Warn instead of throwing an exception when a development pod's podspec specifies…

Warn instead of throwing an exception when a development pod's podspec specifies a license file that does not exist

CHANGELOG.md

@@ -25,6 +25,10 @@ To install release candidates run `[sudo] gem install cocoapods --pre`
 
 ##### Bug Fixes
 
+* Warn instead of throwing an exception when a development pod specifies an invalid license file path  
+  [Eric Amorde](https://github.com/amorde)
+  [#7377](https://github.com/CocoaPods/CocoaPods/issues/7377)
+
 * Better static frameworks transitive dependency error checking  
   [Paul Beusterien](https://github.com/paulb777)
   [#7352](https://github.com/CocoaPods/CocoaPods/issues/7352)

lib/cocoapods/generator/acknowledgements.rb

@@ -73,13 +73,16 @@ module Pod
         return nil unless spec.license
         text = spec.license[:text]
         unless text
-          if license_file = file_accessor(spec).license
-            if license_file.exist?
-              text = IO.read(license_file)
+          if license_file = spec.license[:file]
+            license_path = file_accessor(spec).root + license_file
+            if File.exist?(license_path)
+              text = IO.read(license_path)
             else
               UI.warn "Unable to read the license file `#{license_file}` " \
               "for the spec `#{spec}`"
             end
+          elsif license_file = file_accessor(spec).license
+            text = IO.read(license_file)
           end
         end
         text

lib/cocoapods/sandbox/file_accessor.rb

@@ -278,11 +278,7 @@ module Pod
       #         specification or auto-detected.
       #
       def license
-        if file = spec_consumer.license[:file]
-          path_list.root + file
-        else
-          path_list.glob([GLOB_PATTERNS[:license]]).first
-        end
+        spec_license || path_list.glob([GLOB_PATTERNS[:license]]).first
       end
 
       # @return [Pathname, Nil] The path of the custom module map file of the
@@ -305,17 +301,37 @@ module Pod
         path_list.glob([GLOB_PATTERNS[:docs]])
       end
 
+      # @return [Pathname] The path of the license file specified in the
+      #         specification, if it exists
+      #
+      def spec_license
+        if file = spec_consumer.license[:file]
+          absolute_path = root + file
+          absolute_path if File.exist?(absolute_path)
+        end
+      end
+
       # @return [Array<Pathname>] Paths to include for local pods to assist in development
       #
       def developer_files
         podspecs = specs
         result = [module_map, prefix_header]
+
+        if license_path = spec_consumer.license[:file]
+          license_path = root + license_path
+          unless File.exist?(license_path)
+            UI.warn "A license was specified in podspec `#{spec.name}` but the file does not exist - #{license_path}"
+          end
+        end
+
         if podspecs.size <= 1
           result += [license, readme, podspecs, docs]
         else
+          # Manually add non-globbing files since there are multiple podspecs in the same folder
           result << podspec_file
-          if file = spec_consumer.license[:file]
-            result << root + file
+          if license_file = spec_license
+            absolute_path = root + license_file
+            result << absolute_path if File.exist?(absolute_path)
           end
         end
         result.compact.flatten.sort

spec/unit/sandbox/file_accessor_spec.rb

@@ -211,6 +211,24 @@ module Pod
         @accessor.license.should == @root + 'LICENSE'
       end
 
+      describe '#spec_license' do
+        it 'returns the license file of the specification' do
+          @accessor.spec_license.should == @root + 'LICENSE'
+        end
+
+        it 'does not auto-detect the license' do
+          FileUtils.cp(@root + 'LICENSE', @root + 'LICENSE_TEMP')
+          @spec_consumer.stubs(:license).returns({})
+          @accessor.spec_license.should.be.nil
+          FileUtils.rm_f(@root + 'LICENSE_TEMP')
+        end
+
+        it 'returns nil if the license file path does not exist' do
+          @spec_consumer.stubs(:license).returns(:file => 'MISSING_PATH')
+          @accessor.spec_license.should.be.nil
+        end
+      end
+
       it 'returns the docs of the specification' do
         @accessor.docs.should == [
           @root + 'docs/guide1.md',
@@ -241,6 +259,20 @@ module Pod
         ]
       end
 
+      it 'warns when a LICENSE file is specified but the path does not exist' do
+        @spec_consumer.stubs(:license).returns(:file => 'PathThatDoesNotExist/LICENSE')
+        @accessor.developer_files.should == [
+          @root + 'Banana.modulemap',
+          @root + 'BananaLib.podspec',
+          @root + 'Classes/BananaLib.pch',
+          @root + 'LICENSE', # Found by globbing
+          @root + 'README',
+          @root + 'docs/guide1.md',
+          @root + 'docs/subdir/guide2.md',
+        ]
+        UI.warnings.should.include "A license was specified in podspec `#{@spec_consumer.name}` but the file does not exist - #{@accessor.root + 'PathThatDoesNotExist/LICENSE'}\n"
+      end
+
       it 'does not return auto-detected developer files when there are multiple podspecs' do
         @accessor.stubs(:specs).returns([@root + 'BananaLib.podspec', @root + 'OtherLib.podspec'])
         @accessor.developer_files.should == [