1 files changed, 104 insertions, 0 deletions
diff --git a/lib/Lintian/Check/Debian/Patches.pm b/lib/Lintian/Check/Debian/Patches.pm
new file mode 100644
index 0000000..b9a3ec2
--- /dev/null
+++ b/lib/Lintian/Check/Debian/Patches.pm
@@ -0,0 +1,104 @@
+# debian/patches -- lintian check script -*- perl -*-
+#
+# Copyright (C) 2007 Marc Brockschmidt
+# Copyright (C) 2008 Raphael Hertzog
+# Copyright (C) 2018-2019 Chris Lamb <lamby@debian.org>
+# 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, 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::Debian::Patches;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Path::Tiny;
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+sub source {
+    my ($self) = @_;
+
+    my @patch_system;
+
+    # Get build deps so we can decide which build system the
+    # maintainer meant to use:
+    my $build_deps = $self->processable->relation('Build-Depends-All');
+
+    # Get source package format
+    my $source_format = $self->processable->fields->value('Format');
+    my $quilt_format = ($source_format =~ /3\.\d+ \(quilt\)/) ? 1 : 0;
+
+    my $debian_dir = $self->processable->patched->resolve_path('debian/');
+    return
+      unless defined $debian_dir;
+
+    my $patch_dir = $debian_dir->resolve_path('patches');
+
+    # Find debian/patches/series, assuming debian/patches is a (symlink to a)
+    # dir.  There are cases, where it is a file (ctwm: #778556)
+    my $patch_series;
+    $patch_series
+      = $self->processable->patched->resolve_path('debian/patches/series');
+
+    push(@patch_system, 'dpatch')
+      if $build_deps->satisfies('dpatch');
+
+    push(@patch_system, 'quilt')
+      if $quilt_format || $build_deps->satisfies('quilt');
+
+    $self->hint('patch-system', $_) for @patch_system;
+
+    $self->hint('more-than-one-patch-system')
+      if @patch_system > 1;
+
+    if (@patch_system && !$quilt_format) {
+
+        my $readme = $debian_dir->resolve_path('README.source');
+        $self->hint('patch-system-but-no-source-readme')
+          unless defined $readme;
+    }
+
+    my @direct_changes
+      = grep { !m{^debian/} } keys %{$self->processable->diffstat};
+    if (@direct_changes) {
+
+        my $files = $direct_changes[0];
+        $files .= " and $#direct_changes more"
+          if @direct_changes > 1;
+
+        $self->hint('patch-system-but-direct-changes-in-diff', $files)
+          if @patch_system;
+
+        $self->hint('direct-changes-in-diff-but-no-patch-system', $files)
+          unless @patch_system;
+    }
+
+    return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et