Caught live-testing the previous commit: every sleeper run exited 141
(SIGPIPE) in ~1s with no output, never reaching the scale-down. Cause:
`set -o pipefail` + `dumpsys power | awk '...; exit'` — awk closes the pipe
after the first match while `kubectl exec` is still streaming dumpsys, so
the exec gets SIGPIPE, pipefail makes the pipeline 141, and set -e kills the
script before any echo. (My earlier dry-run missed it because it didn't run
under `set -euo pipefail`.)
Fix: drop pipefail; capture each exec to a var (`|| true`) then parse with
awk reading to END (no early `exit`), so nothing can SIGPIPE mid-stream and
a failed/booting exec falls through to the fail-safe "do not sleep" branch.
Also fetch the pod name via jsonpath instead of `-o name | head -1` (no pipe
to SIGPIPE, no `pod/` prefix to strip), and exec `adb` directly without the
`sh -c` wrapper.
Verified live: ran the corrected script as the gate ServiceAccount against
the stuck emulator (idle ~120h) — it logged "idle >= 6h ... scaling to zero"
and patched the deployment to replicas=0. The 6+ day pod is now asleep.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The emulator was meant to scale to zero when idle but had been up 6+ days
straight despite ~5 days with no real use. Two bugs:
1. The idle check counted ESTABLISHED TCP connections to the adb/noVNC
ports. A forgotten `adb connect` (no disconnect) holds that transport
open forever, so every 15-min run saw "active" and reset the counter --
it never reached the sleep branch. (Right now: 4 such stale transports
from pods on k8s-node3/node4.)
2. Even when it did reach the sleep branch, `kubectl scale --replicas=0`
failed Forbidden -- the gate ServiceAccount can patch `deployments` but
not `deployments/scale`.
Switch the sleeper to measure actual use: time since last user activity
(taps/keys/app-launches, incl. noVNC clicks) from `dumpsys power` vs guest
uptime. No interaction for 6h -> sleep. This ignores idle/forgotten
connections entirely. Scale down with a direct replicas patch on the named
deployment (same path the wake gate scales up), so it needs only the
existing `deployments` patch grant -- no `deployments/scale`. Now stateless
(drops the idle-counter annotation; gate.py no longer sets it) and lighter
on etcd. Fail-safe: any read error (e.g. mid-boot) does not sleep.
Requested by Viktor: turn the dev-only emulator off when it hasn't been
used for 6h.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Viktor's direction (2026-06-12): the emulator is dev-only, so it should
be on-demand, and it should use the T4 where applicable. (1) api36-v5
runs '-gpu host' on the GPU node (nodeSelector + time-slice + EGL libs;
automatic swiftshader fallback if GPU init dies) — screen-on rendering
moves off the CPU (~5 cores → expected 1-2). (2) The wake gate (stdlib
python, owns / on both hostnames) scales the deployment 0→1 on visit and
hands the browser to noVNC when ready; agents GET /wake + /status. The
idle-sleeper CronJob counts established adb/noVNC connections via
/proc/net/tcp (excluding the in-container loopback adb client) and scales
to zero after 4 idle checks (~1h). TF ignores replicas drift. VRAM cost
(~0.5-1GiB) is held only while awake, protecting llama-swap headroom.
