Add KernelSU Support

* This is an initial support for KernelSU, I am not sure it's works well
  or not, If it doesn't work well, please tell me.
* Because of Substratum is no longer update now, I will not make a pull request to
  the upstream.
* Still need improve, the way to detect KernelSU is not good as I
  expect.

app/src/main/java/projekt/substratum/common/References.java

@@ -250,19 +250,35 @@ public static String getSystemDir() {
         return getMagiskDirectory() + "/system";
     }
 
+    public static boolean isInteger(String str) {
+        try {
+            Integer.parseInt(str);
+            return true;
+        } catch (NumberFormatException e) {
+            return false;
+        }
+    }
+
     public static String getMagiskDirectory() {
-        final int magiskVer = Integer.parseInt(Root.runCommand("su -V"));
+        final int suVer = Integer.parseInt(Root.runCommand("su -V"));
         if (magiskDir != null)
-            return magiskDir;
-        if (magiskVer >= 18000 && magiskVer <= 18100) {
-            magiskDir = "/sbin/.magisk/img/substratum";
-        } else if (magiskVer >= 18101) {
+                return magiskDir;
+        String result = Root.runCommand("su -c \"magisk -V\"");
+        if (isInteger(result)){
+            final int magiskVer = Integer.parseInt(Root.runCommand("su -c \"magisk -V\""));
+            if (magiskVer >= 18000 && magiskVer <= 18100) {
+                magiskDir = "/sbin/.magisk/img/substratum";
+            } else if (magiskVer >= 18101) {
+                magiskDir = "/data/adb/modules/substratum";
+            } else {
+                Log.d("MagiskCheck", "Magisk version cannot be lesser than 18.0, switching to system-installation");
+                magiskDir = "/";
+            }
+        }
+        else {
             magiskDir = "/data/adb/modules/substratum";
-        } else {
-            Log.d("MagiskCheck", "Magisk version cannot be lesser than 18.0, switching to system-installation");
-            magiskDir = "/";
         }
-        Log.d("MagiskCheck", String.format("Detected directory %s for version %d", magiskDir, magiskVer));
+        Log.d("MagiskCheck", String.format("Detected directory %s for version %d", magiskDir, suVer));
         return magiskDir;
     }
 
@@ -954,4 +970,4 @@ protected Void doInBackground(Void... sUrl) {
             return null;
         }
     }
-}
+}

app/src/main/java/projekt/substratum/util/helpers/MagiskHelper.java

@@ -23,14 +23,14 @@ public class MagiskHelper {
     private static void installModule(final Context context) {
         // Return if not using Magisk, when directory is "/" it means the version
         // is unsupported and we're falling back to modifying system.
-        if (!checkMagisk() || MAGISK_DIR.equals("/"))
+        if ((!checkMagisk() &&!checkKernelSU())|| MAGISK_DIR.equals("/"))
             return;
 
         Substratum.log(TAG, "Magisk module does not exist, creating!");
         String command = "set -ex \n" +
                 String.format("mkdir -p %s; ", MAGISK_DIR) +
                 String.format(
-                        "printf 'name=substratum\nversion=%s\nversionCode=%s\nauthor=substratum development team\ndescription=Systemless overlays for Substratum\nminMagisk=1500\n' > %s/module.prop; ",
+                        "printf 'id=substratum\nname=substratum\nversion=%s\nversionCode=%s\nauthor=substratum development team\ndescription=Systemless overlays for Substratum\nminMagisk=1500\n' > %s/module.prop; ",
                         BuildConfig.VERSION_NAME,
                         BuildConfig.VERSION_CODE,
                         MAGISK_DIR
@@ -49,7 +49,9 @@ public static void handleModule(final Context context) {
     private static boolean checkMagisk() {
         return Root.runCommand("su --version").contains("MAGISKSU");
     }
-
+    private static boolean checkKernelSU() {
+        return Root.runCommand("su --version").contains("KernelSU");
+    }
     private static boolean moduleExists() {
         return Root.runCommand(String.format("test -d %s && echo '1'", MAGISK_DIR)).equals("1");
     }