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201 lines
5.2 KiB
201 lines
5.2 KiB
#!/system/bin/sh
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#
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# Backup and restore addon /system files
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#
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export S=/system
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export C=/postinstall/tmp/backupdir
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export V=18.1
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export ADDOND_VERSION=3
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# Partitions to mount for backup/restore in V3
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export all_V3_partitions="vendor product system_ext"
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# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
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mkdir -p /postinstall/tmp/
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mountpoint /postinstall/tmp >/dev/null 2>&1 || mount -t tmpfs tmpfs /postinstall/tmp
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cp -f /postinstall/system/bin/backuptool_ab.functions /postinstall/tmp/backuptool.functions
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get_script_version() {
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version=$(grep "^# ADDOND_VERSION=" $1 | cut -d= -f2)
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[ -z "$version" ] && version=1
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echo $version
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}
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# Preserve /system/addon.d in /tmp/addon.d
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preserve_addon_d() {
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if [ -d /system/addon.d/ ]; then
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mkdir -p /postinstall/tmp/addon.d/
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cp -a /system/addon.d/* /postinstall/tmp/addon.d/
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# Discard any version 1 script, as it is not compatible with a/b
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for f in /postinstall/tmp/addon.d/*sh; do
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if [ $(get_script_version $f) = 1 ]; then
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rm $f
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fi
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done
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chmod 755 /postinstall/tmp/addon.d/*.sh
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fi
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}
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# Restore /postinstall/system/addon.d from /postinstall/tmp/addon.d
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restore_addon_d() {
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if [ -d /postinstall/tmp/addon.d/ ]; then
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mkdir -p /postinstall/system/addon.d/
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cp -a /postinstall/tmp/addon.d/* /postinstall/system/addon.d/
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rm -rf /postinstall/tmp/addon.d/
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fi
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}
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# Proceed only if /system is the expected major and minor version
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check_prereq() {
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# If there is no build.prop file the partition is probably empty.
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if [ ! -r /system/build.prop ]; then
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echo "Backup/restore is not possible. Partition is probably empty"
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return 1
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fi
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if ! grep -q "^ro.lineage.version=$V.*" /system/build.prop; then
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echo "Backup/restore is not possible. Incompatible ROM version: $V"
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return 2
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fi
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return 0
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}
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# Execute /system/addon.d/*.sh scripts with each $@ parameter
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run_stages() {
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if [ -d /postinstall/tmp/addon.d/ ]; then
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for script in $(find /postinstall/tmp/addon.d/ -name '*.sh' |sort -n); do
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# we have no /sbin/sh in android, only recovery
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# use /system/bin/sh here instead
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sed -i '0,/#!\/sbin\/sh/{s|#!/sbin/sh|#!/system/bin/sh|}' $script
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# we can't count on /tmp existing on an A/B device, so utilize /postinstall/tmp as tmpfs
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sed -i 's|. /tmp/backuptool.functions|. /postinstall/tmp/backuptool.functions|g' $script
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v=$(get_script_version $script)
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if [ $v -ge 3 ]; then
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mount_extra $all_V3_partitions
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else
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umount_extra $all_V3_partitions
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fi
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for stage in $@; do
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if [ $v -ge 3 ]; then
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$script $stage
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else
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ADDOND_VERSION=2 $script $stage
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fi
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done
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done
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fi
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}
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#####################
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### Mount helpers ###
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#####################
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get_block_for_mount_point() {
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grep -v "^#" /vendor/etc/fstab.$(getprop ro.boot.hardware) | grep "[[:blank:]]$1[[:blank:]]" | tail -n1 | tr -s [:blank:] ' ' | cut -d' ' -f1
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}
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find_block() {
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local name="$1"
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local fstab_entry=$(get_block_for_mount_point "/$name")
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# P-SAR hacks
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[ -z "$fstab_entry" ] && [ "$name" = "system" ] && fstab_entry=$(get_block_for_mount_point "/")
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[ -z "$fstab_entry" ] && [ "$name" = "system" ] && fstab_entry=$(get_block_for_mount_point "/system_root")
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local dev
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if [ "$DYNAMIC_PARTITIONS" = "true" ]; then
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if [ -n "$fstab_entry" ]; then
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dev="${BLK_PATH}/${fstab_entry}${SLOT_SUFFIX}"
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else
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dev="${BLK_PATH}/${name}${SLOT_SUFFIX}"
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fi
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else
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if [ -n "$fstab_entry" ]; then
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dev="${fstab_entry}${SLOT_SUFFIX}"
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else
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dev="${BLK_PATH}/${name}${SLOT_SUFFIX}"
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fi
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fi
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if [ -b "$dev" ]; then
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echo "$dev"
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fi
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}
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DYNAMIC_PARTITIONS=$(getprop ro.boot.dynamic_partitions)
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if [ "$DYNAMIC_PARTITIONS" = "true" ]; then
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BLK_PATH="/dev/block/mapper"
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else
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BLK_PATH=/dev/block/bootdevice/by-name
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fi
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CURRENTSLOT=$(getprop ro.boot.slot_suffix)
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if [ ! -z "$CURRENTSLOT" ]; then
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if [ "$CURRENTSLOT" = "_a" ]; then
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# Opposite slot
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SLOT_SUFFIX="_b"
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else
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SLOT_SUFFIX="_a"
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fi
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fi
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mount_extra() {
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for partition in $@; do
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mnt_point="/postinstall/$partition"
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mountpoint "$mnt_point" >/dev/null 2>&1 && continue
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[ -L "$mnt_point" ] && continue
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blk_dev=$(find_block "$partition")
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if [ -n "$blk_dev" ]; then
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[ "$DYNAMIC_PARTITIONS" = "true" ] && blockdev --setrw "$blk_dev"
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mount -o rw "$blk_dev" "$mnt_point"
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fi
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done
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}
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umount_extra() {
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for partition in $@; do
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# Careful with unmounting. If the update has a partition less than the current system,
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# /postinstall/$partition is a symlink to /system/$partition, which on the active slot
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# is a symlink to /$partition which is a mountpoint we would end up unmounting!
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[ ! -L "/postinstall/$partition" ] && umount -l "/postinstall/$partition" 2>/dev/null
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done
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}
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cleanup() {
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umount_extra $all_V3_partitions
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umount /postinstall/tmp
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rm -rf /postinstall/tmp
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}
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case "$1" in
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backup)
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if check_prereq; then
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mkdir -p $C
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preserve_addon_d
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run_stages pre-backup backup post-backup
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umount_extra $all_V3_partitions
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else
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cleanup
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fi
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;;
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restore)
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if check_prereq; then
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run_stages pre-restore restore post-restore
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restore_addon_d
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cleanup
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sync
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else
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cleanup
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fi
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;;
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*)
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echo "Usage: $0 {backup|restore}"
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exit 1
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esac
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exit 0
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