clone: put streaming clones in a transaction

Streaming clones were writing to files outside of a transaction. Soon the
fncache will be written at transaction close time, so we need streaming clones
to be in a transaction.

mercurial/localrepo.py

@@ -2021,6 +2021,9 b' class localrepository(object):'
             handled_bytes = 0
             self.ui.progress(_('clone'), 0, total=total_bytes)
             start = time.time()
+
+            tr = self.transaction(_('clone'))
+            try:
             for i in xrange(total_files):
                 # XXX doesn't support '\n' or '\r' in filenames
                 l = fp.readline()
@@ -2041,6 +2044,13 b' class localrepository(object):'
                                      total=total_bytes)
                     ofp.write(chunk)
                 ofp.close()
+                tr.close()
+            finally:
+                tr.release()
+
+            # Writing straight to files circumvented the inmemory caches
+            self.invalidate()
+
             elapsed = time.time() - start
             if elapsed <= 0:
                 elapsed = 0.001