nixos-config/modules/restic/system.nix

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{ pkgs, config, lib, ... }:
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let
cfg = config.sbruder.restic.system;
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repository = "s3:https://s3.eu-central-1.wasabisys.com/sbruder-restic";
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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
"/data/cache/"
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# Rust
"/home/*/**/target/debug/"
"/home/*/**/target/doc/"
"/home/*/**/target/release/"
"/home/*/**/target/rls/"
"/home/*/**/target/tarpaulin/"
"/home/*/**/target/wasm32-unknown-unknown/"
"/home/*/.rustup/toolchains/"
"/home/*/.cargo"
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# Misc
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"/home/*/mount"
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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" ''
. <(pass nixos/machines/${config.networking.hostName}/restic-s3 | sed 's/^/export /')
${pkgs.restic}/bin/restic \
--password-command="pass nixos/machines/${config.networking.hostName}/restic-password" \
--repo "${repository}" \
$@
'';
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in
{
options.sbruder.restic.system = {
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enable = lib.mkEnableOption "restic";
timerConfig = lib.mkOption {
type = with lib.types; attrsOf str;
default = {
OnCalendar = "20:00";
RandomizedDelaySec = "2h";
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};
};
extraPaths = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
example = [ "/data" ];
};
extraExcludes = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
};
uploadLimit = lib.mkOption {
type = lib.types.nullOr lib.types.int;
default = 1500;
};
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};
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config = lib.mkIf cfg.enable {
sops.secrets = {
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restic-password = { };
restic-s3 = { };
};
services.restic.backups.system = {
inherit repository;
inherit (cfg) timerConfig;
passwordFile = config.sops.secrets.restic-password.path;
s3CredentialsFile = config.sops.secrets.restic-s3.path;
paths = [
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"/etc"
"/home"
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"/root"
"/srv"
"/var"
] ++ cfg.extraPaths;
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initialize = true;
extraBackupArgs = [
"--exclude-caches"
"--exclude-file=${excludesFile}"
"--tag system"
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"--verbose"
] ++ lib.optional (cfg.uploadLimit != null) "--limit-upload=${toString cfg.uploadLimit}";
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};
systemd.services."restic-backups-system".serviceConfig = {
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"Nice" = 10;
"IOSchedulingClass" = "best-effort";
"IOSchedulingPriority" = 7;
};
environment.systemPackages = [
authScript
];
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};
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}