internal/outcome: integrate pipewire server

This is very simple and takes almost no inputs. This is not yet hooked up to anything to prevent breaking any existing behaviour.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/outcome/sppipewire.go

@@ -0,0 +1,31 @@
+package outcome
+
+import (
+	"encoding/gob"
+
+	"hakurei.app/hst"
+	"hakurei.app/internal/pipewire"
+)
+
+func init() { gob.Register(spPipeWireOp{}) }
+
+// spPipeWireOp exports the PipeWire server to the container via SecurityContext.
+// Runs after spRuntimeOp.
+type spPipeWireOp struct{}
+
+func (s spPipeWireOp) toSystem(state *outcomeStateSys) error {
+	if state.et&hst.EPipeWire == 0 {
+		return errNotEnabled
+	}
+
+	state.sys.PipeWire(state.instance().Append("pipewire"))
+	return nil
+}
+
+func (s spPipeWireOp) toContainer(state *outcomeStateParams) error {
+	innerPath := state.runtimeDir.Append(pipewire.PW_DEFAULT_REMOTE)
+	state.env[pipewire.Remote] = innerPath.String()
+	state.params.Bind(state.instancePath().Append("pipewire"), innerPath, 0)
+
+	return nil
+}