a rather minimal dmg script for xcode

gistfile1.sh

set -ex

dir="$TEMP_FILES_DIR/disk"
dmg="$BUILT_PRODUCTS_DIR/$PROJECT_NAME.dmg"
dmg_options="-imagekey zlib-level=9 -format UDZO"

rm -rf "$dir"
mkdir "$dir"
cp -R "$BUILT_PRODUCTS_DIR/$PROJECT_NAME.app" "$dir"
chmod -Rf go-w "$dir"
ln -s "/Applications" "$dir/Applications"
rm -f "$dmg"
hdiutil create -srcfolder "$dir" -volname "$PROJECT_NAME" $dmg_options "$dmg" 
hdiutil internet-enable -yes "$dmg"
rm -rf "$dir"