nixos-config/modules/restic/system.nix

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# SPDX-FileCopyrightText: 2020-2023 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
{ pkgs, config, lib, ... }:
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let
cfg = config.sbruder.restic.system;
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sftpTarget = "u313368-sub4@u313368-sub4.your-storagebox.de";
sftpPort = 23;
repository = "sftp://${sftpTarget}:${toString sftpPort}/personal";
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excludes = [
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# Caches
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"/home/*/Downloads/"
"/home/*/.cache/"
"/home/*/**/cache/"
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"/home/*/.local/share/Trash" # some gui applications use it
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"/root/.cache"
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"/data/cache/"
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"/var/cache/"
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# Rust
"/home/*/.rustup/toolchains/"
"/home/*/.cargo"
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# Misc
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"/home/*/mount"
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"/home/*/mounts"
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# Docker (state should be kept somewhere else)
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"/var/lib/docker/"
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# Static configuration (generated from this repository)
"/etc/static/"
] ++ cfg.extraExcludes;
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excludesFile = pkgs.writeText "excludes.txt" (lib.concatStringsSep "\n" excludes);
# script to use restic as user without dealing with authentication
authScript = pkgs.writeShellScriptBin "restic-auth" ''
${pkgs.restic}/bin/restic \
--password-command="pass data/backup/restic-nixos" \
--repo "${repository}" \
$@
'';
# HACK: NixOS nftables implementation runs nft -c inside the build sandbox,
# where the target hosts cgroups are not available,
# and therefore fails.
# This is there to allow my home router to put backup traffic into the right qdisc,
# as the ip address and port are also used for other things.
# This is somewhat of an abuse of the DSCP mark.
qosRules = pkgs.writeText "restic-qos.nft" ''
table inet restic
delete table inet restic
table inet restic {
chain output {
type filter hook output priority mangle
ip version 4 socket cgroupv2 level 1 "restic.slice" ip dscp set af12 return
ip6 version 6 socket cgroupv2 level 1 "restic.slice" ip6 dscp set af12 return
}
}
'';
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in
{
options.sbruder.restic.system = {
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enable = lib.mkEnableOption "restic";
timerConfig = lib.mkOption {
type = with lib.types; attrsOf str;
default = {
OnCalendar = "18:00";
RandomizedDelaySec = "2h";
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};
};
extraPaths = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
example = [ "/data" ];
};
extraExcludes = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
};
uploadLimit = lib.mkOption {
type = lib.types.nullOr lib.types.int;
default = null;
};
qos = (lib.mkEnableOption "QoS marking (DSCP AF12) of outgoing packets") // { default = !(lib.isNull cfg.uploadLimit); };
prune = lib.mkEnableOption "pruning";
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};
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config = lib.mkIf cfg.enable {
sops.secrets = {
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restic-password = { };
restic-repository = { };
} // lib.optionalAttrs cfg.prune {
restic-ssh-key = {
sopsFile = ../../machines/${config.networking.hostName}/secrets.yaml;
};
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};
services.restic.backups.system = {
inherit (cfg) timerConfig;
repositoryFile = config.sops.secrets.restic-repository.path;
passwordFile = config.sops.secrets.restic-password.path;
paths = [
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"/etc"
"/home"
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"/root"
"/srv"
"/var"
] ++ cfg.extraPaths;
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extraBackupArgs = [
"--compression auto"
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"--exclude-caches"
"--exclude-file=${excludesFile}"
"--tag system"
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"--verbose"
] ++ lib.optional (cfg.uploadLimit != null) "--limit-upload=${toString cfg.uploadLimit}";
Upgrade to 23.11 Flake lock file updates: • Updated input 'bang-evaluator': 'git+https://git.sbruder.de/simon/bangs?ref=refs/heads/master&rev=7fc3d5019c907566abbad8f84ba9555a5786bd01' (2021-08-01) → 'git+https://git.sbruder.de/simon/bangs?ref=refs/heads/master&rev=a06c68c44862f74757a203e2df41ea83c33722d9' (2023-12-02) • Updated input 'home-manager': 'github:nix-community/home-manager/04bac349d585c9df38d78e0285b780a140dc74a4' (2023-11-12) → 'github:nix-community/home-manager/aeb2232d7a32530d3448318790534d196bf9427a' (2023-11-24) • Updated input 'home-manager-unstable': 'github:nix-community/home-manager/9a4725afa67db35cdf7be89f30527d745194cafa' (2023-11-19) → 'github:nix-community/home-manager/4a8545f5e737a6338814a4676dc8e18c7f43fc57' (2023-12-01) • Updated input 'nix-pre-commit-hooks': 'github:cachix/pre-commit-hooks.nix/e558068cba67b23b4fbc5537173dbb43748a17e8' (2023-11-15) → 'github:cachix/pre-commit-hooks.nix/e5ee5c5f3844550c01d2131096c7271cec5e9b78' (2023-11-25) • Updated input 'nixos-hardware': 'github:nixos/nixos-hardware/1721da31f9b30cbf4460c4ec5068b3b6174a4694' (2023-11-18) → 'github:nixos/nixos-hardware/8772491ed75f150f02552c60694e1beff9f46013' (2023-11-29) • Updated input 'nixpkgs': 'github:nixos/nixpkgs/9fb122519e9cd465d532f736a98c1e1eb541ef6f' (2023-11-16) → 'github:nixos/nixpkgs/5de0b32be6e85dc1a9404c75131316e4ffbc634c' (2023-12-01) • Updated input 'nixpkgs-overlay': 'git+https://git.sbruder.de/simon/nixpkgs-overlay?ref=refs/heads/master&rev=c8a17806a75733dec2ecdd8f0021c70d1f9dfc43' (2023-10-04) → 'git+https://git.sbruder.de/simon/nixpkgs-overlay?ref=refs/heads/master&rev=37f80d1593ab856372cc0da199f49565f3b05c71' (2023-12-02) • Updated input 'nixpkgs-overlay/poetry2nix': 'github:nix-community/poetry2nix/093383b3d7fdd36846a7d84e128ca11865800538' (2023-09-22) → 'github:nix-community/poetry2nix/7acb78166a659d6afe9b043bb6fe5cb5e86bb75e' (2023-12-01) • Updated input 'nixpkgs-overlay/poetry2nix/nix-github-actions': 'github:nix-community/nix-github-actions/165b1650b753316aa7f1787f3005a8d2da0f5301' (2023-07-09) → 'github:nix-community/nix-github-actions/4bb5e752616262457bc7ca5882192a564c0472d2' (2023-11-03) • Added input 'nixpkgs-overlay/poetry2nix/systems': 'github:nix-systems/default/da67096a3b9bf56a91d16901293e51ba5b49a27e' (2023-04-09) • Added input 'nixpkgs-overlay/poetry2nix/treefmt-nix': 'github:numtide/treefmt-nix/e82f32aa7f06bbbd56d7b12186d555223dc399d1' (2023-11-12) • Added input 'nixpkgs-overlay/poetry2nix/treefmt-nix/nixpkgs': follows 'nixpkgs-overlay/poetry2nix/nixpkgs' • Updated input 'nixpkgs-unstable': 'github:nixos/nixpkgs/c757e9bd77b16ca2e03c89bf8bc9ecb28e0c06ad' (2023-11-17) → 'github:nixos/nixpkgs/e92039b55bcd58469325ded85d4f58dd5a4eaf58' (2023-11-29) • Updated input 'sops-nix': 'github:Mic92/sops-nix/49a87c6c827ccd21c225531e30745a9a6464775c' (2023-11-19) → 'github:Mic92/sops-nix/e19071f9958c8da4f4347d3d78790d97e98ba22f' (2023-12-02) • Updated input 'sops-nix/nixpkgs-stable': 'github:NixOS/nixpkgs/decdf666c833a325cb4417041a90681499e06a41' (2023-11-18) → 'github:NixOS/nixpkgs/dfb95385d21475da10b63da74ae96d89ab352431' (2023-11-25)
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backupPrepareCommand = ''
${pkgs.nftables}/bin/nft -f ${qosRules}
'';
backupCleanupCommand = ''
${pkgs.nftables}/bin/nft delete table inet restic
'';
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};
systemd.services."restic-backups-system".serviceConfig = {
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"Nice" = 10;
"IOSchedulingClass" = "best-effort";
"IOSchedulingPriority" = 7;
Slice = "restic.slice";
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};
services.restic.backups.system-prune = lib.mkIf cfg.prune {
inherit repository;
passwordFile = config.sops.secrets.restic-password.path;
timerConfig = {
OnCalendar = "*-1/2-07 03:00:00";
RandomizedDelaySec = "4h";
};
paths = [ ];
extraOptions = [
"-o"
"sftp.command='ssh -i ${config.sops.secrets.restic-ssh-key.path} -p ${toString sftpPort} ${sftpTarget} -s sftp'"
];
pruneOpts = [
"--compression auto"
"--keep-daily 7"
"--keep-monthly 12"
"--keep-weekly 5"
"--keep-yearly 10"
"--tag system"
"--verbose"
] ++ lib.optional (cfg.uploadLimit != null) "--limit-upload=${toString cfg.uploadLimit}";
};
environment.systemPackages = [
authScript
];
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};
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}