anchor.diff:          echo "         be better to only have one layer that contains a nix store."
           # This requires Nix 1.12 or higher
           export NIX_REMOTE=local?root=$PWD
  -        ${nixUnstable}/bin/nix-store --load-db < ${nixRegistration contents}/db.dump
  +        ${nix}/bin/nix-store --load-db < ${nixRegistration contents}/db.dump
   
           # We fill the store in order to run the 'verify' command that
           # generates hash and size of output paths.
  
positive.code:   lib,
    pkgs,
    pigz,
    nixUnstable,
    perl,
    runCommand,
    rsync,
  
negative.code:         storePaths=$(cat ${nixRegistration contents}/storePaths)
          echo "Copying everything to /nix/store (will take a while)..."
          cp -prd $storePaths nix/store/
          ${nix}/bin/nix-store --verify --check-contents
  
          mkdir -p nix/var/nix/gcroots/docker/
          for i in ${lib.concatStringsSep " " contents}; do
  