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

   1 platform_check_image() {
   2         local diskdev partdev diff
   3
   4         export_bootdevice && export_partdevice diskdev 0 || {
   5                 echo "Unable to determine upgrade device"
   6                 return 1
   7         }
   8
   9         get_partitions "/dev/$diskdev" bootdisk
  10
  11         #extract the boot sector from the image
  12         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
  13
  14         get_partitions /tmp/image.bs image
  15
  16         #compare tables
  17         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  18
  19         rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
  20
  21         if [ -n "$diff" ]; then
  22                 echo "Partition layout has changed. Full image will be written."
  23                 ask_bool 0 "Abort" && exit 1
  24                 return 0
  25         fi
  26 }
  27
  28 platform_copy_config() {
  29         local partdev
  30
  31         if export_partdevice partdev 1; then
  32                 mount -t vfat -o rw,noatime "/dev/$partdev" /mnt
  33                 cp -af "$CONF_TAR" /mnt/
  34                 umount /mnt
  35         fi
  36 }
  37
  38 platform_do_upgrade() {
  39         local diskdev partdev diff
  40
  41         export_bootdevice && export_partdevice diskdev 0 || {
  42                 echo "Unable to determine upgrade device"
  43                 return 1
  44         }
  45
  46         sync
  47
  48         if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
  49                 get_partitions "/dev/$diskdev" bootdisk
  50
  51                 #extract the boot sector from the image
  52                 get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
  53
  54                 get_partitions /tmp/image.bs image
  55
  56                 #compare tables
  57                 diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  58         else
  59                 diff=1
  60         fi
  61
  62         if [ -n "$diff" ]; then
  63                 get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
  64
  65                 # Separate removal and addtion is necessary; otherwise, partition 1
  66                 # will be missing if it overlaps with the old partition 2
  67                 partx -d - "/dev/$diskdev"
  68                 partx -a - "/dev/$diskdev"
  69
  70                 return 0
  71         fi
  72
  73         #write uboot image
  74         get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
  75         #iterate over each partition from the image and write it to the boot disk
  76         while read part start size; do
  77                 if export_partdevice partdev $part; then
  78                         echo "Writing image to /dev/$partdev..."
  79                         get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
  80                 else
  81                         echo "Unable to find partition $part device, skipped."
  82                 fi
  83         done < /tmp/partmap.image
  84
  85         #copy partition uuid
  86         echo "Writing new UUID to /dev/$diskdev..."
  87         get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
  88 }