Dockerfile.dev

# syntax = docker/dockerfile:1
#
# DEVELOPMENT Dockerfile — do not use this in production.
#
# Unlike the production Dockerfile (which uses a multi-stage build to
# keep the final image small and free of build tools), this image keeps
# git, compilers and dev libraries installed permanently. You'll need
# them regularly to install/update gems, debug native extensions, etc.
#
# Make sure RUBY_VERSION matches the one in .ruby-version / Gemfile.
ARG RUBY_VERSION=3.4.10
FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim

WORKDIR /rails

# Plain development environment: no deployment mode, so Bundler is free
# to modify the Gemfile.lock (add platforms, update gems, etc.).
ENV RAILS_ENV="development" \
    BUNDLE_PATH="/usr/local/bundle"

# System packages needed to:
# - build-essential, pkg-config: compile gems with native extensions
# - git: required by Bundler for gems sourced from git repos
# - libpq-dev, postgresql-client: talk to Postgres (swap for your DB's
#   client libs if you're using MySQL/SQLite/etc.)
# - libyaml-dev: required to compile the psych gem (YAML parsing),
#   which Ruby/Rails depend on internally
# - libvips: image processing (used by ActiveStorage variants)
# - curl, vim, less: general-purpose tools useful when working inside
#   the container
RUN apt-get update -qq && \
    apt-get install --no-install-recommends -y \
        build-essential \
        git \
        libpq-dev \
        libyaml-dev \
        libvips \
        pkg-config \
        curl \
        postgresql-client \
        vim \
        less && \
    rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*

# Install the Bundler version pinned in Gemfile.lock, if present.
# This avoids "bundler version mismatch" errors when running bundle
# commands inside the container.
COPY Gemfile* ./
RUN if [ -f Gemfile.lock ]; then \
      bundle_version=$(tail -1 Gemfile.lock | tr -d '[:space:]'); \
      if [ -n "$bundle_version" ]; then gem install bundler -v "$bundle_version"; fi; \
    fi
RUN bundle install

COPY . .

EXPOSE 3000

# Drops you into a shell by default. docker-compose.dev.yml overrides
# this with `tty`/`stdin_open` so you can `exec` into a running
# container instead of relying on this CMD directly.
CMD ["bash"]