#! /bin/sh -e

# update-grub helper script.
# Copyright (C) 2006,2007  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/>.

if [ "x${GRUB_DISTRIBUTOR}" = "" ] ; then
  OS=GNU
else
  OS="${GRUB_DISTRIBUTOR} GNU/Hurd"
fi

at_least_one=false
all_of_them=true

# FIXME: add l4 here?
kernel=
for i in /boot/gnumach.gz /boot/gnumach ; do
  if test -e $i ; then
    basename=`basename $i`
    dirname=`dirname $i`
    grub_dirname=`echo ${dirname} | sed -e "s%^/boot%${GRUB_DRIVE_BOOT}%g"`
    echo "Found GNU Mach: $i" >&2
    kernel=${grub_dirname}/${basename}
    at_least_one=true
  fi
done

# FIXME: This works for ext2.  For other filesystems we might need special-casing
case "${GRUB_FS}" in
  *fs)	hurd_fs="${GRUB_FS}" ;;
  *)	hurd_fs="${GRUB_FS}fs" ;;
esac

for i in /hurd/${hurd_fs}.static /hurd/exec ; do
  if test -e "$i" ; then 
    echo "Found Hurd module: $i" >&2
    at_least_one=true
  else
    all_of_them=false
  fi
done

if ${at_least_one} ; then : ; else
  # no hurd here, aborting silently
  exit 0
fi

if ${all_of_them} && test -e /lib/ld.so.1 ; then : ; else
  echo "Some Hurd stuff found, but not enough to boot." >&2
  exit 1
fi

cat << EOF
menuentry "${OS}" {
	multiboot ${kernel} root=device:${GRUB_DEVICE}
	module /hurd/${hurd_fs}.static --readonly \\
			--multiboot-command-line='\${kernel-command-line}' \\
			--host-priv-port='\${host-port}' \\
			--device-master-port='\${device-port}' \\
			--exec-server-task='\${exec-task}' -T typed '\${root}' \\
			'\$(task-create)' '\$(task-resume)'
	module /lib/ld.so.1 /hurd/exec '\$(exec-task=task-create)'
}
EOF