Include roots.pem with Ruby package

grpc.gemspec

@@ -17,6 +17,7 @@ Gem::Specification.new do |s|
   s.requirements << 'libgrpc ~> 0.11.0 needs to be installed'
 
   s.files = %w( Rakefile Makefile )
+  s.files += %w( etc/roots.pem )
   s.files += Dir.glob('src/ruby/bin/**/*')
   s.files += Dir.glob('src/ruby/ext/**/*')
   s.files += Dir.glob('src/ruby/lib/**/*')

src/ruby/lib/grpc.rb

@@ -27,6 +27,11 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+ssl_roots_path = File.expand_path('../../../etc/roots.pem', __FILE__)
+unless ENV['GRPC_DEFAULT_SSL_ROOTS_FILE_PATH']
+  ENV['GRPC_DEFAULT_SSL_ROOTS_FILE_PATH'] = ssl_roots_path
+end
+
 require 'grpc/errors'
 require 'grpc/grpc'
 require 'grpc/logconfig'