#!/bin/bash
#rsync files from ISO image into directory

#examples
#
#rsync all files/sub directories from iso into a directory
#cpiso dvd.iso /tmp/dvd/
#
#rsync all files/sub directories under a specified directory from iso into a directory
#cpiso dvd.iso:pareht/directory/ /tmp/dvd/
#
#rsync a single file from iso into a directory
#cpiso dvd.iso:path/to/file /tmp/dvd/

if [ $# -lt 2 ]; then
	echo "Usage: $(basename $0) <ISO File>[:parent/directory] <Target Directory>" >&2;
	exit 1;
fi

colonPos=$(expr index "$1" ':');
if [ $colonPos -eq 0 ]; then
	colonPos=$(expr length "$1");
	colonPos=$[colonPos+1];
fi;

isoPathLength=$[colonPos-1];
image=${1:0:isoPathLength};
if [ ! -f "$image" ]; then
	echo "\"$image\" is no a file." >&2;
	hasError=1;
fi;

rawSource=${1:colonPos}
if [ "${rawSource:0:1}" == '/' ]; then
	rawSource=${rawSource##/};
fi;
if [ -z "$rawSource" ]; then
	rawSource='.';
fi;

rawTarget="$2";
if [ ${rawTarget:0:1} != "/" ]; then
	pwd=$(pwd);
	if [ "$pwd" == "/" ]; then
		target="$pwd""$rawTarget";
	else
		target="$pwd"/"$rawTarget";
	fi;
else
	target="$rawTarget";
fi;
if [ ! -d "$target" ]; then
	echo "\"$rawTarget\" is no a directory." >&2;
	hasError=1;
fi;

if [ $hasError ]; then
	exit 2;
fi;

tempdir=$(mktemp -d);
mount -o loop,ro "$image" "$tempdir";
if [ $? -ne 0 ]; then
	rmdir "$tempdir";
	echo 'Mount image failed.' >&2;
	exit 3;
fi;
pushd "$tempdir" &> /dev/null;

if [ ! -e "$rawSource" ]; then
	popd &> /dev/null;
	umount "$tempdir";
	rmdir "$tempdir";
	echo 'Source directory not exists.' >&2;
	exit 4;
elif [ -d "$rawSource" ]; then
	pushd "$rawSource" &> /dev/null;
	rsync -a --delete ./ "$target";
	popd &> /dev/null;
elif [ -f "$rawSource" ]; then
	cp "$rawSource" "$target";
fi;

popd &> /dev/null;
umount "$tempdir";
rmdir "$tempdir";