`doctest-parallel` error

[peterbecich]

Describe the bug
Reproduction here: https://github.com/peterbecich/doctest-parallel-issue

nix flake check produces this error, after some significant building time:

building
DocTests: <command line>: cannot satisfy -package ghc
    (use -v for more information)

The test suite uses doctest-parallel (https://hackage.haskell.org/package/doctest-parallel)

The error appears to be different than other DocTests issues: https://github.com/input-output-hk/haskell.nix/issues?q=is%3Aissue+DocTests

• Build system: x86_64-linux
• GHC version: 9.2.5
• Haskell.nix version (or commit) used: 146a785

Steps To Reproduce

This is a haskell.nix Flake to build hackage-server: https://github.com/haskell/hackage-server/pull/1154/files#diff-206b9ce276ab5971a2489d75eb1b12999d4bf3843b7988cbe8d687cfde61dea0

DocTests specified here:
https://github.com/haskell/hackage-server/blob/2e9cfb706e4f1fed0d9359b03e3487d1e8a0bcd1/hackage-server.cabal#L643-L651

PR: haskell/hackage-server#1154

To reproduce the issue, please

• check out git@github.com:peterbecich/hackage-server.git
  branch nix-flake

• nix flake check

  • This may take a long time. I have tried to minimize the build a little to isolate this issue but have been unsuccessful.

Expected behavior

nix flake check succeeds

Additional context

hackage-server currently has a shell.nix: https://github.com/haskell/hackage-server/blob/master/shell.nix
cabal test DocTests succeeds in that shell.

Thank you

[peterbecich]

I'm looking at doctest-parallel: https://hackage.haskell.org/package/doctest-parallel-0.2.6

Is it typical for Hackage packages to include ghc in Dependencies?

Dependencies	base (>=4.10 && <5), base-compat (>=0.7.0), Cabal (>=2.4 && <3.9), code-page (>=0.1), containers, deepseq, directory, doctest-parallel, exceptions, extra, filepath, ghc (>=8.2 && <9.5), ghc-paths (>=0.1.0.9), Glob, pretty, process, random (>=1.2), syb (>=0.3), template-haskell, transformers, unordered-containers [details]

---

trying to replace it with ghc-lib

[peterbecich]

ghc-lib produces a different error; not sure if forward progress or not

[peterbecich]

#313
Cannot build packages depending on ghc #313

I believe I have already tried reinstallableLibGhc

[andreasabel]

Should be tried again after the process >= 0.16.4 constraint has been dropped from Cabal-3.8.1.0 via revision of 2023-02-26.

[peterbecich]

Thanks, I have updated the hackage Flake input https://github.com/input-output-hk/hackage.nix and tested nix flake check again. It fails with the same error.

I see the revision you have made https://hackage.haskell.org/package/Cabal-3.8.1.0/revisions/ is in hackage.nix: https://github.com/input-output-hk/hackage.nix/blob/5be5cffeabea8f2fddcfcfcc3e8efce9c78ebbcf/hackage/Cabal-3.8.1.0-r2-77121d8e1aff14a0fd95684b751599db78a7dd26d55862d9fcef27c88b193e9d.nix#L10-L24

I wonder if haskell.nix nix flake check uses Cabal from NixPkgs, or hackage.nix. I wonder when this will be updated:
https://search.nixos.org/packages?channel=unstable&show=cabal-install&from=0&size=50&sort=relevance&type=packages&query=cabal-install

[peterbecich]

@andreasabel , I have reproduced the error in a new project: https://github.com/peterbecich/doctest-parallel-issue/blob/bf25c95fdfc6ebc4807c185c41cc3afc369ee4ef/hello.cabal#L49-L77

This is a template haskell.nix project; the sources are out-of-date and do not include https://hackage.haskell.org/package/Cabal-3.8.1.0/revisions/

---

After updating Cabal, the error is still there:

error: builder for '/nix/store/3lx3p3xn9fzwnja9sgs9v31qamj622gy-hello-test-DocTests-1.0.0.2-check.drv' failed with exit code 1;
       last 7 log lines:
       > unpacking sources
       > unpacking source archive /nix/store/hnbv3r226wxp7xcwkp23925cph1prv2h-source-root-test-DocTests
       > source root is source-root-test-DocTests
       > patching sources
       > building
       > DocTests: <command line>: cannot satisfy -package ghc
       >     (use -v for more information)
       For full logs, run 'nix log /nix/store/3lx3p3xn9fzwnja9sgs9v31qamj622gy-hello-test-DocTests-1.0.0.2-check.drv'.

I am using the latest hackage.nix, which includes your revision to Cabal, and a branch of nixpkgs which also includes the revision: https://github.com/peterbecich/doctest-parallel-issue/blob/4f1d7bb8478eb90fea72b869b4c3f0d89e179c9b/flake.nix#L3-L16
I would assume that haskell.nix is using the revised Cabal package to build the DocTests, but I can't know this for certain.

[andreasabel]

Ok, thanks for letting me know. (Unfortunately, I am not familiar with nix and cannot help with nix issues.)