nix flake check fails

[purefn]

After following the directions in the docs, I tried running nix flake check on my Linux machine. It fails, saying a x86_64-darwin is required. When I try and run it on macOS, I get the opposite, x86_64-linux is required. I assumed this has to do with IFD and maybe materialization would help. But it did not, it failed with the same errors.

Are there any tricks to making this work?

[jbgi]

yeah, it is annoying. upstream issue: NixOS/nix#4265

one hacky "workaround" could be to wrap nix in the nix shell:

utils.lib.eachSystem (import ./supported-systems.nix) (system: {
  nixWapped = writeShellScriptBin "nix" ''
    # Temporary override `supported-systems.nix` original content to be able to use `nix flake show|check` on dev machines (workaround for https://github.com/NixOS/nix/issues/4265)'
    echo '[ "${system}" ]' > ./supported-systems.nix
    function atexit() {
        git restore --staged --worktree ./supported-systems.nix
    }
    trap atexit EXIT
    ${nixFlakes}/bin/nix "$@"
  '';
  devShell = ... {
     buildInputs = [nixWapped];
   };
})

[ParetoOptimalDev]

@jbgi Should that be prepended with checks = like:

checks = utils.lib.eachSystem (import ./supported-systems.nix) (system: {
  nixWapped = writeShellScriptBin "nix" ''
    # Temporary override `supported-systems.nix` original content to be able to use `nix flake show|check` on dev machines (workaround for https://github.com/NixOS/nix/issues/4265)'
    echo '[ "${system}" ]' > ./supported-systems.nix
    function atexit() {
        git restore --staged --worktree ./supported-systems.nix
    }
    trap atexit EXIT
    ${nixFlakes}/bin/nix "$@"
  '';
  devShell = ... {
     buildInputs = [nixWapped];
   };
})

I see the current code used in cardano-node is:

         checks = flattenTree (collectChecks' projectPackages) //
            # Linux only checks:
            (optionalAttrs hostPlatform.isLinux (
              prefixNamesWith "nixosTests/" (mapAttrs (_: v: v.${system} or v) nixosTests)
            ))
            # checks run on default system only;
            // (optionalAttrs (system == defaultSystem) {
            hlint = pkgs.callPackage pkgs.hlintCheck {
              inherit (project.args) src;
            };
          });

Is that a better workaround for some reason?

[ParetoOptimalDev]

Actually every workaround I'm trying gives me the same failure using nix (Nix) 2.11.0:

$ git clone https://github.com/input-output-hk/cardano-node.git && cd cardano-node/ && nix flake check
... snip ...
error: cannot build '/nix/store/azr2hsfb2876a5ihwm41dq17p3j6wzcd-cardano-node-plan-to-nix-pkgs.drv' during evaluation because the option 'allow-import-from-derivation' is disabled
(use '--show-trace' to show detailed location information)

Or even using nix (Nix) 2.12.0pre20220921_f704c27:

git clone https://github.com/input-output-hk/cardano-node.git && cd cardano-node/ && nix run github:NixOS/nix flake check
... snip ...
error: cannot build '/nix/store/azr2hsfb2876a5ihwm41dq17p3j6wzcd-cardano-node-plan-to-nix-pkgs.drv' during evaluation because the option 'allow-import-from-derivation' is disabled
(use '--show-trace' to show detailed location information)

[hamishmack]

Try:

nix run github:NixOS/nix flake check -- --allow-import-from-derivation

[ParetoOptimalDev]

This works, but I don't think it can fix my actual immediate problem of getting haskell.nix to work with eu.nixbuild.net.I accidentally created an XY problem here by trying to simplify my problem for potential askers :/

I'll create a new issue describing my full problem and giving more context.

[peterbecich]

I think the haskell.nix Flake in cicero-pipe has a solution to this issue: https://github.com/input-output-hk/cicero-pipe
The key may be the materialization: https://github.com/input-output-hk/cicero-pipe/tree/master/nix/materialized

I am trying to copy the solution from cicero-pipe: #1825

[peterbecich]

A solution for nix flake show was recently merged: NixOS/nix#6988

The same issue for nix flake check on Flakes using IFD is discussed here: NixOS/nix#4265

I have copied the show PR to attempt to fix nix flake check: NixOS/nix#7759

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.