mount ex4 image file

# ext4 이미지 파일을 mount 하는 방법
$ mount -t ext4 -o loop image_ext4.raw /mnt/ext4_target
@ read-only 마운드
$ mount -t ext4 -o loop,ro image_ext4.raw /mnt/ext4_target

# 참고 : 안드로이드 이미지를 raw 형식으로 변환
$ ./simg2img system.img image_ext4.raw

re-mount system & vendor partition rw mode on android

### w/ console, adb shell  or terminal
@ re-mount system partition rw option
// Android Pie (9.0)
# mount -o rw,remount /
// Android Oreo
# mount -o rw,remount /system

@ re-mount vendor partition rw option

# mount -o rw,remount /vendor

### w/ adb
$ adb connect
$ adb root
$ adb connect
@ re-mount system & vendor partition rw option
$ adb remount