Replace duplicate runtime files with hardlinks to reduce dmg size.

packaging/macos/buildpackage.sh

@@ -181,6 +181,25 @@ build_platform() {
 	SetFile -c icnC "/Volumes/OpenRA/.VolumeIcon.icns"
 	SetFile -a C "/Volumes/OpenRA"
 
+	# Replace duplicate .NET runtime files with hard links to improve compression
+	if [ "${PLATFORM}" != "compat" ]; then
+		OIFS="$IFS"
+		IFS=$'\n'
+		for MOD in "Red Alert" "Tiberian Dawn"; do
+			for f in $(find /Volumes/OpenRA/OpenRA\ -\ ${MOD}.app/Contents/MacOS/*); do
+				g="/Volumes/OpenRA/OpenRA - Dune 2000.app/Contents/MacOS/"$(basename "${f}")
+				hashf=$(shasum "${f}" | awk '{ print $1 }')
+				hashg=$(shasum "${g}" | awk '{ print $1 }')
+				if [ "${hashf}" = "${hashg}" ]; then
+					echo "Deduplicating ${f}"
+					rm "${f}"
+					ln "${g}" "${f}"
+				fi
+			done
+		done
+		IFS="$OIFS"
+	fi
+
 	chmod -Rf go-w /Volumes/OpenRA
 	sync
 	sync