System dependent narHash in flake.lock

[lovesegfault]

Describe the bug

I've been noticing an odd behavior where if I update my flake.lock on my aarch64-darwin host, I get a different narHash than if I do it on an x86_64-linux one.

Steps To Reproduce

1. git clone https://github.com/lovesegfault/nix-config
2. cd nix-config
3. git checkout 5dad1c5138074c57fe32ba8979267be6c969858a
4. nix flake lock --recreate-lock-file
5. Depending on host:

• aarch64-darwin

  warning: updating lock file '/Users/bemeurer/src/nix-config/flake.lock':
  • Updated input 'nixpkgs':
      'github:NixOS/nixpkgs/c3d95a02e904e1ef9bb78c59d36eadc15e3428b7' (2022-06-26)
    → 'github:NixOS/nixpkgs/c3d95a02e904e1ef9bb78c59d36eadc15e3428b7' (2022-06-26)
  

• x86_64-linux
  [no change]

• aarch64-linux
  [no change]

Expected behavior

The narHash shouldn't change since it's already correct.

nix-env --version output

nix-env (Nix) 2.9.1

[tomberek]

My first guess would be something like case-sensitive filesystem or git operations on OSX vs linux.

[lovesegfault]

Ah, yes:

NixOS/nixpkgs#179272

#1885