zsh: command not found: gomod2nix

[erikc96]

Quick question here, as I'm new to this tool and Nix.

I followed the instructions to set up the tool like this:

nix flake init -t github:tweag/gomod2nix#app
nix develop # (also tried nix shell)
nix build
go get github.com/mattn/go-sqlite3
gomod2nix

But even though I've opened the dev environment, it's not finding gomod2nix in my path.

Can anyone point me to a way of troubleshooting this?

Here's the output of nix flake metadata

Resolved URL:  git+file:///Users/erikc96/Projects/golang/nix
Locked URL:    git+file:///Users/erick96/Projects/golang/nix?ref=refs%2fheads%2fmain&rev=cb3bdd84986c85a2d0e52bd7e53efabafc57b967
Description:   A basic gomod2nix flake
Path:          /nix/store/q645qa21ynhxmfl949ymrpmbc9wzwi6l-source
Revision:      cb3bdd84986c85a2d0e52bd7e53efabafc57b967
Revisions:     1
Last modified: 2022-12-14 20:47:30
Inputs:
├───flake-utils: github:numtide/flake-utils/5aed5285a952e0b949eb3ba02c12fa4fcfef535f
├───gomod2nix: github:nix-community/gomod2nix/89cd0675b96775aa3ee86e7c0cf5bc238dd27976
│   ├───nixpkgs: github:NixOS/nixpkgs/5342fc6fb59d0595d26883c3cadff16ce58e44f3
│   └───utils: github:numtide/flake-utils/1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1
└───nixpkgs: github:NixOS/nixpkgs/1710ed1f6f8ceb75cf7d1cf55ee0cc21760e1c7a

Edit:

I have the same issue if I go the niv route.

[yangm97]

Turns out pkgs.gomod2nix is being shadowed by inputs.gomod2nix, even if you use with pkgs;. I believe this is the issue the template is running into.

To workaround you need to either change the input name or be explicit and use pkgs.gomod2nix to build your devShell.