target/linux/x86/base-files/lib/upgrade/platform.sh

   1 platform_export_bootpart() {
   2         local cmdline uuid disk
   3
   4         if read cmdline < /proc/cmdline; then
   5                 case "$cmdline" in
   6                         *block2mtd=*)
   7                                 disk="${cmdline##*block2mtd=}"
   8                                 disk="${disk%%,*}"
   9                         ;;
  10                         *root=*)
  11                                 disk="${cmdline##*root=}"
  12                                 disk="${disk%% *}"
  13                         ;;
  14                 esac
  15
  16                 case "$disk" in
  17                         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)
  18                                 uuid="${disk#PARTUUID=}"
  19                                 uuid="${uuid%-02}"
  20                                 for disk in /dev/[hsv]d[a-z] /dev/xvd[a-z]; do
  21                                         set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
  22                                         if [ "$4$3$2$1" = "$uuid" ]; then
  23                                                 export BOOTPART="${disk}1"
  24                                                 return 0
  25                                         fi
  26                                 done
  27                         ;;
  28                         /dev/*)
  29                                 export BOOTPART="${disk%[0-9]}1"
  30                                 return 0
  31                         ;;
  32                 esac
  33         fi
  34
  35         return 1
  36 }
  37
  38 platform_check_image() {
  39         [ "$#" -gt 1 ] && return 1
  40
  41         case "$(get_magic_word "$1")" in
  42                 eb48|eb63) return 0;;
  43                 *)
  44                         echo "Invalid image type"
  45                         return 1
  46                 ;;
  47         esac
  48 }
  49
  50 platform_copy_config() {
  51         if [ -b "$BOOTPART" ]; then
  52                 mount -t ext4 -o rw,noatime "$BOOTPART" /mnt
  53                 cp -af "$CONF_TAR" /mnt/
  54                 umount /mnt
  55         fi
  56 }
  57
  58 get_partitions() { # <device> <filename>
  59         local disk="$1"
  60         local filename="$2"
  61
  62         if [ -b "$disk" -o -f "$disk" ]; then
  63                 echo "Reading partition table from $filename..."
  64
  65                 local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")"
  66                 if [ "$magic" != 0xAA55 ]; then
  67                         echo "Invalid partition table on $disk"
  68                         exit
  69                 fi
  70
  71                 rm -f "/tmp/partmap.$filename"
  72
  73                 local part
  74                 for part in 1 2 3 4; do
  75                         set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
  76
  77                         local type="$(($1 % 256))"
  78                         local lba="$(($2))"
  79                         local num="$(($3))"
  80
  81                         [ $type -gt 0 ] || continue
  82
  83                         printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
  84                 done
  85         fi
  86 }
  87
  88 platform_do_upgrade() {
  89         platform_export_bootpart
  90         disk="${BOOTPART%[0-9]}"
  91
  92         if [ -b "$disk" ]; then
  93                 sync
  94                 if [ "$SAVE_PARTITIONS" = "1" ]; then
  95                         get_partitions "$disk" bootdisk
  96
  97
  98                         #get block size
  99                         if [ -f "/sys/block/${disk##*/}/queue/physical_block_size" ]; then
 100                                 ibs="$(cat "/sys/block/${disk##*/}/queue/physical_block_size")"
 101                         else
 102                                 ibs=512
 103                         fi
 104
 105                         #extract the boot sector from the image
 106                         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
 107
 108                         get_partitions /tmp/image.bs image
 109
 110                         #compare tables
 111                         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
 112                         if [ -n "$diff" ]; then
 113                                 echo "Partition layout is changed.  Full image will be written."
 114                                 ask_bool 0 "Abort" && exit
 115
 116                                 get_image "$@" | dd of="$disk" bs=4096 conv=fsync
 117                                 return 0
 118                         fi
 119
 120                         #iterate over each partition from the image and write it to the boot disk
 121                         while read part start size; do
 122                         echo "Writing image to $disk$part..."
 123                                 get_image "$@" | dd of="$disk$part" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
 124                         done < /tmp/partmap.image
 125
 126                         #copy partition uuid
 127                         echo "Writing new UUID to $disk$part..."
 128                         get_image "$@" | dd of="$disk" bs=1 skip=440 count=4 seek=440 conv=fsync
 129                 else
 130                         get_image "$@" | dd of="$disk" bs=4096 conv=fsync
 131                 fi
 132
 133                 sleep 1
 134         fi
 135 }