.

wcfs/wcfs.go

@@ -1178,7 +1178,7 @@ func (f *BigFile) updateWatchers(ctx context.Context, blk int64, treepath []btre
 		return
 	}
 
-	fmt.Printf("S: read -> update watchers (#%d)\n", len(f.watches))
+	fmt.Printf("S: read #%d -> update watchers (#%d)\n", blk, len(f.watches))
 
 	// update δFtail index
 	bfdir := f.head.bfdir

wcfs/wcfs_test.py

@@ -540,7 +540,7 @@ class tFile:
         shouldPin = False   # whether at least one wlink should receive a pin
 
         # watches must be notified if access goes to @head/file; not if to @rev/file.   XXX text
-        wpin = {}   # tWatchLink -> (zf, pinok)
+        wpin = {}   # tWatchLink -> pinok
         for wlink in t.tdb._wlinks:
             pinok = {}
             if t.at is None: # @head/...
@@ -1190,10 +1190,16 @@ def test_wcfs():
     f.assertCache([1,1,0,1,0,0])                # FIXME a must be invalidated - see δbtree ^^^
 
     f.assertBlk(2, '4c', {wl: {2: at3}})
-    f.assertBlk(5, '4f', {wl: {5: at0}})    # XXX at0 -> ø
+    print('000')
+    # blk4 is hole @head - the same as at earlier db view   XXX or do not allow hole past .size ?
+    f.assertBlk(4, '',   {wl: {}})
+    print('AAA')
+    f.assertBlk(5, '4f', {wl: {5: at0}})    # XXX at0 -> ø  XXX also triggers access to #4 ?
     # XXX 0, {0, at3} after δbtree works
+    print('BBB')
 
     wl.close()
+    print('CCC')
 
 
     # XXX commit after current file size -> watch