doctest-driver-gen fails in checks and tests

[dhess]

It appears that ghc can't find the doctest-driver-gen driver. Here's a repo that demonstrates the issue:

https://github.com/hackworthltd/haskell-hacknix/tree/doctest

nix-build default.nix -A hhp.check
...
Preprocessing library for hhp-1.0.0.0..
Building library for hhp-1.0.0.0..
Preprocessing test suite 'doctest' for hhp-1.0.0.0..
Building test suite 'doctest' for hhp-1.0.0.0..
building
[1 of 1] Compiling MyLib
Preprocessing test suite 'hlint' for hhp-1.0.0.0..
Building test suite 'hlint' for hhp-1.0.0.0..
ghc: could not execute: doctest-driver-gen
builder for '/nix/store/2wb7hyps5mmg0ks483xzi02nqk9larg7-hhp-1.0.0.0-test-doctest.drv' failed with exit code 1
cannot build derivation '/nix/store/1bgjla92hcj3md46wjkvf073dr5y4wjq-hhp-1.0.0.0-test-doctest-check.drv': 1 dependencies couldn't be built
error: build of '/nix/store/1bgjla92hcj3md46wjkvf073dr5y4wjq-hhp-1.0.0.0-test-doctest-check.drv', '/nix/store/4935cmsw6kxvi9nhkh8k4syhvi0cv2iq-hhp-1.0.0.0-test-hhp-test-check.drv', '/nix/store/b3wc4c179gd6h7izl2ri0l1f1z64dirq-hhp-1.0.0.0-test-hlint-check.drv' failed

[hamishmack]

Can you please try out #427 and let us know if it works for your case? You will need to add something like this this and you may need the nonReinstallablePkgs bit too.

[dhess]

Thanks for the suggestion. I'm afraid it made no difference in my case.

See https://github.com/hackworthltd/haskell-hacknix/compare/doctest...support-cabal-doctest for the changes I made for this test.

[cdepillabout]

@dhess You'll need to actually use cabal-doctest to run the doctests.

[dhess]

Duh. Sorry, I completely missed that. I've never used it, so I'll need to find a bit of time to adapt the project.

[dhess]

I attempted to convert the project to use cabal-doctest but it's having a different issue, now. Rather than go through that here, since it's not relevant to doctest-driver-gen anymore, I'll post something at #427

[hamishmack]

I think cabal-doctest support works reasonably well now. See https://github.com/input-output-hk/haskell.nix/tree/master/test/cabal-doctests for an example. Please reopen if doctest-driver-gen support is still needed.