#!/bin/bash
#
# Copyright (C) 2007 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

PROGNAME=`basename $0`

function cleantmp
{
    if [ ! -z "$TMPDIR" ]
    then
        rm -rf "$TMPDIR"
        TMPDIR=
    fi
}

function println
{
    if [ $# -gt 0 ]
    then
        echo "$PROGNAME: $@"
    fi
}

function fail
{
    println "$@"
    cleantmp
    exit 1
}

function usage
{
    println "$@"
    echo "Usage: $PROGNAME <input file> <output file>"
    fail
}

OTATOOL=`which otatool`
if [ -z "$OTATOOL" ]
then
    OTATOOL="`dirname $0`/otatool"
    if [ ! -x "$OTATOOL" ]
    then
        fail "Can't find otatool"
    fi
fi


if [ $# -ne 2 ]
then
    usage
fi

INFILE="$1"
OUTFILE="$2"

if [ ! -f "$INFILE" ]
then
    fail "$INFILE doesn't exist or isn't a file"
fi

if [ -z "$OUTFILE" ]
then
    usage "Output file not specified"
fi

if [ -d "$OUTFILE" ]
then
    usage "Output file may not be a directory"
fi

if [ "$INFILE" -ef "$OUTFILE" ]
then
    fail "Refusing to use the input file as the output file"
fi

TMPDIR=`mktemp -d "/tmp/$PROGNAME.XXXXXX"`
if [ $? -ne 0 ]
then
    TMPDIR=
    fail "Can't create temporary directory"
fi

ORIGSCRIPT="$TMPDIR/orig"
NEWSCRIPT="$TMPDIR/new"

"$OTATOOL" --dump-script "$INFILE" |
awk '
    { print }
    /^format SYSTEM:$/ {
        print "delete_recursive DATA:"
    }
' > "$NEWSCRIPT"
if [ $? -ne 0 ]
then
    fail "Couldn't modify script"
fi

"$OTATOOL" --replace-script "$NEWSCRIPT" -o "$OUTFILE" "$INFILE"
if [ $? -ne 0 ]
then
    fail "Couldn't replace script"
fi

cleantmp