Swift

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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func chilkatTest() {
    var success: Bool = 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.

    let sftp = CkoSFtp()!

    //  Connect, authenticate, and initialize the SFTP subsystem.
    var port: Int = 22
    success = sftp.connect(hostname: "sftp.example.com", port: port)
    if success == false {
        print("\(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.
    var password: String? = "mySshPassword"

    success = sftp.authenticatePw(login: "mySshLogin", password: password)
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    success = sftp.initializeSftp()
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    //  The 1st argument is a path, so isHandle is false.  Changing ownership typically requires
    //  elevated privileges on the server.
    var isHandle: Bool = false
    success = sftp.setOwnerAndGroup(pathOrHandle: "subdir/report.pdf", bIsHandle: isHandle, owner: "www-data", group: "www-data")
    if success == false {
        print("\(sftp.lastErrorText!)")
        return
    }

    print("Owner and group set.")

    sftp.disconnect()

}