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Diffstat (limited to 'packages/slugos-init/files/boot/kexec')
| -rw-r--r-- | packages/slugos-init/files/boot/kexec | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/packages/slugos-init/files/boot/kexec b/packages/slugos-init/files/boot/kexec new file mode 100644 index 0000000000..c5b428cd07 --- /dev/null +++ b/packages/slugos-init/files/boot/kexec @@ -0,0 +1,159 @@ +#!/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 +# +# Command-line options for the new kernel are in "$3". + +# Use the standard init path (see /etc/init.d/rcS) +export PATH=/sbin:/bin:/usr/sbin:/usr/bin + +# Wait at least a short while for the disks... +if [ ! "$sleep" -gt 0 ] ; then + sleep=1 +fi + +# Load the helper functions +. /etc/default/functions +. /etc/default/modulefunctions + +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 + fi + ;; + + nfs ) + if /boot/network ; then + echo "Loading kexec kernel using nfs \"$kpath\"..." + echo "mounting nfs partition..." + if mount -o ro,nolock -t nfs `dirname "$kpath"` /mnt ; then + need_umount=1 + t=`basename "$kpath"` + kexec_image="/mnt/$t" + fi + 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/$kpath" + fi + fi + ;; + + * ) + echo "Unrecognized method: \"$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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