container: start daemons within container

This is useful for daemons internal to the container. The only current use case is pipewire-pulse.

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

container/dispatcher.go

@@ -68,6 +68,8 @@ type syscallDispatcher interface {
 	notify(c chan<- os.Signal, sig ...os.Signal)
 	// start starts [os/exec.Cmd].
 	start(c *exec.Cmd) error
+	// wait waits on [os/exec.Cmd].
+	wait(c *exec.Cmd) error
 	// signal signals the underlying process of [os/exec.Cmd].
 	signal(c *exec.Cmd, sig os.Signal) error
 	// evalSymlinks provides [filepath.EvalSymlinks].
@@ -170,6 +172,7 @@ func (direct) seccompLoad(rules []std.NativeRule, flags seccomp.ExportFlag) erro
 }
 func (direct) notify(c chan<- os.Signal, sig ...os.Signal) { signal.Notify(c, sig...) }
 func (direct) start(c *exec.Cmd) error                     { return c.Start() }
+func (direct) wait(c *exec.Cmd) error                      { return c.Wait() }
 func (direct) signal(c *exec.Cmd, sig os.Signal) error     { return c.Process.Signal(sig) }
 func (direct) evalSymlinks(path string) (string, error)    { return filepath.EvalSymlinks(path) }