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

   1 REQUIRE_IMAGE_METADATA=1
   2
   3 get_magic_at() {
   4         local pos="$2"
   5         get_image "$1" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
   6 }
   7
   8 platform_check_image() {
   9         local diskdev partdev diff
  10
  11         [ "$#" -gt 1 ] && return 1
  12
  13         case "$(get_magic_at "$1" 510)" in
  14                 55aa) ;;
  15                 *)
  16                         echo "Failed to verify MBR boot signature."
  17                         return 1
  18                 ;;
  19         esac
  20
  21         export_bootdevice && export_partdevice diskdev 0 || {
  22                 echo "Unable to determine upgrade device"
  23                 return 1
  24         }
  25
  26         get_partitions "/dev/$diskdev" bootdisk
  27
  28         #extract the boot sector from the image
  29         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
  30
  31         get_partitions /tmp/image.bs image
  32
  33         #compare tables
  34         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  35
  36         rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
  37
  38         if [ -n "$diff" ]; then
  39                 echo "Partition layout has changed. Full image will be written."
  40                 ask_bool 0 "Abort" && exit 1
  41                 return 0
  42         fi
  43 }
  44
  45 platform_copy_config() {
  46         local partdev
  47
  48         if export_partdevice partdev 1; then
  49                 mount -o rw,noatime "/dev/$partdev" /mnt
  50                 cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
  51                 umount /mnt
  52         fi
  53 }
  54
  55 platform_do_upgrade() {
  56         local diskdev partdev diff
  57
  58         export_bootdevice && export_partdevice diskdev 0 || {
  59                 echo "Unable to determine upgrade device"
  60                 return 1
  61         }
  62
  63         sync
  64
  65         if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
  66                 get_partitions "/dev/$diskdev" bootdisk
  67
  68                 #extract the boot sector from the image
  69                 get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
  70
  71                 get_partitions /tmp/image.bs image
  72
  73                 #compare tables
  74                 diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  75         else
  76                 diff=1
  77         fi
  78
  79         if [ -n "$diff" ]; then
  80                 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  81
  82                 # Separate removal and addtion is necessary; otherwise, partition 1
  83                 # will be missing if it overlaps with the old partition 2
  84                 partx -d - "/dev/$diskdev"
  85                 partx -a - "/dev/$diskdev"
  86
  87                 return 0
  88         fi
  89
  90         #write uboot image
  91         get_image "$@" | dd of="$diskdev" bs=512 skip=1 seek=1 count=4097 conv=fsync,notrunc
  92         #iterate over each partition from the image and write it to the boot disk
  93         while read part start size; do
  94                 if export_partdevice partdev $part; then
  95                         echo "Writing image to /dev/$partdev..."
  96                         get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
  97                 else
  98                         echo "Unable to find partition $part device, skipped."
  99                 fi
 100         done < /tmp/partmap.image
 101
 102         #copy partition uuid
 103         echo "Writing new UUID to /dev/$diskdev..."
 104         get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
 105 }