nix-config/modules/nixos/system/persist/default.nix

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# Ephemeral root configuration
{ config, inputs, lib, ... }:
let
cfg = config.my.system.persist;
in
{
imports = [
inputs.impermanence.nixosModules.impermanence
];
options.my.system.persist = with lib; {
enable = mkEnableOption "stateless system configuration";
mountPoint = lib.mkOption {
type = types.str;
default = "/persistent";
example = "/etc/nix/persist";
description = ''
Which mount point should be used to persist this system's files and
directories.
'';
};
files = lib.mkOption {
type = with types; listOf str;
default = [ ];
example = [
"/etc/nix/id_rsa"
];
description = ''
Additional files in the root to link to persistent storage.
'';
};
directories = lib.mkOption {
type = with types; listOf str;
default = [ ];
example = [
"/var/lib/libvirt"
];
description = ''
Additional directories in the root to link to persistent storage.
'';
};
};
config = lib.mkIf cfg.enable {
environment.persistence."${cfg.mountPoint}" = {
files = [
"/etc/machine-id"
]
++ cfg.files
;
directories = [
"/etc/nixos"
"/var/log"
"/var/lib/systemd/coredump"
]
++ (lib.optionals config.virtualisation.docker.enable [
"/var/lib/docker"
])
++ cfg.directories
;
};
};
}