treewide: include PipeWire op and enforce PulseAudio check

This fully replaces PulseAudio with PipeWire and enforces the PulseAudio check and error message. The pipewire-pulse daemon is handled in the NixOS module.

Closes #26.

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

cmd/hakurei/command.go

@@ -14,6 +14,7 @@ import (
 	_ "unsafe" // for go:linkname
 
 	"hakurei.app/command"
+	"hakurei.app/container"
 	"hakurei.app/container/check"
 	"hakurei.app/container/fhs"
 	"hakurei.app/hst"
@@ -149,9 +150,6 @@ func buildCommand(ctx context.Context, msg message.Msg, early *earlyHardeningErr
 			if flagPipeWire || flagPulse {
 				et |= hst.EPipeWire
 			}
-			if flagPulse {
-				et |= hst.EPulse
-			}
 
 			config := &hst.Config{
 				ID:          flagID,
@@ -189,6 +187,14 @@ func buildCommand(ctx context.Context, msg message.Msg, early *earlyHardeningErr
 				}})
 			}
 
+			// start pipewire-pulse: this most likely exists on host if PipeWire is available
+			if flagPulse {
+				config.Container.Filesystem = append(config.Container.Filesystem, hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSDaemon{
+					Target: fhs.AbsRunUser.Append(strconv.Itoa(container.OverflowUid(msg)), "pulse/native"),
+					Exec:   shell, Args: []string{"-lc", "pipewire-pulse"},
+				}})
+			}
+
 			config.Container.Filesystem = append(config.Container.Filesystem,
 				// opportunistically bind kvm
 				hst.FilesystemConfigJSON{FilesystemConfig: &hst.FSBind{