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# Configure restic backups to S3-compatible storage, in our case
# GleSYS object storage.
#
# Conventions:
# - restic's cache lives in /var/backup/restic/cache
# - repository password lives in /var/backup/restic/secret
# - object storage credentials in /var/backup/restic/glesys-key
{ config, lib, pkgs, ... }:
let
cfg = config.services.depot.restic;
description = "Restic backups to GleSYS";
mkStringOption = default: lib.mkOption {
inherit default;
type = lib.types.str;
};
in
{
options.services.depot.restic = {
enable = lib.mkEnableOption description;
bucketEndpoint = mkStringOption "objects.dc-sto1.glesys.net";
bucketName = mkStringOption "aged-resonance";
bucketCredentials = mkStringOption "/var/backup/restic/glesys-key";
repository = mkStringOption config.networking.hostName;
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 {
systemd.services.restic = {
description = "Backups to GleSYS";
script = "${pkgs.restic}/bin/restic backup ${lib.concatStringsSep " " cfg.paths}";
environment = {
RESTIC_REPOSITORY = "s3:${cfg.bucketEndpoint}/${cfg.bucketName}/${cfg.repository}";
AWS_SHARED_CREDENTIALS_FILE = cfg.bucketCredentials;
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;
};
environment.systemPackages = [ pkgs.restic ];
};
}
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