revid: remove cmd field from revid struct

revid/revid.go

@@ -33,7 +33,6 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"os/exec"
 	"strconv"
 	"strings"
 	"sync"
@@ -91,12 +90,6 @@ type Revid struct {
 	// in Revid.Stop().
 	closeInput func() error
 
-	// cmd is the exec'd process that may be used to produce
-	// the input stream.
-	// FIXME(kortschak): This should not exist. Replace this
-	// with a context.Context cancellation.
-	cmd *exec.Cmd
-
 	// lexTo, encoder and packer handle transcoding the input stream.
 	lexTo func(dest io.Writer, src io.Reader, delay time.Duration) error
 
@@ -481,10 +474,6 @@ func (r *Revid) Stop() {
 
 	r.cfg.Logger.Log(logger.Info, pkg+"closed pipeline")
 
-	if r.cmd != nil && r.cmd.Process != nil {
-		r.cfg.Logger.Log(logger.Info, pkg+"killing input proccess")
-		r.cmd.Process.Kill()
-	}
 	r.cfg.Logger.Log(logger.Info, pkg+"waiting for routines to close")
 
 	r.wg.Wait()