Default to '0' if 'default' line not found at all in existing grub.conf

ChangeLog

@@ -2,6 +2,9 @@
 # Copyright 1999-2008 Gentoo Foundation; 2008 Chris Gianelloni, Andrew Gaffney
 # Distributed under the GPL v2
 
+  15 Dec 2008; Andrew Gaffney <agaffney@gentoo.org> gen_bootloader.sh:
+  Default to '0' if 'default' line not found at all in existing grub.conf
+
   15 Dec 2008; Andrew Gaffney <agaffney@gentoo.org> gen_bootloader.sh:
   Adding code that duplicates default grub.conf entry to replace old awk
   script. Based on code written by Mike Auty <ikelos@gentoo.org>

gen_bootloader.sh

@@ -103,6 +103,10 @@ set_bootloader_grub_duplicate_default() {
 
 	# Find default entry
 	default=$(sed -rn '/^[[:space:]]*default[[:space:]=]/s/^.*default[[:space:]=]+([[:alnum:]]+).*$/\1/p' "${GRUB_CONF}")
+    if [ -z "${default}" ]; then
+		print_warning 1 "No default entry found...assuming 0"
+		default=0
+	fi
 	if ! echo ${default} | grep -q '^[0-9]\+$'; then
 		print_error 1 "We don't support non-numeric (such as 'saved') default values...skipping update"
 		return 0