target/linux/bcm4908/base-files/lib/functions/bcm4908.sh

   1 # SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
   2
   3 FS_STATE_READY=2
   4
   5 # $(1): file to read from
   6 # $(2): offset in bytes
   7 get_hex_u32_le() {
   8         dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/4 "%02x"'
   9 }
  10
  11 # Setup /tmp/env.config to provide "metadata" UBI volume access
  12 #
  13 # It can be used with "fw_printenv -c /tmp/env.config"
  14 bcm4908_pkgtb_setup_env_config() {
  15         local size=$((0x$(get_hex_u32_le /dev/ubi0_1 4)))
  16
  17         dd if=/dev/ubi0_1 of=/tmp/env.head count=8 iflag=count_bytes
  18         dd if=/dev/ubi0_1 of=/tmp/env.body skip=8 iflag=skip_bytes
  19         printf "%s\t0x%x\t0x%x\t0x%x" "/tmp/env.body" 0x0 $size $size > /tmp/env.config
  20 }
  21
  22 bcm4908_committed_image_seq() {
  23         bcm4908_pkgtb_setup_env_config
  24
  25         commited="$(fw_printenv -n -c /tmp/env.config COMMITTED)"
  26         [ -n "$commited" ] && {
  27                 seq=$(fw_printenv -n -c /tmp/env.config SEQ | cut -d ',' -f $commited)
  28                 [ -n "$seq" ] && {
  29                         echo $seq
  30                         return
  31                 }
  32         }
  33
  34         echo "Failed to read COMMITED and SEQ from metadata1" >&2
  35 }
  36
  37 # Make sure "rootfs_data" UBI volume matches currently flashed image
  38 #
  39 # On mismatch "rootfs_data" will be wiped and assigned
  40 #
  41 # $1: UBI volume of "rootfs_data" (e.g. ubi0_123)
  42 bcm4908_verify_rootfs_data() {
  43         local ubivol="$1"
  44         local dir=/tmp/rootfs_data
  45         local seq="$(bcm4908_committed_image_seq)"
  46
  47         [ -z "$seq" ] && return
  48
  49         mkdir $dir
  50         if ! mount -t ubifs /dev/$ubivol $dir; then
  51                 echo "Failed to mount $ubivol UBI volume" >&2
  52                 rmdir $dir
  53                 return
  54         fi
  55
  56         # Wipe rootfs_data if it doesn't belong to us
  57         [ "$(readlink $dir/.openwrt-image-seq)" != "$seq" ] && {
  58                 echo "Removing \"rootfs_data\" content"
  59                 rm -rf $dir/..?* $dir/.[!.]* $dir/*
  60         }
  61
  62         # If rootfs_data is clean (or was just wiped) claim it
  63         [ -z "$(ls -A $dir)" ] && {
  64                 echo "Assigning \"rootfs_data\" to the current firmware"
  65                 # Claim this "rootfs_data"
  66                 ln -s $seq $dir/.openwrt-image-seq
  67                 # Mark it ready to avoid "mount_root" wiping it again
  68                 ln -s $FS_STATE_READY $dir/.fs_state
  69         }
  70
  71         umount $dir
  72         rmdir $dir
  73 }