few improvements:

- use iodaemon pid as well as the process pid in the log file name
- cleanup iodaemon and strace logs on successfull exit of iodaemon
- make sure we receive a line with "ready" when we are waiting for "ready"

iodaemon/iodaemon.go

@@ -36,8 +36,10 @@ func Spawn(
 		return err
 	}
 
+	currentPid := os.Getpid()
 	pid := strings.Split(filepath.Base(socketPath), ".")[0]
-	logFile, err = os.OpenFile(filepath.Join(filepath.Dir(socketPath), fmt.Sprintf(pid+".iodaemon")), os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
+	logFilePath := filepath.Join(filepath.Dir(socketPath), fmt.Sprintf("%s.%d.iodaemon", pid, currentPid))
+	logFile, err = os.OpenFile(logFilePath, os.O_CREATE|os.O_APPEND|os.O_RDWR, 0644)
 	if err != nil {
 		panic(err)
 	}
@@ -105,6 +107,8 @@ func Spawn(
 			exit = byte(ws.ExitStatus())
 		}
 
+		logFile.Close()
+		os.Remove(logFilePath)
 		fmt.Fprintf(statusW, "%d\n", exit)
 	case <-time.After(timeout):
 		contents, err := ioutil.ReadFile("/proc/net/unix")
@@ -115,7 +119,7 @@ func Spawn(
 		}
 
 		fmt.Fprintf(logFile, "output of netstat -xap: \n")
-		cmd := exec.Command("netstat", "-xap")
+		cmd := exec.Command("/bin/netstat", "-xap")
 		cmd.Stdout = logFile
 		cmd.Stderr = logFile
 		if err := cmd.Run(); err != nil {

process_tracker/process.go

@@ -179,20 +179,6 @@ func (p *Process) Spawn(cmd *exec.Cmd, tty *garden.TTYSpec) (ready, active chan
 	}
 
 	go func() {
-		_, err := spawnOut.ReadBytes('\n')
-		if err != nil {
-			stderrContents, readErr := ioutil.ReadAll(spawnErr)
-			if readErr != nil {
-				ready <- fmt.Errorf("failed to read ready (%s), and failed to read the stderr: %s", err, readErr)
-				return
-			}
-
-			ready <- fmt.Errorf("failed to read ready (%s): %s", err, string(stderrContents))
-			return
-		}
-
-		ready <- nil
-
 		waitFor := func(expectedLog string) error {
 			p.logger.Info("waiting for " + expectedLog)
 			log, err := spawnOut.ReadBytes('\n')
@@ -221,6 +207,12 @@ func (p *Process) Spawn(cmd *exec.Cmd, tty *garden.TTYSpec) (ready, active chan
 			return nil
 		}
 
+		if waitFor("ready") != nil {
+			return
+		}
+
+		ready <- nil
+
 		if waitFor("listener-accepted") != nil {
 			return
 		}
@@ -247,6 +239,8 @@ func (p *Process) Spawn(cmd *exec.Cmd, tty *garden.TTYSpec) (ready, active chan
 		active <- nil
 
 		spawn.Wait()
+
+		os.Remove(straceOutput)
 	}()
 
 	return