# Sudo Module

- [`Config`](https://docs.rs/pallet-sudo/latest/pallet_sudo/pallet/trait.Config.html)
- [`Call`](https://docs.rs/pallet-sudo/latest/pallet_sudo/pallet/enum.Call.html)

## Overview

The Sudo module allows for a single account (called the "sudo key")
to execute dispatchable functions that require a `Root` call
or designate a new account to replace them as the sudo key.
Only one account can be the sudo key at a time.

## Interface

### Dispatchable Functions

Only the sudo key can call the dispatchable functions from the Sudo module.

- `sudo` - Make a `Root` call to a dispatchable function.
- `set_key` - Assign a new account to be the sudo key.

## Usage

### Executing Privileged Functions

The Sudo module itself is not intended to be used within other modules.
Instead, you can build "privileged functions" (i.e. functions that require `Root` origin) in other modules.
You can execute these privileged functions by calling `sudo` with the sudo key account.
Privileged functions cannot be directly executed via an extrinsic.

Learn more about privileged functions and `Root` origin in the [`Origin`] type documentation.

### Simple Code Snippet

This is an example of a module that exposes a privileged function:

```rust
#[frame_support::pallet]
pub mod pallet {
    use super::*;
    use frame_support::pallet_prelude::*;
    use frame_system::pallet_prelude::*;

    #[pallet::pallet]
    pub struct Pallet<T>(_);

    #[pallet::config]
    pub trait Config: frame_system::Config {}

    #[pallet::call]
    impl<T: Config> Pallet<T> {
        #[pallet::weight(0)]
        pub fn privileged_function(origin: OriginFor<T>) -> DispatchResult {
            ensure_root(origin)?;

            // do something...

            Ok(())
        }
    }
}
```

## Genesis Config

The Sudo module depends on the [`GenesisConfig`](https://docs.rs/pallet-sudo/latest/pallet_sudo/struct.GenesisConfig.html).
You need to set an initial superuser account as the sudo `key`.

## Related Modules

- [Democracy](https://docs.rs/pallet-democracy/latest/pallet_democracy/)

[`Call`]: ./enum.Call.html
[`Config`]: ./trait.Config.html
[`Origin`]: https://docs.substrate.io/main-docs/build/origins/

License: Apache-2.0
