Fix parallelism

drive-demuxer.go

@@ -298,33 +298,33 @@ func (s *Step) Walk() {
 		rightState, err := s.CheckState(rightPath)
 		if err != nil {
 			wg.Add(1)
-			go func() {
+			go func(rightPath string) {
 				defer func() {
 					wg.Done()
 				}()
 				log.Printf("Error statting path %s: %s\n", rightPath, err)
 				s.Bar.Increment()
-			}()
+			}(rightPath)
 			continue
 		} else if rightState == UNKNOWN {
 			wg.Add(1)
-			go func() {
+			go func(rightPath string) {
 				defer func() {
 					wg.Done()
 				}()
 				log.Printf("Unknown stat value for path %s\n", rightPath)
 				s.Bar.Increment()
-			}()
+			}(rightPath)
 			continue
 		} else if rightState == MISSING {
 			wg.Add(1)
-			go func() {
+			go func(child string) {
 				defer func() {
 					wg.Done()
 				}()
 				s.SeparateLeft(child)
 				s.Bar.Increment()
-			}()
+			}(child)
 			continue
 		}
 
@@ -332,40 +332,40 @@ func (s *Step) Walk() {
 		leftState, err := s.CheckState(leftPath)
 		if err != nil {
 			wg.Add(1)
-			go func() {
+			go func(leftPath string) {
 				defer func() {
 					wg.Done()
 				}()
 				log.Printf("Error statting path %s: %s\n", leftPath, err)
 				s.Bar.Increment()
-			}()
+			}(leftPath)
 			continue
 		} else if leftState == UNKNOWN {
 			wg.Add(1)
-			go func() {
+			go func(leftPath string) {
 				defer func() {
 					wg.Done()
 				}()
 				log.Printf("Unknown stat value for path %s\n", leftPath)
 				s.Bar.Increment()
-			}()
+			}(leftPath)
 			continue
 		} else if leftState == MISSING {
 			wg.Add(1)
-			go func() {
+			go func(child string) {
 				defer func() {
 					wg.Done()
 				}()
 				s.SeparateRight(child)
 				s.Bar.Increment()
-			}()
+			}(child)
 			continue
 		}
 
 		switch rightState {
 		case FILE:
 			wg.Add(1)
-			go func() {
+			go func(child string) {
 				defer func() {
 					wg.Done()
 				}()
@@ -376,26 +376,32 @@ func (s *Step) Walk() {
 					s.Separate(child)
 					s.Bar.Increment()
 				}
-			}()
+			}(child)
 		case DIRECTORY:
 			if leftState == DIRECTORY {
-				s.MakeCombinedDir(child)
 				substep := Step{
 					TopLevel: s.TopLevel,
 					Subpath:  path.Join(s.Subpath, child),
 				}
 				wg.Add(1)
-				go func() {
+				go func(child string, substep *Step) {
 					defer func() {
 						wg.Done()
 					}()
+					s.MakeCombinedDir(child)
 					substep.Walk()
 					s.RemoveInputDirs(child)
 					s.Bar.Increment()
-				}()
+				}(child, &substep)
 			} else {
+				wg.Add(1)
+				go func(child string) {
+					defer func() {
+						wg.Done()
+					}()
 					s.Separate(child)
 					s.Bar.Increment()
+				}(child)
 			}
 		default:
 			panic("Unexpected state")