block devices: filter the root disk

src/system.js

@@ -319,22 +319,28 @@ async function getLogs(unit, options) {
 
 // this gets block devices as opposed to mounted filesystems. this is used for configuring backups and volumes in the frontend
 async function getBlockDevices() {
-    const result = await shell.spawn('lsblk', ['--paths', '--json', '--list', '--fs', '--output', '+rota'], { encoding: 'utf8' });
-    const info = safe.JSON.parse(result);
+    const output = await shell.spawn('lsblk', ['--paths', '--json', '--list', '--fs', '--output', '+rota'], { encoding: 'utf8' });
+    const info = safe.JSON.parse(output);
     if (!info) throw new BoxError(BoxError.INTERNAL_ERROR, `failed to parse lsblk: ${safe.error.message}`);
 
     const devices = info.blockdevices.filter(d => d.fstype === 'ext4' || d.fstype === 'xfs');
 
-    return devices.map(function (d) {
-        return {
-            path: d.name,
-            size: d.fsavail || 0,
-            type: d.fstype,
-            uuid: d.uuid,
-            rota: d.rota, // false (ssd) true (hdd) . unforuntately, this is not set correctly when virtualized (like in DO)
-            mountpoint: Array.isArray(d.mountpoints) ? d.mountpoints[d.mountpoints.length-1] : d.mountpoint // we only support one mountpoint here old lsblk only exposed one via .mountpoint
-        };
-    }).filter(d => d.mountpoint !== '/boot');
+    const result = [];
+    for (const device of devices) {
+        const mountpoints = Array.isArray(device.mountpoints) ? device.mountpoints : [ device.mountpoint ]; // we only support one mountpoint here old lsblk only exposed one via .mountpoint
+        if (mountpoints.includes('/') || mountpoints.includes('/boot')) continue;
+
+        result.push({
+            path: device.name,
+            size: device.fsavail || 0,
+            type: device.fstype,
+            uuid: device.uuid,
+            rota: device.rota, // false (ssd) true (hdd) . unforuntately, this is not set correctly when virtualized (like in DO)
+            mountpoints
+        });
+    }
+
+    return result;
 }
 
 async function checkRebootRequired() {