Example projects not working

[oscar-izval]

Hi! I'm trying to follow the guide to test the examples provided in the repo, but I'm facing some issues, here's what I've done so far:

1. Fresh clone of the repo
2. Run nix build from my-example-haskell-lib-easy/. I get this error:

$ nix build
error: hash mismatch in fixed-output derivation '/nix/store/d6dbmxf60l647hmlfypk409zk1pmg371-source.drv':
         specified: sha256-Hz/xaCoxe4cJBH3h/KIfjzsrEyD915YEVEK8HFR7nO4=
            got:    sha256-ULKUethJNV2/5bs5xMKcPtX3qX10pvyjd5+whVRwVmQ=
error: 1 dependencies of derivation '/nix/store/2il79k0lfzpvjvs97xnn6x0a05asnsls-all-cabal-hashes-component-hspec-2.9.7.drv' failed to build
error: 1 dependencies of derivation '/nix/store/r3bdjfg4yfd87hsjkhm8vhp6j71wl8qi-cabal2nix-hspec-2.9.7.drv' failed to build
(use '--show-trace' to show detailed location information)

3. Replace sha256 with the one suggested in the error in my-example-haskell-lib-easy/flake.nix#L96:
4. At this point, after another nix build I get the following (as I originally mentioned in Unordered-Containers error nothunks #25):

$ nix build
warning: Git tree '/Users/oizquierdo/sb/stacklock2nix' is dirty
error: anonymous function at /nix/store/r5r86ssz81zdhmasban29996a4fiilq6-cabal2nix-splitmix-0.1.0.4/default.nix:1:1 called with unexpected argument 'testu01'

       at /nix/store/9qkpbm10iypl7zclprk9r0pwncr0snjk-source/pkgs/development/haskell-modules/make-package-set.nix:97:40:

           96|       # this wraps the `drv` function to add a `overrideScope` function to the result.
           97|       drvScope = allArgs: ensureAttrs (drv allArgs) // {
             |                                        ^
           98|         overrideScope = f:
(use '--show-trace' to show detailed location information)

Other things I've tried or found:

• nix flake update
• Update all-cabal-hashes to latest rev
• Compare contents of these two files, which I expected to be the same.
  https://github.com/NixOS/nixpkgs/blob/a4b903646ce5f446877662a851ab1cc206b4d708/pkgs/development/haskell-modules/hackage-packages.nix#L274139-L274157

$ cat /nix/store/g18qmc2qzdicd2qns729gcpca2sp9v93-cabal2nix-splitmix-0.1.0.4/default.nix
{ mkDerivation, async, base, base-compat, base-compat-batteries
, bytestring, clock, containers, criterion, deepseq, HUnit, lib
, math-functions, process, random, test-framework
, test-framework-hunit, tf-random, vector
}:
mkDerivation {
  pname = "splitmix";
  version = "0.1.0.4";
  sha256 = "6d065402394e7a9117093dbb4530a21342c9b1e2ec509516c8a8d0ffed98ecaa";
  revision = "1";
  editedCabalFile = "1iqlg2d4mybqwzwp67c5a1yxzd47cbp4f7mrpa6d0ckypis2akl0";
  libraryHaskellDepends = [ base deepseq ];
  testHaskellDepends = [
    async base base-compat base-compat-batteries bytestring containers
    deepseq HUnit math-functions process random test-framework
    test-framework-hunit tf-random vector
  ];
  benchmarkHaskellDepends = [
    base clock containers criterion random tf-random
  ];
  description = "Fast Splittable PRNG";
  license = lib.licenses.bsd3;
}

[cdepillabout]

Thanks for the detailed debugging messages!

2. Run nix build from my-example-haskell-lib-easy/. I get this error:

   $ nix build
   error: hash mismatch in fixed-output derivation '/nix/store/d6dbmxf60l647hmlfypk409zk1pmg371-source.drv':
            specified: sha256-Hz/xaCoxe4cJBH3h/KIfjzsrEyD915YEVEK8HFR7nO4=
               got:    sha256-ULKUethJNV2/5bs5xMKcPtX3qX10pvyjd5+whVRwVmQ=
   error: 1 dependencies of derivation '/nix/store/2il79k0lfzpvjvs97xnn6x0a05asnsls-all-cabal-hashes-component-hspec-2.9.7.drv' failed to build
   error: 1 dependencies of derivation '/nix/store/r3bdjfg4yfd87hsjkhm8vhp6j71wl8qi-cabal2nix-hspec-2.9.7.drv' failed to build

I'm pretty surprised you're seeing this error. I test that my-example-haskell-lib-easy/ builds in CI, it is quite unexpected that you would be having trouble running nix build in that directory. As far as I remember, everything should be correctly pinned so that it "just works".

Is there anything other debugging steps you could think of?

[cdepillabout]

Oh, maybe you also changed the resolver: in stack.yaml to an older version?

My guess is that in older stackage resolvers, the splitmix package doesn't take a testu01 argument. Let me see if I can put together a PR to fix (what I think is) the problem you're seeing.

[oscar-izval]

Oh, maybe you also changed the resolver: in stack.yaml to an older version?

Negative, I'm running nix build from a fresh clone

Is there anything other debugging steps you could think of?

Just tried on another computer (macos x86_64) and same result. The other computer is an M1

$ nix build -L
source> trying https://github.com/commercialhaskell/all-cabal-hashes/archive/9ab160f48cb535719783bc43c0fbf33e6d52fa99.tar.gz
source>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
source>                                  Dload  Upload   Total   Spent    Left  Speed
source>   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
source> 100 63.0M    0 63.0M    0     0   634k      0 --:--:--  0:01:41 --:--:--  749k
source> unpacking source archive /private/tmp/nix-build-source.drv-0/9ab160f48cb535719783bc43c0fbf33e6d52fa99.tar.gz
error: hash mismatch in fixed-output derivation '/nix/store/kwr99xys5r3ykbsqa2zvh17mbdpcp9h9-source.drv':
         specified: sha256-Hz/xaCoxe4cJBH3h/KIfjzsrEyD915YEVEK8HFR7nO4=
            got:    sha256-ULKUethJNV2/5bs5xMKcPtX3qX10pvyjd5+whVRwVmQ=
error: 1 dependencies of derivation '/nix/store/63v7n8989gq7kpcw7rx1p37aghq3aprw-all-cabal-hashes-component-hspec-2.9.7.drv' failed to build
error:
       … while calling the 'derivationStrict' builtin

         at //builtin/derivation.nix:9:12: (source not available)

       … while evaluating derivation 'my-example-haskell-app-0.1.0.0'
         whose name attribute is located at /nix/store/9qkpbm10iypl7zclprk9r0pwncr0snjk-source/pkgs/stdenv/generic/make-derivation.nix:270:7

       … while evaluating attribute 'buildInputs' of derivation 'my-example-haskell-app-0.1.0.0'

         at /nix/store/9qkpbm10iypl7zclprk9r0pwncr0snjk-source/pkgs/stdenv/generic/make-derivation.nix:314:7:

          313|       depsHostHost                = lib.elemAt (lib.elemAt dependencies 1) 0;
          314|       buildInputs                 = lib.elemAt (lib.elemAt dependencies 1) 1;
             |       ^
          315|       depsTargetTarget            = lib.elemAt (lib.elemAt dependencies 2) 0;

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

       error: 1 dependencies of derivation '/nix/store/jz0iqyn6irbdm5pkbbamsm9vig852i7h-cabal2nix-hspec-2.9.7.drv' failed to build

[sestrella]

@cdepillabout I would like to jump in and provide some additional context. I faced the same issues @oscar-izval mentioned before, however, I manage to go a little further by making the following changes:

# my-example-haskell-lib-easy/flake.nix
- rev = "9ab160f48cb535719783bc43c0fbf33e6d52fa99";
- sha256 = "sha256-Hz/xaCoxe4cJBH3h/KIfjzsrEyD915YEVEK8HFR7nO4=";
+ rev = "4018a4b7b6c3d8c0db39b71e6900732399f7c96e";
+ sha256 = "sha256-adFkfnBgV0iTPFUlR9L6EuYFBiZwnTKd2LA8Xv+8PKE";

# nix/build-support/stacklock2nix/cabal2nixArgsForPkg.nix
- "splitmix" = ver: { testu01 = null; };

I think the reason why nix build complains about cabal2nix-splitmix-0.1.0.4/default.nix:1:1 called with unexpected argument 'testu01' on macOS is that this test-suite is only buildable for Linux:

test-suite splitmix-testu01
  if !os(linux)
    buildable: False

Source: https://github.com/haskellari/splitmix/blob/master/splitmix.cabal

Getting rid of the splitmix override for macOS could be a potential solution, however, I found another issue:

error: builder for '/nix/store/q03cfpf7iv8qpvqq3h8plhm94zcv30yp-unliftio-0.2.22.0.drv' failed with exit code 1;
       last 10 log lines:
       >
       >   To rerun use: --match "/UnliftIO.IO.File/writeBinaryFileDurable/default-permissions/"
       >
       > Randomized with seed 1113949765
       >
       > Finished in 7.2448 seconds
       > 118 examples, 2 failures
       > Test suite unliftio-spec: FAIL
       > Test suite logged to: dist/test/unliftio-0.2.22.0-unliftio-spec.log
       > 0 of 1 test suites (0 of 1 test cases) passed.
       For full logs, run 'nix log /nix/store/q03cfpf7iv8qpvqq3h8plhm94zcv30yp-unliftio-0.2.22.0.drv'.
error: 1 dependencies of derivation '/nix/store/qv2ljl8ygw8x5yvhxjh786p7j2bc85k1-conduit-1.3.4.3.drv' failed to build
error: 1 dependencies of derivation '/nix/store/gmm98w8ryssdzywyi1q1z6fhp486gy8r-warp-3.3.21.drv' failed to build
error: 1 dependencies of derivation '/nix/store/c56w38sbl23mn22kaj5283y0ia62gv07-my-example-haskell-lib-0.1.0.0.drv' failed to build
error: 1 dependencies of derivation '/nix/store/3y4vydf73ybx7p9vxfv2ns7ljaxy7jg8-my-example-haskell-app-0.1.0.0.drv' failed to build

I didn't have time to debug this deeper, however, at first glance it looks unrelated to this project

[sestrella]

Going back to the changes I posted before, I think a better solution for the splitmix override would look something like this:

"splitmix" = ver: 
  if pkgs.stdenv.isLinux then
    { testu01 = null; }
  else
    {};

[cdepillabout]

@sestrella

I found another issue:

error: builder for '/nix/store/q03cfpf7iv8qpvqq3h8plhm94zcv30yp-unliftio-0.2.22.0.drv' failed with exit code 1;
      last 10 log lines:
       >
       >   To rerun use: --match "/UnliftIO.IO.File/writeBinaryFileDurable/default-permissions/"
       >
       > Randomized with seed 1113949765
       >
       > Finished in 7.2448 seconds
       > 118 examples, 2 failures
       > Test suite unliftio-spec: FAIL
       > Test suite logged to: dist/test/unliftio-0.2.22.0-unliftio-spec.log
       > 0 of 1 test suites (0 of 1 test cases) passed.
       For full logs, run 'nix log /nix/store/q03cfpf7iv8qpvqq3h8plhm94zcv30yp-unliftio-0.2.22.0.drv'.

I didn't have time to debug this deeper, however, at first glance it looks unrelated to this project

Thanks for reporting this. This looks the same as:

https://github.com/NixOS/nixpkgs/blob/deaae54adcb431bcb333ca6485b025ed17fe877d/pkgs/development/haskell-modules/configuration-darwin.nix#L306-L317

I fixed this in #28 in 889f987. Could you test if this fixes the problem for you?

[cdepillabout]

@oscar-izval

In #28 (comment) you say

Same thing on this branch :(

$ nix build
error: hash mismatch in fixed-output derivation '/nix/store/2n8dc0z22c7fvmhhvab28hvdwaf7cb3h-source.drv':
         specified: sha256-MLF0Vv2RHai3n7b04JeUchQortm+ikuwSjAzAHWvZJs=
            got:    sha256-WMkGyt1IFBGQzw4vnCouiiAhPa8BXr7cFM30RZsgvLY=
error: 1 dependencies of derivation '/nix/store/gk8s5df4pwr0ckaidi141krrnl7c6xz6-all-cabal-hashes-component-hspec-2.9.7.drv' failed to build
error: 1 dependencies of derivation '/nix/store/qg8hsw58a81ayqmm583i83grqfs970pp-cabal2nix-hspec-2.9.7.drv' failed to build

I'm not sure what could be going on here. Could you do nix show-derivation on /nix/store/2n8dc0z22c7fvmhhvab28hvdwaf7cb3h-source.drv and show the output here? Maybe also do nix show-derivation on the two other .drv files in the output there.

@sestrella Do you have an idea what could be going on here? In #27 (comment) you say:

I faced the same issues @oscar-izval mentioned before, however, I manage to go a little further by making the following changes:

# my-example-haskell-lib-easy/flake.nix
- rev = "9ab160f48cb535719783bc43c0fbf33e6d52fa99";
- sha256 = "sha256-Hz/xaCoxe4cJBH3h/KIfjzsrEyD915YEVEK8HFR7nO4=";
+ rev = "4018a4b7b6c3d8c0db39b71e6900732399f7c96e";
+ sha256 = "sha256-adFkfnBgV0iTPFUlR9L6EuYFBiZwnTKd2LA8Xv+8PKE";

Is this the change that is necessary to work around the error from @oscar-izval? Do you have an idea why this was necessary?

In #28, as of commit 889f987, the lines of code you're referencing look like:

stacklock2nix/my-example-haskell-lib-easy/flake.nix

Lines 92 to 97 in 889f987

	all-cabal-hashes = final.fetchFromGitHub {
	owner = "commercialhaskell";
	repo = "all-cabal-hashes";
	rev = "f3f41d1f11f40be4a0eb6d9fcc3fe5ff62c0f840";
	sha256 = "sha256-MLF0Vv2RHai3n7b04JeUchQortm+ikuwSjAzAHWvZJs=";
	};

It sounds like this hash may be incorrect if you're on OSX?