android-ndk-installer

#!/usr/bin/env bash
#
# This code based off of https://github.com/BuddyBuild/android-sdk-installer,
# which was based off of https://github.com/journeyapps/android-sdk-installer,
# which notes in the README that it, too, is MIT licensed.
#
# MIT License
#
# Additions/Modifications Copyright (c) 2017-2018 Vernier Software & Technology
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

#set -x
set -e

## This sets up a handler that allows sub-functions to terminate the calling
## shell when necessary. We use this to ensure that we can halt a build script
## that calls us when we need to
trap "exit 1" TERM
export _calling_script_pid="$$"

function abort_script() {
   local _abort_message="$1"

   if test -z "$_abort_message"; then
      _abort_message="$0: unspecified failure. Aborting script execution."
   fi

   echo "$_abort_message" >&2
   kill -s TERM $_calling_script_pid
}

# Initialize Argument variables
ARG_INSTALL_DIR="$HOME/Library/Android"
ARG_NDK_FILE=""
ARG_NDK_VER=""

function extract_ndk() {
   test -d "$ARG_INSTALL_DIR" || abort_script "extract_ndk(): Invalid ARG_INSTALL_DIR"
   test -f "$ARG_NDK_FILE" || abort_script "extract_ndk(): Invalid ARG_NDK_FILE"
   test -n "$ARG_NDK_VER" || abort_script "extract_ndk(): Invalid ARG_NDK_VER"

   unzip -q -o -d $ARG_INSTALL_DIR $ARG_NDK_FILE
}

function help() {
   cat << EOF
$0

Installs and sets up an Android NDK.

   -h, --help                 Display this help message.

   -i, --install-dir          The directory to install the Android NDK into.
                              Required.

   -f, --android-ndk          The Android NDK zip file to install. Required.

   -v, --android-ndk-version  The version of the Android NDK to install. This
                              must match the version of the Android NDK file
                              specified in --android-ndk. Required.

EOF
}

function main() {
   # Yanked from: https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
   # It's not that I didn't know how to parse bash arguments, it's that I wanted
   # a more portable way to do it than getopt(s), so in searching, this had
   # manual code to do it (which I modified slightly)
   while [[ $# -gt 0 ]]; do
      local _arg="$1"

      case $_arg in
         -h|--help)
            help
            return 0
            ;;
         -i|--install-dir)
            ARG_INSTALL_DIR="$2"
            shift
            shift
            ;;
         -f|--android-ndk)
            ARG_NDK_FILE="$2"
            shift
            shift
            ;;
         -v|--android-ndk-version)
            ARG_NDK_VER="$2"
            shift
            shift
            ;;
         *)
            # unknown option
            positional_args+=("$1")
            shift # past argument
            ;;
      esac
   done

   if ! test -d "$ARG_INSTALL_DIR"; then
      echo "Invalid installation directory: $ARG_INSTALL_DIR" >&2
      return 1
   fi

   if test -z "$(echo "$ARG_NDK_VER" | grep -E '^r\d+\w')"; then
      echo "Invalid Android NDK version: $ARG_NDK_VER" >&2
      return 1
   fi

   if ! test -f "$ARG_NDK_FILE"; then
      echo "Invalid Android NDK install file: $ARG_NDK_FILE" >&2
      return 1
   fi

   echo "$0: Extracting Android NDK into $ARG_INSTALL_DIR..."
   extract_ndk

   return 0
}

main "$@"