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Digging into the code a bit I see it just is starting a subprocess which makes sense now why it is terminating on the sigterm/ctrl+c (signal it sent to whole process tree)
<https://github.com/pulumi/pulumi/blob/master/sdk/python/lib/pulumi/automation/_cmd.py#L55>
It seems like this could be enhanced to deal with a cancelation/async run that way it can be gracefully stopped rather than abruptly terminated.

It would be great if you could open an issue with these suggestions via <http://github.com/pulumi/pulumi/issues/new|github.com/pulumi/pulumi/issues/new>

logged the issue here <https://github.com/pulumi/pulumi/issues/9103>