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

   1 platform_check_image() {
   2         local diskdev partdev diff
   3         [ "$#" -gt 1 ] && return 1
   4
   5         case "$(get_magic_word "$1")" in
   6                 eb48|eb63) ;;
   7                 *)
   8                         echo "Invalid image type"
   9                         return 1
  10                 ;;
  11         esac
  12
  13         export_bootdevice && export_partdevice diskdev 0 || {
  14                 echo "Unable to determine upgrade device"
  15                 return 1
  16         }
  17
  18         get_partitions "/dev/$diskdev" bootdisk
  19
  20         #extract the boot sector from the image
  21         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
  22
  23         get_partitions /tmp/image.bs image
  24
  25         #compare tables
  26         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  27
  28         rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
  29
  30         if [ -n "$diff" ]; then
  31                 echo "Partition layout has changed. Full image will be written."
  32                 ask_bool 0 "Abort" && exit 1
  33                 return 0
  34         fi
  35 }
  36
  37 platform_copy_config() {
  38         local partdev
  39
  40         if export_partdevice partdev 1; then
  41                 mount -t ext4 -o rw,noatime "/dev/$partdev" /mnt
  42                 cp -af "$CONF_TAR" /mnt/
  43                 umount /mnt
  44         fi
  45 }
  46
  47 platform_do_upgrade() {
  48         local diskdev partdev diff
  49
  50         if export_bootdevice && export_partdevice diskdev 0; then
  51                 sync
  52                 if [ "$SAVE_PARTITIONS" = "1" ]; then
  53                         get_partitions "/dev/$diskdev" bootdisk
  54
  55                         #extract the boot sector from the image
  56                         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
  57
  58                         get_partitions /tmp/image.bs image
  59
  60                         #compare tables
  61                         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  62                         if [ -n "$diff" ]; then
  63                                 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  64                                 return 0
  65                         fi
  66
  67                         #iterate over each partition from the image and write it to the boot disk
  68                         while read part start size; do
  69                                 if export_partdevice partdev $part; then
  70                                         echo "Writing image to /dev/$partdev..."
  71                                         get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
  72                                 else
  73                                         echo "Unable to find partition $part device, skipped."
  74                                 fi
  75                         done < /tmp/partmap.image
  76
  77                         #copy partition uuid
  78                         echo "Writing new UUID to /dev/$diskdev..."
  79                         get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
  80                 else
  81                         get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  82                 fi
  83
  84                 sleep 1
  85         fi
  86 }