Re: [Qemu-block] [Qemu-devel] [PATCH for-2.8] iotests: Do not rely on unavailable domains in 162

[Sascha Silbe]

Dear Max,

Max Reitz <address@hidden> writes:

[tests/qemu-iotests/162]
[...]
> +# (We need to set up a server here, because the error message for "Connection
> +#  refused" does not contain the destination port)
> +$QEMU_NBD -p 42424 -f raw null-co:// &
> +sleep 0.5
> +$QEMU_IMG info 'json:{"driver": "nbd", "host": "localhost", "port": 42424}' \
> +    | grep '^image'

Using a fixed port number means multiple users won't be able to run this
in parallel. That it's only open for a short time actually makes the
issue a bit worse as it's hard to understand just why the test failed
intermittently.

Is there a way to have qemu-nbd use a random port and print the port
number?

Sascha
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