helm/modules/nixos/backup.nix

# TODO: 
# This currently works on a per host basis, and the host file has to define all the locations it wants to back up.
# Ideally, this would create a job for each profile instead, so the backup strategy is included in the profile regardless of host
{ config, lib, pkgs, ... }:
with lib;
let
  cfg = config.mossnet.backup;
in
{
  options = {
    mossnet.backup = {
      enable = mkEnableOption "Backup module using borg for Anish's computer nursery";
      name = lib.mkOption {
        type = types.str;
        default = { };
        example = literalExample ''
          mossnet
        '';
        description = ''
          name for the backup operator
        '';
      };
      paths = lib.mkOption {
        type = with types; listOf str;
        default = { };
        example = literalExample ''
          [ "/home/anish/usr" ];
        '';
        description = ''
          A list of folders to backup
        '';
      };
    };
  };

  config = mkIf cfg.enable {
    services.borgbackup.jobs = {
      "${cfg.name}" = {
        paths = cfg.paths;
        doInit = true;
        repo = "20779@hk-s020.rsync.net:${cfg.name}";
        encryption = {
          mode = "repokey-blake2";
          passCommand = "cat /run/agenix/borg-password";
        };
        environment = { BORG_RSH = "ssh -i /run/agenix/borg-key"; };
        compression = "auto,lzma";
        startAt = "daily";
        extraArgs = "--remote-path=borg1";
      };
    };
  };
}