backuptool_ab: Make copy_file preserve file/directory attrs

export backuptool_ab=true

copy_file() {

  # toybox's cp doesn't do directories correctly for whatever reason

  mkdir -p `dirname $2`

  old=`umask`

  umask 0322

  mkdir -m755 -p `dirname $2`

  umask "$old"

  cp -dp "$1" "$2"

  # symlinks don't have a context

  if [ ! -L "$1" ]; then

    # it is assumed that every label starts with 'u:object_r' and has no white-spaces

    local context=`ls -Z "$1" | grep -o 'u:object_r:[^ ]*' | head -1`

    chcon "$context" "$2"

  fi

  cp -dp --preserve=a "$1" "$2"

}

backup_file() {

  if [ -e "$1" -o -L "$1" ]; then

    local FILE=`basename "$1"`

    local DIR=`dirname "$1"`

    # dont backup any apps that have odex files, they are useless

    if ( echo "$FILE" | grep -q "\.apk$" ) && [ -e `echo "$1" | sed -e 's/\.apk$/\.odex/'` ]; then

    if ( echo "$1" | grep -q "\.apk$" ) && [ -e `echo "$1" | sed -e 's/\.apk$/\.odex/'` ]; then

      echo "Skipping odexed apk $1";

    else

      mkdir -p "$C/$DIR"

      copy_file "$1" "$C/$DIR/$FILE"

      copy_file "$1" "$C/$1"

    fi

  fi

}

restore_file() {

  local FILE=`basename "$1"`

  local DIR=`dirname "$1"`

  if [ -e "$C/$DIR/$FILE" -o -L "$C/$DIR/$FILE" ]; then

    if [ ! -d "/postinstall/$DIR" ]; then

      mkdir -p "/postinstall/$DIR";

    fi

    copy_file "$C/$DIR/$FILE" "/postinstall/$1";

  if [ -e "$C/$1" -o -L "$C/$1" ]; then

    copy_file "$C/$1" "/postinstall/$1";

    if [ -n "$2" ]; then

      echo "Deleting obsolete file $2"

      rm "$2";