how to run sudo?

[GOLDCODERS CORP]

is it possible to run sudo command using this package?
i have an app that need to run sudo command.
Is there any documentation how we go about it for development and production?

[Alexandre Roux]

You can run your dart program using sudo to run all you child scripts as a super user.

Running a shell script with sudo from inside a dart script ran in non super user mode
is a little bit trickier as it requires user interaction. One solution (tried on Ubuntu) is to use
sudo --stdin to specify reading the password from the stdin.

You can then run script using the following:

await shell.run('sudo --stdin lsof -i:22');

A shared stdin object could be used to redirect dart program input to shell objects.

Here is a more complex example:

import 'package:process_run/shell.dart';

/// Only works on linux, list the process listening on port 22
void main(List<String> arguments) async {
  /// We have to use a shared stdin if we want to reuse it.
  var stdin = sharedStdIn;

  /// Use sudo --stdin to read the password from stdin
  /// Use an alias for simplicity (only need to refer to sudo instead of sudo --stdin)
  var env = ShellEnvironment()..aliases['sudo'] = 'sudo --stdin';
  var shell = Shell(
      stdin: sharedStdIn,
      // lsof return exitCode 1 if not found
      environment: env,
      throwOnError: false);

  await shell.run('sudo lsof -i:22');
  // second time should not ask for password
  await shell.run('sudo lsof -i:80');

  /// Stop shared stdin
  await stdin.terminate();
}

[GOLDCODERS CORP]

im using this one on flutter app, so passing in stdin isnt an option for me , user input would be coming from a form submittion.
on mac i can use osascript to invoke a gui prompt for sudo command.
on windows i havent tried but i think invoding runas on cmd will prompt for admin password gui
linux is a different thing, which might need extra gui apps depending on distro

[AndroidDesigner]

@alextekartik
I did not understand how do I have to give Linux sudo password to flutter app.
After running await shell.run('sudo --stdin lsof -i:22'); and typing sudo password, nothing happened.
Can you explain please?

[Alexandre Roux]

From flutter app, one solution is to use a custom stdin for you command. Something like:

import 'dart:io';

import 'package:http/http.dart';
import 'package:process_run/shell.dart';

void main(List<String> arguments) async {
  // Assuming you have the password in `pwd` variable
  var pwd = '__your_root_password__';

  // Use sudo --stdin to read the password from stdin
  // Use an alias for simplicity (only need to refer to sudo instead of sudo --stdin)
  // Also set an empty prompt here for demo purpose.
  var env = ShellEnvironment()..aliases['sudo'] = "sudo --stdin --prompt=''";

  // Create a fake stdin stream from the password variable
  var stdin =
      ByteStream.fromBytes(systemEncoding.encode(pwd)).asBroadcastStream();

  // Execute!
  var shell = Shell(stdin: stdin, environment: env);

  // Should not ask for password
  //await shell.run('sudo lsof -i:22');
  await shell.run('sudo whoami');
}