buildBazelPackage with bazel_8

engdoreis · January 16, 2026, 6:10pm

I’m trying to build a project that uses bazel 8, so I created a derivation with `buildBazelPackage. But it errors during evaluation:
``
error: function ‘anonymous lambda’ called with unexpected argument ‘enableNixHacks’
```
I believe that the problem is cause by the following line:

github.com/NixOS/nixpkgs

pkgs/build-support/build-bazel-package/default.nix

7c8cdf6de


      
              allowedRequisites = [ ];
          
              inherit (lib.fetchers.normalizeHash { hashTypes = [ "sha256" ]; } fetchAttrs)
                outputHash
                outputHashAlgo
                ;
            }
          );
          
          nativeBuildInputs = fBuildAttrs.nativeBuildInputs or [ ] ++ [
            (bazel.override { enableNixHacks = true; })
          ];
          
          preHook = fBuildAttrs.preHook or "" + ''
            export bazelOut="$NIX_BUILD_TOP/output"
            export bazelUserRoot="$NIX_BUILD_TOP/tmp"
            export HOME="$NIX_BUILD_TOP"
          '';
          
          preConfigure = ''
            mkdir -p "$bazelOut"

The reason seens to be that, differently from bazel_7, the bazel_8 package does not have that argument.

Is that a bug? If so is there a workaround?