Add check for existing grub.conf entry for kernel

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:
+  Add check for existing grub.conf entry for kernel
+
   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
 

gen_bootloader.sh

@@ -79,6 +79,11 @@ set_bootloader_grub() {
 
 	else
 		# The grub.conf already exists, so let's try to duplicate the default entry
+		if set_bootloader_grub_check_for_existing_entry "${GRUB_CONF}"; then
+			print_warning 1 "An entry was already found for a kernel/initramfs with this name...skipping update"
+			return 0
+		fi
+
 		set_bootloader_grub_duplicate_default "${GRUB_CONF}"
 	fi
 
@@ -89,6 +94,16 @@ set_bootloader_grub_duplicate_default_replace_kernel_initrd() {
 	sed -r -e "/^[[:space:]]*initrd/s/init(rd|ramfs)-[[:alnum:][:punct:]]+/init\1-${KNAME}-${ARCH}-${KV}/"
 }
 
+set_bootloader_grub_check_for_existing_entry() {
+	local GRUB_CONF=$1
+	if grep -q "^[[:space:]]*kernel[[:space:]=]*.*/kernel-${KNAME}-${ARCH}-${KV}\>" "${GRUB_CONF}" &&
+		grep -q "^[[:space:]]*initrd[[:space:]=]*.*/initramfs-${KNAME}-${ARCH}-${KV}\>" "${GRUB_CONF}"
+	then
+		return 0
+	fi
+	return 1
+}
+
 set_bootloader_grub_duplicate_default() {
 	local GRUB_CONF=$1
 	local GRUB_CONF_TMP="${GRUB_CONF}.tmp"