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

72 lines
1.7 KiB
Nix

# 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"
"/etc/adjtime"
"/var/lib/systemd/timesync/clock"
]
++ lib.unique cfg.files
;
directories = [
"/etc/nixos" # In case it's storage directory of our configuration
"/var/log"
"/var/lib/nixos" # UID/GID maps
"/var/lib/systemd/coredump" # Coredumps
"/var/lib/systemd/coredump"
"/var/lib/systemd" # FIXME: needed?
"/var/spool" # FIXME: needed?
"/var/tmp" # FIXME: needed?
]
++ lib.unique cfg.directories
;
};
};
}