feat: power management for nas

hosts/fw/configuration.nix

@@ -27,6 +27,7 @@
     ./modules/podman.nix
     ./modules/omada.nix
     ./modules/ddclient.nix
+    ./modules/nas-wake-on-access.nix
     # ./modules/wol.nix
 
 
@@ -94,7 +95,6 @@
   nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
     "mongodb"
     "ai-mailer"
-    "filebot"
     "claude-code"
   ];
 

hosts/fw/modules/firewall.nix

@@ -85,6 +85,12 @@
             chain forward {
               type filter hook forward priority filter; policy drop;
 
+              # Wake-on-access: flag new traffic aimed at the NAS so
+              # nas-wake-journal.service can fire a WOL. No verdict => falls
+              # through, does not broaden policy. ct state new skips ongoing
+              # flows; rate limit caps journal spam before it leaves the kernel.
+              ip daddr ${config.networkPrefix}.97.11 ct state new limit rate 30/minute log prefix "nas-wake: " comment "trigger wake-on-access"
+
               iifname "wg_cloonar" counter accept comment "test wireguard"
 
               iifname "wg_cloonar" oifname lo counter accept comment "wireguard to server"

hosts/fw/modules/nas-wake-on-access.nix

@@ -0,0 +1,110 @@
+# NAS wake-on-access (fw side)
+#
+# Detects traffic aimed at the NAS (10.42.97.11) and sends a WOL magic
+# packet so the machine comes back up on demand after it has powered itself
+# off (see hosts/nas/modules/auto-shutdown.nix).
+#
+# Traffic reaches the NAS via two paths, so we need two detectors that feed
+# the same wake script:
+#
+#   1. Cross-VLAN traffic is routed through fw and hits nftables' forward
+#      chain. A logging rule tags these packets and a journal follower
+#      translates the log line into a wake invocation.
+#
+#   2. Same-VLAN (server) traffic stays on the bridge and never reaches
+#      nftables. A tcpdump follower watches ARP-who-has for 10.42.97.11 on
+#      the server interface and triggers the wake from there.
+{ config, lib, pkgs, ... }:
+
+let
+  nasIp = "${config.networkPrefix}.97.11";
+  nasMac = "6c:1f:f7:8e:a9:86";
+  serverBroadcast = "${config.networkPrefix}.97.255";
+  serverIface = "server";
+
+  stateDir = "/run/nas-wake-on-access";
+  lastWakeFile = "${stateDir}/last-wake";
+  cooldownSeconds = 30;
+
+  wakeScript = pkgs.writeShellScript "nas-wake" ''
+    set -euo pipefail
+
+    mkdir -p "${stateDir}"
+    now=$(date +%s)
+
+    # Cooldown gate: at most one WOL every ${toString cooldownSeconds}s.
+    if [[ -f "${lastWakeFile}" ]]; then
+      last=$(cat "${lastWakeFile}" 2>/dev/null || echo 0)
+      if (( now - last < ${toString cooldownSeconds} )); then
+        exit 0
+      fi
+    fi
+
+    # If the NAS answers ping it is already up; skip WOL but refresh
+    # the cooldown so repeated probes don't spin the CPU.
+    if ${pkgs.iputils}/bin/ping -c1 -W1 -n ${nasIp} >/dev/null 2>&1; then
+      echo "nas-wake: NAS already up, not sending WOL"
+      echo "$now" > "${lastWakeFile}"
+      exit 0
+    fi
+
+    echo "nas-wake: sending WOL to ${nasMac} via ${serverBroadcast}"
+    ${pkgs.wol}/bin/wol -i ${serverBroadcast} ${nasMac} || true
+    echo "$now" > "${lastWakeFile}"
+  '';
+
+  # Journal follower for cross-VLAN (routed) traffic. nftables logs a line
+  # prefixed with "nas-wake: " into the kernel ring buffer for every new
+  # packet headed to the NAS (rate-limited kernel-side).
+  journalFollowerScript = pkgs.writeShellScript "nas-wake-journal-follower" ''
+    set -euo pipefail
+    ${pkgs.systemd}/bin/journalctl -kf -o cat --since now \
+      | ${pkgs.gnugrep}/bin/grep --line-buffered -F "nas-wake:" \
+      | while IFS= read -r _line; do
+          ${wakeScript} || true
+        done
+  '';
+
+  # ARP follower for same-VLAN traffic. Clients on the server VLAN talk to
+  # the NAS directly via the bridge, so their packets never hit nftables.
+  # An ARP "who-has 10.42.97.11" is the reliable early signal that someone
+  # wants to reach the NAS.
+  arpFollowerScript = pkgs.writeShellScript "nas-wake-arp-follower" ''
+    set -euo pipefail
+    ${pkgs.tcpdump}/bin/tcpdump -i ${serverIface} -l -n -p -Q in \
+        'arp and host ${nasIp}' \
+      | while IFS= read -r _line; do
+          ${wakeScript} || true
+        done
+  '';
+in
+{
+  systemd.services.nas-wake-journal = {
+    description = "Wake NAS on cross-VLAN traffic (nftables log follower)";
+    after = [ "nftables.service" "systemd-journald.service" ];
+    requires = [ "systemd-journald.service" ];
+    wantedBy = [ "multi-user.target" ];
+    path = with pkgs; [ coreutils iputils wol systemd gnugrep ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${journalFollowerScript}";
+      Restart = "always";
+      RestartSec = "5s";
+    };
+  };
+
+  systemd.services.nas-wake-arp = {
+    description = "Wake NAS on same-VLAN ARP (server bridge)";
+    after = [ "network-online.target" ];
+    wants = [ "network-online.target" ];
+    wantedBy = [ "multi-user.target" ];
+    path = with pkgs; [ coreutils iputils wol tcpdump ];
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "${arpFollowerScript}";
+      Restart = "always";
+      RestartSec = "5s";
+      AmbientCapabilities = [ "CAP_NET_RAW" "CAP_NET_ADMIN" ];
+    };
+  };
+}