Fix: Could not launch a VM without building it locally (#588)

This tests that a VM from the aleph.im network can be downloaded and launched.

Co-authored-by: ajin <ajin@Aleph.ajin.virtualbox.org>

tests/supervisor/test_execution.py

@@ -55,3 +55,41 @@ async def test_create_execution():
 
     await execution.start()
     await execution.stop()
+
+
+@pytest.mark.asyncio
+async def test_create_execution_online():
+    """
+    Create a new VM execution without building it locally and check that it starts properly.
+    """
+
+    # Ensure that the settings are correct and required files present.
+    settings.setup()
+    settings.check()
+
+    # The database is required for the metrics and is currently not optional.
+    engine = metrics.setup_engine()
+    await metrics.create_tables(engine)
+
+    vm_hash = ItemHash("3fc0aa9569da840c43e7bd2033c3c580abb46b007527d6d20f2d4e98e867f7af")
+    message = await get_message(ref=vm_hash)
+
+    execution = VmExecution(
+        vm_hash=vm_hash,
+        message=message.content,
+        original=message.content,
+        snapshot_manager=None,
+        systemd_manager=None,
+        persistent=False,
+    )
+
+    # Downloading the resources required may take some time, limit it to 10 seconds
+    await asyncio.wait_for(execution.prepare(), timeout=30)
+
+    vm = execution.create(vm_id=3, tap_interface=None)
+    # Test that the VM is created correctly. It is not started yet.
+    assert isinstance(vm, AlephFirecrackerProgram)
+    assert vm.vm_id == 3
+
+    await execution.start()
+    await execution.stop()