From a64ae36bcc064275a0a00443e818e36a2f654cd4 Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@kastelo.net>
Date: Sat, 7 Oct 2023 04:09:51 +0200
Subject: [PATCH] lib/model: Verify versioning on configuration reload (fixes
 #9106) (#9154)

---
 lib/model/model.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/lib/model/model.go b/lib/model/model.go
index 970d84c45..c8007f61d 100644
--- a/lib/model/model.go
+++ b/lib/model/model.go
@@ -2976,6 +2976,16 @@ func (*model) VerifyConfiguration(from, to config.Configuration) error {
 			return errors.New("folder type must not be changed from/to receive-encrypted")
 		}
 	}
+
+	// Verify that any requested versioning is possible to construct, or we
+	// will panic later when starting the folder.
+	for _, to := range to.Folders {
+		if to.Versioning.Type != "" {
+			if _, err := versioner.New(to); err != nil {
+				return err
+			}
+		}
+	}
 	return nil
 }