按源保护 OPFS 参数备份失败边界

web/src/wasm-core.js

@@ -529,7 +529,12 @@ function installOpfsWorkspace(module, options) {
       const backupPath = `${LINUXCNC_DEFAULT_PARAMETER_FILE}.bak`;
       const backupData = readFirstExistingWasmFile(module, [backupPath, `/${backupPath}`]);
       if (backupData !== null) {
-        await writeOpfsFile(workspacePath, `${path}.bak`, backupData);
+        try {
+          await writeOpfsFile(workspacePath, `${path}.bak`, backupData);
+        } catch (_backupError) {
+          // LinuxCNC reports link(filename, filename + ".bak") failures
+          // with perror() and still renames filename + ".new" over filename.
+        }
       } else {
         await removeOpfsFileEntry(workspacePath, `${path}.bak`);
       }