Add RO2RW usable with any Android phone
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commit
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#!/system/bin/sh
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#
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# RO2RW for any Android phone
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#
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# Makes /vendor, /system and /product read-write
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# And converts /system from f2fs to ext4 if it's f2fs
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#
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# (c) Vitaliy Filippov 2023
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#
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set -e
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resize_fs() {
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local path=$1
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local label=$2
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local partname=$3
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local percent=$4
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local convert_fs=$5
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local dm_block_ext4=$(df -t ext4 | grep "$path"'$' | cut -DF1)
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local dm_block_f2fs=$(df -t f2fs | grep "$path"'$' | cut -DF1)
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fs_size_mb=`du -sm $path | cut -f1`
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part_size_mb=`blockdev --getsize64 $dm_block_ext4 $dm_block_f2fs | awk '{print int($1 / 1048576)}'`
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super_free_mb=`lptools free | grep Free | awk '{print int($3 / 1048576)}'`
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new_fs_size_mb=`echo $fs_size_mb $super_free_mb $percent | awk '{print int($1 + $2 * $3 / 100)}'`
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if [[ "$new_fs_size_mb" -le "$part_size_mb" ]]; then
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# just in case if we resized the partition, but not the FS
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new_fs_size_mb=$part_size_mb
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fi
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new_fs_size=`echo $new_fs_size_mb | awk '{print $1 * 1048576}'`
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if [ "$dm_block_ext4" ]; then
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echo " - Unmounting $path..."
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umount $path
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echo " - Resizing partition $partname inside 'super' to $new_fs_size_mb MB using lptools"
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lptools resize $partname $new_fs_size
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lptools unmap $partname
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lptools map $partname
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echo " - Checking $path block partition before resizing..."
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e2fsck -f $dm_block_ext4
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echo " - Resizing the filesystem on $dm_block_ext4..."
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resize2fs $dm_block_ext4
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echo " - Make the $path partition R/W by unsharing its blocks..."
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e2fsck -E unshare_blocks $dm_block_ext4
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elif [ "$dm_block_f2fs" ]; then
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uuid=`toybox blkid $dm_block_f2fs | egrep '[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}' -o`
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echo " - Create R/W $partname image..."
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truncate -s ${new_fs_size_mb}M /data/new-rw.img
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if [ "$convert_fs" = "ext4" ]; then
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mke2fs -t ext4 -U $uuid -L $label /data/new-rw.img
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else
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make_f2fs -g android -O project_quota,extra_attr,inode_checksum,sb_checksum,compression,flexible_inline_xattr,verity,inode_crtime -U $uuid -f -l $label /data/new-rw.img
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fi
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mkdir -p /data/new-rw
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mount /data/new-rw.img /data/new-rw
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echo " - Copy old R/O $partname files to our new created image..."
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cp -a --preserve=all $path/* /data/new-rw
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# Android's toybox `cp` is buggy: `cp -a --preserve=all` does NOT preserve selinux contexts
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# on directories and symlinks and you get a bootloop. So we need to restore selinux contexts...
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cd $path
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find . -type dl -exec ls -dZ {} \; | awk '{ print "chcon -h " $0 }' > /data/new-rw-chcon.sh
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cd /data/new-rw
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sh /data/new-rw-chcon.sh
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cd /
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umount $path
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umount /data/new-rw
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echo " - Checking $partname image before flashing..."
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if [ "$convert_fs" = "ext4" ]; then
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e2fsck -f /data/new-rw.img
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else
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fsck.f2fs -f /data/new-rw.img
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fi
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echo " - Resizing partition $partname inside 'super' to $new_fs_size_mb MB using lptools"
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lptools resize $partname $(stat -c '%s' /data/new-rw.img)
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lptools unmap $partname
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lptools map $partname
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echo " - Writing our new R/W $partname image, please wait..."
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dd if=/data/new-rw.img of=/dev/block/bootdevice/by-name/$partname bs=1M
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rm -rf /data/new-rw*
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fi
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echo " - Remounting $path..."
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mount $path -o rw
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}
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fs_free_size_check() {
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local path=$1
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local label=$2
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local partname=$3
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local percent=$4
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echo " - Checking $path free space..."
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if dd if=/dev/zero of=$path/test bs=1 count=1 2>/dev/null; then
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echo " - ...succeeded."
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rm -f $path/test || true
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else
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echo " - ...No free space on $path, attempting to resize it..."
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echo " "
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rm -f $path/test || true
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resize_fs "$path" "$label" "$partname" "$percent"
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fi
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}
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echo " "
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echo "RO2RW"
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echo " "
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os=$(getprop ro.build.version.release)
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major=${os%%.*}
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dp=$(getprop ro.boot.dynamic_partitions)
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if [ $major -lt 9 ]; then
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echo " - This software is incompatible with Android $major."
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echo " - Installation aborted."
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echo " "
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exit 1
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fi
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echo " - Mounting /data..."
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mount /data || true
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if ! mount | grep '/data ' >/dev/null; then
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echo " - Mount failed. Aborting..."
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exit 3
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fi
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echo " - Mounting $ANDROID_ROOT..."
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if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
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mount -o rw $ANDROID_ROOT 2>/dev/null || true
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if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
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ANDROID_ROOT=/system_root
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echo " - Attempt failed. Mounting at $ANDROID_ROOT..."
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if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
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mount -o rw $ANDROID_ROOT
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if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
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echo " - Even that attempt failed. Aborting..."
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exit 2
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fi
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fi
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fi
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fi
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echo " - Mounting /vendor..."
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mount /vendor || true
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mount -o remount,rw /vendor || true
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if ! mount | grep '/vendor ' >/dev/null; then
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echo " - Mount failed. Aborting..."
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exit 3
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fi
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echo " - Mounting /product..."
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mount /product || true
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mount -o remount,rw /product || true
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if ! mount | grep '/product ' >/dev/null; then
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echo " - Mount failed. Aborting..."
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exit 3
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fi
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slot=$(getprop ro.boot.slot_suffix)
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fs_free_size_check $ANDROID_ROOT "/" system$slot 70 ext4
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fs_free_size_check /vendor vendor vendor$slot 50
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fs_free_size_check /product product product$slot 50
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echo " - Unmounting /product..."
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umount /product
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echo " - Unmounting /vendor..."
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umount /vendor
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echo " - Unmounting $ANDROID_ROOT..."
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umount $ANDROID_ROOT
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echo " "
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echo " - Finished."
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echo " "
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exit 0
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