command-not-found executable is not available

[rrnewton]

Issue description

I see various discussion of command-not-found (#1751, #12044, #11996) discussing how to fix its database, etc, but I have the much more basic problem that I don't have a command-not-found binary on my NixOS system.

I can see where the source is, and I can see that in modules-list.nix it is referenced, so this commit disabling it must no longer apply.

I don't see it listed in the configuration options. I tried adding this to my configuration.nix but I got an error:

config.programs.command-not-found.enable = true;

Steps to reproduce

Fresh install of nixos and then upgrade to unstable channel, 18.03pre114421.799435b7ca (Impala).
Attempt to run command-not-found.

Technical details

• System: 18.03pre114421.799435b7ca (Impala)
• Nix version: nix-env (Nix) 1.11.14
• Nixpkgs version: "18.03pre114421.799435b7ca"
• Sandboxing enabled: true

[pbogdan]

Could you try with programs.command-not-found.enable = true; (without the config. prefix)? That would seem to be working for me on the same nixpkgs revision.

[rrnewton]

Thanks! That does the trick. I wonder why it wasn't on by default.

I can't see from where I should have learned that. (It feels like one small example of the oft-discussed discoverability and UX issues, as described in https://github.com/NixfiOS/nix/issues/684 .)

The "Appendix A" does not define this command-not-found option. Should I send a documentation PR that adds it to that appendix?

[pbogdan]

AFAIK the manual hosted on nixos.org is for the stable version of NixOS. You can however browse the manual generated for the current version of your system by running nixos-help command.

[rrnewton]

Ah, good call, it's already there! All is in order.