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

   1 platform_check_image() {
   2         [ "$#" -gt 1 ] && return 1
   3
   4         case "$(get_magic_word "$1")" in
   5                 eb48|eb63) return 0;;
   6                 *)
   7                         echo "Invalid image type"
   8                         return 1
   9                 ;;
  10         esac
  11 }
  12
  13 platform_copy_config() {
  14         local partdev
  15
  16         if export_partdevice partdev 1; then
  17                 mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
  18                 cp -af "$CONF_TAR" /mnt/
  19                 umount /mnt
  20         fi
  21 }
  22
  23 platform_do_upgrade() {
  24         local diskdev partdev ibs diff
  25
  26         if export_bootdevice && export_partdevice diskdev 0; then
  27                 sync
  28                 if [ "$SAVE_PARTITIONS" = "1" ]; then
  29                         get_partitions "/dev/$diskdev" bootdisk
  30
  31                         #get block size
  32                         if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
  33                                 ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
  34                         else
  35                                 ibs=512
  36                         fi
  37
  38                         #extract the boot sector from the image
  39                         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
  40
  41                         get_partitions /tmp/image.bs image
  42
  43                         #compare tables
  44                         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  45                         if [ -n "$diff" ]; then
  46                                 echo "Partition layout is changed.  Full image will be written."
  47                                 ask_bool 0 "Abort" && exit
  48
  49                                 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  50                                 return 0
  51                         fi
  52
  53                         #iterate over each partition from the image and write it to the boot disk
  54                         while read part start size; do
  55                                 if export_partdevice partdev $part; then
  56                                         echo "Writing image to /dev/$partdev..."
  57                                         get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
  58                                 else
  59                                         echo "Unable to find partition $part device, skipped."
  60                                 fi
  61                         done < /tmp/partmap.image
  62
  63                         #copy partition uuid
  64                         echo "Writing new UUID to /dev/$diskdev..."
  65                         get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
  66                 else
  67                         get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  68                 fi
  69
  70                 sleep 1
  71         fi
  72 }