.

wcfs/internal/xbtree/δbtail.go

@@ -221,12 +221,13 @@ func (btail *ΔTail) Update(δZ *zodb.EventCommit) ΔB {
 		}
 	}
 
+	δB := ΔB{Rev: δZ.Tid, Change: make(map[*Tree]map[Key]Value)}
+
 	if len(δZByRoot) == 0 {
-		return nil // tracked set not changed
+		return δB // tracked set not changed
 	}
 
 	// XXX stub to get file.size invalidation working
-	δB := ΔB{Rev: δZ.Tid, Change: make(map[*Tree]map[Key]Value)}
 	for root := range δZByRoot {
 		δt, ok := δB.Change[root]
 		if !ok {

wcfs/δftail.go

@@ -100,7 +100,7 @@ func (δFtail *ΔFTail) Update(δZ *zodb.EventCommit) ΔF {
 				δfile = make(SetI64)
 				δF.Change[file] = δfile
 			}
-			for blk /*, zblk*/ := range δt.KV {
+			for blk /*, zblk*/ := range δt {
 				// FIXME stub - need to take both keys and zblk changes into account
 				// XXX document, and in particular how to include atTail
 				δfile.Add(blk)