Properly detect advanced device info

app/src/main/java/com/topjohnwu/magisk/core/Info.kt

@@ -24,12 +24,15 @@ object Info {
     @JvmStatic
     var stub: DynAPK.Data? = null  // Stub
 
-    @JvmStatic
-    var keepVerity = false
-    @JvmStatic
-    var keepEnc = false
-    @JvmStatic
-    var recovery = false
+    // Toggle-able options
+    @JvmStatic var keepVerity = false
+    @JvmStatic var keepEnc = false
+    @JvmStatic var recovery = false
+
+    // Immutable device state
+    @JvmStatic var isSAR = false
+    @JvmStatic var isAB = false
+    @JvmStatic var ramdisk = false
 
     val isConnected by lazy {
         KObservableField(false).also { field ->

app/src/main/java/com/topjohnwu/magisk/core/utils/RootInit.kt

@@ -26,17 +26,20 @@ class RootInit : Shell.Initializer() {
         }
 
         job.add(
+            "export BOOTMODE=true",
             "mount_partitions",
             "get_flags",
-            "run_migrations",
-            "export BOOTMODE=true"
+            "run_migrations"
         ).exec()
 
         fun getvar(name: String) = ShellUtils.fastCmd(shell, "echo \$$name").toBoolean()
 
         Info.keepVerity = getvar("KEEPVERITY")
         Info.keepEnc = getvar("KEEPFORCEENCRYPT")
+        Info.isSAR = getvar("SYSTEM_ROOT")
+        Info.ramdisk = shell.newJob().add("check_boot_ramdisk").exec().isSuccess
         Info.recovery = getvar("RECOVERYMODE")
+        Info.isAB = getvar("ISAB")
 
         return true
     }

app/src/main/java/com/topjohnwu/magisk/extensions/XAndroid.kt

@@ -38,10 +38,8 @@ import com.topjohnwu.magisk.core.utils.Utils
 import com.topjohnwu.magisk.core.utils.currentLocale
 import com.topjohnwu.magisk.utils.DynamicClassLoader
 import com.topjohnwu.superuser.Shell
-import com.topjohnwu.superuser.ShellUtils
 import java.io.File
 import java.io.FileNotFoundException
-import java.text.SimpleDateFormat
 import java.lang.reflect.Array as JArray
 
 val packageName: String get() = get<Context>().packageName
@@ -320,20 +318,6 @@ fun Context.hasPermissions(vararg permissions: String) = permissions.all {
     ContextCompat.checkSelfPermission(this, it) == PERMISSION_GRANTED
 }
 
-private val securityLevelFormatter get() = SimpleDateFormat("yyyy-MM-dd",
-    currentLocale
-)
-
-val isSAR
-    get() = ShellUtils
-        .fastCmd("grep_prop ro.build.system_root_image")
-        .let { it.isNotEmpty() && it.toBoolean() }
-
-val isAB
-    get() = ShellUtils
-        .fastCmd("grep_prop ro.build.ab_update")
-        .let { it.isNotEmpty() && it.toBoolean() }
-
 fun Activity.hideKeyboard() {
     val view = currentFocus ?: return
     getSystemService<InputMethodManager>()