Dart

Set a Remote File's Owner and Group

Demonstrates the Chilkat SFtp.SetOwnerAndGroup method, which sets the owner and group of a remote item. The arguments are the remote path (or handle), whether the first argument is a handle, and the new owner and group values.

Background: This is the SFTP equivalent of chown. Changing ownership is a privileged operation on Unix systems — ordinary users generally cannot give their files away — so expect it to fail unless the authenticated account has the necessary rights. It is most often used by administrative jobs that upload files which must then belong to a service account, such as a web server user.

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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the SFtp.SetOwnerAndGroup method, which sets the owner and group of a remote item.
  // The 1st argument is the remote path (or handle), the 2nd (isHandle) indicates which, and the
  // 3rd and 4th are the new owner and group.

  final sftp = CkSFtp();

  // Connect, authenticate, and initialize the SFTP subsystem.
  final port = 22;
  try {
    sftp.connect('sftp.example.com', port);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Normally you would not hard-code the password in source.  You should instead obtain it
  // from an interactive prompt, environment variable, or a secrets vault.
  final password = 'mySshPassword';

  try {
    sftp.authenticatePw('mySshLogin', password);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    sftp.initializeSftp();
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // The 1st argument is a path, so isHandle is false.  Changing ownership typically requires
  // elevated privileges on the server.
  final isHandle = false;
  try {
    sftp.setOwnerAndGroup('subdir/report.pdf', isHandle, 'www-data', 'www-data');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Owner and group set.');

  sftp.disconnect();
}