shell script for downloading the latest pharo 3 image

getPharo30Image

#!/usr/bin/env bash

# stop the script if a single command fails
set -e

# define an echo that only outputs to stderr
echoerr() { echo "$@" 1>&2; }
#  try to use curl if possible
if [[ `which curl 2> /dev/null` ]]; then
	DOWNLOAD="curl --silent --location --compressed ";
	DOWNLOAD_TO="$DOWNLOAD --output ";
elif [[ `which wget 2> /dev/null` ]]; then
	DOWNLOAD_TO="wget --quiet --output-document=";
	DOWNLOAD="$DOWNLOAD_TO-";
else
	echo "Please install curl or wget on your machine";
	exit 1
fi




# ARGUMENT HANDLING =============================================================
if { [ "$1" = "-h" ] || [ "$1" = "--help" ]; }; then
	echo "This script downloads the latest Pharo 40 Image.
The following artifacts are created:
    Pharo.changes  A changes file for the Pharo Image
    Pharo.image    A Pharo image, to be opened with the Pharo VM
"
	exit 0;
elif [ $# -gt 0 ]; then
	echo "--help is the only argument allowed"
	exit 1;
fi


# DOWNLOADING THE LATEST PHARO 30 IMAGE =========================================
IMAGE_URL="http://files.pharo.org/image/30/latest.zip"

echoerr "Downloading the latest 30 Image:"
echoerr "    $IMAGE_URL"

TMP_DIR=`mktemp -d image.XXXXXX`
$DOWNLOAD_TO$TMP_DIR/image.zip $IMAGE_URL

unzip -q $TMP_DIR/image.zip -d $TMP_DIR
rm -rf image image.zip

PHARO_IMAGE=`find $TMP_DIR -name \*.image`
mv "$PHARO_IMAGE" Pharo.image

PHARO_CHANGES=`find $TMP_DIR -name \*.changes`
mv "$PHARO_CHANGES" Pharo.changes;

rm -r $TMP_DIR >> /dev/null

echo Pharo.image