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# Configure restic backups to Google Cloud Storage.
#
# Conventions: Restic state is kept in /var/backup/restic, with
# secrets in /var/backup/restic/secret.
{ config, lib, pkgs, ... }:
let
cfg = config.services.depot.restic;
description = "Restic backups to GCS";
mkStringOption = default: lib.mkOption {
inherit default;
type = lib.types.str;
};
in {
options.services.depot.restic = {
enable = lib.mkEnableOption description;
project = mkStringOption "tazjins-infrastructure";
credentialPath = mkStringOption "/var/backup/restic/gcp-key.json";
repository = mkStringOption "gs:tvl-fyi-backups:/whitby";
interval = mkStringOption "hourly";
paths = with lib; mkOption {
description = "Directories that should be backed up";
type = types.listOf types.str;
};
exclude = with lib; mkOption {
description = "Files that should be excluded from backups";
type = types.listOf types.str;
};
};
config = lib.mkIf cfg.enable {
# Regularly back up whitby to Google Cloud Storage.
systemd.services.restic = {
description = "Backups to Google Cloud Storage";
script = "${pkgs.restic}/bin/restic backup ${lib.concatStringsSep " " cfg.paths}";
environment = {
GOOGLE_PROJECT_ID = cfg.project;
GOOGLE_APPLICATION_CREDENTIALS = cfg.credentialPath;
RESTIC_REPOSITORY = cfg.repository;
RESTIC_PASSWORD_FILE = "/var/backup/restic/secret";
RESTIC_CACHE_DIR = "/var/backup/restic/cache";
RESTIC_EXCLUDE_FILE =
builtins.toFile "exclude-files" (lib.concatStringsSep "\n" cfg.exclude);
};
};
systemd.timers.restic = {
wantedBy = [ "multi-user.target" ];
timerConfig.OnCalendar = cfg.interval;
};
};
}
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