The following is a script that should be installed into `/etc/grub.d/os-prober'. It uses Debian's `os-prober' package (if installed) to detect other operating systems which are installed on the computer and add them to the boot menu. It's up to you to decide if this is too Debian-specific or if you'd like to have it included in the upstream distribution of GRUB.
This script is improved over the one from my previous posting and has some minor issues fixed. Please use this version instead. It is all my work. @Robert: Refering to your question from Mon, 4 Feb 2008: I do not believe it is possible to simplify the code with "echo something | read a b c d" because it has to be '-f 6-' in the last step. Kernel parameters may of course contain colons. I do not know if it is possible to implement this via "echo ... | read ...".
#! /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
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