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path: root/hosts/vidhar/borg/default.nix
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{ config, pkgs, lib, flakeInputs, ... }:

with lib;

let
  sshConfig = ''
    Include /etc/ssh/ssh_config

    ControlMaster auto
    ControlPath /var/lib/borg/.borgssh-master-%r@%n:%p
    ControlPersist yes

    Host yggdrasil.borgbase
      HostName nx69hpl8.repo.borgbase.com
      User nx69hpl8
      IdentityFile ${config.sops.secrets."append.borgbase".path}
      IdentitiesOnly yes

      BatchMode yes
      ServerAliveInterval 10
      ServerAliveCountMax 30
  '';

  copyService = { repo, repoEscaped }: let
    serviceName = "copy-borg@${repoEscaped}";
  in nameValuePair serviceName {
    serviceConfig = {
      Type = "oneshot";
      ExecStart = "${copyBorg}/bin/copy_borg --verbosity 3 ${escapeShellArg repo} yggdrasil.borgbase:repo";
      TimeoutStartSec = "8h";
      # User = "borg";
      # Group = "borg";
      # StateDirectory = "borg";
      RuntimeDirectory = "copy-borg";
      Environment = [
        "BORG_RSH=\"${pkgs.openssh}/bin/ssh -F ${pkgs.writeText "config" sshConfig}\""
        "BORG_BASE_DIR=/var/lib/borg"
        "BORG_CONFIG_DIR=/var/lib/borg/config"
        "BORG_CACHE_DIR=/var/lib/borg/cache"
        "BORG_SECURITY_DIR=/var/lib/borg/security"
        "BORG_KEYS_DIR=/var/lib/borg/keys"
        "BORG_KEY_FILE=${config.sops.secrets."yggdrasil.borgkey".path}"
        "BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK=yes"
        "BORG_HOSTNAME_IS_UNIQUE=yes"
      ];

      LogRateLimitIntervalSec = 0;
    };
  };

  copyBorg = flakeInputs.mach-nix.lib.${config.nixpkgs.system}.buildPythonPackage rec {
    pname = "copy-borg";
    src = ./copy;
    version = "0.0.0";
    ignoreDataOutdated = true;

    requirements = ''
      humanize
      tqdm
      python-dateutil
      xdg
      python-unshare
      pyprctl
      halo
    '';
    postInstall = ''
      wrapProgram $out/bin/copy_borg \
        --prefix PATH : ${makeBinPath (with pkgs; [util-linux borgbackup])}:${config.security.wrapperDir}
    '';

    providers.python-unshare = "nixpkgs";
    overridesPre = [
      (self: super: { python-unshare = super.python-unshare.overrideAttrs (oldAttrs: { name = "python-unshare-0.2.1"; version = "0.2.1"; }); })
    ];

    # _.tomli.buildInputs.add = with pkgs."python3Packages"; [ flit-core ];
  };
in {
  config = {
    services.borgsnap = {
      enable = true;

      target = "yggdrasil.borgbase:repo";
      inherit sshConfig;
      keyfile = config.sops.secrets."yggdrasil.borgkey".path;
    };

    systemd.services = listToAttrs (map copyService [{ repo = "/srv/backup/borg/jotnar"; repoEscaped = "srv-backup-borg-jotnar"; }]);

    services.borgbackup.repos.jotnar = {
      path = "/srv/backup/borg/jotnar";
      authorizedKeysAppendOnly = let
        dir = ./jotnar;
        toAuthKey = fname: ftype: if ftype != "regular" || !(hasSuffix ".pub" fname) then null else builtins.readFile (dir + "/${fname}");
      in filter (v: v != null) (mapAttrsToList toAuthKey (builtins.readDir dir));
    };

    boot.postBootCommands = mkBefore ''
      ${pkgs.findutils}/bin/find /srv/backup/borg -type d -empty -delete
    '';

    users.users.borg.extraGroups = ["ssh"];

    services.openssh.extraConfig = ''
      Match User borg
        ClientAliveInterval 10
        ClientAliveCountMax 30

      Match All
    '';

    sops.secrets."append.borgbase" = {
      format = "binary";
      sopsFile = ./append.borgbase;
      owner = "borg";
      group = "borg";
      mode = "0400";
    };
    sops.secrets."yggdrasil.borgkey" = {
      format = "binary";
      sopsFile = ./yggdrasil.borgkey;
      owner = "borg";
      group = "borg";
      mode = "0400";
    };

    systemd.timers."copy-borg@srv-backup-borg-jotnar" = {
      wantedBy = ["multi-user.target"];

      timerConfig = {
        OnCalendar = "*-*-* 00/4:00:00 Europe/Berlin";
      };
    };
  };
}