entrypoint.sh

#!/bin/bash

# Function to handle errors
handle_error() {
    echo "Error: $1"
    exit 1
}

# Verify and create the /data directory if it doesn't exist
if [ ! -d "/data" ]; then
    mkdir -p /data || handle_error "Could not create /data directory"
    echo "/data directory created for persistent storage"
fi

# Verify write permissions for /data directory
if [ ! -w "/data" ]; then
    echo "Warning: No write permissions for /data. Some data may not be persistent."
fi

# Read JupyterLab token from the mounted secret file
if [ -f "/run/secrets/JUPYTER_TOKEN" ]; then
    export JUPYTER_TOKEN=$(cat /run/secrets/JUPYTER_TOKEN)
else
    echo "JUPYTER_TOKEN secret not found. Using AUX_TOKEN as fallback."
    export JUPYTER_TOKEN=${AUX_TOKEN:-}
fi

# Verify if the token is empty
if [ -z "$JUPYTER_TOKEN" ]; then
    handle_error "JupyterLab token is empty"
fi

# Check for GPU availability
if command -v nvidia-smi &> /dev/null; then
    echo "GPU detected. Configuring environment for GPU usage."
    export NVIDIA_VISIBLE_DEVICES=all
    export NVIDIA_DRIVER_CAPABILITIES=compute,utility
else
    echo "No GPU detected. CPU will be used."
fi

# Start JupyterLab in the background
jupyter lab --ip=0.0.0.0 --port=${JUPYTERLAB_PORT} --no-browser --allow-root \
    --NotebookApp.token=${JUPYTER_TOKEN} \
    --notebook-dir=/data &

# Ensure the Nginx PID file is writable
touch /tmp/nginx.pid
chmod 644 /tmp/nginx.pid

# Start Nginx in the foreground
nginx -g "daemon off;" -c /etc/nginx/nginx.conf || handle_error "Failed to start Nginx"