+ if ! m $old_shell /a/exe/primary-setup localhost; then
+ die due to failed btrbk of /o, we tried to restore old host as primary, but then we failed at that too. To resolve: Fix & rerun switch-mail-host, or fix and rerun primary-setup localhost on old shell so you have a working mail server and then rerun switch-mail-host.
+ fi
+ e finished restoring old host as primary, now exiting $ret due to earlier failed btrbk of /o.