7200fee4

By: Ammar <ammar.nanjiani@gmail.com>

feat(steammachine): enable Wake-on-LAN on enp5s0

The machine sleeps on a power-button event via steamos-powerbuttond
(Deck semantics: Jovian wires it as a user unit and sets logind
HandlePowerKey = "ignore"). While in s2idle it answers no ARP and drops
off Tailscale, so it becomes unadministrable until something local wakes
it. Observed directly: unreachable for 3h41m, and a nix-copy-closure
deploy failed with "Connection closed by 192.168.1.111".

The NIC supports it, so no need to give up console sleep:

  Supports Wake-on: pumbg
  Wake-on: d
  driver: r8169, rtl8168h-2_0.0.2, link 1000Mb/s

networking.interfaces.<name>.wakeOnLan defaults its policy to [ "magic" ],
which is exactly the magic packet wakeonlan sends. Also installs ethtool,
which the base profile lacks, to verify Wake-on: g after a reboot. It
writes a systemd .link, so it applies when the device appears, not live.

Caveat: r8169 is the same Realtek driver family as the rivendell
postmortem. That was offload and RX bugs rather than WoL, but a real wake
still needs testing before trusting it.

Total

24m09s

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