webui: support mount master mode

js/README.md

@@ -16,6 +16,7 @@ Spawns a **root** shell and runs a command within that shell, passing the `stdou
 - `options` `<Object>`
   - `cwd` - Current working directory of the child process
   - `env` - Environment key-value pairs
+  - `mm` `boolean` - Mount master mode, true to enter global mount namespace
 
 ```javascript
 import { exec } from 'kernelsu';
@@ -38,6 +39,7 @@ Returns a `ChildProcess`, Instances of the ChildProcess represent spawned child
 - `options` `<Object>`:
   - `cwd` `<string>` - Current working directory of the child process
   - `env` `<Object>` - Environment key-value pairs
+  - `mm` `boolean` - Mount master mode, true to enter global mount namespace
 
 Example of running `ls -lh /data`, capturing `stdout`, `stderr`, and the exit code:
 

manager/app/src/main/java/me/weishu/kernelsu/ui/webui/WebViewInterface.kt

@@ -36,7 +36,7 @@ class WebViewInterface(val context: Context, private val webView: WebView) {
         exec(cmd, null, callbackFunc)
     }
 
-    private fun processOptions(sb: StringBuilder, options: String?) {
+    private fun processOptions(sb: StringBuilder, options: String?): JSONObject {
         val opts = if (options == null) JSONObject() else {
             JSONObject(options)
         }
@@ -51,6 +51,7 @@ class WebViewInterface(val context: Context, private val webView: WebView) {
                 sb.append("export ${key}=${env.getString(key)};")
             }
         }
+        return opts
     }
 
     @JavascriptInterface
@@ -60,10 +61,11 @@ class WebViewInterface(val context: Context, private val webView: WebView) {
         callbackFunc: String
     ) {
         val finalCommand = StringBuilder()
-        processOptions(finalCommand, options)
+        val opts = processOptions(finalCommand, options)
         finalCommand.append(cmd)
 
-        val shell = createRootShell()
+        val mountMaster = opts.optBoolean("mm", false)
+        val shell = createRootShell(mountMaster)
         val result = shell.newJob().add(finalCommand.toString()).to(ArrayList(), ArrayList()).exec()
         val stdout = result.out.joinToString(separator = "\n")
         val stderr = result.err.joinToString(separator = "\n")
@@ -83,7 +85,7 @@ class WebViewInterface(val context: Context, private val webView: WebView) {
     fun spawn(command: String, args: String, options: String?, callbackFunc: String) {
         val finalCommand = StringBuilder()
 
-        processOptions(finalCommand, options)
+        val opts = processOptions(finalCommand, options)
 
         if (!TextUtils.isEmpty(args)) {
             finalCommand.append(command).append(" ")
@@ -97,7 +99,8 @@ class WebViewInterface(val context: Context, private val webView: WebView) {
             finalCommand.append(command)
         }
 
-        val shell = createRootShell()
+        val mountMaster = opts.optBoolean("mm", false)
+        val shell = createRootShell(mountMaster)
 
         val emitData = fun(name: String, data: String) {
             val jsCode =