174 lines
4.5 KiB
Bash
174 lines
4.5 KiB
Bash
#!/bin/sh
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case $1 in
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prereqs)
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exit 0
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;;
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esac
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set -e
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# set -x
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total_mem=$(free | awk '/^Mem:/{print $2}')
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tmpfs_size=$(( $total_mem / 20 * 17 ))
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free_mem_thres=$(( $total_mem / 20 * 18 ))
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tmp_mnt='/mnt/ramdisk-convfs'
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root_mnt='/mnt/root-convfs'
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root_dev=''
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flash_dev=''
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block_flash=''
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aboot_flag=''
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backup_file=''
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# Get the fullpath of flash device, e.g., /dev/sda
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get_flash_dev() {
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for dev in $(ls /sys/block); do
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local is_mmc=$(echo "$dev" | grep 'mmcblk.*boot.*' | cat)
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if [ -n "$is_mmc" ]; then
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continue
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fi
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local devid=$(realpath "/sys/block/$dev/device")
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local is_device=$(echo "$devid" | grep '^/sys/devices/' | cat)
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local is_flash=$(echo "$devid" | grep "$block_flash" | cat)
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if [ -n "$is_device" -a -n "$is_flash" ]; then
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flash_dev="/dev/$dev"
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return 0
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fi
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done
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return 1
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}
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# Wait for root_dev to be ready
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wait_for_root_dev() {
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local try_rounds=30
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while [ $try_rounds -gt 0 ]; do
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if [ -e "$root_dev" ]; then
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return 0
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fi
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sleep 1
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try_rounds=$(( $try_rounds - 1 ))
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done
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return 1
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}
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# Alway run cleanup before exit
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cleanup() {
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if grep -q "$root_mnt" /proc/mounts; then
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umount "$root_mnt"
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fi
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if grep -q "$tmp_mnt" /proc/mounts; then
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umount "$tmp_mnt"
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fi
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[ -e "$root_mnt" ] && rmdir "$root_mnt"
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[ -e "$tmp_mnt" ] && rmdir "$tmp_mnt"
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}
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trap cleanup EXIT
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notification() {
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cat << EOF
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A failure happend in modifying the root file system which stopped the upgrade. Manual interventions are needed to fix the issue. Note that:
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1) files in the old root file system may have been lost and the old partition table may have been corrupted;
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2) The files in the old root file system were copied to $tmp_mnt;
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3) The old partition table was dumped to the file $tmp_mnt/$backup_file by sfdisk;
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4) Quitting the current shell will lose all files mentioned above permanently.
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EOF
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}
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run_cmd() {
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if ! eval "$1"; then
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echo "$2"
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notification
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sh
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exit 1
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fi
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}
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# Extract kernel parameters
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set -- $(cat /proc/cmdline)
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for x in "$@"; do
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case "$x" in
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block_flash=*)
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block_flash="${x#block_flash=}"
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;;
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Aboot=*)
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aboot_flag="${x#Aboot=}"
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esac
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done
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root_dev="$ROOT"
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#Check aboot and root_dev is vfat
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[ -z "$aboot_flag" ] && exit 0
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if [ -z "$root_dev" ]; then
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echo "Error: root device name is not provided"
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exit 1
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fi
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if ! wait_for_root_dev; then
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echo "Error: timeout in waiting for $root_dev"
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exit 1
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fi
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blkid | grep "$root_dev.*vfat" -q || exit 0
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# Get flash dev name
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if [ -z "$block_flash" ]; then
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echo "Error: flash device info is not provided"
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exit 1
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fi
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if ! get_flash_dev; then
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echo "Error: flash device is not found"
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exit 1
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fi
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# Check memory size for tmpfs
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free_mem=$(free | awk '/^Mem:/{print $4}')
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if [ "$free_mem" -lt "$free_mem_thres" ]; then
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echo "Error: memory is not enough"
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exit 1
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fi
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# Backup partition table
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mkdir -p "$root_mnt"
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mount "$root_dev" "$root_mnt"
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backup_file=backup.$(date +%Y-%m-%d.%H-%M-%S)
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sfdisk -d "$flash_dev" > "$root_mnt/$backup_file"
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# Check total size of files in root
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total_file_size=$(du -s "$root_mnt" | awk '{print $1}')
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if [ "$total_file_size" -gt "$tmpfs_size" ]; then
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echo "Error: total file size is too large"
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exit 1
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fi
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# Create tmpfs, and copy files to tmpfs
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mkdir -p "$tmp_mnt"
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mount -t tmpfs -o size="${tmpfs_size}k" tmpfs "$tmp_mnt"
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cp -a "$root_mnt/." "$tmp_mnt/"
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umount "$root_mnt"
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#### Lines below will modify the root file system, so any failure will be trapped to shell for manual interventions.
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# Create a new partition table (content in flash_dev will be deleted)
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err_msg="Error: repartitioning $flash_dev failed"
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cmd="echo ';' | sfdisk $flash_dev"
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run_cmd "$cmd" "$err_msg"
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sleep 5
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err_msg="Error: timeout in waiting for $root_dev after repartition"
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cmd="wait_for_root_dev"
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run_cmd "$cmd" "$err_msg"
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err_msg="Error: formatting to ext4 failed"
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cmd="mke2fs -t ext4 -m2 -F -O '^huge_file' $root_dev"
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run_cmd "$cmd" "$err_msg"
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err_msg="Error: mounting $root_dev to $root_mnt failed"
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cmd="mount -t ext4 $root_dev $root_mnt"
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run_cmd "$cmd" "$err_msg"
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err_msg="Error: extract docker directory"
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cmd="[ -f $tmp_mnt/dockerfs.tar.gz ] && rm -rf $tmp_mnt/var && tar xzf $tmp_mnt/dockerfs.tar.gz -C $root_mnt && rm -f $tmp_mnt/dockerfs.tar.gz"
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run_cmd "$cmd" "$err_msg"
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err_msg="Error: copying files form $tmp_mnt to $root_mnt failed"
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cmd="cp -a $tmp_mnt/. $root_mnt/"
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run_cmd "$cmd" "$err_msg"
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