Cursor background agent setup

Dockerfile

# Use official Ruby 3.3.4 image as base
FROM ruby:3.3.4-bullseye

# Set environment variables
ENV RAILS_ENV=development
ENV RACK_ENV=development
ENV NODE_VERSION=16.14.2
ENV YARN_VERSION=1.22.19

# Set timezone to Europe/London
ENV TZ=Europe/London
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

# Install system dependencies and development tools
RUN apt-get update -qq && \
    apt-get install -yqq \
    build-essential \
    libpq-dev \
    libcurl4-openssl-dev \
    curl \
    gnupg2 \
    lsb-release \
    wget \
    git \
    vim \
    postgresql \
    postgresql-contrib \
    redis-server \
    sudo \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Set up PostgreSQL APT repository and install pgvector
RUN curl -fsSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - && \
    echo "deb https://apt.postgresql.org/pub/repos/apt bullseye-pgdg main" > /etc/apt/sources.list.d/pgdg.list && \
    apt-get update -qq && \
    apt-get install -yqq postgresql-13-pgvector && \
    rm -rf /var/lib/apt/lists/*

# Install Node.js 16.14.2
RUN curl -fsSL https://deb.nodesource.com/setup_16.x | bash - && \
    apt-get install -y nodejs

# Install Yarn
RUN npm install -g yarn@$YARN_VERSION

# Install Bundler
RUN gem install bundler

# Create a non-root user
RUN useradd -m -s /bin/bash ubuntu && \
    echo 'ubuntu ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers

# Fix gem installation permissions for ubuntu user
RUN chown -R ubuntu:ubuntu /usr/local/bundle && \
    mkdir -p /home/ubuntu/.gem && \
    chown -R ubuntu:ubuntu /home/ubuntu/.gem

# Set up PostgreSQL for the user
RUN service postgresql start && \
    sudo -u postgres createuser --superuser ubuntu && \
    sudo -u postgres createdb rapid_ruby_development && \
    sudo -u postgres createdb rapid_ruby_test && \
    # TODO: Uncomment this once we need pgvector
    # sudo -u postgres psql -d rapid_ruby_development -c "CREATE EXTENSION IF NOT EXISTS vector;" && \
    # sudo -u postgres psql -d rapid_ruby_test -c "CREATE EXTENSION IF NOT EXISTS vector;" && \
    service postgresql stop

# Switch to the ubuntu user and set working directory to home
USER ubuntu
WORKDIR /home/ubuntu

# Create a startup script that starts services
RUN echo '#!/bin/bash' > /home/ubuntu/start-services.sh && \
    echo 'sudo service postgresql start' >> /home/ubuntu/start-services.sh && \
    echo 'sudo service redis-server start' >> /home/ubuntu/start-services.sh && \
    echo 'exec "$@"' >> /home/ubuntu/start-services.sh && \
    chmod +x /home/ubuntu/start-services.sh

# Default command to start services and keep container running
CMD ["/home/ubuntu/start-services.sh", "tail", "-f", "/dev/null"]

environment.json

{
  "build": {
    "context": ".",
    "dockerfile": "Dockerfile"
  },
  "install": ".cursor/setup.sh",
  "terminals": [
    {
      "name": "rails-server",
      "command": "bin/rails server -b 0.0.0.0 -p 3000",
      "description": "Runs the Rails development server on port 3000"
    },
    {
      "name": "tailwind-watch",
      "command": "bundle exec tailwindcss:watch",
      "description": "Watches and compiles Tailwind CSS changes"
    },
    {
      "name": "solid_queue",
      "command": "bundle exec solid_queue:start",
      "description": "Runs the SolidQueue background job processor"
    },
    {
      "name": "rails-console",
      "command": "bundle exec rails console",
      "description": "Runs the Rails console"
    },
    {
      "name": "rspec",
      "command": "bundle exec rspec",
      "description": "Runs the RSpec tests"
    }
  ]
}

setup.sh

# .cursor/setup.sh

# Set the Rails master key
export RAILS_MASTER_KEY=$RAPID_RUBY_MASTER_KEY
echo $RAPID_RUBY_MASTER_KEY > config/master.key

# Install dependencies
gem install bundler
bundle install

# Precompile assets
bundle exec rails assets:precompile || true

# Startup services
/home/ubuntu/start-services.sh

# Migrate database
bundle exec rails db:migrate
bundle exec rails db:migrate RAILS_ENV=test

# Assume unchange files in git for certain folders
git update-index --assume-unchanged .vscode/settings.json || true
git update-index --assume-unchanged .vscode/tasks.json || true