# default.nix
with import <nixpkgs> {};

derivation {
  name = "dev";
  builder = "${bash}/bin/bash";
  args = [ ./builder.sh ];
  buildInputs = [ vim git docker kubectl ];
  system = builtins.currentSystem;
}

# builder.sh
set -e
unset PATH
for p in $buildInputs; do
	export PATH=$p/bin${PATH:+:}$PATH
done