86 lines
2.5 KiB
Nix
86 lines
2.5 KiB
Nix
{ lib, config, pkgs, utils, ... }:
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let
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cfg = config.backup-helper;
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restic-wrapper = pkgs.writeShellApplication {
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name = "restic-wrapper";
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runtimeInputs = [
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pkgs.restic
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];
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text = ''
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# shellcheck disable=SC2031
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if [ -z "$BACKUP_HELPER_DIRS" ]; then
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echo "BACKUP_HELPER_DIRS is not set"
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exit 1;
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fi
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exit_code=0;
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for i in ''${BACKUP_HELPER_DIRS//,/ }; do
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echo "Starting backup of $i";
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output=$(restic backup "$i");
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if [ "$?" -ne 0 ]; then
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exit_code="$?";
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echo "Backup of $i failed with exit code $rc:"
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echo "$output"
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else
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echo "Backup of $i successful:"
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echo "$output"
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fi
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done
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exit "$exit_code";
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'';
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};
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in
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{
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options.backup-helper.enable = lib.mkEnableOption "Enable backup-helper";
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options.backup-helper = {
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restic-repository = lib.mkOption {
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type = lib.types.str;
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default = "rest:http://10.69.12.52:8000/backup-nix";
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description = "Repository to use for restic backup.";
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};
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backup-dirs = lib.mkOption {
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type = lib.types.listOf lib.types.str;
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default = [ ];
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description = "Directories to be backed up.";
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};
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schedule = lib.mkOption {
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type = lib.types.str;
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default = "*-*-* 00:00:00";
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description = "Schedule for backups. Needs to be valid systemd OnCalendar value.";
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};
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password-file = lib.mkOption {
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type = lib.types.nullOr lib.types.str;
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default = null;
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description = "File containing the restic password.";
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};
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randomized-delay = lib.mkOption {
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type = lib.types.int;
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default = 0;
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description = "Randomized delay in seconds to spread out backups.";
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};
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};
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config = lib.mkIf cfg.enable {
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systemd.services."backup-helper" = {
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after = [ "network-online.target" ];
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environment = {
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RESTIC_REPOSITORY = cfg.restic-repository;
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BACKUP_HELPER_DIRS = lib.strings.concatStringsSep "," cfg.backup-dirs;
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} // lib.attrsets.optionalAttrs (builtins.hasAttr "password-file" cfg) {
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RESTIC_PASSWORD_FILE = cfg.password-file;
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};
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${restic-wrapper}/bin/restic-wrapper";
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};
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};
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systemd.timers."backup-helper" = {
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timerConfig = {
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OnCalendar = cfg.schedule;
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Persistent = true;
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RandomizedDelaySec = cfg.randomized-delay;
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};
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wantedBy = [ "timers.target" ];
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};
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};
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}
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