1 files changed, 140 insertions, 0 deletions
diff --git a/app-admin/grub-scripts/files/grub-set-default b/app-admin/grub-scripts/files/grub-set-default
new file mode 100755
index 0000000..19162b2
--- /dev/null
+++ b/app-admin/grub-scripts/files/grub-set-default
@@ -0,0 +1,140 @@
+#!/sbin/runscript
+# Copyright 1999-2006 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: $
+
+#
+# This script looks for a grub-entry=N kernel option
+# (needs to be specified in /boot/grub/grub.conf by hand
+# and for each kernel entry with the correct number)
+# and calls grub-set-default with its value as argument.
+# Used to update /boot/grub/default with the current
+# running kernel entry for a convenient use of the grub
+# fallback mechanism.
+#
+# Suggestion:
+# Copy this script to /etc/init.d/grub-set-default,
+# add it to the boot runlevel and use the following
+# kernel options in grub.conf:
+#
+#   grub-entry=N panic=5 panic_on_oops=1
+#
+# WARNING:
+# This script expects /boot to either reside on a separate volume
+# and be mounted (readonly is ok), or to be part of the rootfs.
+# It is however recommended to put /boot on a separate volume
+# and mount it automatically but readonly, so System.map can
+# be read but no files (kernel images etc.) can be damaged, removed
+# or tampered with in any other way by accident.
+#
+# Direct feedback to Wolfram Schlich <wschlich@gentoo.org>.
+#
+
+depend() {
+	need localmount
+}
+
+start() {
+
+	# check for /proc stuff
+	if [[ ! -e /proc/cmdline || ! -e /proc/mounts ]]; then
+		eerror "/proc does not appear to be mounted, cannot set grub default entry"
+		eend 1
+		return 1
+	fi
+
+	# grub.conf entry number to be set as default
+	declare -i grub_entry=-1
+
+	# is /boot on a separate volume and mounted read-only?
+	declare -i boot_ro=0
+
+	# split kernel command line into positional arguments
+	IFS=' '
+	set -- $(</proc/cmdline)
+	unset IFS
+
+	# loop through kernel command line
+	while [[ ${#@} -gt 0 && ${grub_entry} -eq -1 ]]; do
+		case "${1}" in
+			grub-entry=*)
+				grub_entry=${1##*=}
+				;;
+			*)
+				;;
+		esac
+		shift
+	done
+
+	# be done if no grub-entry= option was passed to the kernel
+	if [ ${grub_entry} -eq -1 ]; then
+		einfo "Skipping setting grub default entry"
+		return 0
+	fi
+
+	# split /proc/mounts into array by newline
+	IFS=$'\n'
+	mounts=(
+		$(</proc/mounts)
+	)
+	unset IFS
+
+	# loop through array of mounts
+	for mount in "${mounts[@]}"; do
+
+		# split mount line into fields
+		IFS=' '
+		set -- ${mount}
+		unset IFS
+		mount_point="${2}" # field #2
+		mount_opts="${4}" # field #4
+		#einfo "Mount point: ${mount_point}"
+		#einfo "Mount opts: ${mount_opts}"
+		case "${mount_point}" in
+			/boot)
+				#einfo "Mount point /boot is on a separate volume"
+				IFS=','
+				set -- ${mount_opts}
+				unset IFS
+				while [[ ${#@} -gt 0 ]]; do
+					case "${1}" in
+						ro)
+							boot_ro=1
+							;;
+						*)
+							;;
+					esac
+					shift
+				done
+				;;
+			*)
+				;;
+		esac
+	done
+
+	# remount /boot rw if needed
+	if [ ${boot_ro} -eq 1 ]; then
+		#einfo "Mount point /boot needs remounting -> rw"
+		if ! /bin/mount -o remount,rw /boot; then
+			eerror "Failed to remount /boot rw"
+			eend 1
+			return 1
+		fi
+	fi
+
+	# call grub-set-default
+	ebegin "Setting grub default entry to current entry ${grub_entry}"
+	/sbin/grub-set-default ${grub_entry}
+	eend ${?}
+
+	# remount /boot ro if needed
+	if [ ${boot_ro} -eq 1 ]; then
+		#einfo "Mount point /boot needs remounting -> ro"
+		if ! /bin/mount -o remount,ro /boot; then
+			eerror "Failed to remount /boot ro"
+			eend 1
+			return 1
+		fi
+	fi
+
+}