Bogus "not available" dependency message with addons using built-in dependencies

[MilhouseVH]

Bug report

This is originally trac #18062

Describe the bug

Kodi includes some pre-installed addons by default, and these are listed as "not available" when installing addons that have a dependency on the pre-installed addon.

This is going to lead to increased support overhead dealing with bogus issues.

Expected Behavior

Kodi should not list pre-installed addons as "not available".

Actual Behavior

Kodi lists pre-installed installed addons as "not available".

Possible Fix

LibreELEC/LibreELEC.tv#3057 - this is a workaround that may only be suitable for LibreELEC. A better solution that works for all operating systems is required.

To Reproduce

1. Build latest Kodi master on Ubuntu.
2. Run Kodi
3. Go to Settings > Add-ons > Install from Repository > Program add-ons
4. Click on Advanced MAME Launcher
5. Click on Dependencies
   

The missing dependency is installed, enabled, and available:

neil@nm-linux:~/projects/kodi.git$ ls -la ./kodi-build/addons/script.module.pil/
total 12
drwxrwxr-x  2 neil neil 4096 Sep 23 23:18 .
drwxrwxr-x 53 neil neil 4096 Sep 23 23:18 ..
-rw-rw-r--  1 neil neil  421 Sep 23 23:18 addon.xml

Even though the dependency is reported as "not available", if the user ignores the "not available" message and proceeds with the add-on installation:

then the add-on will be installed and work correctly with the allegedly "not available" dependencies. Kodi will continue to claim the dependency is missing even after installing the add-on...

Kodi appears to fail to find any "pre-installed" dependency when installing an add-on, which is going to lead to increased support overhead as we see this a lot with LibreELEC - we include script.module.pycrptodome (a dependency of Netflix etc.) and os.libreelec.tv (a dependency of various LibreELEC repository add-ons), both of which are misreported by Kodi as being "not available", generating unnecessary support issues.

Is there any way that Kodi can avoid mis-reporting pre-installed dependencies as not available when they are in fact available?

Your Environment

Used Operating system:

• Android

• iOS

• Linux

• OSX

• Raspberri-Pi

• Windows

• Windows UWP

• Operating system version/name: Ubuntu 17.10

• Kodi version: Latest Kodi 18 master at the time of writing (94eff69)

note: Once the issue is made we require you to update it with new information or Kodi versions should that be required.
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