private static boolean isDmgPresent() {
		return DmgPresentHolder.DMG_PRESENT;
	}
A cached check for the presence of the DMG module.

@return true if the DMG module, is present; otherwise, false.
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/ios/dmg/DmgClientFileSystemFactory.java