rsync.rb in nanoc3-3.1.4

- old
+ new

@@ -104,9 +104,10 @@
     end
 
     # Runs the given shell command. This is a simple wrapper around Kernel#system.
     def run_shell_cmd(args)
       system(*args)
+      raise "command exited with a nonzero status code #{$?.exitstatus} (command: #{args.join(' ')})" if !$?.success?
     end
 
   end
 
 end