init

2026-05-07 22:37:08 +07:00 · 2026-05-07 22:37:08 +07:00 · 00cc68b7cc
commit 00cc68b7cc
parent 6b13eb3323
2 changed files with 104 additions and 0 deletions
--- a/modules/system/homelab/mc-backup.nix
+++ b/modules/system/homelab/mc-backup.nix
@ -0,0 +1,103 @@
+{ pkgs, ... }: let
+  serverName   = "mc0-explorers-creativity";
+  serviceName  = "minecraft-server-${serverName}";
+  backupDir    = "/mnt/data/backups/mc";
+  keepBackups  = 7;   # number of backups to retain
+  rconHost     = "localhost";
+  rconPort     = "25575";
+  rconPassword = "howdy";
+  ntfyUrl      = "http://127.0.0.1:8067";
+  ntfyTopic    = "mc-backup";
+
+  backupScript = pkgs.writeShellScriptBin "mc-backup" ''
+    set -euo pipefail
+
+    rcon() {
+      ${pkgs.rcon-cli}/bin/rcon-cli --address "${rconHost}:${rconPort}" --password "${rconPassword}" "$@" || true
+    }
+
+    BACKUP_OK=false
+
+    on_exit() {
+      # Always restart the server first
+      echo "[mc-backup] Restarting server..."
+      systemctl start ${serviceName}.service
+
+      # Notify via ntfy only on failure
+      if [ "$BACKUP_OK" != "true" ]; then
+        echo "[mc-backup] Sending failure notification..."
+        ${pkgs.curl}/bin/curl -s -o /dev/null \
+          -H "Title: Minecraft Backup Failed" \
+          -H "Priority: high" \
+          -H "Tags: warning" \
+          -d "Nightly backup failed at $(date '+%Y-%m-%d %H:%M:%S'). Check logs with: journalctl -u mc-backup -n 50" \
+          "${ntfyUrl}/${ntfyTopic}"
+      fi
+    }
+
+    # Always restart the server on exit, even if the script fails mid-backup
+    trap on_exit EXIT
+
+    # --- Countdown warnings via RCON ---
+    echo "[mc-backup] Sending 5-minute warning..."
+    rcon "say §c[Backup] §fServer will restart in §e5 minutes §ffor a scheduled backup."
+
+    sleep 240
+
+    echo "[mc-backup] Sending 1-minute warning..."
+    rcon "say §c[Backup] §fServer restarting in §e1 minute§f."
+
+    sleep 50
+
+    echo "[mc-backup] Sending 10-second warning..."
+    rcon "say §c[Backup] §fServer restarting in §e10 seconds§f."
+
+    sleep 10
+
+    rcon "say §c[Backup] §fShutting down now. Back shortly!"
+
+    # --- Save world & stop ---
+    echo "[mc-backup] Saving world..."
+    rcon "save-all"
+    sleep 5
+
+    echo "[mc-backup] Stopping ${serviceName}..."
+    systemctl stop ${serviceName}.service
+
+    # --- Backup ---
+    echo "[mc-backup] Backing up to ${backupDir}..."
+    mkdir -p "${backupDir}"
+    TIMESTAMP=$(date +%Y-%m-%d_%H-%M-%S)
+    XZ_OPT="-9e" tar -cJf "${backupDir}/mc-backup-$TIMESTAMP.tar.xz" \
+      -C /srv/minecraft ${serverName}
+
+    # Prune old backups, keeping the last ${toString keepBackups}
+    ls -t "${backupDir}"/mc-backup-*.tar.xz | tail -n +${toString (keepBackups + 1)} | xargs -r rm --
+
+    echo "[mc-backup] Backup complete: mc-backup-$TIMESTAMP.tar.xz"
+    BACKUP_OK=true
+    # Server restart is handled by the EXIT trap above
+  '';
+in {
+  environment.systemPackages = [ backupScript ];
+
+  systemd.services.mc-backup = {
+    description = "Nightly Minecraft server backup";
+    serviceConfig = {
+      Type           = "oneshot";
+      ExecStart      = "${backupScript}/bin/mc-backup";
+      User           = "root";
+      StandardOutput = "journal";
+      StandardError  = "journal";
+    };
+  };
+
+  systemd.timers.mc-backup = {
+    description = "Nightly Minecraft backup timer";
+    wantedBy    = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "daily";   # fires at 00:00:00 every day
+      Persistent = true;      # catch up if the machine was off at midnight
+    };
+  };
+}