typelib not bind to libdiodon

[Oliver Sauder]

When accessing a Diodon class in python through typelib does following error occur:

 Warning: cannot retrieve class for invalid (unclassed) type 'void'
  storage = Diodon.ZeitgeistClipboardStorage()
Traceback (most recent call last):
  File "./get_history_diodon.py", line 13, in <module>
    main()
  File "./get_history_diodon.py", line 7, in main
    storage = Diodon.ZeitgeistClipboardStorage()

This indicates that the typelib library is not bind with the libdiodon shared library and cannot therefore find the type.

[Mustafa Nural (mvnural)]

I'm not sure if it's the same issue but a similar error exists with the latest version in 20.04 as well. When I try to install https://github.com/RedHatter/diodon-gnome-indicator extension, I get the following error from gnome-shell:

gnome-shell[16127]: JS ERROR: Extension <email address hidden>:
Error: Unsupported type void, deriving from fundamental void
 @/<email address hidden>/controller.js:1:35
 @/<email address hidden>/extension.js:13:20
 _callExtensionInit@resource:///org/gnome/shell/ui/extensionSystem.js:403:13
 _callExtensionEnable@resource:///org/gnome/shell/ui/extensionSystem.js:144:18
 _onEnabledExtensionsChanged/<@resource:///org/gnome/shell/ui/extensionSystem.js:475:18
 _onEnabledExtensionsChanged@resource:///org/gnome/shell/ui/extensionSystem.js:474:11
 _init/createCheckedMethod/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:529:46
 enableExtension@resource:///org/gnome/shell/ui/extensionSystem.js:193:29
 EnableExtension@resource:///org/gnome/shell/ui/shellDBus.js:307:38
 _handleMethodCall@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:327:38
 _wrapJSObject/<@resource:///org/gnome/gjs/modules/core/overrides/Gio.js:404:34

gnome-shell[16127]: Failed to load shared library 'libdiodon' referenced by the typelib: libdiodon.so: cannot open shared object file: No such file or directory

I believe this is a packaging error since the problem is easily fixed with creating a symlink for libdiodon like the following.

sudo ln -s /usr/lib/x86_64-linux-gnu/libdiodon.so.0 /usr/lib/x86_64-linux-gnu/libdiodon.so

I have version 1.9.0-1 from the default repository (gir1.2-diodon-1.0, libdiodon0, diodon).
gnome-shell version 3.36.1-5ubuntu1.

[Oliver Sauder (sao)]

The diodon-dev package actually contains this symlink which is enforced through https://lintian.debian.org/tags/non-dev-pkg-with-shlib-symlink.html to be in that package.

I have looked at other packages with typelibs and they do it the same way. The gir package doesn't depend on the dev package either there.

I think it is a bit odd but diodon-dev needs to be installed to use Gnome indicator.

If you find some hinters how this can be avoided please create a new bug report with those comments.