# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 1627329353 -7200
# Node ID 6d79894d34605658ebda433ec775982db3994e36
# Parent  c2b8ad34d245cda33f73b12578bdafe660d1d875
help: indicate how to run downgrade a repository using persistent nodemap

We have a couple of report of people needing this. I am not fan of pointing
people to a debug command, but we don't have much better to offer right now

Differential Revision: https://phab.mercurial-scm.org/D11214

diff -r c2b8ad34d245 -r 6d79894d3460 mercurial/helptext/config.txt
--- a/mercurial/helptext/config.txt	Mon Jul 26 21:52:10 2021 +0200
+++ b/mercurial/helptext/config.txt	Mon Jul 26 21:55:53 2021 +0200
@@ -913,6 +913,14 @@
     By default this format variant is disabled if fast implementation is not
     available and enabled by default if the fast implementation is available.
 
+    To accomodate install of Mercurial without the fast implementation you can
+    downgrade your repository. To do so run the following command:
+
+    $ hg debugupgraderepo \
+          --run \
+          --config format.use-persistent-nodemap=False \
+          --config storage.revlog.persistent-nodemap.slow-path=allow
+
 ``use-share-safe``
     Enforce "safe" behaviors for all "shares" that access this repository.