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base-files: emmc: invalidate kernel image while rootfs is being written

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Some setups have alternate boot actions in case the main OS fails to
boot. These can include a secondary copy of the OS, a recovery OS, a
fallback to TFTP boot, etc.

This commit invalidates the kernel image while rootfs is being written
which, if a sysupgrade is interrupted, will trigger an alternate boot
action in devices that support it. This results in safer sysupgrades.

Signed-off-by: Rodrigo Balerdi <lanchon@gmail.com>
This commit is contained in:
Rodrigo Balerdi 2024-09-24 03:51:43 -03:00 committed by Daniel Golle
parent a4c95f1444
commit c4022e6199
1 changed files with 10 additions and 3 deletions
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13
package/base-files/files/lib/upgrade/emmc.sh
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@ -16,15 +16,22 @@ emmc_upgrade_tar() {
tar tf "$tar_file" ${board_dir}/kernel 1>/dev/null 2>/dev/null && has_kernel=1
tar tf "$tar_file" ${board_dir}/root 1>/dev/null 2>/dev/null && has_rootfs=1
[ "$has_kernel" = 1 -a "$EMMC_KERN_DEV" ] &&
export EMMC_KERNEL_BLOCKS=$(($(tar xf "$tar_file" ${board_dir}/kernel -O | dd of="$EMMC_KERN_DEV" bs=512 2>&1 | grep "records out" | cut -d' ' -f1)))
[ "$has_rootfs" = 1 -a "$EMMC_ROOT_DEV" ] && {
# Invalidate kernel image while rootfs is being written
[ "$has_kernel" = 1 -a "$EMMC_KERN_DEV" ] && {
dd if=/dev/zero of="$EMMC_KERN_DEV" bs=512 count=8
sync
}
export EMMC_ROOTFS_BLOCKS=$(($(tar xf "$tar_file" ${board_dir}/root -O | dd of="$EMMC_ROOT_DEV" bs=512 2>&1 | grep "records out" | cut -d' ' -f1)))
# Account for 64KiB ROOTDEV_OVERLAY_ALIGN in libfstools
EMMC_ROOTFS_BLOCKS=$(((EMMC_ROOTFS_BLOCKS + 127) & ~127))
sync
}
[ "$has_kernel" = 1 -a "$EMMC_KERN_DEV" ] &&
export EMMC_KERNEL_BLOCKS=$(($(tar xf "$tar_file" ${board_dir}/kernel -O | dd of="$EMMC_KERN_DEV" bs=512 2>&1 | grep "records out" | cut -d' ' -f1)))
if [ -z "$UPGRADE_BACKUP" ]; then
if [ "$EMMC_DATA_DEV" ]; then
dd if=/dev/zero of="$EMMC_DATA_DEV" bs=512 count=8