Reproductive dev env using NixPkgs

setup_nix.sh

# Install nix
# https://nixos.org/download.html#nix-install-macos
sh <(curl -L https://nixos.org/nix/install)

# Enable nix command (flakes already enabled for nix >= 2.4.0)
mkdir -p ~/.config/nix
echo 'experimental-features = nix-command flakes' >> ~/.config/nix/nix.conf
cat ~/.config/nix/nix.conf

# Restart your machine
reboot

# https://nix.dev/tutorials/install-nix#macos
# Check if nix is installed correctly
nix-shell -p nix-info --run "nix-info -m"

# Check if the nix commands is working
NP_DEBUG=1 nix run nixpkgs#hello --show-trace

# Pin your global nixpkgs
nix registry pin nixpkgs
nix registry pin github:NixOS/nixpkgs/nixos-unstable
nix registry list | grep user # make sure they are pinned with hashes

# Install `direnv`
# https://determinate.systems/posts/nix-direnv
nix profile install nixpkgs#direnv nixpkgs#nix-direnv

# Add the following to your ~/.bashrc or ~/.zshrc
echo 'eval "$(direnv hook zsh)"' > ~/.zshrc

# Restart your shell

# Setup reproducible direnv

cd ~/src/your-repo

cat <<EOF > flake.nix
{
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        devShell = pkgs.mkShell {
          buildInputs = with pkgs; [
            just
          ];
        };
      }
    );
}
EOF

cat <<EOF > .envrc
dotenv_if_exists
use flake
EOF

# Allow `direnv` to run the `.envrc` file
direnv allow .