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test(power): VM check for battery charge-limit udev re-apply

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Add checks.battery-charge-limit (runNixOSTest): the test_power module
fakes a Mains adapter, toggling ac_online emits a real power_supply
uevent, and the test asserts the udev rule restarts the oneshot (changed
InvocationID). Verifies the re-apply *trigger* at runtime, beyond the
earlier eval check; the sysfs write still needs real hardware. Also
records the SSH_AUTH_SOCK rendered-artifact verification in the roadmap.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Bernardo Magri
2026-06-30 21:41:24 +01:00
parent cdd1897b14
commit 7d6d74fd7f
2 changed files with 60 additions and 7 deletions
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47
flake.nix
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@@ -159,6 +159,53 @@
machine.succeed("grep -q pam_fprintd /etc/pam.d/sudo")
'';
};
# Runtime VM check for the battery-charge-limit re-apply: the udev
# rule must restart the oneshot on an AC state change (firmware can
# clear the threshold on unplug). The `test_power` module fakes a
# Mains adapter we can toggle to emit a real power_supply uevent —
# so this exercises the trigger, not just the config wiring. (The
# sysfs *write* needs a real charge_control_end_threshold and stays
# an on-hardware check.) Imports options.nix (where the power
# options live) + power.nix, so the VM stays minimal.
battery-charge-limit = pkgs.testers.runNixOSTest {
name = "nomarchy-battery-charge-limit";
nodes.machine = { ... }: {
imports = [ ./modules/nixos/options.nix ./modules/nixos/power.nix ];
boot.kernelModules = [ "test_power" ]; # fake Mains + battery
nomarchy.system.power = {
enable = true;
laptop = true;
batteryChargeLimit = 80;
};
};
testScript = ''
machine.wait_for_unit("multi-user.target")
# The oneshot exists and the fake Mains adapter is present.
machine.succeed("systemctl cat nomarchy-battery-charge-limit.service")
machine.succeed("udevadm settle")
machine.succeed("grep -lx Mains /sys/class/power_supply/*/type")
# Let any add-event restart settle, then sample the invocation.
machine.succeed("sleep 2")
before = machine.succeed(
"systemctl show -p InvocationID --value "
"nomarchy-battery-charge-limit.service"
).strip()
# Simulate an AC unplug → 'change' uevent on the Mains device.
machine.succeed("echo off > /sys/module/test_power/parameters/ac_online")
machine.succeed("udevadm settle")
# The udev rule must have restarted the oneshot (new InvocationID).
machine.wait_until_succeeds(
'test "$(systemctl show -p InvocationID --value '
'nomarchy-battery-charge-limit.service)" != "' + before + '"',
timeout=30,
)
'';
};
};
# ─── Reference host ────────────────────────────────────────────