[PATCH] add drivemap support to 30_os-prober.in and use UUIDs

[Felix Zielcke <fzielcke@z-51.de>]

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Attached patch uses `prepare_grub_to_access_device' to set the root in
the generated entrys.
And it adds drivemap to the chainload ones, if root isn't (hd0).

The Debian grub-installer adds map only with Dos and Windows, should I
do the same or is it okay to do it for all?

-# update-grub helper script.
+# grub-mkconfig helper script.
Does this needs to be mentioned in ChangeLog?
-- 
Felix Zielcke

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2009-06-07  Felix Zielcke  <fzielcke@z-51.de>

	    * util/grub.d/30_os-prober.in: Source
	    ${libdir}/grub/grub-mkconfig_lib.  Use prepare_grub_to_access_device
	    to set the root device.

diff --git a/util/grub.d/30_os-prober.in b/util/grub.d/30_os-prober.in
index 7d4d17e..9a6dff4 100644
--- a/util/grub.d/30_os-prober.in
+++ b/util/grub.d/30_os-prober.in
@@ -1,7 +1,7 @@
 #! /bin/sh -e
 
-# update-grub helper script.
-# Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
+# grub-mkconfig helper script.
+# Copyright (C) 2006,2007,2008,2009  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
@@ -16,6 +16,12 @@
 # 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/grub-mkconfig_lib
+
 if [ -z "`which os-prober 2> /dev/null`" -o -z "`which linux-boot-prober 2> /dev/null`" ] ; then
   # missing os-prober and/or linux-boot-prober
   exit 0
@@ -45,7 +51,15 @@ for OS in ${OSPROBED} ; do
 
       cat << EOF
 menuentry "${LONGNAME} (on ${DEVICE})" {
-	set root=${CHAINROOT}
+EOF
+      prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"
+
+      if [ `echo ${CHAINROOT} | sed -e 's/,[0-9]*[a-z]*//g'` != "(hd0)" ] ; then
+	  cat << EOF
+	  drivemap -s (hd0) \$root
+EOF
+      fi
+      cat << EOF
 	chainloader +1
 }
 EOF
@@ -61,15 +75,15 @@ EOF
         LINITRD="`echo ${LINUX} | cut -d ':' -f 5`"
         LPARAMS="`echo ${LINUX} | cut -d ':' -f 6- | tr '^' ' '`"
 
-        LINUXROOT="`grub-probe --target=drive --device ${LBOOT} 2> /dev/null`"
-
         if [ -z "${LLABEL}" ] ; then
           LLABEL="${LONGNAME}"
         fi
 
         cat << EOF
 menuentry "${LLABEL} (on ${DEVICE})" {
-	set root=${LINUXROOT}
+EOF
+	prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"
+	cat <<  EOF
 	linux ${LKERNEL} ${LPARAMS}
 EOF
         if [ -n "${LINITRD}" ] ; then
@@ -88,7 +102,9 @@ EOF
       OSXDISK=disk"`echo ${OSXROOT} | awk -F , '{ print $1 ; }' | sed 's/(hd//;'`"s"`echo ${OSXROOT} | awk -F , '{ print $2 ; }' | sed 's/)//;'`"
         cat << EOF
 menuentry "${LONGNAME} (on ${DEVICE})" {
-	set root=${OSXROOT}
+EOF
+	prepare_grub_to_access_device ${DEVICE} | sed -e "s/^/\t/"
+	cat << EOF
         insmod vbe
         do_resume=0
         if [ /var/vm/sleepimage -nt10 / ]; then