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#!/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
}
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