Thanks Nicolò, your feedback was very useful! So it's not program-not-found but command-not-found and it's define here:
https://github.com/NixOS/nixpkgs/tree/master/nixos/modules/programs/command-not-found Then I found this https://github.com/NixOS/nixos-channel-scripts All this is pretty clear and simple. The main thing I wonder at this point is when the "generate-programs-index.cc" file is run. What would be the good entry point in substitute servers to populate such a database? -- Pierre Neidhardt https://ambrevar.xyz/
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