Go package builds but gives errors in nix-shell: failed to create symbolic link

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I’m trying to package GitHub - gravitl/netmaker: Netmaker makes networks with WireGuard. Netmaker automates fast, secure, and distributed virtual networks., which will be my first package. I’m nearly successful but have a bit of learning still to go.

I have a successful build doing nix-build. I see the result/bin/netclient package, and if I run it directly it works! However, if I type nix-shell to “activate” it, I get the following errors:

ln: failed to create symbolic link '/run/user/1000/tmp.AcxDXIfgUZ-netclient-0433347c629cfb3e99283dd31d21cebefc3e8251/src/github.com/cpuguy83/go-md2man/v2': Read-only file system
ln: failed to create symbolic link '/run/user/1000/tmp.AcxDXIfgUZ-netclient-0433347c629cfb3e99283dd31d21cebefc3e8251/src/github.com/russross/blackfriday/v2': Read-only file system
ln: failed to create symbolic link '/run/user/1000/tmp.AcxDXIfgUZ-netclient-0433347c629cfb3e99283dd31d21cebefc3e8251/src/golang.zx2c4.com/wireguard/wgctrl': Read-only file system

These are indeed 3 of the dependencies that I generated using vgo2nix.
In the nix-shell netclient is not available, presumably due to the errors.

Here is the project folder I’ve come up with so far:

default.nix

with import <nixpkgs> {};

callPackage ./netclient.nix {}

netclient.nix

{ buildGoPackage, fetchFromGitHub, lib }:

buildGoPackage rec {           
  name          = "netclient-${version}";       
  #version       = "v0.8.5" # github won't download properly for some reason
  version       = "0433347c629cfb3e99283dd31d21cebefc3e8251"; # v0.8.5
  goPackagePath = "github.com/gravitl/netmaker";  # Incomplete
  subPackages   = [ "netclient" ];
  src = fetchFromGitHub { 
    owner  = "gravitl";
    repo   = "netmaker";
    rev    = "${version}";
    #sha256 = lib.fakeSha256;
    sha256 = "sha256:05m1bd84mycw2kmxbn6rs5rblzv2gk8h67dcx7yxvivxh9y9agin";
  }; 
  goDeps = ./deps.nix;
  #buildFlags = "";
}

deps.nix

# file generated from go.mod using vgo2nix (https://github.com/nix-community/vgo2nix)
[
  {
    goPackagePath = "cloud.google.com/go";
    fetch = {                  
      type = "git";
      url = "https://github.com/googleapis/google-cloud-go";
      rev = "v0.34.0";
      sha256 = "1kclgclwar3r37zbvb9gg3qxbgzkb50zk3s9778zlh2773qikmai";
      moduleDir = "";
    };
  }
...

I’ve omitted the rest of the auto-generated deps.nix