--- a/tests/test-upgrade-repo.t Tue Mar 22 14:14:52 2022 +0100
+++ b/tests/test-upgrade-repo.t Tue Apr 05 03:36:31 2022 +0200
@@ -2061,3 +2061,18 @@
tracked-hint: no
share-safe: yes
+Attempting Auto-upgrade on a read-only repository
+-------------------------------------------------
+
+ $ chmod -R a-w auto-upgrade
+
+ $ hg status -R auto-upgrade \
+ > --config format.use-dirstate-v2.automatic-upgrade-of-mismatching-repositories=yes \
+ > --config format.use-dirstate-v2=no
+ abort: could not lock working directory of auto-upgrade: Permission denied
+ [20]
+ $ hg debugformat -R auto-upgrade | grep dirstate-v2
+ dirstate-v2: yes
+
+ $ chmod -R u+w auto-upgrade
+