Re: [PATCH] Use os-prober to detect other OSes during update-grub

[Fabian Greffrath]

I should not forget to say that this script *depends* on the patch I sent in for 
grub-probe in my previous mail.
#! /bin/sh -e

# update-grub helper script.
# Copyright (C) 2006,2007,2008  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/>.

if [ -x "`which os-prober 2>/dev/null`" ] ; then
  OSPROBED="`os-prober | tr ' ' '|' | paste -s -d ' '`"
fi

if [ -n "${OSPROBED}" ] ; then
  for OS in ${OSPROBED} ; do
    DEVICE="`echo ${OS} | cut -d ':' -f 1`"
    LONGNAME="`echo ${OS} | cut -d ':' -f 2 | tr '|' ' '`"
    LABEL="`echo ${OS} | cut -d ':' -f 3 | tr '|' ' '`"
    BOOT="`echo ${OS} | cut -d ':' -f 4`"

    if [ -z "${LONGNAME}" ] ; then
      LONGNAME="${LABEL}"
    fi

    echo "Found ${LONGNAME} on ${DEVICE}" >&2
    
    TESTDEVICE="`grub-probe --target=device $0`"
    if [ -n "`grub-probe --target=drive --device ${TESTDEVICE} 2>/dev/null`" ] 
; then
      case "${BOOT}" in
        chain)
          CHAINROOT="`grub-probe --target=drive --device ${DEVICE}`"

          cat << EOF
menuentry "${LONGNAME} (on ${DEVICE})" {
        set root=${CHAINROOT}
        chainloader +1
}
EOF
        ;;
        linux)
          if [ -x "`which linux-boot-prober 2>/dev/null`" ] ; then
            LINUXPROBED="`linux-boot-prober ${DEVICE} | tr ' ' '|' | paste -s 
-d ' '`"
          fi

          if [ -n "${LINUXPROBED}" ] ; then
            for LINUX in ${LINUXPROBED} ; do
              LROOT="`echo ${LINUX} | cut -d ':' -f 1`"
              LBOOT="`echo ${LINUX} | cut -d ':' -f 2`"
              LLABEL="`echo ${LINUX} | cut -d ':' -f 3 | tr '|' ' '`"
              LKERNEL="`echo ${LINUX} | cut -d ':' -f 4`"
              LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
              LPARAMS="`echo ${LINUX} | cut -d ':' -f 6- | tr '|' ' '`"

              LINUXROOT="`grub-probe --target=drive --device ${LBOOT}`"

              if [ -z "${LLABEL}" ] ; then
                LLABEL="${LONGNAME}"
              fi

              cat << EOF
menuentry "${LLABEL} (on ${DEVICE})" {
        set root=${LINUXROOT}
        linux ${LKERNEL} ${LPARAMS}
EOF
              if [ -n "${LINITRD}" ] ; then
                cat << EOF
        initrd ${LINITRD}
EOF
              fi
              cat << EOF
}
EOF
            done
          fi
        ;;
        hurd)
          # not yet...
        ;;
        *)
        ;;
      esac
    fi
  done
fi