# WirePlumber, trimmed to what a microVM with no sound card actually needs.
#
# The goal is that `neswire` is the *only* Audio/Sink in the graph, so
# default-node selection has exactly one candidate and cannot pick wrong.
#
# The "Dummy Output" (`auto_null`) sink is not disabled here, and no longer
# needs to be: it came from pipewire-pulse's `module-always-sink`, and
# pipewire-pulse is no longer installed. WirePlumber ships
# scripts/fallback-sink.lua, which creates a node by the same name, but no
# component in wireplumber.conf references it, so it never loads. If auto_null
# ever comes back, it came back with pipewire-pulse -- the switch is
# `pulse.cmd.always-sink = false` in a pipewire-pulse.conf.d drop-in, not
# anything on this side.
#
# pipewire.conf's Dummy-Driver / Freewheel-Driver are a third thing again:
# support.node.driver objects with no ports -- drivers, not sinks, so nothing
# can play into them. Dummy-Driver is load-bearing here. With no ALSA hardware
# it is what clocks the graph, and therefore what paces neswire's sink. Do not
# disable it.

wireplumber.profiles = {
  main = {
    # No sound card, no bluetooth adapter, no camera. These only exist to
    # probe hardware this guest does not have; disabling them removes the
    # only other source of sinks besides neswire.
    hardware.audio = disabled
    hardware.bluetooth = disabled
    hardware.video-capture = disabled

    # The guest root is read-only and every VM is built from the same image, so
    # there is nothing to restore and nowhere to save. Left enabled, a stale
    # state file is a second, invisible place that can pin a default sink --
    # the exact failure this file exists to rule out.
    #
    # Equivalent to inheriting mixin.stateless, spelled out so it is greppable.
    hooks.default-nodes.state = disabled
    hooks.device.profile.state = disabled
    hooks.device.routes.state = disabled
    hooks.stream.state = disabled
  }
}