Using nix develop to debug builds

[nixinator]

this might help you

Debug a failed derivation with `breakpointHook` and `cntr`

These instructions describe how to get an interactive shell at the point in a derivation when the derivation fails. This works in a Linux single-user installation of Nix. Add the breakpointHook package to the nativeBuildInputs of a mkDerivation. nativeBuildInputs = [ breakpointHook ]; Install cntr nix-env -i cntr Run your Nix build command, and when it fails, the breakpointHook will output a message like this: build failed in installPhase with exit code 1 To attach install cntr and run t…

then again, it may not.