From ec3734c5ef9fcfe97c21cd19f198ec779ab5f052 Mon Sep 17 00:00:00 2001
From: sommerfeld <sommerfeld@sommerfeld.dev>
Date: Fri, 29 May 2026 11:18:15 +0100
Subject: refactor(suspend): gate suspend on AC, drop bespoke zellij inhibit

New, simpler suspend policy:

  AC plugged in   -> never auto-suspends (lid close ignored, idle no-op)
  On battery only -> lid close suspends, swayidle suspends at 30 min idle

This replaces the SSH/zellij-aware inhibit machinery with a rule that
matches the user's mental model: if you don't want the machine to
sleep, plug it in. Long-running tasks (builds, downloads, SSH
sessions, headless services) just need AC.

Changes:

* etc/systemd/logind.conf.d/20-lid-ac.conf: set
  HandleLidSwitchExternalPower=ignore so logind itself handles the AC
  case at the source. No userspace daemon, no race, no rate-limit risk.
* dot_local/bin/on-battery-suspend: tiny POSIX wrapper that exits 0
  when any /sys/class/power_supply/{AC,ADP}*/online == 1, else execs
  `systemctl suspend`.
* dot_config/systemd/user/swayidle.service: add
  `timeout 1800 on-battery-suspend`. Idle suspend now exists, but only
  when on battery.
* Delete zellij-inhibit-suspend.{path,service} + watcher script and
  remove the entry from systemd-units/user.txt. The .path
  re-trigger storm bug is moot because the whole mechanism is gone.

Manual suspends (sway XF86Sleep keybind, sway power submode `s`,
`systemctl suspend` over SSH) still always work regardless of AC --
explicit user intent wins.

Also drop /migrate-podman-to-btrfs.sh from .gitignore; the one-off
migration script has been deleted now that the user has switched their
podman storage to the btrfs driver.

On-host steps to apply:

  chezmoi apply -v
  systemctl --user daemon-reload
  systemctl --user reset-failed zellij-inhibit-suspend.service zellij-inhibit-suspend.path || true
  systemctl --user stop zellij-inhibit-suspend.path zellij-inhibit-suspend.service || true
  systemctl --user disable zellij-inhibit-suspend.path || true
  systemctl --user restart swayidle.service
  # logind drop-in is reloaded automatically by the etc deploy script.

Verify:

  systemctl status systemd-logind | grep -i lid
  loginctl show-session $XDG_SESSION_ID | grep -i lid
  # Unplug AC -> close lid -> should suspend.
  # Plug AC   -> close lid -> nothing happens.
---
 dot_local/bin/executable_on-battery-suspend | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 dot_local/bin/executable_on-battery-suspend

(limited to 'dot_local/bin/executable_on-battery-suspend')

diff --git a/dot_local/bin/executable_on-battery-suspend b/dot_local/bin/executable_on-battery-suspend
new file mode 100644
index 0000000..2f39cc7
--- /dev/null
+++ b/dot_local/bin/executable_on-battery-suspend
@@ -0,0 +1,18 @@
+#!/bin/sh
+# Suspend the system, but only if running on battery. Used as the
+# swayidle `timeout` action so idle suspends save battery without ever
+# firing while the laptop is plugged in.
+#
+# Manual suspends (sway keybinds, `systemctl suspend` over SSH) bypass
+# this script and always work -- explicit user intent wins.
+set -eu
+
+for ac in /sys/class/power_supply/AC*/online \
+  /sys/class/power_supply/ADP*/online; do
+  [ -r "$ac" ] || continue
+  if [ "$(cat "$ac")" = "1" ]; then
+    exit 0
+  fi
+done
+
+exec systemctl suspend
-- 
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