feat: Implement fallback file move

src/main.rs

@@ -42,18 +42,23 @@ where
         tmp.into_temp_path()
     };
 
-    if let Err(err) = fs::rename(&tmp_path, &path) {
+    if let Err(_) = fs::rename(&tmp_path, &path) {
+        // Attempt manual copy-and-delete
+        let mut tmp = File::open(&tmp_path).with_context(|| "failed to open tempfile for reading")?;
+        let mut f = File::open(&path).with_context(|| "failed to open destination file")?;
+        if let Err(err) = io::copy(&mut tmp, &mut f) {
             let tmp_path = tmp_path
                 .keep()
                 .with_context(|| "failed to persist temporary file")?;
             bail!(
-            "failed to rename temporary file to override the sound bank: {}!\n\
+                "failed to rename or move temporary file to override the sound bank: {}!\n\
-                Please manually copy the file from {} to {}.",
+                Please manually move the file from {} to {}.",
                 err,
                 tmp_path.display(),
                 path.as_ref().display()
             );
         }
+    }
 
     Ok(())
 }