Open an application on gdm3 login screen

Desktop
1

Hi there!

I have a requirement to inform the user about something before they log in to the system. I created a simple app that displays a nice window with the information, and now I’m trying to show it at the GDM3 login screen.

I managed to find the article about /etc/gdm/Init/Default file (help.gnome.org), but it seems that this approach does not work in GDM3—at least, I couldn’t make it work.

Is there any way to run/show another app on login screen at all?

Any pointers on this would be helpful.

2

I occasionally notice baobab (Disk Usage Analyser) report Low Disk Space notification message in login screen.

Not sure if that’s a bug or a supported feature.

3

You can specify a banner text that will be shown on the login screen: Display a text banner on the login screen

I occasionally notice baobab (Disk Usage Analyser) report Low Disk Space notification message in login screen.

That message is not from baobab, but generated by gnome-settings-daemon, which puts an action button in the notification to launch baobab when showing that notification in a regular session. Not sure if that button is included when showing in gdm, but it probably shouldn’t be.

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5

As a final solution I chose PAM (Pluggable Authentication Modules). It allows to natively show message to user at any system.
Thanks everyone for ideas!