.

wcfs/wcfs.go

@@ -123,6 +123,7 @@
 // changes:
 //
 //	S: <2·k> pin <bigfileX> #<blk> @<rev_max>
+//	XXX @head means unpin.
 //
 // and waits until all clients confirm that changed file block can be updated
 // in global OS cache.

wcfs/wcfs_test.py

@@ -720,7 +720,8 @@ def watch(w, zf, at):   # XXX -> ?
 def _expectPin(w, ctx, zf, expect):
     expected = set()    # of expected pin messages
     for blk, at in expect.items():
-        msg = b"pin %s #%d @%s" % (h(zf._p_oid), blk, h(at))
+        hat = h(at) if at is not None else 'head'
+        msg = b"pin %s #%d @%s" % (h(zf._p_oid), blk, hat)
         assert msg not in expected
         expected.add(msg)