check whether vm image exists before running it

main.py

@@ -33,6 +33,20 @@ class VM:
     vm: qmp.QEMUMachine
 
 
+class RBD(object):
+    @staticmethod
+    def ls(pool):
+        output = ""
+        try:
+            output = subprocess.check_output(
+                ["rbd", "ls", pool], stderr=subprocess.PIPE
+            ).decode("utf-8").strip()
+        except subprocess.CalledProcessError as e:
+            raise Exception(e.stderr)
+        return output.split("\n")
+
+
+
 logging.basicConfig(
     level=logging.DEBUG,
     filename="log.txt",
@@ -99,12 +113,13 @@ def start_vm(vm_path, e):
     #        uservms pool then checkwhether the e.key.split("/").pop()
     #        exists in rbd_ls(uservms_pool)
 
-    # if not os.path.isfile(vm_path):
-    #     logging.info(f"Image file of vm {e.key} does not exists")
-    #     logging.info(f"Setting vm {e.key} status to DELETED")
-    #     e.value["status"] = "DELETED"
-    #     client.put(e.key, json.dumps(e.value))
-    #     return
+    if not vm_path.split("/")[-1] in RBD.ls("uservms")
+        logging.info(f"Image file of vm {e.key} does not exists")
+        logging.info(f"Setting vm {e.key} status to DELETED")
+        e.value["status"] = "DELETED"
+        client.put(e.key, json.dumps(e.value))
+        return
+
 
     _vm = get_vm(running_vms, e.key)
     if _vm: