nixConfig/nixos/modules/impermanence.nix

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{lib, config, ...} :
let
inherit (lib)
mkEnableOption
mkIf
mkOption
types
;
cfg = config.impermanence;
in
{
imports = [ ];
options.impermanence = {
enable = mkEnableOption "impermanence";
storagePath = mkOption {
type = types.path;
default = "/persist";
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description = "The path where persistent data is stored";
};
name = mkOption {
type = types.str;
default = "persist";
description = "the name of the persistent data store";
};
};
config = mkIf cfg.enable {
environment.persistence.${cfg.name} = {
persistentStoragePath = cfg.storagePath;
directories = [
"/var/log"
"/var/lib/nixos"
];
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files = [
"/etc/ssh/ssh_host_ed25519_key"
"/etc/ssh/ssh_host_ed25519_key.pub"
"/etc/ssh/ssh_host_rsa_key"
"/etc/ssh/ssh_host_rsa_key.pub"
];
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};
environment.etc.machine-id.source = "${cfg.storagePath}/machine-id";
};
}