update bash script

Author: James N.

voice_agent/app/start.sh

@@ -1,56 +1,91 @@
-#!/bin/sh  
-# This script sets up and starts both the backend and the frontend for local development.  
-# The backend is run with a Python virtual environment and the frontend uses Vite’s dev server.  
+#!/usr/bin/env bash  
+#  
+# dev.sh  –  start backend (FastAPI) and frontend (Vite) in watch mode  
+#            while taking care of Python venv / npm install, plus  
+#            graceful shutdown on Ctrl-C.  
+  
+set -euo pipefail  
+  
+###############################################################################  
+# Helper functions  
+###############################################################################  
+die () { echo "ERROR: $*" >&2; exit 1; }  
 
-# --------------------------- Start the Backend Service ---------------------------  
-echo ""  
+cleanup () {  
+  echo                    # blank line  
+  echo "Stopping services…"  
+  [[ -n "${backend_pid:-}"  ]] && kill "$backend_pid"  2>/dev/null || true  
+  [[ -n "${frontend_pid:-}" ]] && kill "$frontend_pid" 2>/dev/null || true  
+  exit 0  
+}  
+  
+trap cleanup INT TERM  
+  
+###############################################################################  
+# Backend  
+###############################################################################  
+echo  
 echo "Setting up the Python virtual environment for the backend..."  
 
-cd backend || { echo "backend folder not found."; exit 1; }  
+[[ -d backend ]] || die "backend folder not found."  
+pushd backend > /dev/null  
 
-# Create virtual environment if it doesn't exist  
-if [ ! -d ".venv" ]; then  
-    python3 -m venv .venv  
+# ------------------------------------------------------------------  
+# Create / upgrade the virtual-env  
+# ------------------------------------------------------------------  
+if [[ ! -d .venv ]]; then  
+  # --upgrade-deps guarantees fresh pip / setuptools / wheel  
+  python -m venv --upgrade-deps .venv  
+else  
+  # env exists – still make sure the essentials are up to date  
+  .venv/bin/python -m pip install --upgrade pip setuptools wheel packaging  
 fi  
 
-echo ""  
-echo "Installing backend Python packages..."  
-./.venv/bin/python -m pip install -r requirements.txt || { echo "Backend dependency installation failed."; exit 1; }  
+echo  
+echo "Installing backend Python packages…"  
 
-echo ""  
-echo "Starting backend service (listening on port 8765)..."  
-# Use --reload for auto-restarting during development  
-./.venv/bin/python app.py --reload &  
-BACKEND_PID=$!  
+venv_py=".venv/bin/python"  
+[[ -x "$venv_py" ]] || { popd >/dev/null; die "Could not find the virtual-env Python executable."; }  
 
-cd ..  
+"$venv_py" -m pip install -r requirements.txt || { popd >/dev/null; die "Backend dependency installation failed."; }  
 
-# --------------------------- Start the Frontend Service ---------------------------  
-echo ""  
-echo "Installing frontend npm packages..."  
+echo  
+echo "Starting backend service (listening on port 8765)…"  
 
-cd frontend || { echo "frontend folder not found."; exit 1; }  
-npm install || { echo "Frontend npm installation failed."; exit 1; }  
+# Launch FastAPI (or whatever app.py holds) in the background  
+"$venv_py" app.py --reload &  
+backend_pid=$!  
 
-# Note:  
-# • The .env file for the frontend should be placed in the frontend directory (i.e., ./frontend/.env)  
-# • This file can contain environment variables such as BACKEND_WS_URL that Vite will load.  
-#  
-# Example .env file:  
-VITE_BACKEND_WS_URL="ws://localhost:8765"  
+popd > /dev/null  
 
-echo ""  
-echo "Starting frontend dev server..."  
-npm run dev &  
-FRONTEND_PID=$!  
+###############################################################################  
+# Frontend  
+###############################################################################  
+echo  
+echo "Installing frontend npm packages…"  
+  
+[[ -d frontend ]] || { kill "$backend_pid"; die "frontend folder not found."; }  
+pushd frontend > /dev/null  
+  
+npm install || { popd >/dev/null; kill "$backend_pid"; die "Frontend npm installation failed."; }  
 
-cd ..  
+echo  
+echo "Starting frontend dev server…"  
+  
+export VITE_BACKEND_WS_URL="ws://localhost:8765"  
+npm run dev &  
+frontend_pid=$!  
 
-# --------------------------- Clean-up on Exit ---------------------------  
-trap "echo 'Stopping services...'; kill $BACKEND_PID; kill $FRONTEND_PID; exit 0" INT TERM  
+popd > /dev/null  
 
-echo ""  
+###############################################################################  
+# Wait forever until user presses Ctrl-C  
+###############################################################################  
+echo  
 echo "Both backend and frontend services are running."  
 echo "Press Ctrl+C to stop."  
 
-wait  
+# Keep script alive  
+while true; do  
+  sleep 1  
+done