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# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
{
lib,
config,
pkgs,
...
}: let
cfg = config.soispha.services.backup;
in {
options.soispha.services.backup = {
storagebox = {
enable = lib.mkEnableOption "remote backups";
user = lib.mkOption {
type = lib.types.str;
description = "The storagebox-user to use";
example = "u384702-sub2";
};
sshKey = lib.mkOption {
type = lib.types.path;
description = "The age-encrypted ssh-key, passed to agenix";
default = ./secrets/storagebox/ssh_key.age;
};
repositoryPassword = lib.mkOption {
type = lib.types.path;
description = "The age-encrypted restic password, passed to agenix";
default = ./secrets/storagebox/repository_password.age;
};
};
local = {
enable = lib.mkEnableOption "local backups";
repositoryPassword = lib.mkOption {
type = lib.types.path;
description = "The age-encrypted restic password, passed to agenix";
default = ./secrets/local/repository_password.age;
};
backupDiskUuid = lib.mkOption {
example = lib.literalExpression "d1d20ae7-3d8a-44da-86da-677dbbb10c89";
description = "The UUID of the backup disk";
};
};
};
config = {
age.secrets = {
resticStorageboxSshKey = lib.mkIf cfg.storagebox.enable {
file = cfg.storagebox.sshKey;
mode = "0700";
owner = "root";
group = "root";
};
resticStorageboxRepositoryPassword = lib.mkIf cfg.storagebox.enable {
file = cfg.storagebox.repositoryPassword;
mode = "0700";
owner = "root";
group = "root";
};
resticLocalRepositoryPassword = lib.mkIf cfg.local.enable {
file = cfg.local.repositoryPassword;
mode = "0700";
owner = "root";
group = "root";
};
};
soispha.programs.ssh = lib.mkIf cfg.storagebox.enable {
enable = true;
rootKnownHosts = {
"[u459143-sub1.your-storagebox.de]:23" = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIICf9svRenC/PLKIL9nk6K/pxQgoiFC41wTNvoIncOxs";
};
};
services.restic.backups = let
snapshotDir = "/srv/last_snapshot";
homeDir = "${snapshotDir}/home";
paths = [
snapshotDir
];
exclude = [
"${homeDir}/soispha/.cache"
];
extraBackupArgs = [
"--verbose=2"
];
backupPrepareCommand = extra:
# bash
extra
+ ''
[ -d "${snapshotDir}" ] && ${lib.getExe' pkgs.btrfs-progs "btrfs"} subvolume delete "${snapshotDir}"
# -r := Make the snapshot read-only
${lib.getExe' pkgs.btrfs-progs "btrfs"} subvolume snapshot -r /srv "${snapshotDir}";
'';
in {
local = let
backupMountPoint = "/run/media/${cfg.local.backupDiskUuid}";
in
lib.mkIf cfg.local.enable {
inhibitsSleep = true;
initialize = true;
inherit paths exclude extraBackupArgs;
# TODO: We could maybe use systemd's built-in system for this mounting. <2025-05-01>
backupPrepareCommand =
backupPrepareCommand
# bash
''
set -xeu
${lib.getExe' pkgs.util-linux "mount"} --mkdir "/dev/disk/by-uuid/${cfg.local.backupDiskUuid}" "${backupMountPoint}"
'';
backupCleanupCommand =
# bash
''
${lib.getExe' pkgs.util-linux "umount"} "${backupMountPoint}"
'';
passwordFile = config.age.secrets.resticLocalRepositoryPassword.path;
repository = "${backupMountPoint}/restic-backup-data/";
# Start on demand.
timerConfig = null;
};
storagebox = lib.mkIf cfg.storagebox.enable {
inhibitsSleep = true;
initialize = true;
inherit paths exclude extraBackupArgs;
backupPrepareCommand = backupPrepareCommand "";
passwordFile = config.age.secrets.resticStorageboxRepositoryPassword.path;
extraOptions = [
"rclone.program='ssh -p 23 ${cfg.storagebox.user}@${cfg.storagebox.user}.your-storagebox.de -i ${config.age.secrets.resticStorageboxSshKey.path} command_forced_on_remote'"
];
# This setting is normally passed to rclone, but we force
# the command on the remote.
# As such, the value does not matter and must only be parseable by restic.
repository = "rclone: ";
timerConfig = {
Requires = "network-online.target";
OnActiveSec = "30m";
OnUnitInactiveSec = "2h";
Persistent = true;
};
};
};
};
}
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