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|
#!/bin/sh
#
# Loads the specified kernel and kexecs it.
# The access method and path from which to fetch the kernel
# is specified in "$1" and "$2":
#
# flash /boot/zImage-ixp4xxbe
# nfs spike:/home/slug/vmlinuz
# wget http://devserv/kernels/vmlinuzbe
# wget ftp://ftpserv/pub/zImage
# /dev/sda1 /kernels/zImage-test
# UUID /kernels/zImage-test
# tftp server:/pub/kernels/vmlinuz
#
# Command-line options for the new kernel are in "$3".
# In order to use this, you must exec this script from the /linuxrc file.
#
# This sample linuxrc script boots from external disk. The last line of
# this example (exec /boot/flash) is a fallback; it will not normally be
# executed unless /boot/kexec is missing or damaged.
#--------------------
# #!/bin/sh
# sleep=8 exec /boot/kexec /dev/sda1 /boot/zImage-ixp4xxbe \
# "console=ttyS0,115200n8 root=/dev/sda1 rootfstype=ext3 rw init=/linuxrc"
# exec /boot/flash
#--------------------
#
# This one boots from flash in the normal fashion, except the kernel is
# loaded using wget. This is common for kernel debugging.
#--------------------
# #!/bin/sh
# exec /boot/kexec wget http://myserver/boot/zImage-ixp4xxbe \
# "console=ttyS0,115200n8 root=/dev/mtdblock4 rootfstype=jffs2 rw \
# init=/boot/flash noirqdebug"
# exec /boot/flash
#--------------------
# Use the standard init path (see /etc/init.d/rcS)
export PATH=/sbin:/bin:/usr/sbin:/usr/bin
# Wait at least a short while for the disks...
if [ ! "$sleep" -gt 0 ] ; then
sleep=1
fi
# Load the helper functions
. /etc/default/functions
. /etc/default/modulefunctions
# Print a distinctive banner to make it easy to separate the in-flash
# kernel boot from the kexec'd kernel boot when looking at logs, etc.
echo '###########################################################'
echo '###################### KEXEC ######################'
leds boot system
if [ -n "$1" -a -n "$2" ] ; then
method="$1"
shift
kpath="$1"
shift
if [ -n "$1" ] ; then
kcmdline="$1"
shift
fi
kexec_image=
need_umount=0
do_kexec=0
mount -t proc proc /proc
case "$method" in
flash )
echo "Loading kexec kernel directly from \"$kpath\"..."
kexec_image="$kpath"
;;
wget )
if /boot/network ; then
echo "mounting tmpfs partition..."
if mount -t tmpfs tmpfs /mnt ; then
need_umount=1
echo "Loading kexec kernel using wget \"$kpath\"..."
wget -P /mnt "$kpath"
t=`basename "$kpath"`
kexec_image="/mnt/$t"
fi
umount /sys
fi
;;
nfs )
if /boot/network ; then
echo "Loading kexec kernel using nfs \"$kpath\"..."
echo "mounting nfs partition..."
loadnfsmods
if mount -o ro,nolock -t nfs `dirname "$kpath"` /mnt ; then
need_umount=1
t=`basename "$kpath"`
kexec_image="/mnt/$t"
fi
umount /sys
fi
;;
/dev/* )
echo "Loading kexec kernel using disk \"$kpath\"..."
loaddiskmods
sleep "$sleep"
echo "mounting partition \"$method\"..."
if mount -o ro "$method" /mnt ; then
need_umount=1
kexec_image="/mnt/$kpath"
fi
;;
UUID )
echo "Loading kexec kernel using disk UUID \"$kpath\"..."
loaddiskmods
sleep "$sleep"
if [ -n "$UUID" ] ; then
echo "mounting partition UUID \"$UUID\"..."
if mount -o ro -U "$UUID" /mnt ; then
need_umount=1
kexec_image="/mnt/$kpath"
fi
fi
;;
tftp )
if /boot/network ; then
echo "mounting tmpfs partition..."
if mount -t tmpfs tmpfs /mnt ; then
need_umount=1
t=`basename "$kpath"`
kexec_image="/mnt/$t"
echo "Loading kexec kernel using tftp \"$kpath\"..."
tftp -g -l "$kexec_image" -r "${kpath#*:}" "${kpath%%:*}"
fi
umount /sys
fi
;;
* )
echo "Unrecognized method: \"$method\""
;;
esac
if [ -n "$kexec_image" -a -f "$kexec_image" ] ; then
if kexec -l "$kexec_image" ; then
do_kexec=1
fi
else
echo "Unable to load \"$kexec_image\""
fi
if [ $do_kexec -eq 1 -a -n "$kcmdline" ] ; then
echo "Attempting to mount /sys (sysfs)..."
if mount -t sysfs sysfs /sys ; then
echo "Setting command line:"
echo " \"$kcmdline\""
echo "$kcmdline" > /sys/kernel/kexec_cmdline
echo "unmounting /sys..."
umount /sys
else
do_kexec=0
fi
fi
if [ $need_umount -eq 1 ] ; then
echo "unmounting /mnt..."
umount /mnt
fi
if [ $do_kexec -eq 1 ] ; then
echo "Remounting root as read-only..."
mount -o remount,ro /
echo "Invoking \"kexec -f -e\" ..."
kexec -f -e
echo "ERROR!"
# We should never return here! At this point, things are not
# too well. Remount the root as rw, and fallback.
echo "Remounting root as read-write..."
mount -o remount,rw /
fi
else
echo "Usage: $0 flash|nfs|wget|UUID|/dev/<partition> <path-or-URL> [cmdline]"
fi
# fallback - use the flash boot
echo "Falling back to flash boot..."
leds beep -f 1000 -r 2
exec /boot/flash
# fallback to the fallback
leds boot system panic
exec <>/dev/console >&0 2>&0
test -x /bin/sh && exec /bin/sh
exit 1
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