Pass Errno::ENOENT message to local exception

lib/cocaine/command_line.rb

@@ -74,8 +74,8 @@ def run(interpolations = {})
         full_command = command(interpolations)
         log("#{colored("Command")} :: #{full_command}")
         output = execute(full_command)
-      rescue Errno::ENOENT
-        raise Cocaine::CommandNotFoundError
+      rescue Errno::ENOENT => e
+        raise Cocaine::CommandNotFoundError, e.message
       ensure
         @exit_status = $?.exitstatus if $?.respond_to?(:exitstatus)
       end

spec/cocaine/command_line_spec.rb

@@ -312,5 +312,16 @@
       cmd.runner.class.should eq Cocaine::CommandLine::FakeRunner
     end
 
+    it 'passes error message to exception when command is failed with Errono::ENOENT' do
+      cmd = Cocaine::CommandLine.new('test command', '')
+      cmd.stubs(:execute).with('test command') do
+        raise Errno::ENOENT, 'fail message'
+      end
+      begin
+        cmd.run
+      rescue Cocaine::CommandNotFoundError => e
+        expect(e.message).to eq 'No such file or directory - fail message'
+      end
+    end
   end
 end