Initializing a New Clan Project

Create a new Clan flake

To start a new project, execute the following command to add the clan cli to your shell:

$ nix shell git+https://git.clan.lol/clan/clan-core

Then use the following commands to initialize a new clan-flake:

$ mkdir ./my-flake
$ cd ./my-flake
$ clan create

This action will generate two primary files: flake.nix and .clan-flake.

$ ls -la
drwx------ joerg users   5 B  a minute ago   ./
drwxrwxrwt root  root  139 B  12 seconds ago ../
.rw-r--r-- joerg users  77 B  a minute ago   .clan-flake
.rw-r--r-- joerg users 4.8 KB a minute ago   flake.lock
.rw-r--r-- joerg users 242 B  a minute ago   flake.nix

Understanding the .clan-flake Marker File

The .clan-flake marker file serves an optional purpose: it helps the clan-cli utility locate the project's root directory. If .clan-flake is missing, clan-cli will instead search for other indicators like .git, .hg, .svn, or flake.nix to identify the project root.

Add your first machine

$ clan machines create my-machine
$ clan machines list
my-machine

configure your machine

In this example we crate a user named my-user that is allowed to login to the machine

$ clan config --machine my-machine users.users.my-user.hashedPassword $(mkpasswd)

Test your machine config inside a VM

$ nix build .#nixosConfigurations.my-machine.config.system.build.vm
...
$ ./result/bin/run-nixos-vm

Migrating Existing NixOS Configuration Flake

Absolutely, let's break down the migration step by step, explaining each action in detail:

Before You Begin

Backup Your Current Configuration: Always start by making a backup of your current NixOS configuration to ensure you can revert if needed.
```
cp -r /etc/nixos ~/nixos-backup
```
Update Flake Inputs: Add a new input for the clan-core dependency:
```
inputs.clan-core = {
  url = "git+https://git.clan.lol/clan/clan-core";
  # Don't do this if your machines are on nixpkgs stable.
  inputs.nixpkgs.follows = "nixpkgs";
};
```
- url: Specifies the Git repository URL for Clan Core.
- inputs.nixpkgs.follows: Tells Nix to use the same nixpkgs input as your main input (in this case, it follows nixpkgs).

Update Outputs: Then modify the outputs section of your flake.nix to adapt to Clan Core's new provisioning method. The key changes are as follows:

Add clan-core to the output

-  outputs = { self, nixpkgs,  }:
+  outputs = { self, nixpkgs, clan-core }:

Previous configuration:

{
    nixosConfigurations.example-desktop = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
            ./configuration.nix
        ];
        [...]
    };
}

After change:

let clan = clan-core.lib.buildClan {
    # this needs to point at the repository root
    directory = self;
    specialArgs = {};
    machines = {
        example-desktop = {
            nixpkgs.hostPlatform = "x86_64-linux";
            imports = [
                ./configuration.nix
            ];
        };
    };
};
in { inherit (clan) nixosConfigurations clanInternal; }

nixosConfigurations: Defines NixOS configurations, using Clan Core’s buildClan function to manage the machines.
Inside machines, a new machine configuration is defined (in this case, example-desktop).
Inside example-desktop which is the target machine hostname, nixpkgs.hostPlatform specifies the host platform as x86_64-linux.
clanInternals: Is required to enable evaluation of the secret generation/upload script on every architecture

Rebuild and Switch: Rebuild your NixOS configuration using the updated flake:
```
sudo nixos-rebuild switch --flake .
```
- This command rebuilds and switches to the new configuration. Make sure to include the --flake . argument to use the current directory as the flake source.
Test Configuration: Before rebooting, verify that your new configuration builds without errors or warnings.
Reboot: If everything is fine, you can reboot your system to apply the changes:
```
sudo reboot
```
Verify: After the reboot, confirm that your system is running with the new configuration, and all services and applications are functioning as expected.

By following these steps, you've successfully migrated your NixOS Flake configuration to include the clan-core input and adapted the outputs section to work with Clan Core's new machine provisioning method.

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