Overriding a haskell package in flakes

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1

I’m trying to compile a project using the ghc-wasm-meta compiler, sadly, it doesn’t support Template Haskell and one of the main packages I’m importing is singletons-base, which depends on a couple of TH libraries.

So I took the time of de-templating the whole project via a fork, and now I’m trying to override the package source using this flake

Nevertheless I’m getting the following error:

error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:9:12:
            8|
            9|   strict = derivationStrict drvAttrs;
             |            ^
           10|

       … while evaluating derivation 'haskell-template'
         whose name attribute is located at /nix/store/1fzvh581hp63syzq2q10i6763b98ckbw-source/pkgs/stdenv/generic/make-derivation.nix:334:7

       … while evaluating attribute 'nativeBuildInputs' of derivation 'haskell-template'
         at /nix/store/1fzvh581hp63syzq2q10i6763b98ckbw-source/pkgs/stdenv/generic/make-derivation.nix:378:7:
          377|       depsBuildBuild              = elemAt (elemAt dependencies 0) 0;
          378|       nativeBuildInputs           = elemAt (elemAt dependencies 0) 1;
             |       ^
          379|       depsBuildTarget             = elemAt (elemAt dependencies 0) 2;

       … while evaluating definitions from `/nix/store/kr229gv03s66bifpbhyxjai4wyky79df-source/nix/modules/project/settings/all.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: builder for '/nix/store/p9jx16dpa1ypwl48x0m9gmgq9q62irkl-cabal2nix-singletons.drv' failed with exit code 1;
       last 16 log lines:
       > sourcing setup hook '/nix/store/yq6n8b0mnk0qxzbs3ajsjcp8ziwqylrl-patchelf-0.15.0/nix-support/setup-hook'
       > sourcing setup hook '/nix/store/iks1pihvbilsh5sy8qvpd638k422w9i8-update-autotools-gnu-config-scripts-hook/nix-support/setup-hook'
       > sourcing setup hook '/nix/store/h9lc1dpi14z7is86ffhl3ld569138595-audit-tmpdir.sh'
       > sourcing setup hook '/nix/store/m54bmrhj6fqz8nds5zcj97w9s9bckc9v-compress-man-pages.sh'
       > sourcing setup hook '/nix/store/wgrbkkaldkrlrni33ccvm3b6vbxzb656-make-symlinks-relative.sh'
       > sourcing setup hook '/nix/store/5yzw0vhkyszf2d179m0qfkgxmp5wjjx4-move-docs.sh'
       > sourcing setup hook '/nix/store/fyaryjvghbkpfnsyw97hb3lyb37s1pd6-move-lib64.sh'
       > sourcing setup hook '/nix/store/kd4xwxjpjxi71jkm6ka0np72if9rm3y0-move-sbin.sh'
       > sourcing setup hook '/nix/store/pag6l61paj1dc9sv15l7bm5c17xn5kyk-move-systemd-user-units.sh'
       > sourcing setup hook '/nix/store/jivxp510zxakaaic7qkrb7v1dd2rdbw9-multiple-outputs.sh'
       > sourcing setup hook '/nix/store/ilaf1w22bxi6jsi45alhmvvdgy4ly3zs-patch-shebangs.sh'
       > sourcing setup hook '/nix/store/cickvswrvann041nqxb0rxilc46svw1n-prune-libtool-files.sh'
       > sourcing setup hook '/nix/store/xyff06pkhki3qy1ls77w10s0v79c9il0-reproducible-builds.sh'
       > sourcing setup hook '/nix/store/ngg1cv31c8c7bcm2n8ww4g06nq7s4zhm-set-source-date-epoch-to-latest.sh'
       > sourcing setup hook '/nix/store/gps9qrh99j7g02840wv5x78ykmz30byp-strip.sh'
       > cabal2nix: user error (*** Found neither a .cabal file nor package.yaml. Exiting.)

does anybody have an idea on why is this happening?

2

I didn’t look at the details, but this is a pretty good lead, isn’t it?

3

pretty confusing imo, the singletons project has a cabal.project at the root, and each folder has a something.cabal.

The singletons project compiles on its own, but I’m not sure why I’m not able to import it using the flake :frowning: