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That wouldn't be a mode, just a provider. For example, Equinix Metal already has a provider.

Anything that exposes an API should be manageable.

I suppose a consideration in implementing something like an "apt" provider, would be: would you need a new Pulumi provider configuration for each machine? Probably.

Right, bare metal cloud services are already supported, but I'm talking about configuring things on a specific machine, e.g. creating config files. So there wouldn't be an API, as such...

There would be a provider doing the work, which is essentially an API. A big difficulty would be that in other providers, you log in using one set of creds then configuring any number of resources. For configuring machines, you'd need new creds for each machine, so essentially a different provider for each machine.

But the pattern exists. The MySQL, PostrgeSQL, RabbitMQ and similar providers work roughly that way.