From 7ca7d478cc85d2db3fcdb60f8b12f20415836f9b Mon Sep 17 00:00:00 2001
From: Jaime Idolpx <jaime@idolpx.com>
Date: Tue, 9 Jun 2026 13:31:14 -0400
Subject: [PATCH] feat(settings): add support for mirroring settings to SD card
 if mounted

---
 src/app/settings.ts | 28 +++++++++++++++++++++-------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/src/app/settings.ts b/src/app/settings.ts
index c2182e4..3d77a06 100644
--- a/src/app/settings.ts
+++ b/src/app/settings.ts
@@ -16,12 +16,14 @@ import {
   createFolder,
   getFileContents,
   putFileContents,
+  stat,
 } from './webdav';
 
 /** The canonical paths on the WebDAV server. */
 export const SETTINGS_PATH = '/.sys/config.json';
 export const DEVICES_PATH  = '/.sys/devices.json';
 const SETTINGS_DIR = '/.sys';
+const SD_SYS_DIR   = '/sd/.sys';
 
 /**
  * How long to wait after the last change before writing to disk.
@@ -75,17 +77,29 @@ export async function readSettings(): Promise<SettingsConfig | null> {
  * indentation so the file is diff-friendly.
  */
 export async function writeSettings(config: SettingsConfig): Promise<void> {
-  try {
-    await createFolder(SETTINGS_DIR, true);
-  } catch {
-    /* directory may already exist; ignore */
-  }
+  try { await createFolder(SETTINGS_DIR, true); } catch { /* exists */ }
+
   const { iec, ...mainConfig } = config;
   const { devices: iecDevices, ...iecBusConfig } = (iec ?? {}) as any;
+  const configJson  = JSON.stringify({ ...mainConfig, iec: iecBusConfig }, null, 2) + '\n';
+  const devicesJson = JSON.stringify({ iec: { devices: iecDevices } },     null, 2) + '\n';
+
   await Promise.all([
-    putFileContents(SETTINGS_PATH, JSON.stringify({ ...mainConfig, iec: iecBusConfig }, null, 2) + '\n'),
-    putFileContents(DEVICES_PATH,  JSON.stringify({ iec: { devices: iecDevices } },     null, 2) + '\n'),
+    putFileContents(SETTINGS_PATH, configJson),
+    putFileContents(DEVICES_PATH,  devicesJson),
   ]);
+
+  // Mirror to /sd/.sys/ if the SD card is mounted.
+  try {
+    const sdStat = await stat('/sd');
+    if (sdStat) {
+      try { await createFolder(SD_SYS_DIR, true); } catch { /* exists */ }
+      await Promise.all([
+        putFileContents(SD_SYS_DIR + '/config.json',  configJson),
+        putFileContents(SD_SYS_DIR + '/devices.json', devicesJson),
+      ]);
+    }
+  } catch { /* /sd unreachable — skip mirror */ }
 }
 
 export type SaveStatus =