allow ucloud-api to also be able work without ceph i.e use filesystem

main.py

@@ -4,12 +4,14 @@
 
 import json
 import subprocess
+import os
 
 from flask import Flask, request
 from flask_restful import Resource, Api
 from uuid import uuid4
 from os.path import join
 from config import etcd_client as client
+from config import WITHOUT_CEPH, logging
 
 from ucloud_common.vm import VmPool, VMStatus
 from ucloud_common.host import HostPool
@@ -123,15 +125,23 @@ class VMAction(Resource):
             if action == "delete" and vm_entry.hostname == "":
                 try:
                     path_without_protocol = vm_entry.path[vm_entry.path.find(":")+1:]
-                    rc = subprocess.call(f"rbd rm {path_without_protocol}".split(" "))
-                except FileNotFoundError:
-                    return {"message": "VM image does not exists"}
-                else:
-                    if rc == 0:
+
+                    if WITHOUT_CEPH:
+                        command_to_delete = ["rm", os.path.join("/var/vm", vm_entry.uuid)]
+                    else:
+                        command_to_delete = ["rbd", "rm", path_without_protocol]
+
+                    subprocess.check_output(command_to_delete, stderr=subprocess.PIPE)
+                except subprocess.CalledProcessError as e:
+                    if "No such file" in e.stderr.decode("utf-8"):
                         client.client.delete(vm_entry.key)
                         return {"message": "VM successfully deleted"}
                     else:
+                        logging.exception(e)
                         return {"message": "Some error occurred while deleting VM"}
+                else:
+                    client.client.delete(vm_entry.key)
+                    return {"message": "VM successfully deleted"}
 
             r = RequestEntry.from_scratch(type=f"{action.title()}VM",
                                           uuid=data['uuid'],