Add GRUB support cleanup by Richard Morris (#59192) to show an error if we can't work out device nodes and tell the user to manually generate grub.conf.

git-svn-id: svn+ssh://svn.gentoo.org/var/svnroot/genkernel/trunk@201 67a159dc-881f-0410-a524-ba9dfbe2cb84

gen_bootloader.sh

@@ -23,7 +23,7 @@ set_grub_bootloader() {
 	[ "x$GRUB_BOOTFS" == 'x' ] && GRUB_BOOTFS=$GRUB_ROOTFS
 
 	# Translate block letters into grub numbers
-	local GRUB_ROOT_DISK=$(echo $GRUB_ROOTFS | sed -e 's/\/dev\/[hs]d\([[:alpha:]]\)[[:digit:]]\+/\1/')
+	local GRUB_ROOT_DISK=$(echo $GRUB_ROOTFS | sed -e 's/\/dev\/[hsm]d\([[:alpha:]]\)[[:digit:]]\+/\1/')
 	case $GRUB_ROOT_DISK in
 		a )
 			GRUB_ROOT_DISK='0' ;;
@@ -38,14 +38,20 @@ set_grub_bootloader() {
 	esac
 
 	# Translate partition numbers into grub numbers
-	local GRUB_ROOT_PARTITION=$(echo $GRUB_BOOTFS | sed -e 's/\/dev\/[hs]d[[:alpha:]]\([[:digit:]]\+\)/\1/')
-	local GRUB_ROOT_PARTITION=$(($GRUB_ROOT_PARTITION-1))
+	local GRUB_ROOT_PARTITION=$(echo $GRUB_BOOTFS | sed -e 's/\/dev\/[hsm]d[[:alpha:]]\([[:digit:]]\+\)/\1/')
 
 	# Create grub configuration directory and file if it doesn't exist.
 	[ ! -e `basename $GRUB_CONF` ] && mkdir -p `basename $GRUB_CONF`
 
 	if [ ! -e $GRUB_CONF ]
 	then
+		# Check that $GRUB_ROOT_PARTITION is a single character
+		local GRUB_ROOT_PARTITION_TEST=$(printf $GRUB_ROOT_PARTITION | wc -c)
+		if [ "${GRUB_ROOT_PARTITION_TEST}" -ne '1' ]
+			# GRUB_ROOT_PARTITION is not a number; we can't work this out so... error
+			print_error 1 'Error! /boot/grub/grub.conf does not exist and the correct settings can't be automatically detected.'
+			print_error 1 'Please manually create your /boot/grub/grub.conf file.'
+		else
 			# grub.conf doesn't exist - create it with standard defaults
 			touch $GRUB_CONF
 			echo 'default 0' >> $GRUB_CONF
@@ -64,6 +70,7 @@ set_grub_bootloader() {
 				echo -e "\tinitrd /initrd-$KV" >> $GRUB_CONF
 			fi
 			echo "" >> $GRUB_CONF
+		fi
 	else
 		# grub.conf already exists; so...
 		# ... Clone the first boot definition and change the version.