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#!/bin/sh
ARCH=$(uname -m)
KERNEL="/mnt/boot/kernel"
KEXEC_ARGS="-l"
if [ $ARCH = "arm" ]; then
KEXEC_ARGS="$KEXEC_ARGS --atags"
fi
PART_A=2
PART_B=3
me=$0
usage() {
cat >&2 <<EOF
Syntax: $me [-k kernel]
-k give the path to the kernel eg. /boot/vmlinuz-4.7.4
(default: $KERNEL)
EOF
exit $1
}
while getopts "k:" ch; do
case $ch {
(k)
# if default does not fit, give the actual keren via -k otion eg "-k /boot/vmlinuz-4.7.4
KERNEL="$OPTARG"
;;
(*)
usage 1
;;
}
done
shift $((OPTIND - 1))
load_kernel(){
# get the Bootargs and replace the current Partition with
# the one in $1 e.g. replace /dev/mmcblk0p2 with /dev/mmcblk0p3
BOOT_ARGS="$(cat /proc/cmdline | sed s#$CURRENT_PART#$1#g)"
# echo "kexec $KEXEC_ARG --append=\"$BOOT_ARGS\" $KERNEL"
# set -x
# Load the new kernel, unmount the partition and exec the new kernel
kexec $KEXEC_ARGS --append=\""$BOOT_ARGS"\" $KERNEL
umount /mnt
kexec -e
}
# just to be sure
umount /mnt 2> /dev/null
# get the partiton of the current kernel
PART="/dev/$(readlink /dev/root)"
# extract the partition number
C_M_PART_NUM=$(readlink /dev/root | grep -o -e '[[:digit:]]*$')
# cut off the Partition Number
C_M_PART=$(readlink /dev/root | sed "s/$C_M_PART_NUM\$//")
CURRENT_PART="/dev/${C_M_PART}${C_M_PART_NUM}"
case $C_M_PART_NUM in
"$PART_A")
DEVICE="/dev/${C_M_PART}${PART_B}"
mount -r $DEVICE /mnt
load_kernel $DEVICE
;;
"$PART_B")
DEVICE="/dev/${C_M_PART}${PART_A}"
mount -r $DEVICE /mnt
load_kernel $DEVICE
;;
*)
echo "FAILURE"
;;
esac
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