Layer for changing content of /system

01make_panini

#!/system/bin/sh
# Panini by shakalaca@23pin

LOG_FILE=/cache/panini.log
DISABLE_FILE=/su/etc/disable_panini

ROOT_MNT_SYSTEM=/su/mnt/system
ROOT_BIND_SYSTEM=/su/system_bind
ROOT_PANINI=/su/panini

# set to true if you want to use /system/vendor/app instead of /oem
# remember to do 'cp -af /system/vendor/app/* /su/panini/app/'
USE_VENDOR_APP=false

# before you try to disable this please turn on 'Enable su during boot'
JUST_INSTALL_SYSTEM_APP=true

log_d() {
  echo $1
  echo $1 >> $LOG_FILE
  log -p i -t PANINI "$1"
}

bind_mount() {
  mount -o bind $1 $2 &
  log_d "Glue $1 and $2 together"
}

is_mounted() {
  if [ ! -z "$2" ]; then
    cat /proc/mounts | grep $1 | grep $2, >/dev/null
  else
    cat /proc/mounts | grep $1 >/dev/null
  fi
  return $?
}

get_mount_dev() {
  _mount=`cat /proc/mounts | grep "$1"`
  echo ${_mount% /*}
}

process() {
  if [ "$1" == "/system" ]; then
    # one level only: 
    # system/<input>/dir
    EXTRA_OPT="-maxdepth 1"
  else
    EXTRA_OPT=""
  fi
  
  for t in `find $1/$2 $EXTRA_OPT -type d -o -type l -o -type f`; do 
    bind_fpath=$ROOT_BIND_SYSTEM${t#$1}
    panini_fpath=$ROOT_PANINI${t#$1}

    if [ -d $t ]; then
      # skip removed content
      if [ -f $panini_fpath/.remove ]; then
        echo Skipping $t
        rmdir $bind_fpath
      else
        mkdir -p $bind_fpath
        chmod 755 $bind_fpath
      fi
      continue
    fi
    
    if [ -L $t ]; then
      # copy link file
      cp -af $t $bind_fpath
    elif [ -f $t ]; then
      # skip '.remove'
      if [ "${t##*/}" != ".remove" ]; then
        touch $bind_fpath
        chmod 644 $bind_fpath
      fi
    fi
  done
}

install_system_app() {
  if [ -d /system/vendor/app ] && ($USE_VENDOR_APP); then
    bind_mount $ROOT_PANINI/app /system/vendor/app
  else
    if ( is_mounted /oem ); then
      mount -o rw,remount /oem
    else
      mount -o rw,remount /
    fi

    if [ ! -d /oem ]; then
      mkdir /oem
      chmod 755 /oem
    fi

    if [ ! -d /oem/app ]; then
      mkdir /oem/app
    fi
    chmod 755 /oem/app
    chcon u:object_r:system_file:s0 /oem/app
    
    bind_mount $ROOT_PANINI/app /oem/app
  fi
}

exclude_system_app() {
  for app in `ls $ROOT_PANINI/app`; do
    if [ -f $ROOT_PANINI/app/$app/.remove ]; then
      bind_mount $ROOT_PANINI/app/$app /system/app/$app
    fi
  done
}

if [ ! -d $ROOT_PANINI ]; then
  exit 0
fi

if [ -f $DISABLE_FILE ]; then
  exit 0
fi

if [ ! $(is_mounted $ROOT_MNT_SYSTEM )]; then
  # clean up the kitchen
  rm -f $LOG_FILE
  rm -rf $ROOT_BIND_SYSTEM

  # preparing bread
  # remove old tree
  mkdir -p $ROOT_BIND_SYSTEM
  chmod 755 $ROOT_BIND_SYSTEM

  mkdir -p $ROOT_MNT_SYSTEM
  chmod 755 $ROOT_MNT_SYSTEM
  mount -r -t ext4 $(get_mount_dev " /system ") $ROOT_MNT_SYSTEM

  # preparing roast beef
  # traverse panini directory
  for dir in `ls $ROOT_PANINI`; do
    # do not allow new root directory of /system
    if [ -d $ROOT_PANINI/$dir ] && [ -d /system/$dir ]; then
      if [ "$dir" == "app" ] && ($JUST_INSTALL_SYSTEM_APP); then
        install_system_app
        exclude_system_app
      else
        process $ROOT_PANINI $dir 
        process /system $dir
    
        bind_mount $ROOT_BIND_SYSTEM/$dir /system/$dir
      fi
    fi
  done

  # lets do it !
  for bind_f in `find $ROOT_BIND_SYSTEM -type f -o -type d`; do
    TARGET=/system${bind_f#$ROOT_BIND_SYSTEM}
    PANINI=$ROOT_PANINI${bind_f#$ROOT_BIND_SYSTEM}
    ORIGIN=$ROOT_MNT_SYSTEM${bind_f#$ROOT_BIND_SYSTEM}
   
    if [ -d $PANINI ]; then
      # skip directory for panini (mount file instead)
      log_d "Using panini for $TARGET"
    elif [ -f $PANINI ]; then
      bind_mount $PANINI $TARGET
    else
      bind_mount $ORIGIN $TARGET
    fi
  done
fi

README.txt

* create system tree named 'panini'
  panini/priv-app/delicious/delicious.apk
  panini/priv-app/dict/dict.apk
  panini/etc/dict/...
* adb push 01make_panini /data/local/tmp
* adb push panini /data/local/tmp
* adb shell
* su
* cp /data/local/tmp/01make_panini /su/su.d/01make_panini
* chmod 755 /su/su.d/01make_panini
* cp -r /data/local/tmp/panini /su/panini
* find /su/panini -type d -exec chmod 755 {} \;
* find /su/panini -type f -exec chmod 644 {} \;
* chown -R root:root /su/panini
* reboot

* for disable panini: touch /su/etc/disable_panini