UbuntuTemplateHeadless.def

Bootstrap: docker
From: ubuntu:20.04

# Version and Documentation
# Version: X.X.X
# Documentation: This container is designed to run [Your Software] in a headless environment.

%files
    # Software Binary or Installer
    # /path/to/your/software/installer /opt/software/installer
    # Additional files like assets, plugins, or scripts can go here
    # /path/to/your/assets /opt/assets

%post
    # Install System Packages and Locale
    echo "Installing system packages and setting locale..."
    apt-get update
    apt-get install -y locales
    locale-gen en_US.UTF-8

    # Create Non-Root User
    echo "Creating non-root user..."
    useradd -ms /bin/bash user_name

    # Check and Install Software
    echo "Installing software..."
    # Your software installation steps here

    # Cleanup
    echo "Cleaning up..."
    apt-get clean

%environment
    # Basic Environment Setup
    export LC_ALL=en_US.UTF-8
    export LANG=en_US.UTF-8
    export LANGUAGE=en_US.UTF-8

%runscript
    # Custom Entry Point (Wrapper Script)
    if [ "$1" = "-i" ]; then
        echo "Entering Interactive Mode..."
        exec /bin/bash
    elif [ "$1" = "--help" ]; then
        echo "Help for [Your Software] Container:"
        echo "  -i                 : Enter interactive mode."
        echo "  --version-check    : Check if the current version is up to date."
        echo "  [Software Commands]: Execute any [Your Software]-specific command."
    elif [ "$1" = "--version-check" ]; then
        echo "You are running [Your Software] version X.X.X in this container."
        echo "Please check the official [Your Software] website for any updates."
    else
        echo "Executing [Your Software] command..."
        exec "$@"
    fi