changeset 33706:01a1c4e66816

repo: skip invalidation of changelog if it has 'delayed' changes (API)

The changelog object can store recently added revisions in memory
until the transaction is committed. We don't want to lose those
changes even if repo.invalidate(clearfilecache=True), so let's skip
the changelog when it has such 'delayed' changes.

Differential Revision: https://phab.mercurial-scm.org/D152

--- a/mercurial/localrepo.py	Sun Aug 06 17:47:41 2017 -0700
+++ b/mercurial/localrepo.py	Wed Jul 19 13:34:06 2017 -0700
@@ -1461,6 +1461,13 @@
             # dirstate is invalidated separately in invalidatedirstate()
             if k == 'dirstate':
                 continue
+            if (k == 'changelog' and
+                self.currenttransaction() and
+                self.changelog._delayed):
+                # The changelog object may store unwritten revisions. We don't
+                # want to lose them.
+                # TODO: Solve the problem instead of working around it.
+                continue
 
             if clearfilecache:
                 del self._filecache[k]

--- a/tests/test-context.py	Sun Aug 06 17:47:41 2017 -0700
+++ b/tests/test-context.py	Wed Jul 19 13:34:06 2017 -0700
@@ -179,3 +179,14 @@
             print('data mismatch')
     except Exception as ex:
         print('cannot read data: %r' % ex)
+
+with repo.wlock(), repo.lock(), repo.transaction('test'):
+    with open(b'4', 'wb') as f:
+        f.write(b'4')
+    repo.dirstate.normal('4')
+    repo.commit('4')
+    revsbefore = len(repo.changelog)
+    repo.invalidate(clearfilecache=True)
+    revsafter = len(repo.changelog)
+    if revsbefore != revsafter:
+        print('changeset lost by repo.invalidate()')