nixos-config/services/restic-backup.nix

90 lines
2 KiB
Nix

{ config, lib, pkgs, ... }:
let
inherit (lib)
attrsets
concatStringsSep
mkEnableOption
mkIf
mkOption
optional
;
cfg = config.my.services.restic-backup;
secrets = config.my.secrets;
excludeArg = "--exclude-file=" + (pkgs.writeText "excludes.txt" (concatStringsSep "\n" cfg.exclude));
makePruneOpts = pruneOpts:
attrsets.mapAttrsToList (name: value: "--keep-${name} ${toString value}") pruneOpts;
in {
options.my.services.restic-backup = let inherit (lib) types; in {
enable = mkEnableOption "Enable Restic backups for this host";
repo = mkOption {
type = types.str;
default = null;
example = "/mnt/hdd";
description = "Restic backup repo";
};
paths = mkOption {
type = types.listOf types.str;
default = [ ];
example = [
"/var/lib"
"/home"
];
description = "Paths to backup";
};
exclude = mkOption {
type = types.listOf types.str;
default = [ ];
example = [
# very large paths
"/var/lib/docker"
"/var/lib/systemd"
"/var/lib/libvirt"
# temporary files created by `cargo` and `go build`
"**/target"
"/home/*/go/bin"
"/home/*/go/pkg"
];
description = "Paths to exclude from backup";
};
prune = mkOption {
type = types.attrs;
default = {
daily = 7;
weekly = 4;
monthly = 6;
};
};
};
config = mkIf cfg.enable {
environment.systemPackages = [ pkgs.restic ];
services.restic.backups.backblaze = {
initialize = true;
paths = cfg.paths;
repository = cfg.repo;
passwordFile = "/root/restic/password";
environmentFile = "/root/restic/creds";
extraBackupArgs = [ "--verbose=2" ]
++ optional (builtins.length cfg.exclude != 0) excludeArg;
timerConfig = {
OnCalendar = "daily";
};
pruneOpts = makePruneOpts cfg.prune;
};
};
}