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+# -*- perl -*- Lintian::Processable::Installable::Installed
+#
+# Copyright (C) 2008, 2009 Russ Allbery
+# Copyright (C) 2008 Frank Lichtenheld
+# Copyright (C) 2012 Kees Cook
+# Copyright (C) 2020 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::Installed;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+use List::SomeUtils qw(uniq);
+
+use Lintian::Index;
+
+const my $SLASH => q{/};
+
+use Moo::Role;
+use namespace::clean;
+
+=head1 NAME
+
+Lintian::Processable::Installable::Installed - access to collected data about the upstream (orig) sources
+
+=head1 SYNOPSIS
+
+    use Lintian::Processable;
+
+=head1 DESCRIPTION
+
+Lintian::Processable::Installable::Installed provides an interface to collected data about the upstream (orig) sources.
+
+=head1 INSTANCE METHODS
+
+=over 4
+
+=item installed
+
+Returns a index object representing installed files from a binary package.
+
+=cut
+
+has installed => (
+    is => 'rw',
+    lazy => 1,
+    default => sub {
+        my ($self) = @_;
+
+        my $index = Lintian::Index->new;
+        my $archive = $self->basename;
+        $index->identifier("$archive (installed)");
+        $index->basedir($self->basedir . $SLASH . 'unpacked');
+
+        # binary packages are anchored to the system root
+        # allow absolute paths and symbolic links
+        $index->anchored(1);
+
+        my @command = (qw(dpkg-deb --fsys-tarfile), $self->path);
+        my $errors = $index->create_from_piped_tar(\@command);
+
+        my @messages = uniq split(/\n/, $errors);
+        push(@{$index->unpack_messages}, @messages);
+
+        return $index;
+    }
+);
+
+=back
+
+=head1 AUTHOR
+
+Originally written by Felix Lechner <felix.lechner@lease-up.com> for
+Lintian.
+
+=head1 SEE ALSO
+
+lintian(1)
+
+=cut
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et