target/linux/brcm2708/base-files/lib/upgrade/platform.sh

   1 . /lib/functions.sh
   2
   3 REQUIRE_IMAGE_METADATA=1
   4
   5 # copied from x86's platform.sh
   6
   7 platform_check_image() {
   8         local diskdev partdev diff
   9
  10         [ "$#" -gt 1 ] && return 1
  11
  12         export_bootdevice && export_partdevice diskdev -2 || {
  13                 echo "Unable to determine upgrade device"
  14                 return 1
  15         }
  16
  17         get_partitions "/dev/$diskdev" bootdisk
  18
  19         #extract the boot sector from the image
  20         get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
  21
  22         get_partitions /tmp/image.bs image
  23
  24         #compare tables
  25         diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
  26
  27         rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
  28
  29         if [ -n "$diff" ]; then
  30                 echo "Partition layout has changed. Full image will be written."
  31                 ask_bool 0 "Abort" && exit 1
  32                 return 0
  33         fi
  34
  35         return 0;
  36 }
  37
  38 platform_do_upgrade() {
  39         local diskdev partdev diff
  40
  41         export_bootdevice && export_partdevice diskdev -2 || {
  42                 echo "Unable to determine upgrade device"
  43                 return 1
  44         }
  45
  46         sync
  47
  48         if [ "$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=2M 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         #iterate over each partition from the image and write it to the boot disk
  74         while read part start size; do
  75                 # root is /dev/sd[a|b]2 and not /dev/sd[a|b] this causes some problem
  76                 # one of which is this offset, I'm not sure what's the best fix, so
  77                 # here's a WA.
  78                 let part=$((part - 2))
  79                 if export_partdevice partdev $part; then
  80                         echo "Writing image to /dev/$partdev..."
  81                         get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
  82                 else
  83                         echo "Unable to find partition $part device, skipped."
  84         fi
  85         done < /tmp/partmap.image
  86
  87         #copy partition uuid
  88         echo "Writing new UUID to /dev/$diskdev..."
  89         get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
  90 }
  91
  92 platform_copy_config() {
  93         local partdev
  94
  95         # Same as above /dev/sd[a|b]2 is root, so /boot is -1
  96         if export_partdevice partdev -1; then
  97                 mkdir -p /boot
  98                 [ -f /boot/kernel.img ] || mount -t vfat -o rw,noatime "/dev/$partdev" /boot
  99                 cp -af "$CONF_TAR" /boot/
 100                 tar --directory / -xvf "$CONF_TAR" boot/config.txt
 101                 sync
 102                 unmount /boot
 103         fi
 104 }