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# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
FS_STATE_READY=2
# $(1): file to read from
# $(2): offset in bytes
get_hex_u32_le() {
dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/4 "%02x"'
}
# Setup /tmp/env.config to provide "metadata" UBI volume access
#
# It can be used with "fw_printenv -c /tmp/env.config"
bcm4908_pkgtb_setup_env_config() {
local size=$((0x$(get_hex_u32_le /dev/ubi0_1 4)))
dd if=/dev/ubi0_1 of=/tmp/env.head count=8 iflag=count_bytes
dd if=/dev/ubi0_1 of=/tmp/env.body skip=8 iflag=skip_bytes
printf "%s\t0x%x\t0x%x\t0x%x" "/tmp/env.body" 0x0 $size $size > /tmp/env.config
}
bcm4908_committed_image_seq() {
bcm4908_pkgtb_setup_env_config
commited="$(fw_printenv -n -c /tmp/env.config COMMITTED)"
[ -n "$commited" ] && {
seq=$(fw_printenv -n -c /tmp/env.config SEQ | cut -d ',' -f $commited)
[ -n "$seq" ] && {
echo $seq
return
}
}
echo "Failed to read COMMITED and SEQ from metadata1" >&2
}
# Make sure "rootfs_data" UBI volume matches currently flashed image
#
# On mismatch "rootfs_data" will be wiped and assigned
#
# $1: UBI volume of "rootfs_data" (e.g. ubi0_123)
bcm4908_verify_rootfs_data() {
local ubivol="$1"
local dir=/tmp/rootfs_data
local seq="$(bcm4908_committed_image_seq)"
[ -z "$seq" ] && return
mkdir $dir
if ! mount -t ubifs /dev/$ubivol $dir; then
echo "Failed to mount $ubivol UBI volume" >&2
rmdir $dir
return
fi
# Wipe rootfs_data if it doesn't belong to us
[ "$(readlink $dir/.openwrt-image-seq)" != "$seq" ] && {
echo "Removing \"rootfs_data\" content"
rm -rf $dir/..?* $dir/.[!.]* $dir/*
}
# If rootfs_data is clean (or was just wiped) claim it
[ -z "$(ls -A $dir)" ] && {
echo "Assigning \"rootfs_data\" to the current firmware"
# Claim this "rootfs_data"
ln -s $seq $dir/.openwrt-image-seq
# Mark it ready to avoid "mount_root" wiping it again
ln -s $FS_STATE_READY $dir/.fs_state
}
umount $dir
rmdir $dir
}
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