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#!/bin/sh
. /lib/functions.sh
. /lib/functions/system.sh
export IMAGE="$1"
COMMAND="$2"
export ARGV="$IMAGE"
export ARGC=1
export SAVE_CONFIG=1
export SAVE_PARTITIONS=1
export INTERACTIVE=0
export VERBOSE=1
export CONFFILES=/tmp/sysupgrade.conffiles
export CONF_TAR=/tmp/sysupgrade.tgz
RAMFS_COPY_BIN= # extra programs for temporary ramfs root
RAMFS_COPY_DATA= # extra data files
[ -f "$CONF_TAR" ] || export SAVE_CONFIG=0
[ -f /tmp/sysupgrade.always.overwrite.bootdisk.partmap ] && export SAVE_PARTITIONS=0
include /lib/upgrade
supivot() { # <new_root> <old_root>
/bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
/bin/mount -o noatime,move /proc $1/proc && \
pivot_root $1 $1$2 || {
/bin/umount -l $1 $1
return 1
}
/bin/mount -o noatime,move $2/sys /sys
/bin/mount -o noatime,move $2/dev /dev
/bin/mount -o noatime,move $2/tmp /tmp
/bin/mount -o noatime,move $2/overlay /overlay 2>&-
return 0
}
switch_to_ramfs() {
for binary in \
/bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \
pivot_root mount_root reboot sync kill sleep \
md5sum hexdump cat zcat bzcat dd tar \
ls basename find cp mv rm mkdir rmdir mknod touch chmod \
'[' printf wc grep awk sed cut \
mtd partx losetup mkfs.ext4 \
ubiupdatevol ubiattach ubiblock ubiformat \
ubidetach ubirsvol ubirmvol ubimkvol \
snapshot snapshot_tool \
$RAMFS_COPY_BIN
do
local file="$(which "$binary" 2>/dev/null)"
[ -n "$file" ] && install_bin "$file"
done
install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
[ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
supivot $RAM_ROOT /mnt || {
echo "Failed to switch over to ramfs. Please reboot."
exit 1
}
/bin/mount -o remount,ro /mnt
/bin/umount -l /mnt
grep /overlay /proc/mounts > /dev/null && {
/bin/mount -o noatime,remount,ro /overlay
/bin/umount -l /overlay
}
}
kill_remaining() { # [ <signal> [ <loop> ] ]
local loop_limit=10
local sig="${1:-TERM}"
local loop="${2:-0}"
local run=true
local stat
local proc_ppid=$(cut -d' ' -f4 /proc/$$/stat)
echo -n "Sending $sig to remaining processes ... "
while $run; do
run=false
for stat in /proc/[0-9]*/stat; do
[ -f "$stat" ] || continue
local pid name state ppid rest
read pid name state ppid rest < $stat
name="${name#(}"; name="${name%)}"
# Skip PID1, our parent, ourself and our children
[ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
local cmdline
read cmdline < /proc/$pid/cmdline
# Skip kernel threads
[ -n "$cmdline" ] || continue
echo -n "$name "
kill -$sig $pid 2>/dev/null
[ $loop -eq 1 ] && run=true
done
let loop_limit--
[ $loop_limit -eq 0 ] && {
echo
echo "Failed to kill all processes."
exit 1
}
done
echo
}
indicate_upgrade
killall -9 telnetd
killall -9 dropbear
killall -9 ash
kill_remaining TERM
sleep 3
kill_remaining KILL 1
sleep 1
if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
platform_pre_upgrade "$IMAGE"
fi
if [ -n "$(rootfs_type)" ]; then
echo "Switching to ramdisk..."
switch_to_ramfs
fi
# Exec new shell from ramfs
exec /bin/busybox ash -c "$COMMAND"
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