get_gcc_5_4-2016q3_msys.sh

#!/bin/bash
#
# BSD 3-Clause License
#
# Copyright (c) 2018, KORG INC.
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# modification, are permitted provided that the following conditions are met:
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#   list of conditions and the following disclaimer.
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#   this software without specific prior written permission.
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SCRIPT_DIR="$(pwd)/$(dirname $0)"

pushd ${SCRIPT_DIR} 2>&1 > /dev/null

PKGNAME="gcc-arm-none-eabi"
VERSION="5-2016-q3"

ARCHIVE_URL="https://developer.arm.com/-/media/Files/downloads/gnu-rm/5_4-2016q3/gcc-arm-none-eabi-5_4-2016q3-20160926-win32-zip.zip"
ARCHIVE_SHA1="f6c05562b5f031bf79ec13c6f7311245c717be1b"
ARCHIVE_NAME="gcc-arm-none-eabi-5_4-2016q3-20160926-win32.zip"
UNPACKED_NAME="gcc-arm-none-eabi-5_4-2016q3"

if [[ "${OSTYPE}" == "msys" ]]; then
    echo ">> Assuming msys platform."
else
    echo ">> This script is meant for msys."
    popd 2>&1 > /dev/null
    exit 1
fi

# assert_success(fail_msg)
assert_success() {
    [[ $? -eq 0 ]] && return 0
    [[ ! -z "$1" ]] && echo "Error: $1" 
    popd 2>&1 > /dev/null
    return 1
}

AWK=$(which awk) || assert_success "dependency not found..." || exit $?

CURL=$(which curl) || assert_success "dependency not found..." || exit $?

UNZIP=$(which unzip) || assert_success "dependency not found..." || exit $?

SHA1SUM=$(which sha1sum) || assert_success "dependency not found..." || exit $?

# test_sha1sum(sha1, path_to_file)
test_sha1sum() {
    SHA1=$(${SHA1SUM} "$2" | ${AWK} '{print $1};')
    [[ "${SHA1}" != "$1" ]] && return 1
    return 0
}

if [[ ! -f "${ARCHIVE_NAME}" ]]; then
    echo ">> Downloading..."
    ${CURL} -# -L -o "${ARCHIVE_NAME}" "${ARCHIVE_URL}"
    assert_success "Download of ${ARCHIVE_NAME} failed..." || exit $?
fi

test_sha1sum "${ARCHIVE_SHA1}" "${ARCHIVE_NAME}"
assert_success "SHA1 mismatch. Try redownloading the archive..." || exit $?

echo ">> Unpacking..."
${UNZIP} -u -q "${ARCHIVE_NAME}" -d "${UNPACKED_NAME}"
assert_success "Could not unpack archive..." || exit $?

echo ">> Cleaning up..."
rm -f "${ARCHIVE_NAME}"
assert_success "Could not delete temporary archive..." || exit $?

popd 2>&1 > /dev/null