# Helper library for update-grub
# Copyright (C) 2007 Free Software Foundation, Inc.
#
# This file 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St - Suite 330, Boston, MA 02110, USA.

transform="@program_transform_name@"

sbindir=@sbindir@

grub_probe=${sbindir}/`echo grub-probe | sed ${transform}`

convert_system_path_to_grub_path ()
{
  dir=$1
  # Abort if file doesn't exist
  test -e $dir
  dir=`readlink -f $dir`

  drive=`${grub_probe} -t drive $dir`
  if [ "x$drive" = "x" ] ; then
    return 1
  fi

  # Abort if file is in a filesystem we can't read
  ${grub_probe} -t fs $dir > /dev/null 2>&1

  num=`stat -c %d $dir`
  relative_path=""
  while : ; do
    parent=`echo $dir | sed -e "s,/[^/]*$,,g" -e "s,^$,/,g"`
    if [ "x`stat -c %d $parent`" = "x$num" ] ; then : ; else
      break
    fi
    if [ "x$dir" = "x/" ] ; then
      break
    fi
    relative_path=`echo $dir | sed -e "s,^.*/,/,g"`$relative_path
    dir=$parent
  done

  echo ${drive}${relative_path}
}