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#!/usr/bin/perl
# vim: shiftwidth=4 tabstop=4
#
# Copyright 2016-2022 by Marco d'Itri <md@Linux.IT>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
use warnings;
use strict;
use autodie;
use v5.16;
convert($ARGV[0] || '/etc/shells');
exit;
sub convert {
my ($file) = @_;
my (@shells, @nonusr_shells, %seen_in_usr);
open(my $in, '<', $file);
while (<$in>) {
chomp;
push(@shells, $_);
$seen_in_usr{$1} = 1 if m#^/usr(/s?bin/.+)#;
push(@nonusr_shells, $_) if m#^/s?bin/#;
}
close $in;
my @new_shells = # and add them to the list
map { "/usr$_" } # add /usr to their path
grep { not $seen_in_usr{$_} } # if they do not already exist in /usr
@nonusr_shells; # for each shell not in /usr
return unless @new_shells;
umask(0022);
open(my $out, '>', "$file.tmp");
say $out $_ foreach @shells, @new_shells;
close $out;
rename("$file.tmp", $file);
restore_context($file);
}
sub safe_system {
my (@cmd) = @_;
my $rc = system(@cmd);
die "Failed to execute @cmd: $!\n" if $rc == -1;
die "@cmd: rc=" . ($? >> 8) . "\n" if $rc;
}
sub restore_context {
my ($file) = @_;
return if not -x '/sbin/restorecon';
safe_system('restorecon', $file);
}
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