#!/usr/bin/env bash

# Copyright 2020 The Fuchsia Authors
#
# Use of this source code is governed by a MIT-style
# license that can be found in the LICENSE file or at
# https://opensource.org/licenses/MIT

set -e -o pipefail

readonly KERNEL_IMAGE_FILE="$(<"$1")"
readonly OUTPUT="$2"
readonly DEPFILE="$3"

trap 'rm -f "$DEPFILE"' ERR HUP INT TERM

write_output() {
  local template='// Generated by %s.  DO NOT EDIT!
#define KERNEL_IMAGE_FILE "%s"
'
  local new_contents="$(printf "$template" "$0" "$KERNEL_IMAGE_FILE" $version_string_addr $version_string_size)"
  if [ ! -r "$OUTPUT" ] || [ "$(<"$OUTPUT")" != "$new_contents" ]; then
    echo "$new_contents" > "$OUTPUT"
  fi
}

echo "$OUTPUT: $KERNEL_SYMBOL_FILE" > "$DEPFILE"

write_output