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home-manager/docs/manual/nix-flakes/prerequisites.md
2023-12-07 21:28:18 +09:00

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# Prerequisites {#sec-flakes-prerequisites}
- Install Nix 2.4 or later, or have it in `nix-shell`.
- Enable experimental features `nix-command` and `flakes`.
- When using NixOS, add the following to your `configuration.nix`
and rebuild your system.
``` nix
nix = {
package = pkgs.nixFlakes;
extraOptions = ''
experimental-features = nix-command flakes
'';
};
```
- If you are not using NixOS, add the following to `nix.conf`
(located at `~/.config/nix/` or `/etc/nix/nix.conf`).
``` bash
experimental-features = nix-command flakes
```
You may need to restart the Nix daemon with, for example,
`sudo systemctl restart nix-daemon.service`.
- Alternatively, you can enable flakes on a per-command basis with
the following additional flags to `nix` and `home-manager`:
``` shell
$ nix --extra-experimental-features "nix-command flakes" <sub-commands>
$ home-manager --extra-experimental-features "nix-command flakes" <sub-commands>
```
- Prepare your Home Manager configuration (`home.nix`).
Unlike the channel-based setup, `home.nix` will be evaluated when
the flake is built, so it must be present before bootstrap of Home
Manager from the flake. See [Configuration Example](#sec-usage-configuration) for
introduction about writing a Home Manager configuration.