b89f941b20
If the user tries to run a program that doesn't exist from Bash, the
program name is looked up in a database that maps to Nix package
names. If it is found, we print out a message like:
$ pdflatex
The program ‘pdflatex’ is currently not installed. It is provided by
several packages. You can install it by typing one of the following:
nix-env -i tetex
nix-env -i texlive-core
If the environment variable $NIX_AUTO_INSTALL is set, the command is
installed and executed automatically:
$ hello --version
The program ‘hello’ is currently not installed. It is provided by
the package ‘hello’, which I will now install for you.
installing `hello-2.8'
hello (GNU hello) 2.8
Copyright (C) 2011 Free Software Foundation, Inc. ...
To use this, you must currently manually put the SQLite programs
database in /var/lib/nixos/programs.sqlite. In the future, this file
should be provided as part of the NixOS channel so it gets updated
automatically. To get a test version:
$ curl http://nixos.org/~eelco/programs.sqlite.xz | xz -d > /var/lib/nixos/programs.sqlite
49 lines
1.2 KiB
Nix
49 lines
1.2 KiB
Nix
# This module provides suggestions of packages to install if the user
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# tries to run a missing command in Bash. This is implemented using a
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# SQLite database that maps program names to Nix package names (e.g.,
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# "pdflatex" is mapped to "tetex").
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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commandNotFound = pkgs.substituteAll {
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name = "command-not-found";
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dir = "bin";
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src = ./command-not-found.pl;
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isExecutable = true;
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inherit (pkgs) perl;
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perlFlags = concatStrings (map (path: "-I ${path}/lib/perl5/site_perl ")
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[ pkgs.perlPackages.DBI pkgs.perlPackages.DBDSQLite ]);
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};
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in
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{
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environment.interactiveShellInit =
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''
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# This function is called whenever a command is not found.
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command_not_found_handle() {
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local p=/run/current-system/sw/bin/command-not-found
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if [ -x $p -a -f /var/lib/nixos/programs.sqlite ]; then
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# Run the helper program.
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$p "$1"
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# Retry the command if we just installed it.
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if [ $? = 126 ]; then
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"$@"
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fi
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else
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echo "$1: command not found" >&2
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fi
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}
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'';
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environment.systemPackages = [ commandNotFound ];
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# TODO: tab completion for uninstalled commands! :-)
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}
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