#!/bin/bash
#
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.

set -euo pipefail

abs_top_srcdir=@abs_top_srcdir@
abs_builddir=@abs_builddir@
# configure expands the directory variables below into references to
# prefix, exec_prefix and datarootdir, which shellcheck cannot see.
# shellcheck disable=SC2034
prefix=@prefix@
# shellcheck disable=SC2034
exec_prefix=@exec_prefix@
# shellcheck disable=SC2034
datarootdir=@datarootdir@
includedir=@includedir@
install_dir="${DESTDIR:-}@prefix@"
bindir="${DESTDIR:-}@bindir@"
libdir="${DESTDIR:-}@libdir@"
mandir="${DESTDIR:-}@mandir@"
sbindir="${DESTDIR:-}@sbindir@"

headers_to_install() {
  find "${abs_top_srcdir}/lib" -name "*.h" -or -name "*.h.in" \
    | sed -n \
      -e "s|\.h\.in$|\.h|" \
      -e "s|.*include/|${DESTDIR:-}${includedir}/|p" \
    | sort -u
}

status=0

for header in $(headers_to_install); do
  if [ ! -f "${header}" ]; then
    echo "Missing $header"
    status=1
  fi
done

named_binary_path="${sbindir}/named"
if [ ! -x "${named_binary_path}" ]; then
  echo "ERROR: ${named_binary_path} does not exist or is not executable"
  status=1
fi

named_man_page_path="${mandir}/man8/named.8"
if [ ! -f "${named_man_page_path}" ]; then
  echo "ERROR: ${named_man_page_path} does not exist"
  status=1
fi

# Every installed program must have a manual page installed with it.
shopt -s nullglob

for program in "${bindir}"/* "${sbindir}"/* "${libdir}"/bind/*.so; do
  name=$(basename "${program}" .so)
  man_pages=("${mandir}"/man*/"${name}".?)
  if [ ${#man_pages[@]} -eq 0 ]; then
    echo "ERROR: no manual page was installed for ${name}"
    status=1
  fi
done

if [ -n "${DESTDIR:-}" ]; then
  for expected_subdir in bin include lib sbin share; do
    echo "${install_dir}/${expected_subdir}" >>"${abs_builddir}/expected_dirs"
  done
  find "${install_dir}" -maxdepth 1 -mindepth 1 -type d | sort >"${abs_builddir}/existing_dirs"
  if ! diff -u "${abs_builddir}/expected_dirs" "${abs_builddir}/existing_dirs"; then
    echo "ERROR: Contents of DESTDIR do not match expectations"
    status=1
  fi
  rm -f "${abs_builddir}/expected_dirs" "${abs_builddir}/existing_dirs"
fi

exit "$status"