Delphi DLL

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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Delphi DLL

var
success: Boolean;
sftp: HCkSFtp;
port: Integer;
password: PWideChar;
isHandle: Boolean;

begin
success := False;

//  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.

sftp := CkSFtp_Create();

//  Connect, authenticate, and initialize the SFTP subsystem.
port := 22;
success := CkSFtp_Connect(sftp,'sftp.example.com',port);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  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.
password := 'mySshPassword';

success := CkSFtp_AuthenticatePw(sftp,'mySshLogin',password);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

success := CkSFtp_InitializeSftp(sftp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;

//  The 1st argument is a path, so isHandle is 0.  Changing ownership typically requires
//  elevated privileges on the server.
isHandle := False;
success := CkSFtp_SetOwnerAndGroup(sftp,'subdir/report.pdf',isHandle,'www-data','www-data');
if (success = False) then
  begin
    Memo1.Lines.Add(CkSFtp__lastErrorText(sftp));
    Exit;
  end;
Memo1.Lines.Add('Owner and group set.');

CkSFtp_Disconnect(sftp);

CkSFtp_Dispose(sftp);