Shell script to check for Android NDK version.

assert_ndk_version.sh

#!/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"),true)
#     $(error NDK version r5c or greater required)
#   endif
#
# See https://gist.github.com/2878774 for asserting SDK version.
#
# Copyright 2012, Lookout, Inc. <[email protected]>
# Licensed under the BSD license. See the zLICENSE file for information.
#
# Includes contributions from [email protected] (Alex Stewart)
# and Philip Lamb.

# 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 "$1" ]]; then
  echo "Usage: $0 <required version>" >&2
  echo " For example: $0 r5c" >&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

if [[ ! -d "$ANDROID_NDK_ROOT" ]]; then
  if [[ -d "$ANDROID_NDK" ]]; then
     ANDROID_NDK_ROOT=$ANDROID_NDK
  else 
    # Attempt to find ndk-build on the path.
    ANDROID_NDK_ROOT=$(dirname $(which ndk-build) 2>/dev/null)
  fi
  if [ ! -s "$ANDROID_NDK_ROOT" ]; then
    echo "Failed to find either ANDROID_NDK_ROOT or ndk-build."
    echo false
    exit 1
  fi
fi

source_properties="$ANDROID_NDK_ROOT/source.properties"
release_file="$ANDROID_NDK_ROOT/RELEASE.TXT"

# NDK version r11 and later encode NDK version in source.properties.
if [ -s "$source_properties" ]; then
  version=$(sed -En -e 's/^Pkg.Revision[ \t]*=[ \t]*([0-9a-f]+)/r\1/p' $source_properties)
elif [ -s "$release_file" ]; then
  version=$(grep '^r' $release_file)
else
  # 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.
  echo false
  exit 0
fi

# Make sure the data is at least kinda sane.
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

zLICENSE

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.