.20211229.tar.gz",
                "type": "local-tar"
            },

See also https://hackage.haskell.org/package/cabal-plan-0.7.2.1/docs/Cabal-Plan.html#t:PkgLoc

[codygman]

Is there any workaround for this? Maybe somehow adding the vendored files to the source?

[phadej]

@codygman vendored files would be local packages, so not cached/shared by cabal-install. So no, that is not really a workaround.

[L-as]

You can use https://github.com/mlabs-haskell/haskell-nix-extra-hackage as a workaround

[phadej]

I don't know Nix so I don't know how to use that. I work on a project where others use haskell.nix, and I just want nix develop to work. I'll point it to that workaround, thanks.