1 platform_export_partdevice() {
2 local var="$1" offset="$2"
3 local uevent MAJOR MINOR DEVNAME DEVTYPE
5 for uevent in /sys/class/block/*/uevent; do
7 if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
16 platform_export_bootdevice() {
17 local cmdline uuid disk uevent
18 local MAJOR MINOR DEVNAME DEVTYPE
20 if read cmdline < /proc/cmdline; then
23 disk="${cmdline##*block2mtd=}"
27 disk="${cmdline##*root=}"
33 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]-02)
34 uuid="${disk#PARTUUID=}"
36 for disk in $(find /dev -type b); do
37 set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
38 if [ "$4$3$2$1" = "$uuid" ]; then
39 uevent="/sys/class/block/${disk##*/}/uevent"
45 uevent="/sys/class/block/${disk##*/}/uevent"
49 if [ -e "$uevent" ]; then
52 export BOOTDEV_MAJOR=$MAJOR
53 export BOOTDEV_MINOR=$MINOR
62 platform_check_image() {
63 [ "$#" -gt 1 ] && return 1
65 case "$(get_magic_word "$1")" in
68 echo "Invalid image type"
74 platform_copy_config() {
77 if platform_export_partdevice partdev 1; then
78 mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
79 cp -af "$CONF_TAR" /mnt/
84 get_partitions() { # <device> <filename>
88 if [ -b "$disk" -o -f "$disk" ]; then
89 echo "Reading partition table from $filename..."
91 local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
92 if [ "$magic" != 0xAA55 ]; then
93 echo "Invalid partition table on $disk"
97 rm -f "/tmp/partmap.$filename"
100 for part in 1 2 3 4; do
101 set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
103 local type="$(($1 % 256))"
107 [ $type -gt 0 ] || continue
109 printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
114 platform_do_upgrade() {
115 local diskdev partdev ibs diff
117 if platform_export_bootdevice && platform_export_partdevice diskdev 0; then
119 if [ "$SAVE_PARTITIONS" = "1" ]; then
120 get_partitions "/dev/$diskdev" bootdisk
123 if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
124 ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
129 #extract the boot sector from the image
130 get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
132 get_partitions /tmp/image.bs image
135 diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
136 if [ -n "$diff" ]; then
137 echo "Partition layout is changed. Full image will be written."
138 ask_bool 0 "Abort" && exit
140 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
144 #iterate over each partition from the image and write it to the boot disk
145 while read part start size; do
146 if platform_export_partdevice partdev $part; then
147 echo "Writing image to /dev/$partdev..."
148 get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
150 echo "Unable to find partition $part device, skipped."
152 done < /tmp/partmap.image
155 echo "Writing new UUID to /dev/$diskdev..."
156 get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
158 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync