#!/usr/bin/perl -w
# override-file -- lintian collector script

# Copyright (C) 1999 by Darren Benham
# Derived from debian-readme by Richard Braakman
#
# 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 http://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::coll::override_file;

no lib '.';

use strict;
use warnings;
use autodie;

use lib "$ENV{'LINTIAN_ROOT'}/lib";
use Lintian::Util qw(internal_error gunzip_file is_ancestor_of);

sub collect {
    my ($pkg, $type, $dir) = @_;

    -d "$dir/unpacked"
      or internal_error('override-file invoked with wrong dir argument');

    if (-e "$dir/override"){
        unlink("$dir/override");
    }

    # Pick the first of these files that exists.  Prefer
    # source/lintian-overrides to source.lintian-overrides for source
    # packages.
    my (@overrides, $file);
    if ($type eq 'source') {
        @overrides = (
            "$dir/unpacked/debian/source/lintian-overrides",
            "$dir/unpacked/debian/source.lintian-overrides"
        );
    } else {
        @overrides = ("$dir/unpacked/usr/share/lintian/overrides/$pkg");
    }
    for my $override (@overrides) {
        if (-f $override) {
            $file = $override;
        } elsif (-f "$override.gz") {
            $file = "$override.gz";
        }
        last if $file;
    }

    if (defined $file and not is_ancestor_of("$dir/unpacked", $file)) {
        # unsafe, pretend we didn't see it.
        undef $file;
    }

    if (not defined $file) {
        # no override found
    } elsif ($file =~ /\.gz$/) {
        gunzip_file($file, "$dir/override");
    } else {
        link($file, "$dir/override");
    }

    return;
}

collect(@ARGV) if $0 =~ m,(?:^|/)override-file$,;

1;

# Local Variables:
# indent-tabs-mode: nil
# cperl-indent-level: 4
# End:
# vim: syntax=perl sw=4 sts=4 sr et