Dockerfile

# Use Miniconda3 (Debian-based) to get Cling easily
FROM continuumio/miniconda3

# Install System Dependencies
RUN apt-get update && apt-get install -y \
    wget \
    curl \
    git \
    && rm -rf /var/lib/apt/lists/*

# Install Go (latest stable)
ENV GO_VERSION=1.21.6
RUN ARCH=$(dpkg --print-architecture) && \
    wget https://go.dev/dl/go${GO_VERSION}.linux-${ARCH}.tar.gz && \
    tar -C /usr/local -xzf go${GO_VERSION}.linux-${ARCH}.tar.gz && \
    rm go${GO_VERSION}.linux-${ARCH}.tar.gz
ENV PATH=$PATH:/usr/local/go/bin

# Install Cling via Conda
# We create a specific environment or install in base. Installing in base is easier for single-purpose container.
RUN conda install -y -c conda-forge cling && \
    conda clean -afy

# Set Workdir
WORKDIR /app

# Set LD_LIBRARY_PATH so Cling finds its libs at runtime
ENV LD_LIBRARY_PATH=/opt/conda/lib

# Copy Kernel Wrapper
COPY kernel ./kernel

# Copy Backend Source & Build
COPY backend ./backend
# Build the server binary
RUN cd backend && go build -o server ./cmd/server/main.go

# Runtime Configuration
ENV PORT=8080
ENV KERNEL_PATH="python3 /app/kernel/kernel_wrapper.py"
ENV CLING_PATH=/opt/conda/bin/cling

# Expose port
EXPOSE 8080

# Start the backend
CMD ["./backend/server"]