manager: check init_boot more precisely

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

@@ -8,6 +8,7 @@ import android.util.Log
 import com.topjohnwu.superuser.CallbackList
 import com.topjohnwu.superuser.Shell
 import com.topjohnwu.superuser.ShellUtils
+import com.topjohnwu.superuser.io.SuFile
 import me.weishu.kernelsu.BuildConfig
 import me.weishu.kernelsu.Natives
 import me.weishu.kernelsu.ksuApp
@@ -240,6 +241,14 @@ fun isAbDevice(): Boolean {
 
 fun isInitBoot(): Boolean {
     val shell = getRootShell()
+    if (shell.isRoot) {
+        // if we have root, use /dev/block/by-name/init_boot to check
+        val abDevice = isAbDevice()
+        val initBootBlock = "/dev/block/by-name/init_boot${if (abDevice) "_a" else ""}"
+        val file = SuFile(initBootBlock)
+        file.shell = shell
+        return file.exists()
+    }
     // https://source.android.com/docs/core/architecture/partitions/generic-boot
     return ShellUtils.fastCmd(shell, "getprop ro.product.first_api_level").trim().toInt() >= Build.VERSION_CODES.TIRAMISU
 }