#! /bin/sh
set -efu

self=$(readlink -f "$0")
basename=${0##*/}
prefix=${self%/bin/*}
libdir=$prefix/lib

debug=false
force=false
origin_host=${HOSTNAME-cat /proc/sys/kernel/hostname}
origin_user=$LOGNAME
target_spec=


fail=true

error() {
  echo "$basename: error: $1" >&2
  fail=false
}

for arg; do
  case $arg in
    --debug)
      debug=true
      ;;
    --force)
      force=true
      ;;
    -*)
      error "bad argument: $arg"
      ;;
    *)
      if test -n "$target_spec"; then
        error "bad argument: $arg"
      else
        target_spec=$arg
      fi
      ;;
  esac
done

if test -z "$target_spec"; then
  error 'no target specified'
fi

if test "$fail" != true; then
  exit 11
fi


script=$(jq -e -r \
    --argjson use_force "$force" \
    --arg target_spec "$target_spec" \
    --arg origin_host "$origin_host" \
    --arg origin_user "$origin_user" \
    -f "$libdir/populate.jq")

if test -z "$script"; then
  error 'no script produced'
  exit 12
fi


if test "$debug" = true; then
  echo "$script"
else
  eval "$script"
fi