manager: check overlayfs support

manager/app/src/main/java/me/weishu/kernelsu/ui/screen/Module.kt

@@ -32,6 +32,7 @@ import me.weishu.kernelsu.Natives
 import me.weishu.kernelsu.R
 import me.weishu.kernelsu.ui.screen.destinations.InstallScreenDestination
 import me.weishu.kernelsu.ui.util.LocalSnackbarHost
+import me.weishu.kernelsu.ui.util.overlayFsAvailable
 import me.weishu.kernelsu.ui.util.toggleModule
 import me.weishu.kernelsu.ui.util.uninstallModule
 import me.weishu.kernelsu.ui.viewmodel.ModuleViewModel
@@ -105,6 +106,14 @@ fun ModuleScreen(navigator: DestinationsNavigator) {
                 .padding(16.dp)
                 .fillMaxSize()
         ) {
+            val isOverlayAvailable = overlayFsAvailable()
+            if (!isOverlayAvailable) {
+                swipeState.isRefreshing = false
+                Box(modifier = Modifier.fillMaxSize(), contentAlignment = Alignment.Center) {
+                    Text(stringResource(R.string.module_overlay_fs_not_available))
+                }
+                return@SwipeRefresh
+            }
             val isEmpty = viewModel.moduleList.isEmpty()
             if (isEmpty) {
                 swipeState.isRefreshing = false

manager/app/src/main/java/me/weishu/kernelsu/ui/util/KsuCli.kt

@@ -102,4 +102,10 @@ fun reboot(reason: String = "") {
         ShellUtils.fastCmd(shell, "/system/bin/input keyevent 26")
     }
     ShellUtils.fastCmd(shell, "/system/bin/svc power reboot $reason || /system/bin/reboot $reason")
+}
+
+fun overlayFsAvailable(): Boolean {
+    val shell = createRootShell()
+    // check /proc/filesystems
+    return ShellUtils.fastCmdResult(shell, "cat /proc/filesystems | grep overlay")
 }