I’d like to print my contact info in case someone finds my laptop and turns it on. (I know, a physical sticker would be a better idea 
- but I’m a geek…)
It would need to happen in (before?) stage 1 before the disk encryption password entry.
I thought to patch the stage-1-init.sh - but how can I use a patched thing (somehow related to system.build I guess?)
… and - is it a bad idea? 
You can just add something like this to configuration.nix
boot.initrd.preDeviceCommands = ''
echo I am tennox
'';
Though this won’t work with systemd initrd. For that, it’s trickier because systemd owns the console instead of PID 1 just being a shell script.
In either case, I’d be tempted to make a plymouth theme that displays this stuff. That way you could even have it display a qr code with all the relevant information in it.
Thanks, preDeviceCommands gets the job done:
Perhaps there should be a dedicated option for displaying messages at the top.
Amazing! Thanks for the quick reply & easy solution 
(sorry for taking long to reply )
boot.initrd.preDeviceCommands = ''
echo -e "If found, please contact:\nManuel ...\n+49...\nemail@domain.org" \
| ${pkgs.neo-cowsay}/bin/cowsay --bold --aurora -f dragon
'';
How did you do the frame and indentation?
The frame is box-drawing characters, for now just in a string literal e.g.:
info '┌─────────┐'
info '│ Example │'
info '└─────────┘'
I’d prefer to do it programmatically but haven’t looked into that yet.
This is so cute. Thank you for this.