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#!/sbin/sh
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#
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# Backup and restore addon /system files
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#
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export C=/tmp/backupdir
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export SYSDEV="$(readlink -nf "$2")"
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export SYSFS="$3"
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export V=18.1
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export ADDOND_VERSION=3
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# Partitions to mount for backup/restore in V3
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export all_V3_partitions="vendor product system_ext"
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# Scripts in /system/addon.d expect to find backuptool.functions in /tmp
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cp -f /tmp/install/bin/backuptool.functions /tmp
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get_script_version() {
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version=$(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 $S/addon.d/ ]; then
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mkdir -p /tmp/addon.d/
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cp -a $S/addon.d/* /tmp/addon.d/
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chmod 755 /tmp/addon.d/*.sh
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fi
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}
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# Restore /system/addon.d from /tmp/addon.d
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restore_addon_d() {
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if [ -d /tmp/addon.d/ ]; then
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mkdir -p $S/addon.d/
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cp -a /tmp/addon.d/* $S/addon.d/
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rm -rf /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 $S/build.prop ]; then
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echo "Backup/restore is not possible. Partition is probably empty"
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return 1
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fi
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if ! grep -q "^ro.lineage.version=$V.*" $S/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 /tmp/addon.d/ ]; then
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for script in $(find /tmp/addon.d/ -name '*.sh' |sort -n); do
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v=$(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 $stage
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fi
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done
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done
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fi
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}
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#####################
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### Mount helpers ###
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#####################
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determine_system_mount() {
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if grep -q -e"^$SYSDEV" /proc/mounts; then
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umount $(grep -e"^$SYSDEV" /proc/mounts | cut -d" " -f2)
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fi
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if [ -d /mnt/system ]; then
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SYSMOUNT="/mnt/system"
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elif [ -d /system_root ]; then
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SYSMOUNT="/system_root"
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else
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SYSMOUNT="/system"
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fi
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export S=$SYSMOUNT/system
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}
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mount_system() {
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mount -t $SYSFS $SYSDEV $SYSMOUNT -o rw,discard
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}
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unmount_system() {
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umount $SYSMOUNT
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}
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get_block_for_mount_point() {
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grep -v "^#" /etc/recovery.fstab | grep " $1 " | tail -n1 | tr -s ' ' | 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}/${fstab_entry}"
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else
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dev="${BLK_PATH}/${name}"
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fi
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else
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if [ -n "$fstab_entry" ]; then
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dev="$fstab_entry"
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else
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dev="${BLK_PATH}/${name}"
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fi
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fi
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if [ -b "$dev" ]; then
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echo "$dev"
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fi
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}
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determine_system_mount
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DYNAMIC_PARTITIONS=$(getprop ro.boot.dynamic_partitions)
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BLK_PATH=$(dirname "$SYSDEV")
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mount_extra() {
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for partition in $@; do
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mnt_point="/$partition"
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mountpoint "$mnt_point" >/dev/null 2>&1 && break
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blk_dev=$(find_block "$partition")
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if [ -e "$blk_dev" ]; then
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[ "$DYNAMIC_PARTITIONS" = "true" ] && blockdev --setrw "$blk_dev"
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mkdir -p "$mnt_point"
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mount -o rw "$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 $@; do
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umount -l "/$partition" 2>/dev/null
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done
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}
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case "$1" in
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backup)
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mount_system
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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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fi
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unmount_system
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;;
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restore)
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mount_system
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if check_prereq; then
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run_stages pre-restore restore post-restore
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umount_extra $all_V3_partitions
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restore_addon_d
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rm -rf $C
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sync
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fi
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unmount_system
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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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