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# maintainer-scripts/empty -- lintian check script -*- perl -*-
#
# Copyright (C) 1998 Richard Braakman
# Copyright (C) 2002 Josip Rodin
# Copyright (C) 2016-2019 Chris Lamb <lamby@debian.org>
# Copyright (C) 2021 Felix Lechner
#
# 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.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, you can find it on the World Wide
# Web at https://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
package Lintian::Check::MaintainerScripts::Empty;
use v5.20;
use warnings;
use utf8;
use Const::Fast;
use Unicode::UTF8 qw(encode_utf8);
use Moo;
use namespace::clean;
with 'Lintian::Check';
const my $EMPTY => q{};
sub visit_control_files {
my ($self, $item) = @_;
return
unless $item->is_maintainer_script;
return
unless length $item->interpreter;
return
unless $item->is_open_ok;
open(my $fd, '<', $item->unpacked_path)
or die encode_utf8('Cannot open ' . $item->unpacked_path);
my $stashed = $EMPTY;
my $has_code = 0;
my $position = 1;
while (my $possible_continuation = <$fd>) {
chomp $possible_continuation;
# skip empty lines
next
if $possible_continuation =~ /^\s*$/;
# skip comment lines
next
if $possible_continuation =~ /^\s*\#/;
my $no_comment = remove_comments($possible_continuation);
# Concatenate lines containing continuation character (\)
# at the end
if ($no_comment =~ s{\\$}{}) {
$stashed .= $no_comment;
next;
}
my $line = $stashed . $no_comment;
$stashed = $EMPTY;
# Don't consider the standard dh-make boilerplate to be code. This
# means ignoring the framework of a case statement, the labels, the
# echo complaining about unknown arguments, and an exit.
if ( $line !~ /^\s*set\s+-\w+\s*$/
&& $line !~ /^\s*case\s+\"?\$1\"?\s+in\s*$/
&& $line !~ /^\s*(?:[a-z|-]+|\*)\)\s*$/
&& $line !~ /^\s*[:;]+\s*$/
&& $line !~ /^\s*echo\s+\"[^\"]+\"(?:\s*>&2)?\s*$/
&& $line !~ /^\s*esac\s*$/
&& $line !~ /^\s*exit\s+\d+\s*$/) {
$has_code = 1;
last;
}
} continue {
++$position;
}
$self->pointed_hint('maintainer-script-empty', $item->pointer)
unless $has_code;
return;
}
sub remove_comments {
my ($line) = @_;
return $line
unless length $line;
my $simplified = $line;
# Remove quoted strings so we can more easily ignore comments
# inside them
$simplified =~ s/(^|[^\\](?:\\\\)*)\'(?:\\.|[^\\\'])+\'/$1''/g;
$simplified =~ s/(^|[^\\](?:\\\\)*)\"(?:\\.|[^\\\"])+\"/$1""/g;
# If the remaining string contains what looks like a comment,
# eat it. In either case, swap the unmodified script line
# back in for processing (if required) and return it.
if ($simplified =~ m/(?:^|[^[\\])[\s\&;\(\)](\#.*$)/) {
my $comment = $1;
# eat comment
$line =~ s/\Q$comment\E//;
}
return $line;
}
1;
# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et
|
