Pigeon/vm.nix

{
  writeShellApplication,
  coreutils, firecracker, jq,
  pigeon-vmconfig
}:

writeShellApplication {
  name = "pigeon-vm";
  runtimeInputs = [ coreutils firecracker jq ];
  text = ''
    [ "$#" -ne 3 ] && exit 1

    CONFIG="$(mktemp)"
    trap 'rm -rf "$CONFIG"' EXIT

    jq --arg s "$1" --arg g "$2" --arg r "$3" '
      (.drives[] | select(.drive_id == "student").path_on_host) = $s |
      (.drives[] | select(.drive_id == "grader").path_on_host) = $g |
      (.drives[] | select(.drive_id == "results").path_on_host) = $r
    ' ${pigeon-vmconfig} >"$CONFIG"

    firecracker --no-api --config-file "$CONFIG"
  '';
}