90 lines
2 KiB
Nix
90 lines
2 KiB
Nix
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{ config, lib, pkgs, ... }:
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with lib;
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let
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escape = escapeShellArg;
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cfg = config.rbackup;
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start = name: plan:
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let
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login-name = "root";
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identity = plan.sshKeyPath;
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ssh = "ssh -i ${escape identity}";
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in
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pkgs.writers.writeBash "backup.${name}" ''
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set -efu
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rsync_src=${escape plan.src}
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rsync_dst=${escape plan.dst}
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echo >&2 "update snapshot current; $rsync_dst <- $rsync_src"
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rsync \
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--rsh=${escape ssh} \
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--append -avz \
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--delete \
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"$rsync_src/" \
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"$rsync_dst"
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'';
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in
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{
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options.rbackup = {
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plans = mkOption {
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default = { };
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type = types.attrsOf
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(types.submodule ({ config, ... }: {
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options = {
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sshKeyPath = mkOption {
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type = types.str;
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};
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src = mkOption {
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type = types.str;
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};
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dst = mkOption {
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type = types.str;
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};
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startAt = mkOption {
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default = "hourly";
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type = with types; nullOr str; # TODO systemd.time(7)'s calendar event
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};
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timerConfig = mkOption {
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type = with types; attrsOf str;
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default = optionalAttrs (config.startAt != null) {
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OnCalendar = config.startAt;
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};
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};
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};
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}));
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};
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};
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config = {
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systemd.services =
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mapAttrs'
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(name: plan: nameValuePair "rbackup.${name}" {
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path = with pkgs; [
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coreutils
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gnused
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openssh
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rsync
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util-linux
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];
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restartIfChanged = false;
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serviceConfig = rec {
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ExecStart = start name plan;
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SyslogIdentifier = ExecStart.name;
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Type = "oneshot";
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};
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})
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cfg.plans;
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systemd.timers = mapAttrs'
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(name: plan: nameValuePair "rbackup.${name}" {
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wantedBy = [ "timers.target" ];
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timerConfig = plan.timerConfig;
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})
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cfg.plans;
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};
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}
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