optimize log: move WriteJSON defer as early as possible

if function returns error before WriteJSON defer, error will not be
printed out, so move this defer as early as possible and use logrus to
print out error if returns before it.

Signed-off-by: xiadanni <[email protected]>

Author: Vanient

libcontainer/factory_linux.go

@@ -22,6 +22,7 @@ import (
 	"github.com/opencontainers/runc/libcontainer/configs/validate"
 	"github.com/opencontainers/runc/libcontainer/intelrdt"
 	"github.com/opencontainers/runc/libcontainer/utils"
+	"github.com/sirupsen/logrus"
 )
 
 const (
@@ -346,11 +347,26 @@ func (l *LinuxFactory) StartInitialization() (err error) {
 	envInitPipe := os.Getenv("_LIBCONTAINER_INITPIPE")
 	pipefd, err := strconv.Atoi(envInitPipe)
 	if err != nil {
-		return fmt.Errorf("unable to convert _LIBCONTAINER_INITPIPE: %w", err)
+		err = fmt.Errorf("unable to convert _LIBCONTAINER_INITPIPE: %w", err)
+		logrus.Error(err)
+		return err
 	}
 	pipe := os.NewFile(uintptr(pipefd), "pipe")
 	defer pipe.Close()
 
+	defer func() {
+		// We have an error during the initialization of the container's init,
+		// send it back to the parent process in the form of an initError.
+		if werr := utils.WriteJSON(pipe, syncT{procError}); werr != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+		if werr := utils.WriteJSON(pipe, &initError{Message: err.Error()}); werr != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+	}()
+
 	// Only init processes have FIFOFD.
 	fifofd := -1
 	envInitType := os.Getenv("_LIBCONTAINER_INITTYPE")
@@ -382,18 +398,6 @@ func (l *LinuxFactory) StartInitialization() (err error) {
 	// specific env vars.
 	os.Clearenv()
 
-	defer func() {
-		// We have an error during the initialization of the container's init,
-		// send it back to the parent process in the form of an initError.
-		if werr := utils.WriteJSON(pipe, syncT{procError}); werr != nil {
-			fmt.Fprintln(os.Stderr, err)
-			return
-		}
-		if werr := utils.WriteJSON(pipe, &initError{Message: err.Error()}); werr != nil {
-			fmt.Fprintln(os.Stderr, err)
-			return
-		}
-	}()
 	defer func() {
 		if e := recover(); e != nil {
 			err = fmt.Errorf("panic from initialization: %w, %v", e, string(debug.Stack()))