From 426339eab9b4641469265b539c5537a1e39a2a18 Mon Sep 17 00:00:00 2001
From: Antonio SJ Musumeci <trapexit@spawn.link>
Date: Fri, 9 Jan 2026 21:20:36 -0600
Subject: [PATCH] mergerfs_webui.cpp

---
 src/mergerfs_webui.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/mergerfs_webui.cpp b/src/mergerfs_webui.cpp
index f29a7ce2..4db9c129 100644
--- a/src/mergerfs_webui.cpp
+++ b/src/mergerfs_webui.cpp
@@ -33,7 +33,13 @@ _generate_error(const fs::path    &mount_,
   switch(err_)
     {
     case -EROFS:
-    case -EINVAL;
+      rv["msg"] = fmt::format("'{}' is read only.",key_);
+      break;
+    case -EINVAL:
+      rv["msg"] = fmt::format("value '{}' is invalid for '{}'",
+                              val_,
+                              key_);
+      break;
     case -EACCES:
       rv["msg"] = fmt::format("mergerfs.webui (pid {}) is running as uid {}"
                               " which appears not to have access to modify the"