# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@octobus.net>
# Date 2021-07-26 19:55:53
# 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 --git a/mercurial/helptext/config.txt b/mercurial/helptext/config.txt
--- a/mercurial/helptext/config.txt
+++ b/mercurial/helptext/config.txt
@@ -913,6 +913,14 @@ https://www.mercurial-scm.org/wiki/Missi
     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.