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