#! /bin/sh -e

# update-grub helper script.
# Copyright (C) 2008  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/>.

prefix=@prefix@
exec_prefix=@exec_prefix@
libdir=@libdir@
. ${libdir}/grub/update-grub_lib

case "`uname 2>/dev/null`" in
  CYGWIN*)  ;;
  *) exit 0 ;;
esac

# Try C: even if current system is on other partition.
case "$SYSTEMDRIVE" in
  [Cc]:)     dirlist="C:"              ;;
  [D-Zd-z]:) dirlist="C: $SYSTEMDRIVE" ;;
  *) exit 0 ;;
esac

get_os_name_from_boot_ini ()
{
  # Fail if no or more than one partition.
  test "`sed -n 's,^\(\(multi\|scsi\)[^=]*\)=.*$,\1,p' "$1" 2>/dev/null | \
    sort | uniq | wc -l`" = 1 || return 1

  # Search 'default=PARTITION'
  local part=`sed -n 's,^default=,,p' "$1" | sed 's,\\\\,/,g;s,[ \t\r]*$,,;1q'`
  test -n "$part" || return 1

  # Search 'PARTITION="NAME" ...'
  local name=`sed -n 's,\\\\,/,g;s,^'"$part"'="\([^"]*\)".*$,\1,p' "$1" | sed 1q`
  test -n "$name" || return 1

  echo "$name"
}


for dir in $dirlist ; do

  # Check for Vista bootmgr.
  if [ -f "$dir"/bootmgr -a -f "$dir"/boot/bcd ] ; then
    OS="Windows Vista bootmgr"

  # Check for NTLDR.
  elif [ -f "$dir"/ntldr -a -f "$dir"/ntdetect.com -a -f "$dir"/boot.ini ] ; then
    OS=`get_os_name_from_boot_ini "$dir"/boot.ini` || OS="Windows NT/2000/XP loader"

  else
    continue
  fi

  # Get boot /dev/ice.
  dev=`${grub_probe} -t device "$dir" 2>/dev/null` || continue

  echo "Found $OS on $dir ($dev)" >&2
  cat << EOF
menuentry "$OS" {
EOF

  prepare_grub_to_access_device "$dev" | sed 's,^,\t,'

  cat << EOF
	chainloader +1
}
EOF
done