Lua

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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Lua

local chilkat = require("chilkat")

-- 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.

local sftp = chilkat.SFtp.new()

-- Connect, authenticate, and initialize the SFTP subsystem.
local port = 22
local success = sftp:connect("sftp.example.com", port)
if not success then
    print(sftp.last_error_text)
    return
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.
local password = "mySshPassword"

success = sftp:authenticate_pw("mySshLogin", password)
if not success then
    print(sftp.last_error_text)
    return
end

success = sftp:initialize_sftp()
if not success then
    print(sftp.last_error_text)
    return
end

-- The 1st argument is a path, so isHandle is false.  Changing ownership typically requires
-- elevated privileges on the server.
local isHandle = false
success = sftp:set_owner_and_group("subdir/report.pdf", isHandle, "www-data", "www-data")
if not success then
    print(sftp.last_error_text)
    return
end

print("Owner and group set.")

sftp:disconnect()