Recognize 'UNLICENSE' license files

changelogs/unreleased/47440-recognize-unlicense-license-file.yml

+---
+title: Recognize 'UNLICENSE' license files
+merge_request: 21508
+author: J.D. Bean
+type: added

lib/gitlab/file_detector.rb

@@ -8,7 +8,7 @@ module Gitlab
       # Project files
       readme: %r{\Areadme[^/]*\z}i,
       changelog: %r{\A(changelog|history|changes|news)[^/]*\z}i,
-      license: %r{\A(licen[sc]e|copying)(\.[^/]+)?\z}i,
+      license: %r{\A((un)?licen[sc]e|copying)(\.[^/]+)?\z}i,
       contributing: %r{\Acontributing[^/]*\z}i,
       version: 'version',
       avatar: /\Alogo\.(png|jpg|gif)\z/,

spec/lib/gitlab/file_detector_spec.rb

@@ -29,11 +29,15 @@ describe Gitlab::FileDetector do
     end
     it 'returns the type of a license file' do
-      %w(LICENSE LICENCE COPYING).each do |file|
+      %w(LICENSE LICENCE COPYING UNLICENSE UNLICENCE).each do |file|
         expect(described_class.type_of(file)).to eq(:license)
       end
     end
+    it 'returns nil for an UNCOPYING file' do
+      expect(described_class.type_of('UNCOPYING')).to be_nil
+    end
+
     it 'returns the type of a version file' do
       expect(described_class.type_of('VERSION')).to eq(:version)
     end