fix bug linkpath exists

cmd/dtk-cdi-hook/create-symlinks/create-symlinks.go

@@ -97,6 +97,14 @@ func (m command) run(c *cli.Context, cfg *config) error {
 	return nil
 }
 
+func DirExists(path string) bool {
+        _, err := os.Stat(path)
+        if os.IsNotExist(err){
+            return false
+        }
+        return err == nil
+}
+
 func (m command) createLink(created map[string]bool, hostRoot string, containerRoot string, target string, link string) error {
 	linkPath, err := changeRoot(hostRoot, containerRoot, link)
 	if err != nil {
@@ -113,6 +121,10 @@ func (m command) createLink(created map[string]bool, hostRoot string, containerR
 	}
 
 	m.logger.Infof("Symlinking %v to %v", linkPath, targetPath)
+        if DirExists(linkPath) {
+           os.RemoveAll(linkPath)
+           m.logger.Infof("remove dir %v", linkPath)
+        }
 	err = os.MkdirAll(filepath.Dir(linkPath), 0755)
 	if err != nil {
 		return fmt.Errorf("failed to create directory: %v", err)