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+# -*- perl -*- Lintian::Processable::Installable::Overrides
+#
+# Copyright (C) 2019-2021 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, see <http://www.gnu.org/licenses/>.
+
+package Lintian::Processable::Installable::Overrides;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+use PerlIO::gzip;
+use List::SomeUtils qw(first_value);
+use Unicode::UTF8 qw(valid_utf8 decode_utf8 encode_utf8);
+
+use Moo::Role;
+use namespace::clean;
+
+with 'Lintian::Processable::Overrides';
+
+const my $EMPTY => q{};
+
+=head1 NAME
+
+Lintian::Processable::Installable::Overrides - access to override data
+
+=head1 SYNOPSIS
+
+ use Lintian::Processable;
+
+=head1 DESCRIPTION
+
+Lintian::Processable::Installable::Overrides provides an interface for overrides.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item override_file
+
+=cut
+
+has override_file => (
+ is => 'rw',
+ lazy => 1,
+ default => sub {
+ my ($self) = @_;
+
+ my $unzipped = 'usr/share/lintian/overrides/' . $self->name;
+
+ my @candidates = map { $unzipped . $_ } ($EMPTY, '.gz');
+
+ # pick the first
+ my $override_item= first_value { defined }
+ map { $self->installed->lookup($_) } @candidates;
+
+ return $override_item;
+ }
+);
+
+=item overrides
+
+=cut
+
+has overrides => (
+ is => 'rw',
+ lazy => 1,
+ default => sub {
+ my ($self) = @_;
+
+ return []
+ unless defined $self->override_file;
+
+ my $contents = $EMPTY;
+
+ if ($self->override_file->name =~ m{ [.]gz $}x) {
+
+ my $local_path = $self->override_file->unpacked_path;
+
+ open(my $fd, '<:gzip', $local_path)
+ or die encode_utf8("Cannot open $local_path.");
+
+ local $/ = undef;
+ my $bytes = <$fd>;
+
+ $contents = decode_utf8($bytes)
+ if valid_utf8($bytes);
+
+ close $fd;
+
+ } else {
+ $contents = $self->override_file->decoded_utf8;
+ }
+
+ return $self->parse_overrides($contents);
+ }
+);
+
+1;
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for
+Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et