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Provide missing command suggestions, Ubuntu style
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
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# This module provides suggestions of packages to install if the user | ||
# tries to run a missing command in Bash. This is implemented using a | ||
# SQLite database that maps program names to Nix package names (e.g., | ||
# "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 { | ||
name = "command-not-found"; | ||
dir = "bin"; | ||
src = ./command-not-found.pl; | ||
isExecutable = true; | ||
inherit (pkgs) perl; | ||
perlFlags = concatStrings (map (path: "-I ${path}/lib/perl5/site_perl ") | ||
[ pkgs.perlPackages.DBI pkgs.perlPackages.DBDSQLite ]); | ||
}; | ||
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in | ||
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{ | ||
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environment.interactiveShellInit = | ||
'' | ||
# This function is called whenever a command is not found. | ||
command_not_found_handle() { | ||
local p=/run/current-system/sw/bin/command-not-found | ||
if [ -x $p -a -f /var/lib/nixos/programs.sqlite ]; then | ||
# Run the helper program. | ||
$p "$1" | ||
# Retry the command if we just installed it. | ||
if [ $? = 126 ]; then | ||
"$@" | ||
fi | ||
else | ||
echo "$1: command not found" >&2 | ||
fi | ||
} | ||
''; | ||
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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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#! @perl@/bin/perl -w @perlFlags@ | ||
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use strict; | ||
use DBI; | ||
use DBD::SQLite; | ||
use Config; | ||
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my $program = $ARGV[0]; | ||
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my $dbPath = "/var/lib/nixos/programs.sqlite"; | ||
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my $dbh = DBI->connect("dbi:SQLite:dbname=$dbPath", "", "") | ||
or die "cannot open database `$dbPath'"; | ||
$dbh->{RaiseError} = 0; | ||
$dbh->{PrintError} = 0; | ||
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my $system = $ENV{"NIX_SYSTEM"} // $Config{myarchname}; | ||
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my $res = $dbh->selectall_arrayref( | ||
"select package from Programs where system = ? and name = ?", | ||
{ Slice => {} }, $system, $program); | ||
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if (!defined $res || scalar @$res == 0) { | ||
print STDERR "$program: command not found\n"; | ||
} elsif (scalar @$res == 1) { | ||
my $package = @$res[0]->{package}; | ||
if ($ENV{"NIX_AUTO_INSTALL"} // "") { | ||
print STDERR <<EOF; | ||
The program ‘$program’ is currently not installed. It is provided by | ||
the package ‘$package’, which I will now install for you. | ||
EOF | ||
; | ||
exit 126 if system("nix-env", "-i", $package) == 0; | ||
} else { | ||
print STDERR <<EOF; | ||
The program ‘$program’ is currently not installed. You can install it by typing: | ||
nix-env -i $package | ||
EOF | ||
} | ||
} else { | ||
print STDERR <<EOF; | ||
The program ‘$program’ is currently not installed. It is provided by | ||
several packages. You can install it by typing one of the following: | ||
EOF | ||
print STDERR " nix-env -i $_->{package}\n" foreach @$res; | ||
} | ||
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exit 127; |