120 lines
3.5 KiB
Nix
120 lines
3.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with import <stockholm/lib>;
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{
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options.lass.restic = mkOption {
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type = types.attrsOf (types.submodule ({ config, ... }: {
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options = {
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name = mkOption {
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type = types.str;
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default = config._module.args.name;
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};
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passwordFile = mkOption {
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type = types.str;
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default = toString <secrets/restic-password>;
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description = ''
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read the repository password from a file.
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'';
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example = "/etc/nixos/restic-password";
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};
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repo = mkOption {
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type = types.str;
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default = "sftp:backup@prism.r:/backups/${config.name}";
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description = ''
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repository to backup to.
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'';
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example = "sftp:backup@192.168.1.100:/backups/${config.name}";
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};
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dirs = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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which directories to backup.
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'';
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example = [
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"/var/lib/postgresql"
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"/home/user/backup"
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];
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};
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timerConfig = mkOption {
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type = types.attrsOf types.str;
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default = {
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OnCalendar = "daily";
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};
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description = ''
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When to run the backup. See man systemd.timer for details.
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'';
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example = {
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OnCalendar = "00:05";
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RandomizedDelaySec = "5h";
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};
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};
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user = mkOption {
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type = types.str;
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default = "root";
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description = ''
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As which user the backup should run.
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'';
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example = "postgresql";
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};
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extraArguments = mkOption {
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type = types.listOf types.str;
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default = [];
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description = ''
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Extra arguments to append to the restic command.
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'';
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example = [
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"sftp.command='ssh backup@192.168.1.100 -i /home/user/.ssh/id_rsa -s sftp"
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];
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};
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initialize = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Create the repository if it doesn't exist.
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'';
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};
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};
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}));
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default = {};
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};
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config = {
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systemd.services =
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mapAttrs' (_: plan:
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let
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extraArguments = concatMapStringsSep " " (arg: "-o ${arg}") plan.extraArguments;
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connectTo = elemAt (splitString ":" plan.repo) 1;
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resticCmd = "${pkgs.restic}/bin/restic ${extraArguments}";
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in nameValuePair "backup.${plan.name}" {
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environment = {
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RESTIC_PASSWORD_FILE = plan.passwordFile;
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RESTIC_REPOSITORY = plan.repo;
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};
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path = with pkgs; [
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openssh
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];
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restartIfChanged = false;
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serviceConfig = {
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ExecStartPre = mkIf plan.initialize (pkgs.writeScript "rustic-${plan.name}-init" ''
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#! ${pkgs.bash}/bin/bash
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${resticCmd} snapshots || ${resticCmd} init
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'');
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ExecStart = pkgs.writeDash "rustic-${plan.name}" (
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"#! ${pkgs.bash}/bin/bash\n" +
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concatMapStringsSep "\n" (dir: "${resticCmd} backup ${dir}") plan.dirs
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);
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User = plan.user;
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};
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}
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) config.lass.restic;
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systemd.timers =
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mapAttrs' (_: plan: nameValuePair "backup.${plan.name}" {
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wantedBy = [ "timers.target" ];
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timerConfig = plan.timerConfig;
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}) config.lass.restic;
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};
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}
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