Objective-C

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.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoSFtp.h>
#import <NSString.h>

BOOL success = NO;

//  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.

CkoSFtp *sftp = [[CkoSFtp alloc] init];

//  Connect, authenticate, and initialize the SFTP subsystem.
int port = 22;
success = [sftp Connect: @"sftp.example.com" port: [NSNumber numberWithInt: port]];
if (success == NO) {
    NSLog(@"%@",sftp.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.
NSString *password = @"mySshPassword";

success = [sftp AuthenticatePw: @"mySshLogin" password: password];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

success = [sftp InitializeSftp];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

//  The 1st argument is a path, so isHandle is false.  Changing ownership typically requires
//  elevated privileges on the server.
BOOL isHandle = NO;
success = [sftp SetOwnerAndGroup: @"subdir/report.pdf" bIsHandle: isHandle owner: @"www-data" group: @"www-data"];
if (success == NO) {
    NSLog(@"%@",sftp.LastErrorText);
    return;
}

NSLog(@"%@",@"Owner and group set.");

[sftp Disconnect];