#!/bin/bash

# Bash script to assert that the current version of the NDK is at least the

# specified version. Prints 'true' to standard out if it's the right version,

# 'false' if it's not.

#

# Typically used like this, in your jni/Android.mk:

#

#   ifneq ($(shell $(LOCAL_PATH)/assert_ndk_version.sh "r5c" "ndk-dir"), true)

#     $(error NDK version r5c or greater required)

#   endif

#

# See https://gist.github.com/2878774 for asserting SDK version.

#

# Retrieved from: https://gist.github.com/jorgenpt/1961404 on 2014-06-03.

#

# Copyright (c) 2012, Lookout, Inc. All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

# 1. Redistributions of source code must retain the above copyright notice,

#    this list of conditions and the following disclaimer.

#

# 2. Redistributions in binary form must reproduce the above copyright

#    notice, this list of conditions and the following disclaimer in the

#    documentation and/or other materials provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED

# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#

# Author: jorgenpt@gmail.com (Jorgen Tjerno)

#         alexs.mac@gmail.com (Alex Stewart)

# Extracts 'r5c' into '5 c', also handles newer versions of the form

# 'r9d (64-bit)' and versions >= 10.

function get_major_minor() {

  # r9d (64-bit) -> '9d', also handle versions >= 10.

  local version=$(echo "$1" | sed 's/r\([0-9]\{1,2\}[a-z]\{0,1\}\).*/\1/')

  local major=$(echo "$version" | sed 's/\([0-9]\{1,2\}\).*/\1/')

  local minor=$(echo "$version" | sed 's/^[0-9]*//')

  echo "$major $minor"

}

if [[ -z "$2" ]]; then

  echo "Usage: $0 <required version> <NDK_ROOT>" >&2

  echo " For example: $0 r5c android-ndk-r9d" >&2

  exit 1

fi

# Assert that the expected version is at least 4.

declare -a expected_version

expected_version=( $(get_major_minor "$1") )

if [[ ${expected_version[0]} -le 4 ]]; then

  echo "Cannot test for versions less than r5: r4 doesn't have a version file." >&2

  echo false

  exit 1

fi

release_file="$2/RELEASE.TXT"

# NDK version r4 or earlier doesn't have a RELEASE.txt, and we just asserted

# that the person was looking for r5 or above, so that implies that this is an

# invalid version.

if [ ! -s "$release_file" ]; then

  echo false

  exit 0

fi

# Make sure the data is at least kinda sane.

version=$(grep '^r' $release_file)

declare -a actual_version

actual_version=( $(get_major_minor "$version") )

if [ -z "$version" ] || [ -z "${actual_version[0]}" ]; then

  echo "Invalid RELEASE.txt: $(cat $release_file)" >&2

  echo false

  exit 1

fi

if [[ ${actual_version[0]} -lt ${expected_version[0]} ]]; then

  echo "false"

elif [[ ${actual_version[0]} -eq ${expected_version[0]} ]]; then

  # This uses < and not -lt because they're string identifiers (a, b, c, etc)

  if [[ "${actual_version[1]}" < "${expected_version[1]}" ]]; then

    echo "false"

  else

    echo "true"

  fi

else

  echo "true"

fi