1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
# 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;
snapshotDir = "/srv/last_snapshot";
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;
};
backupMountPoint = lib.mkOption {
type = lib.types.path;
description = "The path where to expect the mounted backup disk";
default = "/mnt/backup";
};
};
};
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";
};
};
systemd.services = {
prepare-backup = {
requires = [];
after = [];
description = "Prepare a backup by snapshotting the system.";
serviceConfig = {
ExecStart = lib.getExe (pkgs.writeShellApplication {
name = "prepareBackup";
text = ''
set -x
[ -d "${snapshotDir}" ] && btrfs subvolume delete "${snapshotDir}"
# -r := Make the snapshot read-only
btrfs subvolume snapshot -r /srv "${snapshotDir}";
'';
inheritPath = false;
runtimeInputs = [
pkgs.btrfs-progs
];
});
Type = "oneshot";
User = "root";
Group = "root";
# TODO: Hardening <2025-05-04>
};
};
restic-backups-storagebox = lib.mkIf cfg.storagebox.enable {
requires = ["prepare-backup.service"];
after = ["prepare-backup.service"];
};
restic-backups-local = lib.mkIf cfg.local.enable {
requires = ["prepare-backup.service"];
after = ["prepare-backup.service"];
serviceConfig = {
ConditionPathIsDirectory = "${cfg.local.backupMountPoint}";
};
};
};
services.restic.backups = let
homeDir = "${snapshotDir}/home";
paths = [
snapshotDir
];
exclude = [
"${homeDir}/soispha/.cache"
];
extraBackupArgs = [
"--verbose=2"
];
in {
local = lib.mkIf cfg.local.enable {
inhibitsSleep = true;
initialize = true;
inherit paths exclude extraBackupArgs;
passwordFile = config.age.secrets.resticLocalRepositoryPassword.path;
repository = "${cfg.local.backupMountPoint}/restic-backup-data/";
# Start on demand.
timerConfig = null;
};
storagebox = lib.mkIf cfg.storagebox.enable {
inhibitsSleep = true;
initialize = true;
inherit paths exclude extraBackupArgs;
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;
};
};
# This is only for listing, pruning and such stuff.
storagebox-admin = lib.mkIf cfg.storagebox.enable {
inhibitsSleep = false;
initialize = false;
passwordFile = config.age.secrets.resticStorageboxRepositoryPassword.path;
extraOptions = [
"rclone.program='ssh -p 23 ${cfg.storagebox.user}@${cfg.storagebox.user}.your-storagebox.de 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 = null;
};
};
};
}
|
