#!/usr/bin/env bash
# Chain the Qwen3-4B-Base arm behind the instruct arm.
#
# ⚠ Gated on the instruct run having actually produced an adapter. If that run died,
# this must not quietly start and consume the box: a chain that fires on failure turns
# one lost run into two.
set -uo pipefail
PREV=/home/infra-ops/r49-runs/yarros-4b-instruct-1ep
CHAINLOG=/home/infra-ops/r49-runs/chain-yarros-4b-base.log
exec >> "$CHAINLOG" 2>&1
echo "=== $(date -Is) chain armed, waiting on $PREV"
while [ -f "$PREV/run.pid" ] && kill -0 "$(cat "$PREV/run.pid")" 2>/dev/null; do sleep 60; done
echo "=== $(date -Is) instruct run finished"
if [ ! -f "$PREV/adapter/adapter_model.safetensors" ]; then
  echo "=== REFUSING to chain: $PREV produced no adapter -- the instruct run did not succeed"
  exit 1
fi
exec /home/infra-ops/r49-prep/launch-yarros-4b-base.sh