# nix-shell -p lxc debootstrap distrobuilder

function setup(){
  cp /etc/resolv.conf /etc/resolv.conf.bak
}

function cleanup(){
  cp /etc/resolv.conf.bak /etc/resolv.conf

  # reset permissions of output folder to the owner
  local owner=$(ls -ld $PWD | awk '{print $3}')
  local group=$(ls -ld $PWD | awk '{print $4}')

  chown -R "$owner:$group" ./images
}


function build () {
  local config="$1"
  local location="$2"

  # file:// cannot have relative paths, so use a bit of subsitution to fix
  if grep -q SKYNET_ROOT_DIR "$config"; then

    # create a copy with the file
    cp "$config" "$config.tmp"
    # sed normally uses / but that conflcts with file paths so use @ instead
    sed -i "s@SKYNET_ROOT_DIR@$PWD@g" "$config.tmp"

    # normal command
    distrobuilder build-lxc "$config.tmp" $location

    # cleanup
    rm "$config.tmp"
  else
    distrobuilder build-lxc $config $location
  fi
}

function main(){
  setup

  build base.yaml ./images/base
  build base_trainee.yaml ./images/base_trainee

  cleanup
}


main