settings.json

{
  "hooks": {
    "SessionStart": [
      {
        "matcher": "startup",
        "hooks": [
          {
            "type": "command",
            "command": "\"$CLAUDE_PROJECT_DIR\"/scripts/setup_env2.sh"
          }
        ]
      }
    ]
  }
}

setup_env2.sh

#!/bin/bash

set -e

if [ "$CLAUDE_CODE_REMOTE" != "true" ]; then
  exit 0
fi

echo "==> Setting up Elixir environment"
echo ""

# Check if Elixir is already installed
if command -v elixir &> /dev/null; then
    echo "✓ Elixir already installed ($(elixir --version 2>&1 | grep 'Elixir' | awk '{print $2}'))"
else
    echo "Installing Elixir 1.19.2 with OTP 28.1..."
    curl -fsSO https://elixir-lang.org/install.sh
    sh install.sh [email protected] [email protected] > /dev/null 2>&1
    rm install.sh
    echo "✓ Elixir installed"
fi

# Set up environment variables
export PATH=$HOME/.elixir-install/installs/otp/28.1/bin:$PATH
export PATH=$HOME/.elixir-install/installs/elixir/1.19.2-otp-28/bin:$PATH

# Set locale to UTF-8
export LC_ALL=C.UTF-8
export LANG=C.UTF-8
export LANGUAGE=C.UTF-8

if [ -n "$CLAUDE_ENV_FILE" ]; then
  echo 'export PATH=$HOME/.elixir-install/installs/otp/28.1/bin:$PATH' >> "$CLAUDE_ENV_FILE"
  echo 'export PATH=$HOME/.elixir-install/installs/elixir/1.19.2-otp-28/bin:$PATH' >> "$CLAUDE_ENV_FILE"
  echo 'export LC_ALL=C.UTF-8' >> "$CLAUDE_ENV_FILE"
  echo 'export LANG=C.UTF-8' >> "$CLAUDE_ENV_FILE"
  echo 'export LANGUAGE=C.UTF-8' >> "$CLAUDE_ENV_FILE"
  echo "✓ Added to $CLAUDE_ENV_FILE"
fi

# Install Hex package manager
if mix hex.info &> /dev/null; then
    echo "✓ Hex already installed"
else
    echo "Installing Hex package manager..."
    mix local.hex --force > /dev/null 2>&1
    echo "✓ Hex installed"
fi

# Install Rebar (Erlang build tool)
if mix local.rebar --force &> /dev/null; then
    echo "✓ Rebar installed"
fi

# Configure Hex to use system CA certificates
if [ -f /etc/ssl/certs/ca-certificates.crt ]; then
    mix hex.config cacerts_path /etc/ssl/certs/ca-certificates.crt > /dev/null 2>&1
    echo "✓ Hex SSL certificates configured"
fi

# Install project dependencies
echo ""
echo "==> Installing project dependencies"
if [ -f mix.exs ]; then
    mix deps.get
    echo "✓ Dependencies installed"
    echo "Compiling project..."
    mix compile
    echo "✓ Project compiled"
else
    echo "⚠ No mix.exs found in current directory"
fi

# Set up PostgreSQL
echo ""
echo "==> Setting up PostgreSQL"

# Check if PostgreSQL is already running
if pg_isready &> /dev/null; then
    echo "✓ PostgreSQL already running"
else
    # Ensure PostgreSQL is installed
    if ! command -v psql &> /dev/null && [ ! -x /usr/lib/postgresql/16/bin/postgres ]; then
        echo "✗ PostgreSQL not installed. Please install PostgreSQL 16 or later."
        exit 1
    fi

    # Check if SSL needs to be disabled in config
    if [ -f /etc/postgresql/16/main/postgresql.conf ]; then
        if grep -q "^ssl = on" /etc/postgresql/16/main/postgresql.conf; then
            echo "Disabling SSL for development..."
            sed -i "s/^ssl = on/ssl = off/" /etc/postgresql/16/main/postgresql.conf
        fi
    fi

    # Fix pg_hba.conf for local development (trust auth)
    if [ -f /etc/postgresql/16/main/pg_hba.conf ]; then
        if grep -q "peer" /etc/postgresql/16/main/pg_hba.conf; then
            echo "Configuring PostgreSQL authentication..."
            # Backup original config
            cp /etc/postgresql/16/main/pg_hba.conf /etc/postgresql/16/main/pg_hba.conf.bak 2>/dev/null || true
            # Change peer to trust for local connections, scram-sha-256 to md5 for TCP
            sed -i 's/^\(local.*\)peer$/\1trust/' /etc/postgresql/16/main/pg_hba.conf
            sed -i 's/^\(host.*127\.0\.0\.1.*\)scram-sha-256$/\1md5/' /etc/postgresql/16/main/pg_hba.conf
        fi
        # Ensure correct permissions
        chown claude:ubuntu /etc/postgresql/16/main/pg_hba.conf 2>/dev/null || true
        chmod 640 /etc/postgresql/16/main/pg_hba.conf 2>/dev/null || true
    fi

    # Start PostgreSQL as claude user
    echo "Starting PostgreSQL..."
    if su - claude -c "/usr/lib/postgresql/16/bin/pg_ctl -D /var/lib/postgresql/16/main -o '-c config_file=/etc/postgresql/16/main/postgresql.conf' -l /tmp/postgresql.log start" &> /dev/null; then
        # Wait for PostgreSQL to be ready
        for i in {1..10}; do
            if pg_isready &> /dev/null; then
                echo "✓ PostgreSQL started"
                break
            fi
            sleep 1
        done
    else
        echo "✗ Failed to start PostgreSQL. Check /tmp/postgresql.log for details."
        exit 1
    fi
fi

# Ensure postgres user exists with correct password
if pg_isready &> /dev/null; then
    su - claude -c "psql -U postgres -c \"SELECT 1\" &> /dev/null" || \
        su - claude -c "psql -U postgres -c \"ALTER USER postgres WITH PASSWORD 'password';\" &> /dev/null" || true
    echo "✓ PostgreSQL configured for development"
fi

echo ""
echo "==> Setup complete!"
echo "Elixir version: $(elixir --version 2>&1 | grep 'Elixir' | awk '{print $2}')"
echo "Erlang/OTP version: $(erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().' -noshell 2>&1)"
echo "PostgreSQL version: $(psql --version | awk '{print $3}')"