retry when creating dir failed

agent.py

@@ -299,13 +299,20 @@ class MyHandler(BaseHTTPRequestHandler):
 			token = generate_token(16)
 
 			if len(dfs_src) > 0:
+				failed_cnt = 0
+				while True:
+					failed_cnt += 1
+					if failed_cnt > 3:
+						break
 					try:
 						# Docker wouldn't create dir by default on bind mode,
 						# see https://github.com/moby/moby/issues/13121
 						path = Path(dfs_src)
 						path.mkdir(parents=True, exist_ok=True)
+						break
 					except OSError as e:
 						print("Creation of the directory %s failed" % dfs_src)
+						print(e)
 						print(traceback.format_exc())
 
 			try: