89 lines
2.8 KiB
Nix
89 lines
2.8 KiB
Nix
{pkgs, lib, ...}:
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let
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snapshotsDir = "/snapshots/home";
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in
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{
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environment.systemPackages = with pkgs; [
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restic
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btrbk
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libnotify
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];
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# btrbk systemd service and timer for daily home snapshots
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systemd.services.btrbk-home-snapshot = {
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description = "Create daily btrbk snapshot of the home subvolume";
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serviceConfig = {
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Type = "oneshot";
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User = "remy";
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ExecStartPre = "${lib.getExe pkgs.libnotify} \"Backup\" \"Creating BTRBK snapshot of /home.\"";
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# run the btrbk command as superuser
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ExecStart = "+${lib.getExe pkgs.btrbk} -c /etc/btrbk/home.conf run";
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Environment = "DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus"; # ensure the notification is sent to the correct display
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ExecStartPost = "${lib.getExe pkgs.libnotify} \"Backup\" \"Snapshot of /home created successfully.\"";
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};
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};
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systemd.timers.btrbk-home-snapshot = {
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enable = true;
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description = "Daily timer for btrbk home snapshot";
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = "*-*-* 12:00";
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Persistent = true; # ensures missed runs are triggered after resume
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};
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};
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# ensure the target directory exists
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systemd.tmpfiles.settings = {
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"btrbk snapshots" = {
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"${snapshotsDir}" = {
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d = {
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group = "root";
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user = "root";
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mode = "0770";
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};
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};
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};
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};
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# btrbk config for home snapshots
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environment.etc."btrbk/home.conf".text = ''
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timestamp_format long
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# keep snapshots for 2 days independently of the call
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snapshot_preserve_min 2d
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# retain daily snapshots for 14 days
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snapshot_preserve 14d
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subvolume /home
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snapshot_dir ${snapshotsDir}
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'';
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# Now create a restic backup off the newest btrbk snapshot
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systemd.services.restic-backup-latest-snapshot = {
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description = "Backup home subvolume using restic";
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serviceConfig = {
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Type = "oneshot";
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ExecStart = "${lib.getExe pkgs.restic} -r /home/snapshots/restic-backup backup /home/snapshots/home-$(date +%Y-%m-%d_%H-%M-%S)";
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# send a notification when the service is done
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ExecStartPost = "su remy -c 'notify-send \"Restic Backup\" \"Home backup created successfully.\"'";
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};
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};
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# # the udev rule:
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# services.udev.extraRules = ''
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# ACTION=="add", SUBSYSTEM=="block", ENV{ID_FS_LABEL}=="backup-restic", TAG+="systemd", ENV{SYSTEMD_WANTS}="backup-restic.service"
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# '';
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# # the systemd service:
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# systemd.services.backup-restic = {
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# description = "Backup using restic (triggered when USB drive is plugged in)";
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# after = [ "local-fs.target" ];
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# wantedBy = [ "multi-user.target" ];
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# serviceConfig = {
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# Type = "oneshot";
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# # TODO: adapt command
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# ExecStart = "${lib.getExe pkgs.restic} backup /home/username";
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# };
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# };
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}
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