DaanHoogland commented on code in PR #10503:
URL: https://github.com/apache/cloudstack/pull/10503#discussion_r2069908667


##########
api/src/main/java/org/apache/cloudstack/api/command/user/vm/DeployVMCmd.java:
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@@ -816,6 +836,9 @@ public void execute() {
 
     @Override
     public void create() throws ResourceAllocationException {
+        if (!isVolumeOrSnapshotProvided() && templateId == null) {
+            throw new CloudRuntimeException("There isn't a ROOT volume, 
snapshot of ROOT volume or template provided to deploy a Virtual machine");
+        }

Review Comment:
   maybe good to extract a validate method and also check for double 
parameters; i.e. it is ambiguous if two or all three of the parameters are 
given.



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