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base-files: safer sysupgrade for kernel-in-UBI devices

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Ensure that the kernel CRC is invalidated while rootfs is being updated.
This allows the bootloader to detect an interrupted sysupgrade and fall
back to an alternate booting method, instead of just going ahead with
normal boot and effectively bricking the device.

Possible fallbacks include a recovery initramfs partition or UBI volume
and TFTP. See here for an example U-Boot configuration with fallbacks:
https://shorturl.at/befsA (https://github.com/Lanchon/openwrt-tr4400-v2/
blob/e7d707d6bd7839fbd0b8d0bd180fce451df77e47/install-recovery.sh#L52-L63)

Signed-off-by: Rodrigo Balerdi <lanchon@gmail.com>
This commit is contained in:
Rodrigo Balerdi 2022-04-15 00:59:49 -03:00 committed by Daniel Golle
parent 1e191adb20
commit 073dc450b5
1 changed files with 7 additions and 7 deletions
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14
package/base-files/files/lib/upgrade/nand.sh
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@ -288,7 +288,7 @@ nand_upgrade_tar() {
local board_dir=$(tar tf "$tar_file" | grep -m 1 '^sysupgrade-.*/$')
board_dir=${board_dir%/}
kernel_length=$( (tar xf "$tar_file" ${board_dir}/kernel -O | wc -c) 2> /dev/null)
local kernel_length=$( (tar xf "$tar_file" ${board_dir}/kernel -O | wc -c) 2> /dev/null)
local has_rootfs=0
local rootfs_length
local rootfs_type
@ -311,17 +311,17 @@ nand_upgrade_tar() {
nand_upgrade_prepare_ubi "$rootfs_length" "$rootfs_type" "${has_kernel:+$kernel_length}" "$has_env"
local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
[ "$has_kernel" = "1" ] && {
local kern_ubivol="$( nand_find_volume $ubidev $CI_KERNPART )"
tar xf "$tar_file" ${board_dir}/kernel -O | \
ubiupdatevol /dev/$kern_ubivol -s $kernel_length -
}
[ "$has_rootfs" = "1" ] && {
local root_ubivol="$( nand_find_volume $ubidev $CI_ROOTPART )"
tar xf "$tar_file" ${board_dir}/root -O | \
ubiupdatevol /dev/$root_ubivol -s $rootfs_length -
}
[ "$has_kernel" = "1" ] && {
local kern_ubivol="$( nand_find_volume $ubidev $CI_KERNPART )"
tar xf "$tar_file" ${board_dir}/kernel -O | \
ubiupdatevol /dev/$kern_ubivol -s $kernel_length -
}
nand_do_upgrade_success
}