cabal2nix --shell doesn't include libraryToolDepends in environment

[mpickering]

My workflow is usually

cabal2nix --shell . > shell.nix
nix-shell
cabal configure
cabal build

If the project uses happy or alex then these are not available in the shell environment as libraryToolDepends is not part of propagatedBuildInputs.

[peti]

I cannot re-produce this issue (on master):

nix-shell "<nixpkgs>" --pure -A haskellPackages.ViennaRNA-bindings --run "type -pa c2hs"
/nix/store/pm7fq77pzyprwkp8vbw5cqqc9raimn58-c2hs-0.26.2-28-g8b79823/bin/c2hs
/nix/store/pm7fq77pzyprwkp8vbw5cqqc9raimn58-c2hs-0.26.2-28-g8b79823/bin/c2hs

The build tool c2hs shows up in $PATH. Generally speaking, the environment contains systemBuildInputs, not propagatedBuildInputs.

[mpickering]

https://gist.github.com/1f6d8fbf4b3d178c33c0a23b1f6f831a

I am starting with cogent.cabal. shell.nix is the generated shell.nix file with a lot of the dependencies removed (it still fails with the generated file). After running nix-shell, alex is not available on the command line.

[peti]

This is all very confusing. Anyway, I've committed a fix in NixOS/nixpkgs@bd3379c. I hope it works okay. :-)