Rewrite root shell

app/src/main/java/com/topjohnwu/magisk/MagiskFragment.java

@@ -197,7 +197,7 @@ public class MagiskFragment extends Fragment
                             @Override
                             public void onFinish() {
                                 progress.setMessage(getString(R.string.reboot_countdown, 0));
-                                Shell.su(true,
+                                magiskManager.rootShell.su(
                                         "mv -f " + uninstaller + " /cache/" + MagiskManager.UNINSTALLER,
                                         "mv -f " + utils + " /data/magisk/" + MagiskManager.UTIL_FUNCTIONS,
                                         "reboot"

app/src/main/java/com/topjohnwu/magisk/MagiskLogFragment.java

@@ -2,6 +2,7 @@ package com.topjohnwu.magisk;
 
 import android.Manifest;
 import android.annotation.SuppressLint;
+import android.app.Activity;
 import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
@@ -24,10 +25,9 @@ import android.widget.ScrollView;
 import android.widget.TextView;
 import android.widget.Toast;
 
-import com.topjohnwu.magisk.asyncs.RootTask;
+import com.topjohnwu.magisk.asyncs.ParallelTask;
 import com.topjohnwu.magisk.components.Fragment;
 import com.topjohnwu.magisk.components.SnackbarMaker;
-import com.topjohnwu.magisk.utils.Shell;
 import com.topjohnwu.magisk.utils.Utils;
 
 import java.io.File;
@@ -67,7 +67,7 @@ public class MagiskLogFragment extends Fragment {
 
         txtLog.setTextIsSelectable(true);
 
-        new LogManager().read();
+        new LogManager(getActivity()).read();
 
         return view;
     }
@@ -81,7 +81,7 @@ public class MagiskLogFragment extends Fragment {
     @Override
     public void onResume() {
         super.onResume();
-        new LogManager().read();
+        new LogManager(getActivity()).read();
     }
 
     @Override
@@ -100,13 +100,13 @@ public class MagiskLogFragment extends Fragment {
         mClickedMenuItem = item;
         switch (item.getItemId()) {
             case R.id.menu_refresh:
-                new LogManager().read();
+                new LogManager(getActivity()).read();
                 return true;
             case R.id.menu_save:
-                new LogManager().save();
+                new LogManager(getActivity()).save();
                 return true;
             case R.id.menu_clear:
-                new LogManager().clear();
+                new LogManager(getActivity()).clear();
                 return true;
             default:
                 return true;
@@ -127,18 +127,22 @@ public class MagiskLogFragment extends Fragment {
         }
     }
 
-    private class LogManager extends RootTask<Object, Void, Object> {
+    private class LogManager extends ParallelTask<Object, Void, Object> {
 
         int mode;
         File targetFile;
 
+        LogManager(Activity activity) {
+            super(activity);
+        }
+
         @SuppressLint("DefaultLocale")
         @Override
-        protected Object doInRoot(Object... params) {
+        protected Object doInBackground(Object... params) {
             mode = (int) params[0];
             switch (mode) {
                 case 0:
-                    List<String> logList = Utils.readFile(MAGISK_LOG);
+                    List<String> logList = Utils.readFile(magiskManager.rootShell, MAGISK_LOG);
 
                     if (Utils.isValidShellResponse(logList)) {
                         StringBuilder llog = new StringBuilder(15 * 10 * 1024);
@@ -150,7 +154,7 @@ public class MagiskLogFragment extends Fragment {
                     return "";
 
                 case 1:
-                    Shell.su("echo > " + MAGISK_LOG);
+                    magiskManager.rootShell.su("echo > " + MAGISK_LOG);
                     SnackbarMaker.make(txtLog, R.string.logs_cleared, Snackbar.LENGTH_SHORT).show();
                     return "";
 
@@ -180,7 +184,7 @@ public class MagiskLogFragment extends Fragment {
                         return false;
                     }
 
-                    List<String> in = Utils.readFile(MAGISK_LOG);
+                    List<String> in = Utils.readFile(magiskManager.rootShell, MAGISK_LOG);
 
                     if (Utils.isValidShellResponse(in)) {
                         try (FileWriter out = new FileWriter(targetFile)) {

app/src/main/java/com/topjohnwu/magisk/MagiskManager.java

@@ -88,13 +88,16 @@ public class MagiskManager extends Application {
     // Global resources
     public SharedPreferences prefs;
     public SuDatabaseHelper suDB;
+    public Shell rootShell;
 
     private static Handler mHandler = new Handler();
 
     @Override
     public void onCreate() {
         super.onCreate();
+        new File(getApplicationInfo().dataDir).mkdirs();  /* Create the app data directory */
         prefs = PreferenceManager.getDefaultSharedPreferences(this);
+        rootShell = Shell.getRootShell();
     }
 
     public void toast(String msg, int duration) {
@@ -117,14 +120,12 @@ public class MagiskManager extends Application {
         magiskHide = prefs.getBoolean("magiskhide", true);
         updateNotification = prefs.getBoolean("notification", true);
         initSU();
-        // Always start a new root shell manually, just for safety
-        Shell.init();
         updateMagiskInfo();
         // Initialize busybox
         File busybox = new File(getApplicationInfo().dataDir + "/busybox/busybox");
         if (!busybox.exists() || !TextUtils.equals(prefs.getString("busybox_version", ""), BUSYBOX_VERSION)) {
             busybox.getParentFile().mkdirs();
-            Shell.su(
+            rootShell.su(
                     "cp -f " + new File(getApplicationInfo().nativeLibraryDir, "libbusybox.so") + " " + busybox,
                     "chmod -R 755 " + busybox.getParent(),
                     busybox + " --install -s " + busybox.getParent()
@@ -136,7 +137,7 @@ public class MagiskManager extends Application {
                 .putBoolean("magiskhide", magiskHide)
                 .putBoolean("notification", updateNotification)
                 .putBoolean("hosts", new File("/magisk/.core/hosts").exists())
-                .putBoolean("disable", Utils.itemExist(MAGISK_DISABLE_FILE))
+                .putBoolean("disable", Utils.itemExist(rootShell, MAGISK_DISABLE_FILE))
                 .putBoolean("su_reauth", suReauth)
                 .putString("su_request_timeout", String.valueOf(suRequestTimeout))
                 .putString("su_auto_response", String.valueOf(suResponseType))
@@ -147,7 +148,7 @@ public class MagiskManager extends Application {
                 .putString("busybox_version", BUSYBOX_VERSION)
                 .apply();
         // Add busybox to PATH
-        Shell.su("PATH=$PATH:" + busybox.getParent());
+        rootShell.su("PATH=$PATH:" + busybox.getParent());
 
         // Create notification channel on Android O
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
@@ -167,9 +168,6 @@ public class MagiskManager extends Application {
     }
 
     public void initSU() {
-        // Create the app data directory, so su binary can work properly
-        new File(getApplicationInfo().dataDir).mkdirs();
-
         initSUConfig();
 
         List<String> ret = Shell.sh("su -v");

app/src/main/java/com/topjohnwu/magisk/ModulesFragment.java

@@ -20,6 +20,7 @@ import com.topjohnwu.magisk.components.Fragment;
 import com.topjohnwu.magisk.module.Module;
 import com.topjohnwu.magisk.utils.CallbackEvent;
 import com.topjohnwu.magisk.utils.Logger;
+import com.topjohnwu.magisk.utils.Shell;
 
 import java.util.ArrayList;
 import java.util.List;

app/src/main/java/com/topjohnwu/magisk/SettingsActivity.java

@@ -149,9 +149,9 @@ public class SettingsActivity extends Activity {
                 case "disable":
                     enabled = prefs.getBoolean("disable", false);
                     if (enabled) {
-                        Utils.createFile(MagiskManager.MAGISK_DISABLE_FILE);
+                        Utils.createFile(magiskManager.rootShell, MagiskManager.MAGISK_DISABLE_FILE);
                     } else {
-                        Utils.removeItem(MagiskManager.MAGISK_DISABLE_FILE);
+                        Utils.removeItem(magiskManager.rootShell, MagiskManager.MAGISK_DISABLE_FILE);
                     }
                     Toast.makeText(getActivity(), R.string.settings_reboot_toast, Toast.LENGTH_LONG).show();
                     break;
@@ -175,11 +175,11 @@ public class SettingsActivity extends Activity {
                 case "hosts":
                     enabled = prefs.getBoolean("hosts", false);
                     if (enabled) {
-                        Shell.su_async(null,
+                        magiskManager.rootShell.su(
                                 "cp -af /system/etc/hosts /magisk/.core/hosts",
                                 "mount -o bind /magisk/.core/hosts /system/etc/hosts");
                     } else {
-                        Shell.su_async(null,
+                        magiskManager.rootShell.su(
                                 "umount -l /system/etc/hosts",
                                 "rm -f /magisk/.core/hosts");
                     }

app/src/main/java/com/topjohnwu/magisk/adapters/ModulesAdapter.java

@@ -38,6 +38,7 @@ public class ModulesAdapter extends RecyclerView.Adapter<ModulesAdapter.ViewHold
     @Override
     public void onBindViewHolder(final ViewHolder holder, int position) {
         Context context = holder.itemView.getContext();
+        Shell rootShell = Shell.getRootShell(context);
         final Module module = mList.get(position);
 
         String version = module.getVersion();
@@ -55,10 +56,10 @@ public class ModulesAdapter extends RecyclerView.Adapter<ModulesAdapter.ViewHold
         holder.checkBox.setOnCheckedChangeListener((v, isChecked) -> {
             int snack;
             if (isChecked) {
-                module.removeDisableFile();
+                module.removeDisableFile(rootShell);
                 snack = R.string.disable_file_removed;
             } else {
-                module.createDisableFile();
+                module.createDisableFile(rootShell);
                 snack = R.string.disable_file_created;
             }
             SnackbarMaker.make(holder.itemView, snack, Snackbar.LENGTH_SHORT).show();
@@ -68,10 +69,10 @@ public class ModulesAdapter extends RecyclerView.Adapter<ModulesAdapter.ViewHold
             boolean removed = module.willBeRemoved();
             int snack;
             if (removed) {
-                module.deleteRemoveFile();
+                module.deleteRemoveFile(rootShell);
                 snack = R.string.remove_file_deleted;
             } else {
-                module.createRemoveFile();
+                module.createRemoveFile(rootShell);
                 snack = R.string.remove_file_created;
             }
             SnackbarMaker.make(holder.itemView, snack, Snackbar.LENGTH_SHORT).show();

app/src/main/java/com/topjohnwu/magisk/asyncs/FlashZip.java

@@ -9,7 +9,6 @@ import com.topjohnwu.magisk.MagiskManager;
 import com.topjohnwu.magisk.R;
 import com.topjohnwu.magisk.components.AlertDialogBuilder;
 import com.topjohnwu.magisk.utils.Logger;
-import com.topjohnwu.magisk.utils.Shell;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.ZipUtils;
 
@@ -21,7 +20,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.List;
 
-public class FlashZip extends RootTask<Void, String, Integer> {
+public class FlashZip extends ParallelTask<Void, String, Integer> {
 
     private Uri mUri;
     private File mCachedFile, mScriptFile, mCheckFile;
@@ -71,12 +70,12 @@ public class FlashZip extends RootTask<Void, String, Integer> {
     private boolean unzipAndCheck() throws Exception {
         ZipUtils.unzip(mCachedFile, mCachedFile.getParentFile(), "META-INF/com/google/android");
         List<String> ret;
-        ret = Utils.readFile(mCheckFile.getPath());
+        ret = Utils.readFile(magiskManager.rootShell, mCheckFile.getPath());
         return Utils.isValidShellResponse(ret) && ret.get(0).contains("#MAGISK");
     }
 
     private int cleanup(int ret) {
-        Shell.su(
+        magiskManager.rootShell.su(
                 "rm -rf " + mCachedFile.getParent() + "/*",
                 "rm -rf " + MagiskManager.TMP_FOLDER_PATH
         );
@@ -96,14 +95,14 @@ public class FlashZip extends RootTask<Void, String, Integer> {
     }
 
     @Override
-    protected Integer doInRoot(Void... voids) {
+    protected Integer doInBackground(Void... voids) {
         Logger.dev("FlashZip Running... " + mFilename);
         List<String> ret;
         try {
             copyToCache();
             if (!unzipAndCheck()) return cleanup(0);
             publishProgress(magiskManager.getString(R.string.zip_install_progress_msg, mFilename));
-            ret = Shell.su(
+            ret = magiskManager.rootShell.su(
                     "BOOTMODE=true sh " + mScriptFile + " dummy 1 " + mCachedFile,
                     "if [ $? -eq 0 ]; then echo true; else echo false; fi"
             );
@@ -147,7 +146,7 @@ public class FlashZip extends RootTask<Void, String, Integer> {
         new AlertDialogBuilder(activity)
                 .setTitle(R.string.reboot_title)
                 .setMessage(R.string.reboot_msg)
-                .setPositiveButton(R.string.reboot, (dialogInterface, i) -> Shell.su(true, "reboot"))
+                .setPositiveButton(R.string.reboot, (dialogInterface, i) -> magiskManager.rootShell.su("reboot"))
                 .setNegativeButton(R.string.no_thanks, null)
                 .show();
     }

app/src/main/java/com/topjohnwu/magisk/asyncs/GetBootBlocks.java

@@ -2,22 +2,21 @@ package com.topjohnwu.magisk.asyncs;
 
 import android.app.Activity;
 
-import com.topjohnwu.magisk.utils.Shell;
 import com.topjohnwu.magisk.utils.Utils;
 
-public class GetBootBlocks extends RootTask<Void, Void, Void> {
+public class GetBootBlocks extends ParallelTask<Void, Void, Void> {
 
     public GetBootBlocks(Activity context) {
         super(context);
     }
 
     @Override
-    protected Void doInRoot(Void... params) {
+    protected Void doInBackground(Void... params) {
-        magiskManager.blockList = Shell.su(
+        magiskManager.blockList = magiskManager.rootShell.su(
                 "find /dev/block -type b -maxdepth 1 | grep -v -E \"loop|ram|dm-0\""
         );
         if (magiskManager.bootBlock == null) {
-            magiskManager.bootBlock = Utils.detectBootImage();
+            magiskManager.bootBlock = Utils.detectBootImage(magiskManager.rootShell);
         }
         return null;
     }

app/src/main/java/com/topjohnwu/magisk/asyncs/LoadModules.java

@@ -9,23 +9,22 @@ import com.topjohnwu.magisk.utils.Logger;
 import com.topjohnwu.magisk.utils.Utils;
 import com.topjohnwu.magisk.utils.ValueSortedMap;
 
-public class LoadModules extends RootTask<Void, Void, Void> {
+public class LoadModules extends ParallelTask<Void, Void, Void> {
 
     public LoadModules(Activity context) {
         super(context);
     }
 
     @Override
-    protected Void doInRoot(Void... voids) {
+    protected Void doInBackground(Void... voids) {
         Logger.dev("LoadModules: Loading modules");
 
         magiskManager.moduleMap = new ValueSortedMap<>();
 
-        for (String path : Utils.getModList(MagiskManager.MAGISK_PATH)) {
+        for (String path : Utils.getModList(magiskManager.rootShell, MagiskManager.MAGISK_PATH)) {
             Logger.dev("LoadModules: Adding modules from " + path);
-            Module module;
             try {
-                module = new Module(path);
+                Module module = new Module(magiskManager.rootShell, path);
                 magiskManager.moduleMap.put(module.getId(), module);
             } catch (BaseModule.CacheModException ignored) {}
         }

app/src/main/java/com/topjohnwu/magisk/asyncs/MagiskHide.java

@@ -2,11 +2,9 @@ package com.topjohnwu.magisk.asyncs;
 
 import android.app.Activity;
 
-import com.topjohnwu.magisk.utils.Shell;
-
 import java.util.List;
 
-public class MagiskHide extends RootTask<Object, Void, Void> {
+public class MagiskHide extends ParallelTask<Object, Void, Void> {
 
     private boolean isList = false;
 
@@ -17,9 +15,9 @@ public class MagiskHide extends RootTask<Object, Void, Void> {
     }
 
     @Override
-    protected Void doInRoot(Object... params) {
+    protected Void doInBackground(Object... params) {
         String command = (String) params[0];
-        List<String> ret = Shell.su("magiskhide --" + command);
+        List<String> ret = magiskManager.rootShell.su("magiskhide --" + command);
         if (isList) {
             magiskManager.magiskHideList = ret;
         }

app/src/main/java/com/topjohnwu/magisk/asyncs/ProcessMagiskZip.java

@@ -33,13 +33,11 @@ public class ProcessMagiskZip extends ParallelTask<Void, Void, Boolean> {
     @Override
     protected Boolean doInBackground(Void... params) {
         if (Shell.rootAccess()) {
-            synchronized (Shell.lock) {
+            magiskManager.rootShell.su("rm -f /dev/.magisk",
-                Shell.su("rm -f /dev/.magisk",
                     (mBoot != null) ? "echo \"BOOTIMAGE=" + mBoot + "\" >> /dev/.magisk" : "",
                     "echo \"KEEPFORCEENCRYPT=" + String.valueOf(mEnc) + "\" >> /dev/.magisk",
                     "echo \"KEEPVERITY=" + String.valueOf(mVerity) + "\" >> /dev/.magisk"
             );
-            }
             return true;
         }
         return false;

app/src/main/java/com/topjohnwu/magisk/asyncs/RootTask.java

@@ -1,33 +0,0 @@
-package com.topjohnwu.magisk.asyncs;
-
-import android.app.Activity;
-
-import com.topjohnwu.magisk.utils.Shell;
-
-public abstract class RootTask <Params, Progress, Result> extends ParallelTask<Params, Progress, Result> {
-
-    public RootTask() {}
-
-    public RootTask(Activity context) {
-        super(context);
-    }
-
-    @SafeVarargs
-    @Override
-    final protected Result doInBackground(Params... params) {
-        synchronized (Shell.lock) {
-            return doInRoot(params);
-        }
-    }
-
-    @SuppressWarnings("unchecked")
-    abstract protected Result doInRoot(Params... params);
-
-    @SuppressWarnings("unchecked")
-    @Override
-    public void exec(Params... params) {
-        if (Shell.rootAccess()) {
-            super.exec(params);
-        }
-    }
-}

app/src/main/java/com/topjohnwu/magisk/module/Module.java

@@ -1,6 +1,7 @@
 package com.topjohnwu.magisk.module;
 
 import com.topjohnwu.magisk.utils.Logger;
+import com.topjohnwu.magisk.utils.Shell;
 import com.topjohnwu.magisk.utils.Utils;
 
 public class Module extends BaseModule {
@@ -8,9 +9,9 @@ public class Module extends BaseModule {
     private String mRemoveFile, mDisableFile, mUpdateFile;
     private boolean mEnable, mRemove, mUpdated;
 
-    public Module(String path) throws CacheModException {
+    public Module(Shell shell, String path) throws CacheModException {
 
-        parseProps(Utils.readFile(path + "/module.prop"));
+        parseProps(Utils.readFile(shell, path + "/module.prop"));
 
         mRemoveFile = path + "/remove";
         mDisableFile = path + "/disable";
@@ -27,33 +28,33 @@ public class Module extends BaseModule {
 
         Logger.dev("Creating Module, id: " + getId());
 
-        mEnable = !Utils.itemExist(mDisableFile);
+        mEnable = !Utils.itemExist(shell, mDisableFile);
-        mRemove = Utils.itemExist(mRemoveFile);
+        mRemove = Utils.itemExist(shell, mRemoveFile);
-        mUpdated = Utils.itemExist(mUpdateFile);
+        mUpdated = Utils.itemExist(shell, mUpdateFile);
     }
 
-    public void createDisableFile() {
+    public void createDisableFile(Shell shell) {
         mEnable = false;
-        Utils.createFile(mDisableFile);
+        Utils.createFile(shell, mDisableFile);
     }
 
-    public void removeDisableFile() {
+    public void removeDisableFile(Shell shell) {
         mEnable = true;
-        Utils.removeItem(mDisableFile);
+        Utils.removeItem(shell, mDisableFile);
     }
 
     public boolean isEnabled() {
         return mEnable;
     }
 
-    public void createRemoveFile() {
+    public void createRemoveFile(Shell shell) {
         mRemove = true;
-        Utils.createFile(mRemoveFile);
+        Utils.createFile(shell, mRemoveFile);
     }
 
-    public void deleteRemoveFile() {
+    public void deleteRemoveFile(Shell shell) {
         mRemove = false;
-        Utils.removeItem(mRemoveFile);
+        Utils.removeItem(shell, mRemoveFile);
     }
 
     public boolean willBeRemoved() {

app/src/main/java/com/topjohnwu/magisk/utils/Logger.java

@@ -11,23 +11,39 @@ public class Logger {
     public static final String MAIN_TAG = "Magisk";
     public static final String DEBUG_TAG = "MagiskManager";
 
+    public static void debug(String line) {
+        Log.d(DEBUG_TAG, "DEBUG: " + line);
+    }
+
     public static void debug(String fmt, Object... args) {
-        Log.d(DEBUG_TAG, "DEBUG: " + String.format(Locale.US, fmt, args));
+        debug(String.format(Locale.US, fmt, args));
+    }
+
+    public static void error(String line) {
+        Log.e(MAIN_TAG, "MANAGERERROR: " + line);
     }
 
     public static void error(String fmt, Object... args) {
-        Log.e(MAIN_TAG, "MANAGERERROR: " + String.format(Locale.US, fmt, args));
+        error(String.format(Locale.US, fmt, args));
+    }
+
+    public static void dev(String line) {
+        if (MagiskManager.devLogging) {
+            Log.d(DEBUG_TAG, line);
+        }
     }
 
     public static void dev(String fmt, Object... args) {
-        if (MagiskManager.devLogging) {
+        dev(String.format(Locale.US, fmt, args));
-            Log.d(DEBUG_TAG, String.format(Locale.US, fmt, args));
+    }
+
+    public static void shell(boolean root, String line) {
+        if (MagiskManager.shellLogging) {
+            Log.d(DEBUG_TAG, (root ? "MANAGERSU: " : "MANAGERSH: ") + line);
         }
     }
 
     public static void shell(boolean root, String fmt, Object... args) {
-        if (MagiskManager.shellLogging) {
+        shell(root, String.format(Locale.US, fmt, args));
-            Log.d(DEBUG_TAG, (root ? "MANAGERSU: " : "MANAGERSH: ") + String.format(Locale.US, fmt, args));
-        }
     }
 }

app/src/main/java/com/topjohnwu/magisk/utils/Shell.java

@@ -1,7 +1,8 @@
 package com.topjohnwu.magisk.utils;
 
-import com.topjohnwu.magisk.asyncs.RootTask;
+import android.content.Context;
 
+import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -16,37 +17,35 @@ public class Shell {
 
     // -1 = problematic/unknown issue; 0 = not rooted; 1 = properly rooted
     public static int rootStatus;
-    public static final Object lock = new Object();
 
     private static boolean isInit = false;
-    private static Process rootShell;
-    private static DataOutputStream rootSTDIN;
-    private static StreamGobbler rootSTDOUT;
-    private static List<String> rootOutList = Collections.synchronizedList(new ArrayList<String>());
 
-    public static void init() {
+    private final Process rootShell;
-
+    private final DataOutputStream rootSTDIN;
-        isInit = true;
+    private final DataInputStream rootSTDOUT;
 
+    private Shell() {
+        Process process;
         try {
-            rootShell = Runtime.getRuntime().exec("su");
+            process = Runtime.getRuntime().exec("su");
-            rootStatus = 1;
+        } catch (IOException e) {
-        } catch (IOException err) {
             // No root
             rootStatus = 0;
+            rootShell = null;
+            rootSTDIN = null;
+            rootSTDOUT = null;
             return;
         }
 
+        rootStatus = 1;
+        rootShell = process;
         rootSTDIN = new DataOutputStream(rootShell.getOutputStream());
-        rootSTDOUT = new StreamGobbler(rootShell.getInputStream(), rootOutList, true);
+        rootSTDOUT = new DataInputStream(rootShell.getInputStream());
-        rootSTDOUT.start();
 
-        // Setup umask and PATH
         su("umask 022");
-
         List<String> ret = su("echo -BOC-", "id");
 
-        if (ret == null) {
+        if (ret.isEmpty()) {
             // Something wrong with root, not allowed?
             rootStatus = -1;
             return;
@@ -55,7 +54,7 @@ public class Shell {
         for (String line : ret) {
             if (line.contains("uid=")) {
                 // id command is working, let's see if we are actually root
-                rootStatus = line.contains("uid=0") ? rootStatus : -1;
+                rootStatus = line.contains("uid=0") ? 1 : -1;
                 return;
             } else if (!line.contains("-BOC-")) {
                 rootStatus = -1;
@@ -64,8 +63,16 @@ public class Shell {
         }
     }
 
+    public static Shell getRootShell() {
+        return new Shell();
+    }
+
+    public static Shell getRootShell(Context context) {
+        return Utils.getMagiskManager(context).rootShell;
+    }
+
     public static boolean rootAccess() {
-        return isInit && rootStatus > 0;
+        return rootStatus > 0;
     }
 
     public static List<String> sh(String... commands) {
@@ -110,120 +117,34 @@ public class Shell {
         return res;
     }
 
-    // Run with the same shell by default
+    public List<String> su(String... commands) {
-    public static List<String> su(String... commands) {
+        List<String> res = new ArrayList<>();
-        return su(false, commands);
+        su(res, commands);
+        return res;
     }
 
-    public static List<String> su(boolean newShell, String... commands) {
+    public void su(List<String> res, String... commands) {
-        List<String> res;
-        Process process;
-        DataOutputStream STDIN;
-        StreamGobbler STDOUT;
-
-        // Create the default shell if not init
-        if (!newShell && !isInit) {
-            init();
-        }
-
-        if (!newShell && !rootAccess()) {
-            return null;
-        }
-
-        if (newShell) {
-            res = Collections.synchronizedList(new ArrayList<String>());
         try {
-                process = Runtime.getRuntime().exec("su");
+            rootShell.exitValue();
-                STDIN = new DataOutputStream(process.getOutputStream());
+            return;  // The process is dead, return
-                STDOUT = new StreamGobbler(process.getInputStream(), res);
+        } catch (IllegalThreadStateException ignored) {
-
+            // This should be the expected result
-                // Run the new shell with busybox and proper umask
-                STDIN.write(("umask 022\n").getBytes("UTF-8"));
-                STDIN.flush();
-            } catch (IOException err) {
-                return null;
         }
+        synchronized (rootShell) {
+            StreamGobbler STDOUT = new StreamGobbler(rootSTDOUT, Collections.synchronizedList(res), true);
             STDOUT.start();
-        } else {
-            process = rootShell;
-            STDIN = rootSTDIN;
-            STDOUT = rootSTDOUT;
-            res = rootOutList;
-            res.clear();
-        }
-
             try {
-            for (String write : commands) {
+                for (String command : commands) {
-                STDIN.write((write + "\n").getBytes("UTF-8"));
+                    rootSTDIN.write((command + "\n").getBytes("UTF-8"));
-                STDIN.flush();
+                    rootSTDIN.flush();
-                Logger.shell(true, write);
                 }
-            if (newShell) {
+                rootSTDIN.write(("echo \'-root-done-\'\n").getBytes("UTF-8"));
-                STDIN.write("exit\n".getBytes("UTF-8"));
+                rootSTDIN.flush();
-                STDIN.flush();
-                process.waitFor();
-
-                try {
-                    STDIN.close();
-                } catch (IOException ignore) {
-                    // might be closed already
-                }
-
                 STDOUT.join();
-                process.destroy();
+            } catch (InterruptedException | IOException e) {
-            } else {
+                e.printStackTrace();
-                STDIN.write(("echo\n").getBytes("UTF-8"));
+                rootShell.destroy();
-                STDIN.flush();
-                STDIN.write(("echo \'-root-done-\'\n").getBytes("UTF-8"));
-                STDIN.flush();
-                while (true) {
-                    try {
-                        // Process terminated, it means the interactive shell has some issues
-                        process.exitValue();
-                        rootStatus = -1;
-                        return null;
-                    } catch (IllegalThreadStateException e) {
-                        // Process still running, gobble output until done
-                        int end = res.size() - 1;
-                        if (end > 0) {
-                            if (res.get(end).equals("-root-done-")) {
-                                res.remove(end);
-                                if (res.get(end -1).isEmpty()) {
-                                    res.remove(end -1);
-                                }
-                                break;
             }
         }
-                        try { STDOUT.join(100); } catch (InterruptedException err) {
-                            rootStatus = -1;
-                            return null;
-                        }
-                    }
-                }
-            }
-        } catch (IOException e) {
-            if (!e.getMessage().contains("EPIPE")) {
-                Logger.dev("Shell: Root shell error...");
-                rootStatus = -1;
-                return null;
-            }
-        } catch(InterruptedException e) {
-            Logger.dev("Shell: Root shell error...");
-            rootStatus = -1;
-            return null;
-        }
-
-        return new ArrayList<>(res);
-    }
-
-    public static void su_async(List<String> result, String... commands) {
-        new RootTask<Void, Void, Void>() {
-            @Override
-            protected Void doInRoot(Void... params) {
-                List<String> ret = Shell.su(commands);
-                if (result != null) result.addAll(ret);
-                return null;
-            }
-        }.exec();
     }
 }

app/src/main/java/com/topjohnwu/magisk/utils/StreamGobbler.java

@@ -1,5 +1,7 @@
 package com.topjohnwu.magisk.utils;
 
+import android.text.TextUtils;
+
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
@@ -43,11 +45,11 @@ public class StreamGobbler extends Thread {
         try {
             String line;
             while ((line = reader.readLine()) != null) {
+                if (TextUtils.equals(line, "-root-done-"))
+                    return;
                 writer.add(line);
-                if (!line.equals("-root-done-") && !line.isEmpty()) {
                 Logger.shell(isRoot, "OUT: " + line);
             }
-            }
         } catch (IOException e) {
             // reader probably closed, expected exit condition
         }

app/src/main/java/com/topjohnwu/magisk/utils/Utils.java

@@ -43,33 +43,33 @@ public class Utils {
     private static final int MAGISK_UPDATE_NOTIFICATION_ID = 1;
     private static final int APK_UPDATE_NOTIFICATION_ID = 2;
 
-    public static boolean itemExist(String path) {
+    public static boolean itemExist(Shell shell, String path) {
         String command = "if [ -e " + path + " ]; then echo true; else echo false; fi";
-        List<String> ret = Shell.su(command);
+        List<String> ret = shell.su(command);
         return isValidShellResponse(ret) && Boolean.parseBoolean(ret.get(0));
     }
 
-    public static void createFile(String path) {
+    public static void createFile(Shell shell, String path) {
         String folder = path.substring(0, path.lastIndexOf('/'));
         String command = "mkdir -p " + folder + " 2>/dev/null; touch " + path + " 2>/dev/null; if [ -f \"" + path + "\" ]; then echo true; else echo false; fi";
-        Shell.su_async(null, command);
+        shell.su(command);
     }
 
-    public static void removeItem(String path) {
+    public static void removeItem(Shell shell, String path) {
         String command = "rm -rf " + path + " 2>/dev/null; if [ -e " + path + " ]; then echo false; else echo true; fi";
-        Shell.su_async(null, command);
+        shell.su(command);
     }
 
-    public static List<String> getModList(String path) {
+    public static List<String> getModList(Shell shell, String path) {
         String command = "find " + path + " -type d -maxdepth 1 ! -name \"*.core\" ! -name \"*lost+found\" ! -name \"*magisk\"";
-        return Shell.su(command);
+        return shell.su(command);
     }
 
-    public static List<String> readFile(String path) {
+    public static List<String> readFile(Shell shell, String path) {
         List<String> ret;
         String command = "cat " + path;
         if (Shell.rootAccess()) {
-            ret = Shell.su(command);
+            ret = shell.su(command);
         } else {
             ret = Shell.sh(command);
         }
@@ -114,7 +114,7 @@ public class Utils {
                 .replace("#", "").replace("@", "").replace("*", "");
     }
 
-    public static String detectBootImage() {
+    public static String detectBootImage(Shell shell) {
         String[] commands = {
                 "for PARTITION in kern-a KERN-A android_boot ANDROID_BOOT kernel KERNEL boot BOOT lnx LNX; do",
                 "BOOTIMAGE=`readlink /dev/block/by-name/$PARTITION || " +
@@ -124,7 +124,7 @@ public class Utils {
                 "done",
                 "echo \"$BOOTIMAGE\""
         };
-        List<String> ret = Shell.su(commands);
+        List<String> ret = shell.su(commands);
         if (isValidShellResponse(ret)) {
             return ret.get(0);
         }