global-functions: $ScriptInstallUpdate: handle config version decrease...

... and log a warning.

1 files changed, 7 insertions, 1 deletions

diff --git a/global-functions b/global-functions
index 9e89670..9ed6b4a 100644
--- a/global-functions
+++ b/global-functions
@@ -796,7 +796,13 @@
     }
   }
 
-  :if ($ExpectedConfigVersionBefore != $ExpectedConfigVersion) do={
+  :if ($ExpectedConfigVersionBefore > $ExpectedConfigVersion) do={
+    $LogPrintExit2 warning $0 ("The configuration version decreased from " . \
+      $ExpectedConfigVersionBefore . " to " . $ExpectedConfigVersion . \
+      ". Installed an older version?") false;
+  }
+
+  :if ($ExpectedConfigVersionBefore < $ExpectedConfigVersion) do={
     :global GlobalConfigChanges;
     :global GlobalConfigMigration;
     :local ChangeLogCode;