From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Nicol=C3=B2?= Balzarotti <anothersms@gmail.com>
Subject: Re: Package file indexing
Date: Wed, 15 Jan 2020 18:27:15 +0100
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To: Pierre Neidhardt <mail@ambrevar.xyz>, Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Guix-devel <guix-devel@gnu.org>

Hi Pierre,
on NixOS, if you try to run the name of a program that you don't have
installed (eg: $ endlessh) you get:

The program =E2=80=98endlessh=E2=80=99 is currently not installed. You can =
install it by typing:
nix-env -iA nixos.endlessh

program-not-found is a perl script that uses an sqlite file placed
under:
/nix/var/nix/profiles/per-user/root/channels/nixos/programs.sqlite

I don't know how this database is created. Table structure:

CREATE TABLE Programs (
    name        text not null,
    system      text not null,
    package     text not null,
    primary key (name, system, package)
  );

like kbdinfo|i686-linux|kbd

(a nice thing I just found reading it: if you set NIX_AUTO_INSTALL=3D1 it
automatically spawns a nix-shell with the required package and starts
the program)

Nicol=C3=B2

Pierre Neidhardt <mail@ambrevar.xyz> writes:

> Ludovic Court=C3=A8s <ludo@gnu.org> writes:
>
>> You should look at how NixOS does it for its =E2=80=98command-not-found=
=E2=80=99 support
>> (I think it=E2=80=99s part of NixOS, not Nix).  IIRC they distribute an =
SQLite
>> database, but it=E2=80=99s a pretty ad-hoc mechanism without authenticat=
ion.
>
> I haven't found this yet, but I found this instead:
>
> https://github.com/bennofs/nix-index/pulls
>
> Tobias, are you sure Nix has such a feature?
>
> --=20
> Pierre Neidhardt
> https://ambrevar.xyz/