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
1.3 KiB
Perl
49 lines
1.3 KiB
Perl
#! @perl@/bin/perl -w @perlFlags@
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use strict;
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use DBI;
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use DBD::SQLite;
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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", "", "")
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or die "cannot open database `$dbPath'";
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$dbh->{RaiseError} = 0;
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$dbh->{PrintError} = 0;
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my $system = $ENV{"NIX_SYSTEM"} // $Config{myarchname};
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my $res = $dbh->selectall_arrayref(
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"select package from Programs where system = ? and name = ?",
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{ Slice => {} }, $system, $program);
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if (!defined $res || scalar @$res == 0) {
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print STDERR "$program: command not found\n";
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} elsif (scalar @$res == 1) {
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my $package = @$res[0]->{package};
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if ($ENV{"NIX_AUTO_INSTALL"} // "") {
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print STDERR <<EOF;
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The program ‘$program’ is currently not installed. It is provided by
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the package ‘$package’, which I will now install for you.
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EOF
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;
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exit 126 if system("nix-env", "-i", $package) == 0;
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} else {
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print STDERR <<EOF;
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The program ‘$program’ is currently not installed. You can install it by typing:
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nix-env -i $package
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EOF
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}
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} else {
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print STDERR <<EOF;
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The program ‘$program’ is currently not installed. It is provided by
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several packages. You can install it by typing one of the following:
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EOF
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print STDERR " nix-env -i $_->{package}\n" foreach @$res;
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}
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exit 127;
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