#! /bin/sh
set -e

# Compares GRUB script output with BASH output.
# Copyright (C) 2009,2010  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

# Initialize some variables.
prefix="@prefix@"
exec_prefix="@exec_prefix@"
datarootdir="@datarootdir@"
builddir="@builddir@"
PACKAGE_NAME=@PACKAGE_NAME@
PACKAGE_TARNAME=@PACKAGE_TARNAME@
PACKAGE_VERSION=@PACKAGE_VERSION@

# Force build directory components
PATH="${builddir}:$PATH"
export PATH

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: $0 [OPTION] [SOURCE]
Compares GRUB script output with BASH shell output.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --modules=MODULES       pre-load specified modules MODULES
  --qemu-opts=OPTIONS     extra options to pass to Qemu instance

$0 compares GRUB script output with BASH shell output and prints their
differences.

Report bugs to <bug-grub@gnu.org>.
EOF
}

# Check the arguments.
for option in "$@"; do
    case "$option" in
    -h | --help)
	usage
	exit 0 ;;
    -v | --version)
	echo "$0 (GNU GRUB ${PACKAGE_VERSION})"
	exit 0 ;;
    --modules=*)
	ms=`echo "$option" | sed -e 's/--modules=//'`
	modules="$modules,$ms" ;;
    --qemu-opts=*)
        qs=`echo "$option" | sed -e 's/--qemu-opts=//'`
        qemuopts="$qemuopts $qs" ;;
    -*)
	echo "Unrecognized option \`$option'" 1>&2
	usage
	exit 1
	;;
    *)
	if [ "x${source}" != x ] ; then
	    echo "too many parameters at the end" 1>&2
	    usage
	    exit 1
	fi
	source="${option}" ;;
    esac
done

if [ "x${source}" = x ] ; then
  tmpfile=`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"` || exit 1
  while read REPLY; do
    echo $REPLY >> "${tmpfile}"
  done
  source="${tmpfile}"
fi

outfile1=`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"` || exit 1
"@builddir@/grub-shell" --qemu-opts="${qemuopts}" --modules=${modules} "${source}" >"${outfile1}"

outfile2=`mktemp "${TMPDIR:-/tmp}/tmp.XXXXXXXXXX"` || exit 1
bash "${source}" >"${outfile2}"

if ! diff -q "${outfile1}" "${outfile2}" >/dev/null
then
  echo "${source}: GRUB and BASH outputs did not match (see diff -u ${outfile1} ${outfile2})"
  status=1
else
    rm -f "${outfile1}" "${outfile2}"
fi

exit $status