mirror of
https://github.com/openwrt/openwrt.git
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3d12b47985
Flush kernel memory caches during sysupgrade in order to mitigate the impact from memory consumption spikes in low-RAM devices. This may help to prevent sysupgrade causing a reboot before the actual flashing starts. Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
308 lines
6.9 KiB
Bash
308 lines
6.9 KiB
Bash
#!/bin/sh
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RAM_ROOT=/tmp/root
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export BACKUP_FILE=sysupgrade.tgz # file extracted by preinit
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[ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
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libs() { ldd $* 2>/dev/null | sed -E 's/(.* => )?(.*) .*/\2/'; }
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install_file() { # <file> [ <file> ... ]
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local target dest dir
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for file in "$@"; do
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if [ -L "$file" ]; then
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target="$(readlink -f "$file")"
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dest="$RAM_ROOT/$file"
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[ ! -f "$dest" ] && {
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dir="$(dirname "$dest")"
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mkdir -p "$dir"
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ln -s "$target" "$dest"
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}
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file="$target"
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fi
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dest="$RAM_ROOT/$file"
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[ -f "$file" -a ! -f "$dest" ] && {
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dir="$(dirname "$dest")"
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mkdir -p "$dir"
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cp "$file" "$dest"
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}
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done
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}
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install_bin() {
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local src files
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src=$1
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files=$1
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[ -x "$src" ] && files="$src $(libs $src)"
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install_file $files
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}
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run_hooks() {
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local arg="$1"; shift
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for func in "$@"; do
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eval "$func $arg"
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done
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}
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ask_bool() {
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local default="$1"; shift;
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local answer="$default"
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[ "$INTERACTIVE" -eq 1 ] && {
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case "$default" in
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0) echo -n "$* (y/N): ";;
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*) echo -n "$* (Y/n): ";;
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esac
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read answer
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case "$answer" in
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y*) answer=1;;
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n*) answer=0;;
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*) answer="$default";;
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esac
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}
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[ "$answer" -gt 0 ]
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}
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_v() {
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[ -n "$VERBOSE" ] && [ "$VERBOSE" -ge 1 ] && echo "$*" >&2
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}
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_vn() {
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[ -n "$VERBOSE" ] && [ "$VERBOSE" -ge 1 ] && echo -n "$*" >&2
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}
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v() {
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_v "$(date) upgrade: $@"
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}
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vn() {
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_vn "$(date) upgrade: $@"
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}
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json_string() {
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local v="$1"
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v="${v//\\/\\\\}"
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v="${v//\"/\\\"}"
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echo "\"$v\""
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}
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rootfs_type() {
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/bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
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}
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get_image() { # <source> [ <command> ]
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local from="$1"
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local cmd="$2"
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if [ -z "$cmd" ]; then
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local magic="$(dd if="$from" bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
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case "$magic" in
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1f8b) cmd="zcat";;
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425a) cmd="bzcat";;
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*) cmd="cat";;
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esac
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fi
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$cmd <"$from"
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}
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get_image_dd() {
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local from="$1"; shift
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(
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exec 3>&2
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( exec 3>&2; get_image "$from" 2>&1 1>&3 | grep -v -F ' Broken pipe' ) 2>&1 1>&3 \
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| ( exec 3>&2; dd "$@" 2>&1 1>&3 | grep -v -E ' records (in|out)') 2>&1 1>&3
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exec 3>&-
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)
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}
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get_magic_word() {
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(get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
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}
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get_magic_long() {
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(get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
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}
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get_magic_gpt() {
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(get_image "$@" | dd bs=8 count=1 skip=64) 2>/dev/null
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}
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get_magic_vfat() {
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(get_image "$@" | dd bs=1 count=3 skip=54) 2>/dev/null
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}
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part_magic_efi() {
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local magic=$(get_magic_gpt "$@")
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[ "$magic" = "EFI PART" ]
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}
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part_magic_fat() {
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local magic=$(get_magic_vfat "$@")
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[ "$magic" = "FAT" ]
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}
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export_bootdevice() {
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local cmdline bootdisk rootpart uuid blockdev uevent line class
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local MAJOR MINOR DEVNAME DEVTYPE
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if read cmdline < /proc/cmdline; then
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case "$cmdline" in
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*root=*)
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rootpart="${cmdline##*root=}"
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rootpart="${rootpart%% *}"
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;;
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esac
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case "$bootdisk" in
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/dev/*)
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uevent="/sys/class/block/${bootdisk##*/}/uevent"
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;;
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esac
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case "$rootpart" in
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PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-[a-f0-9][a-f0-9])
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uuid="${rootpart#PARTUUID=}"
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uuid="${uuid%-[a-f0-9][a-f0-9]}"
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for blockdev in $(find /dev -type b); do
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set -- $(dd if=$blockdev bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
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if [ "$4$3$2$1" = "$uuid" ]; then
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uevent="/sys/class/block/${blockdev##*/}/uevent"
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break
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fi
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done
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;;
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PARTUUID=????????-????-????-????-??????????02)
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uuid="${rootpart#PARTUUID=}"
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uuid="${uuid%02}00"
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for disk in $(find /dev -type b); do
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set -- $(dd if=$disk bs=1 skip=568 count=16 2>/dev/null | hexdump -v -e '8/1 "%02x "" "2/1 "%02x""-"6/1 "%02x"')
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if [ "$4$3$2$1-$6$5-$8$7-$9" = "$uuid" ]; then
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uevent="/sys/class/block/${disk##*/}/uevent"
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break
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fi
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done
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;;
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/dev/*)
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uevent="/sys/class/block/${rootpart##*/}/../uevent"
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;;
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0x[a-f0-9][a-f0-9][a-f0-9] | 0x[a-f0-9][a-f0-9][a-f0-9][a-f0-9] | \
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[a-f0-9][a-f0-9][a-f0-9] | [a-f0-9][a-f0-9][a-f0-9][a-f0-9])
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rootpart=0x${rootpart#0x}
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for class in /sys/class/block/*; do
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while read line; do
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export -n "$line"
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done < "$class/uevent"
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if [ $((rootpart/256)) = $MAJOR -a $((rootpart%256)) = $MINOR ]; then
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uevent="$class/../uevent"
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fi
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done
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;;
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esac
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if [ -e "$uevent" ]; then
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while read line; do
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export -n "$line"
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done < "$uevent"
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export BOOTDEV_MAJOR=$MAJOR
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export BOOTDEV_MINOR=$MINOR
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return 0
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fi
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fi
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return 1
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}
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export_partdevice() {
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local var="$1" offset="$2"
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local uevent line MAJOR MINOR DEVNAME DEVTYPE
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for uevent in /sys/class/block/*/uevent; do
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while read line; do
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export -n "$line"
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done < "$uevent"
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if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
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export "$var=$DEVNAME"
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return 0
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fi
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done
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return 1
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}
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hex_le32_to_cpu() {
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[ "$(echo 01 | hexdump -v -n 2 -e '/2 "%x"')" = "3031" ] && {
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echo "${1:0:2}${1:8:2}${1:6:2}${1:4:2}${1:2:2}"
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return
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}
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echo "$@"
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}
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get_partitions() { # <device> <filename>
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local disk="$1"
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local filename="$2"
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if [ -b "$disk" -o -f "$disk" ]; then
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v "Reading partition table from $filename..."
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local magic=$(dd if="$disk" bs=2 count=1 skip=255 2>/dev/null)
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if [ "$magic" != $'\x55\xAA' ]; then
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v "Invalid partition table on $disk"
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exit
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fi
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rm -f "/tmp/partmap.$filename"
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local part
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part_magic_efi "$disk" && {
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#export_partdevice will fail when partition number is greater than 15, as
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#the partition major device number is not equal to the disk major device number
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for part in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
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set -- $(hexdump -v -n 48 -s "$((0x380 + $part * 0x80))" -e '4/4 "%08x"" "4/4 "%08x"" "4/4 "0x%08X "' "$disk")
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local type="$1"
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local lba="$(( $(hex_le32_to_cpu $4) * 0x100000000 + $(hex_le32_to_cpu $3) ))"
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local end="$(( $(hex_le32_to_cpu $6) * 0x100000000 + $(hex_le32_to_cpu $5) ))"
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local num="$(( $end - $lba ))"
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[ "$type" = "00000000000000000000000000000000" ] && continue
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printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
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done
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} || {
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for part in 1 2 3 4; do
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set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
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local type="$(( $(hex_le32_to_cpu $1) % 256))"
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local lba="$(( $(hex_le32_to_cpu $2) ))"
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local num="$(( $(hex_le32_to_cpu $3) ))"
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[ $type -gt 0 ] || continue
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printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
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done
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}
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fi
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}
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indicate_upgrade() {
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. /etc/diag.sh
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set_state upgrade
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}
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# Flash firmware to MTD partition
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#
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# $(1): path to image
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# $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
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default_do_upgrade() {
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sync
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echo 3 > /proc/sys/vm/drop_caches
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if [ -n "$UPGRADE_BACKUP" ]; then
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get_image "$1" "$2" | mtd $MTD_ARGS $MTD_CONFIG_ARGS -j "$UPGRADE_BACKUP" write - "${PART_NAME:-image}"
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else
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get_image "$1" "$2" | mtd $MTD_ARGS write - "${PART_NAME:-image}"
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fi
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[ $? -ne 0 ] && exit 1
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}
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