fix: Properly close adb and rclone on exit

Fixes VRPirates#34

Cleanly closes `adb` and `rclone` connections when the application
exits, ensuring resources are freed and preventing potential issues.
This addresses a previous oversight where these connections weren't
properly closed, potentially leading to resource leaks and unexpected
behavior.

Even though we free up the adb connection we don't close the server
because other programs may be using the connection.

The changes introduce a `destroy()` function in `tools.js` that handles
the cleanup. This function is called when the application receives the
"will-quit" event, ensuring that resources are freed before the
application terminates.

This change enhances the application's reliability and stability by
preventing resource leaks and ensuring a clean exit.

main.js

@@ -538,6 +538,11 @@ async function startApp() {
       app.quit();
     }
   });
+
+  app.on("will-quit", async () => {
+    console.log("will-quit");
+    await tools.destroy();
+  });
 }
 
 startApp();

tools.js

@@ -30,7 +30,7 @@ const l = 32;
 const configLocationOld = path.join(global.homedir, "sidenoder-config.json");
 const configLocation = path.join(global.sidenoderHome, "config.json");
 
-let agentOculus, agentSteam, agentSQ;
+let agentOculus, agentSteam, agentSQ, tracker;
 
 init();
 
@@ -63,6 +63,7 @@ module.exports = {
   trackDevices,
   checkDeps,
   checkMount,
+  destroy,
   mount,
   killRClone,
   getDir,
@@ -908,7 +909,7 @@ async function trackDevices() {
   await getDeviceSync();
 
   try {
-    const tracker = await adb.trackDevices();
+    tracker = await adb.trackDevices();
     tracker.on("add", async (device) => {
       console.log("Device was plugged in", device.id);
       // await getDeviceSync();
@@ -926,15 +927,25 @@ async function trackDevices() {
     });
 
     tracker.on("end", () => {
-      console.error("Tracking stopped");
-      trackDevices();
+      console.log("Tracking stopped");
     });
   } catch (err) {
     console.error("Something went wrong:", err.stack);
     returnError(err);
   }
 }
 
+async function destroy() {
+  try {
+    await killRClone();
+  } catch (_err) {
+    console.log("rclone not started");
+  }
+
+  tracker.end();
+  tracker = null;
+}
+
 async function appInfo(args) {
   const { res, pkg } = args;
   const app = KMETAS[pkg];
@@ -1495,7 +1506,7 @@ async function killRClone() {
     platform == "win"
       ? `taskkill.exe /F /T /IM rclone.exe`
       : `killall -9 rclone`;
-  console.log("try kill rclone");
+  console.log("killing rclone");
   return new Promise((res, rej) => {
     exec(killCmd, (error, stdout, stderr) => {
       if (error) {
@@ -1624,17 +1635,23 @@ async function mount() {
   exec(
     `"${rcloneCmd}" ${mountCmd} --read-only --rc --rc-no-auth --config="${global.currentConfiguration.rcloneConf}" ${global.currentConfiguration.cfgSection}: "${global.mountFolder}"`,
     (error, stdout, stderr) => {
-      if (error) {
-        console.error("rclone error:", error);
-        if (RCLONE_ID != myId) error = false;
-        console.log({ RCLONE_ID, myId });
-        win.webContents.send("check_mount", { success: false, error });
-        // checkMount();
-        /*if (error.message.search('transport endpoint is not connected')) {
-        console.log('GEVONDE');
-      }*/
+      try {
+        // We need to use a try/catch here because the callback may have been
+        // called after rclone has been closed.
+        if (error) {
+          if (!tracker) {
+            // Window is closing
+            return;
+          }
+          console.error("rclone error:", error);
+          if (RCLONE_ID != myId) error = false;
+          console.log({ RCLONE_ID, myId });
+          win.webContents.send("check_mount", { success: false, error });
 
-        return;
+          return;
+        }
+      } catch (e) {
+        // Do nothing
       }
 
       if (stderr) {