Query System Extension status on macOS 15

Hi all,

It's nice that macOS 15 allows users to control System Extensions in "Login Items & Extensions", but I am encountering some issues in determining if a user has disabled or removed a System Extension.

I will share my findings (as of macOS 15.1 24B5009l) for two scenarios and would appreciate any suggestions for better approaches.

Scenario 1: During first-time activation, there is no clear API to determine if the user uninstalls the extension before activation.

The code creates activationRequestForExtension:queue: and receives notifications via a delegate implementing OSSystemExtensionRequestDelegate. However, if the user does not authorize the activation of the System Extension and uninstalls it, the code receives request:didFailWithError: with error code OSSystemExtensionErrorRequestSuperseded. This error code is ambiguous, so I plan to submit a propertiesRequestForExtension:queue: and check the properties for each instance to determine if the user uninstalled the extension.

Scenario 2: After activation, it is unclear when the user enables or disables the extension.

It is somewhat easier in the enabled -> disabled scenario. The XPC connection will be invalidated, allowing me to submit another propertiesRequestForExtension:queue: in the XPC invalidation handler and check the result.

However, I am having trouble with the disabled -> enabled scenario. There is no event or trigger indicating that the user has enabled the extension, so I have to submit propertiesRequestForExtension:queue: repeatedly at short intervals, which is not ideal.

I wonder if there are better approaches. Any suggestions would be greatly appreciated.

Thanks & regards,

Shay