nixos/home/services/backup-home.nix

{ pkgs, config, ... }:
let
  # Backup home script
  backup-home = pkgs.writeShellScriptBin "backup-home.sh"
    ''
      echo "========== BACKUP HOME STARTING =========="
      export RESTIC_PASSWORD="gunter.home.2rjus.net"
      export RESTIC_REPOSITORY="rest:http://10.69.12.52:8000/gunter.home.2rjus.net"
      GOTIFY_TOKEN=$(<"$XDG_RUNTIME_DIR/secrets/gotify_backup_home")

      echo "DEBUG: GOTIFY_TOKEN=$GOTIFY_TOKEN"
      echo "DEBUG: BUSADDR=$DBUS_SESSION_BUS_ADDRESS"

      if [ -z "$GOTIFY_TOKEN" ]; then
        ${pkgs.libnotify}/bin/notify-send -u critical "Backup issue" "No Gotify token found"
      fi

      # Send start notification
      ${pkgs.libnotify}/bin/notify-send -e -t 3000 "Backup started" "Backup of /home/torjus started"
      retval=$?
      if [ $retval -ne 0 ]; then
          echo "Failed to send notification"
      fi

      # Do the backup
      echo "========== BACKUP TASK STARTING =========="
      SECONDS=0
      ${pkgs.restic}/bin/restic backup /home/torjus \
          --exclude '/home/torjus/.cache' \
          --exclude '/home/torjus/.local/share/Steam' \
          --exclude '/home/torjus/.local/share/containers' \
          --exclude '/home/torjus/git/nixpkgs'
      retval=$?
      if [ $retval -ne 0 ]; then
          ${pkgs.libnotify}/bin/notify-send -u critical "Backup failed" "Backup of /home/torjus failed"
          retval=$?
          if [ $retval -ne 0 ]; then
            # TODO: put token in sops
            ${pkgs.curl}/bin/curl "https://gotify.t-juice.club/message?token=$GOTIFY_TOKEN" \
              -F "title=Backup of home@gunter failed!" \
              -F "message=Please check status of backup-home service"
          fi
      fi
      echo "========== BACKUP TASK COMPLETE =========="

      # Remove old snapshots and prune
      echo "========== PRUNE TASK STARTING =========="
      ${pkgs.restic}/bin/restic forget -d 7 -w 4 -m 6 --keep-within 1d --prune
      echo "========== PRUNE TASK COMPLETE =========="
      # Gather statistics
      echo "========== STATS TASK STARTING =========="
      stats=$(${pkgs.restic}/bin/restic stats --json)
      stats_raw=$(${pkgs.restic}/bin/restic stats --mode=raw-data --json)

      raw_size=$(${pkgs.jq}/bin/jq -r '.total_size' <<< $stats_raw \
          | ${pkgs.coreutils}/bin/numfmt --to=iec --suffix=B --format="%.2f")
      total_size=$(${pkgs.jq}/bin/jq -r '.total_size' <<< $stats \
          | ${pkgs.coreutils}/bin/numfmt --to=iec --suffix=B --format="%.2f")
      total_files=$(${pkgs.jq}/bin/jq -r '.total_file_count' <<< $stats \
          | ${pkgs.coreutils}/bin/numfmt --to=iec)
      total_snapshots=$(${pkgs.jq}/bin/jq -r '.snapshots_count' <<< $stats)
      message="$total_files files\n$total_snapshots snapshots\n$raw_size ($total_size)"
      echo "========== STATS TASK COMPLETE =========="

      # Send completion notification
      ${pkgs.libnotify}/bin/notify-send -i checkmark -e -t 10000 \
          "Backup of /home/torjus completed in ''${SECONDS}s" "$message"
      retval=$?
      if [ $retval -ne 0 ]; then
          echo "Failed to send notification"
          exit $retval
      fi
      echo "========== BACKUP HOME COMPLETE =========="
    '';
in
{
  sops.secrets."gotify_backup_home" = { };

  systemd.user.services.backup-home = {
    Unit = {
      Description = "Backup home directory";
      After = [ "network.target" "sops-nix.service" ];
    };
    Service = {
      Type = "oneshot";
      ExecStart = "${backup-home}/bin/backup-home.sh";
    };
  };
  systemd.user.timers.backup-home = {
    Unit = {
      Description = "Backup home directory";
      After = [ "network.target" ];
    };
    Timer = {
      OnCalendar = "*-*-* *:00:00";
      Persistent = true;
    };
    Install = {
      WantedBy = [ "timers.target" "graphical-session.target" ];
    };
  };
}