[BUG] install fail silently (edge case for INSTALL_FAILED_UPDATE_INCOMPATIBLE)

[nktnet1]

Before you submit

• I have searched the issue tracker for open and closed issues that are similar to the feature request I want to file, without success.
• This issue contains only one bug.

What's going wrong?

Installation fails silently when there is a signature mismatch.

How do we reproduce it?

NOTE: reproduction steps require Device Owner or Dhizuku privileges

1. Build a debug version of any app that exists on F-Droid (or just build with a different signature). In my case, I used my app Webview Kiosk.

2. Download either OwnDroid or Test DPC - I used OwnDroid. Then

   • grant OwnDroid either Device Owner or Dhizuku access
   • click "Applications", find the app in step 1, then toggle the switch "Keep after uninstall"

3. Uninstall the app

4. Find the app on Droid-ify and attempt to install it

5. Observe that the final installation step stops abruptly with no errors/warnings

---

If you perform step 4 with the official F-Droid app, you will see an error about signature mismatch:

INSTALL_FAILED_UPDATE_INCOMPATIBLE: Existing package uk.nktnet.webviewkiosk signatures to not match newer version; ignoring!

What did you expect?

Show an error similar to the official F-Droid app store. It looks like the error display already exists in #1107 - just not showing.

Screenshots

1. OwnDroid keep after uninstall:

 

2. F-Droid correctly display error:

Your phone

Samsung Galaxy S21

Android version

15

Droid-ify version

0.7.1

Anything else?

As an aside, even if we toggle the "Incompatible versions" settings in Droid-ify, it still fails silently.