changelog: also monitor `00changelog.n` when applicable (issue6554)

This let the locarepo's file cache detect outdated nodemap docket and reload the
changelog after `localrepo.invalidate` when applicable.

Differential Revision: https://phab.mercurial-scm.org/D11482

mercurial/localrepo.py

@@ -144,6 +144,21 b' class storecache(_basefilecache):'
         return obj.sjoin(fname)
 
 
+class changelogcache(storecache):
+    """filecache for the changelog"""
+
+    def __init__(self):
+        super(changelogcache, self).__init__()
+        _cachedfiles.add((b'00changelog.i', b''))
+        _cachedfiles.add((b'00changelog.n', b''))
+
+    def tracked_paths(self, obj):
+        paths = [self.join(obj, b'00changelog.i')]
+        if obj.store.opener.options.get(b'persistent-nodemap', False):
+            paths.append(self.join(obj, b'00changelog.n'))
+        return paths
+
+
 class mixedrepostorecache(_basefilecache):
     """filecache for a mix files in .hg/store and outside"""
 
@@ -1673,13 +1688,13 b' class localrepository(object):'
     def obsstore(self):
         return obsolete.makestore(self.ui, self)
 
-    @storecache(b'00changelog.i')
-    def changelog(self):
+    @changelogcache()
+    def changelog(repo):
         # load dirstate before changelog to avoid race see issue6303
-        self.dirstate.prefetch_parents()
-        return self.store.changelog(
-            txnutil.mayhavepending(self.root),
-            concurrencychecker=revlogchecker.get_checker(self.ui, b'changelog'),
+        repo.dirstate.prefetch_parents()
+        return repo.store.changelog(
+            txnutil.mayhavepending(repo.root),
+            concurrencychecker=revlogchecker.get_checker(repo.ui, b'changelog'),
         )
 
     @storecache(b'00manifest.i')

tests/test-persistent-nodemap.t

@@ -748,19 +748,19 b' read/write patterns.'
   docket-details:
     uid:         43c37dde
     actual-tip:  5006
-    tip-rev:     5005
-    data-length: 121088
+    tip-rev:     5006
+    data-length: 121280
   right ready to write, waiting for reader
   right proceeding with writing its changelog index and nodemap
   finalized changelog write
   persisting changelog nodemap
-    new data start at 121088
+    new data start at 121280
   persisted changelog nodemap
   docket-details:
     uid:         43c37dde
     actual-tip:  5007
     tip-rev:     5007
-    data-length: 121472
+    data-length: 121536
   $ sh "$RUNTESTDIR"/testlib/wait-on-file 10 sync-files/reader-done
   $ cat outputs/reader.txt
   reader: reading changelog
@@ -768,7 +768,7 b' read/write patterns.'
   reader: nodemap docket read
   record-data-length: 121280
   actual-data-length: 121280
-  file-actual-length: 121472
+  file-actual-length: 121536
   reader: changelog read
   docket-details:
     uid:         43c37dde
@@ -778,8 +778,6 b' read/write patterns.'
   tip-rev:  5006
   tip-node: 492901161367
   node-rev: 5006
-  error while checking revision: 18 (known-bad-output !)
-    Inconsistency: Revision 5007 found in nodemap is not in revlog indexi (known-bad-output !)
 
   $ hg -R ./race-repo log -G -r 'head()'
   o  changeset:   5007:ac4a2abde241