--- a/mercurial/configitems.py Fri Apr 09 03:36:24 2021 +0200
+++ b/mercurial/configitems.py Thu Jan 14 04:58:20 2021 +0100
@@ -1325,10 +1325,22 @@
b'usestore',
default=True,
)
+
+
+def _persistent_nodemap_default():
+ """compute `use-persistent-nodemap` default value
+
+ The feature is disabled unless a fast implementation is available.
+ """
+ from . import policy
+
+ return policy.importrust('revlog') is not None
+
+
coreconfigitem(
b'format',
b'use-persistent-nodemap',
- default=False,
+ default=_persistent_nodemap_default,
)
# TODO needs to grow a docket file to at least store the last offset of the data
# file when rewriting sidedata.