Script to download and repack Equation gcc toolchain installer as normal 7z acrhive.

repack-eq-gcc.sh

#!/bin/bash

# download an equation gcc installer package and repack as normal 7z archive.
# if the installer package has already been downloaded, then just use the
# cached file and repack .exe installer as .7z file.
#
# requires: bash, sh, echo, 7z, find, xargs, mkdir, rm
# requires: wget (if downloading original .exe)
#
# to ensure that no file is downloaded pass the --offline option
#
# usage is:
#   $ ./repack-eq-gcc.sh packagename [--offline]

set -e

usage() {
	echo "usage: ./repack-eq-gcc.sh package [--offline]"
	exit 1
}

# parse command line arguments
while [[ $# -gt 0 ]] 
do
arg="$1"
case $arg in
--offline)
	offline=Y
	shift
	;;
*)
	target="$1"
	shift
	;;	
esac
done

download() {
	filename="$1"
	url="$2"

	if [ -f "./cache/$filename" ]; then
		echo "cached      $filename"
	else
		if [ $offline = "Y" ]; then
			echo "not cached  $filename"
			echo "in offline mode, stopping"
			exit 1
		else
			echo "downloading $filename"
			if ! wget -O "./cache/$filename" "$url"; then
			#if ! curl -L -o "./cache/$filename" "$url"; then
				echo "download failed"
				rm -f "./cache/$filename"
				exit 1
			fi	
		fi
	fi
}

repack() {
	packname="$1"
	instname="$packname-installer"
	
	mkdir -p cache
	download $packname.exe ftp://ftp.equation.com/gcc/$packname.exe

	echo Removing previous repack directories
	rm -rf repack
	mkdir repack

	cd repack
	mkdir $packname
	mkdir $instname
	
	echo Extracting installer files from $packname.exe
	cd $instname
	7z x -y ../../cache/$packname.exe > /dev/null
	
	echo Copying directory structure
	cd source
	find . -type d | xargs -L 1 -I % mkdir -p ../../$packname/%
	
	echo Decompressing individual files
	# careful here with the quoting; this uses stdout redirection
	find . -type f -exec sh -c "bzip2 -d -c '{}' > '../../$packname/{}'" \;

	cd ../..
	
	echo Creating normal 7z archive $packname.7z in cache
	7z a ../cache/$packname.7z $packname > /dev/null
	
	cd ..

	# clean-up
	rm -rf ./repack
}

# need a package name
if [ -z "$target" ]; then
	usage
fi

# already repacked?
if [ -f "./cache/$target.7z" ]; then
	echo ./cache/$target.7z already exists.  Delete the file to force repack.
	exit 0
fi

# repack the installer as normal 7z archive
repack $target