create .dmg image after built on Xcode

create_dmg.sh

set -ex

[ "$ACTION" = build ] || exit 0
[ "$BUILD_VARIANTS" = "normal" ] || exit 0
[ "$CONFIGURATION" = "Release" ] || exit 0

dir="$TEMP_FILES_DIR/disk"
dmg="$HOME/Desktop/$PROJECT_NAME.dmg"

rm -rf "$dir"
mkdir "$dir"
cp -R "$BUILT_PRODUCTS_DIR/$PROJECT_NAME.app" "$dir"
cp -R "$PROJECT_DIR/README.txt" "$dir"
cp -R "$PROJECT_DIR/LICENSE.txt" "$dir"
ln -s "/Applications" "$dir/Applications"
rm -f "$dmg"
hdiutil create -srcfolder "$dir" -volname "$PROJECT_NAME" "$dmg"
rm -rf "$dir"