[ExternalSources] Better robustness :-)

lib/cocoapods/dependency.rb

@@ -204,7 +204,9 @@ def copy_external_source_into_sandbox(sandbox, _)
           output_path = sandbox.root + "Local Podspecs/#{name}.podspec"
           output_path.dirname.mkpath
           puts "-> Fetching podspec for `#{name}' from: #{@params[:podspec]}" unless config.silent?
-          open(Pathname.new(@params[:podspec]).expand_path) do |io|
+          path = @params[:podspec]
+          path = Pathname.new(path).expand_path if path.start_with?("~")
+          open(path) do |io|
             output_path.open('w') { |f| f << io.read }
           end
         end

spec/unit/specification_spec.rb

@@ -471,7 +471,7 @@
   end
 
   it "it returns the expanded local path" do
-    @spec.local_path.should == fixture("integration/JSONKit")
+    @spec.source.should == {:local => fixture("integration/JSONKit")}
   end
 end