Allow configurable SPDX check exclusions

@SPDX_IGNORE may now be set in the perl.conf test configuration file
to specify an additional list of regular expressions matching files
that the check for SPDX license headers should ignore.

NEWS

@@ -7,6 +7,10 @@ rra-c-util 10.5 (unreleased)
     add several new GCC warnings and related flags added between GCC 9.2
     and 13.2.
 
+    @SPDX_IGNORE may now be set in the perl.conf test configuration file
+    to specify an additional list of regular expressions matching files
+    that the check for SPDX license headers should ignore.
+
     Ignore files created by the Perl Carton tool, JSON files, and
     temporary files generated by tests when checking for SPDX licenses and
     Perl strictness in standard tests.

perl/t/docs/spdx-license.t

@@ -38,6 +38,7 @@ use warnings;
 use lib 't/lib';
 
 use Test::RRA qw(skip_unless_automated);
+use Test::RRA::Config qw(@SPDX_IGNORE);
 
 use File::Find qw(find);
 use Test::More;
@@ -60,6 +61,7 @@ my @IGNORE = (
     qr{ ~ \z }xms,                          # Backup files
 );
 my @IGNORE_PATHS = (
+    @SPDX_IGNORE,
     qr{ \A [.] / [.] git/ }xms,             # Version control files
     qr{ \A [.] / [.] pc/ }xms,              # quilt metadata files
     qr{ \A [.] /_build/ }xms,               # Module::Build metadata

tests/data/perl.conf

@@ -1,4 +1,6 @@
 # Configuration for Perl tests.  -*- perl -*-
+#
+# See the documentation for Test::RRA::Config for all available options.
 
 # Ignore these top-level directories for perlcritic testing.
 @CRITIC_IGNORE = qw();

tests/docs/spdx-license-t

@@ -39,6 +39,7 @@ use lib "$ENV{C_TAP_SOURCE}/tap/perl";
 
 use Test::RRA qw(skip_unless_automated);
 use Test::RRA::Automake qw(all_files automake_setup);
+use Test::RRA::Config qw(@SPDX_IGNORE);
 
 use File::Basename qw(basename);
 use Test::More;
@@ -58,6 +59,7 @@ my @IGNORE = (
     qr{ [.] output \z }xms,             # Test data
 );
 my @IGNORE_PATHS = (
+    @SPDX_IGNORE,
     qr{ \A debian/ }xms,                       # Found in debian/* branches
     qr{ \A docs/metadata/ }xms,                # Package license should be fine
     qr{ \A docs/protocol[.](html|txt) \z }xms, # Generated by xml2rfc

tests/tap/perl/Test/RRA/Config.pm

@@ -26,7 +26,7 @@ BEGIN {
     @EXPORT_OK = qw(
         $COVERAGE_LEVEL @COVERAGE_SKIP_TESTS @CRITIC_IGNORE $LIBRARY_PATH
         $MINIMUM_VERSION %MINIMUM_VERSION @MODULE_VERSION_IGNORE
-        @POD_COVERAGE_EXCLUDE @STRICT_IGNORE @STRICT_PREREQ
+        @POD_COVERAGE_EXCLUDE @SPDX_IGNORE @STRICT_IGNORE @STRICT_PREREQ
     );
 
     # This version should match the corresponding rra-c-util release, but with
@@ -62,6 +62,7 @@ our $MINIMUM_VERSION = '5.010';
 our %MINIMUM_VERSION;
 our @MODULE_VERSION_IGNORE;
 our @POD_COVERAGE_EXCLUDE;
+our @SPDX_IGNORE;
 our @STRICT_IGNORE;
 our @STRICT_PREREQ;
 
@@ -76,7 +77,7 @@ __END__
 
 =for stopwords
 Allbery rra-c-util Automake perlcritic .libs namespace subdirectory sublicense
-MERCHANTABILITY NONINFRINGEMENT regexes
+MERCHANTABILITY NONINFRINGEMENT regexes SPDX
 
 =head1 NAME
 
@@ -159,6 +160,12 @@ testing.  Normally, all methods have to be documented in the POD for a Perl
 module, but methods matching any of these regexes will be considered private
 and won't require documentation.
 
+=item @SPDX_IGNORE
+
+Regexes that match files that should be excluded from SPDX license header
+checks, in addition to the standard exclusions.  The regular expression is
+matched against the file path relative to the top of the source tree.
+
 =item @STRICT_IGNORE
 
 Additional directories to ignore when doing recursive Test::Strict testing for
@@ -183,7 +190,7 @@ Russ Allbery <[email protected]>
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright 2015-2016, 2019, 2021 Russ Allbery <[email protected]>
+Copyright 2015-2016, 2019, 2021, 2023 Russ Allbery <[email protected]>
 
 Copyright 2013-2014 The Board of Trustees of the Leland Stanford Junior
 University