.

wcfs/internal/xbtree/xbtreetest/treegen.py

@@ -109,7 +109,11 @@ session example:
     # ----
 
 
-XXX ΔFtail support
+ΔFtail support
+--------------
+
+XXX
+
 
 --------
 
@@ -202,6 +206,7 @@ def TreesSrv(zstor, r):
     ztree = zctx.root['treegen/tree'] = LOBTree()
     zfile = zctx.root['treegen/file'] = ZBigFile(blksize=4) # for ΔFtail tests
     zfile.blktab = ztree
+    zdummy = zctx.root['treegen/dummy'] = PersistentMapping() # anything for ._p_changed=True
     head = commit('treegen/tree: init')
     xprint("tree.srv start @%s root=%s" % (ashex(head), ashex(ztree._p_oid)))
     treetxtPrev = zctx.ztreetxt(ztree)
@@ -243,16 +248,17 @@ def TreesSrv(zstor, r):
                     elif v2 is None:
                         del valdict[k]
 
+            zdummy._p_changed = True # alayws non-empty commit
             head = commit(subj)
             xprint("%s" % ashex(head))
             continue
 
         # everything else is considerd to be a tree topology
 
-        # mark tree as changed if the same topology is requested twice.
+        # mark something as changed if the same topology is requested twice.
         # this ensures we can actually make a non-empty commit
         if treetxt == treetxtPrev:
-            ztree._p_changed = True
+            zdummy._p_changed = True
         treetxtPrev = treetxt
 
         tree = zctx.TopoDecode(treetxt)