chore: import upstream snapshot with attribution

showcase/integrations/ms-agent-python/entrypoint.sh

@@ -0,0 +1,108 @@
+#!/bin/bash
+set -e
+
+cleanup() {
+  kill $AGENT_PID $NEXTJS_PID $WATCHDOG_PID 2>/dev/null || true
+}
+trap cleanup EXIT
+
+# Disable Python stdout buffering so the FastAPI/uvicorn agent flushes
+# tracebacks and log lines immediately. Without this a silent crash during
+# module import can sit in Python's userspace buffer until the process
+# exits, by which point the container is already gone.
+export PYTHONUNBUFFERED=1
+
+echo "========================================="
+echo "[entrypoint] Starting showcase package: ms-agent-python"
+echo "[entrypoint] Time: $(date -u)"
+echo "[entrypoint] PORT=${PORT:-not set}"
+echo "[entrypoint] NODE_ENV=${NODE_ENV:-not set}"
+echo "========================================="
+
+if [ -z "$OPENAI_API_KEY" ]; then
+  echo "[entrypoint] WARNING: OPENAI_API_KEY is not set! Agent will fail."
+else
+  echo "[entrypoint] OPENAI_API_KEY: set (${#OPENAI_API_KEY} chars)"
+fi
+
+# Start agent backend on :8000 with log prefixing so its output is
+# distinguishable from Next.js in the Railway log stream.
+#
+# Belt-and-suspenders log flushing: `PYTHONUNBUFFERED=1` above exports the env
+# var, but a child process could in principle un-export or override it. The
+# `-u` flag to the Python interpreter forces unbuffered stdout/stderr at the
+# interpreter level and is not overridable by user code. Combined with the
+# `fflush()` inside the awk pipe below, this guarantees uvicorn request lines
+# and tracebacks reach Railway's log stream line-at-a-time rather than
+# block-buffered in pipe buffers.
+echo "[entrypoint] Starting Python agent on port 8000..."
+python -u -m uvicorn agent_server:app --host 0.0.0.0 --port 8000 &> >(awk '{print "[agent] " $0; fflush()}') &
+AGENT_PID=$!
+sleep 2
+if kill -0 $AGENT_PID 2>/dev/null; then
+  echo "[entrypoint] Agent started (PID: $AGENT_PID)"
+else
+  echo "[entrypoint] ERROR: Agent failed to start — exiting"
+  exit 1
+fi
+
+echo "========================================="
+echo "[entrypoint] Starting Next.js frontend on port ${PORT:-10000}..."
+echo "========================================="
+
+PORT=${PORT:-10000}
+# Scope NODE_ENV=production to the Next.js invocation ONLY, not the whole
+# container environment. `ENV NODE_ENV=production` at the image level would
+# leak into every child process (Python agent, shell, healthchecks). `env`
+# prefix binds the value to this single exec.
+env NODE_ENV=production npx next start --port $PORT &> >(awk '{print "[nextjs] " $0; fflush()}') &
+NEXTJS_PID=$!
+
+echo "[entrypoint] Next.js started (PID: $NEXTJS_PID)"
+
+# Watchdog: Railway deploys of showcase packages have been observed to hit a
+# silent agent hang — the Python process stays alive (so `wait -n` never
+# fires and the container never restarts) but stops responding on :8000.
+# Poll the agent's /health endpoint every 30s; after 3 consecutive failures
+# (90s of unreachable agent), kill the agent process so `wait -n` returns
+# and Railway restarts the container. We kill the agent (not the whole
+# script) first so `set -e` + `wait -n; exit $?` handles the restart
+# through the normal path rather than a forced `exit` that would bypass
+# logging. Generalized from showcase/integrations/crewai-crews/entrypoint.sh
+# (PRs #4114 + #4115).
+(
+  FAILS=0
+  while sleep 30; do
+    if ! kill -0 $AGENT_PID 2>/dev/null; then
+      # Agent already dead — wait -n in the main shell will handle it.
+      break
+    fi
+    if curl -fsS --max-time 5 http://127.0.0.1:8000/health > /dev/null 2>&1; then
+      FAILS=0
+    else
+      FAILS=$((FAILS + 1))
+      echo "[watchdog] Agent health probe failed (count=$FAILS)"
+      if [ $FAILS -ge 3 ]; then
+        echo "[watchdog] Agent unresponsive for ~90s — killing PID $AGENT_PID to trigger container restart"
+        kill -9 $AGENT_PID 2>/dev/null || true
+        break
+      fi
+    fi
+  done
+) &
+WATCHDOG_PID=$!
+
+echo "[entrypoint] Watchdog started (PID: $WATCHDOG_PID)"
+echo "[entrypoint] All processes running. Waiting..."
+
+wait -n $AGENT_PID $NEXTJS_PID
+EXIT_CODE=$?
+if ! kill -0 $AGENT_PID 2>/dev/null; then
+  echo "[entrypoint] Agent (PID: $AGENT_PID) exited with code $EXIT_CODE"
+elif ! kill -0 $NEXTJS_PID 2>/dev/null; then
+  echo "[entrypoint] Next.js (PID: $NEXTJS_PID) exited with code $EXIT_CODE"
+else
+  echo "[entrypoint] A process exited with code $EXIT_CODE"
+fi
+
+exit $EXIT_CODE