#! /bin/bash -e

# Run GRUB script in a Qemu instance
# 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.
transform="@program_transform_name@"

prefix=@prefix@
exec_prefix=@exec_prefix@
bindir=@bindir@
libdir=@libdir@
builddir=@builddir@
PACKAGE_NAME=@PACKAGE_NAME@
PACKAGE_TARNAME=@PACKAGE_TARNAME@
PACKAGE_VERSION=@PACKAGE_VERSION@
target_cpu=@target_cpu@

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

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: $0 [OPTION] [SOURCE]
Run GRUB script in a Qemu instance.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --boot=[fd|hd|cd]       boot method for Qemu instance
  --modules=MODULES       pre-load specified modules MODULES
  --qemu-opts=OPTIONS     extra options to pass to Qemu instance

$0 runs input GRUB script or SOURCE file in a Qemu instance and prints
its output.

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=//' -e 's/,/ /g'`
	modules="$modules $ms" ;;
    --qemu-opts=*)
        qs=`echo "$option" | sed -e 's/--qemu-opts=//'`
        qemuopts="$qemuopts $qs" ;;
    --boot=*)
        dev=`echo "$option" | sed -e 's/--boot=//'`
	if   [ "$dev" = "fd" ] ; then bootdev=a;
	elif [ "$dev" = "hd" ] ; then bootdev=c;
	elif [ "$dev" = "cd" ] ; then bootdev=d;
	else
	    echo "Unrecognized boot method \`$dev'" 1>&2
	    usage
	    exit 1
	fi ;;
    -*)
	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${source}" = x ] ; then
    tmpfile=`mktemp`
    while read; do
	echo "$REPLY" >> ${tmpfile}
    done
    source=${tmpfile}
fi

if [ "x${bootdev}" = x ] ; then
    bootdev=c # default is boot as disk image
fi

cfgfile=`mktemp`
cat <<EOF >${cfgfile}
grubshell=yes
insmod serial
serial
terminal_input serial
terminal_output serial
EOF

for mod in ${modules}
do
    echo "insmod ${mod}" >> ${cfgfile}
done

cat <<EOF >>${cfgfile}
source /boot/grub/testcase.cfg
halt
EOF

isofile=`mktemp`
grub-mkrescue --output=${isofile} --override-directory=${builddir} \
  /boot/grub/grub.cfg=${cfgfile} /boot/grub/testcase.cfg=${source} \
  >/dev/null 2>&1

hdafile=`mktemp`
cp ${isofile} ${hdafile}

fdafile=`mktemp`
cp ${isofile} ${fdafile}

outfile=`mktemp`
qemu-system-i386 ${qemuopts} -nographic -hda ${hdafile} -fda ${fdafile} -cdrom ${isofile} -boot ${bootdev} | tr -d "\r" >${outfile}

cat $outfile

rm -f ${tmpfile} ${outfile} ${cfgfile} ${isofile} ${hdafile} ${fdafile}
exit 0