Install custom python versions in unraid

install_python.sh

#!/usr/bin/env bash

# Modular Python installer with Docker fallback

set -e

# Help function
halp() {
    cat << EOF
Usage: $(basename "$0") [version]

Installs Python with Docker fallback if source compilation fails.

Arguments:
  version     Python version to install (default: 3.14.0rc1)

Examples:
  ./install_python.sh              # Installs 3.14.0rc1
  ./install_python.sh 3.13.0       # Installs 3.13.0
  ./install_python.sh 3.12.4       # Installs 3.12.4
  ./install_python.sh 3.15.0a1     # Installs 3.15.0a1

Options:
  -h, --help  Show this help message
EOF
}

# Check for help argument
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
    halp
    exit 0
fi

# Configuration - modularized
PYTHON_VERSION="${1:-3.14.0rc1}"  # Use argument or default
PYTHON_MAJOR=$(echo "$PYTHON_VERSION" | cut -d. -f1-2)
PYTHON_BASE_VERSION=$(echo "$PYTHON_VERSION" | sed 's/[a-z].*//')  # Remove rc/a/b suffixes

INSTALL_DIR="/usr/local/python${PYTHON_MAJOR//./}"
SOURCE_URL="https://www.python.org/ftp/python/${PYTHON_BASE_VERSION}/Python-${PYTHON_VERSION}.tgz"
DOCKER_TAG="${PYTHON_VERSION}-slim"

log_info() {
    echo "[INFO] $1"
}

log_error() {
    echo "[ERROR] $1"
}

# Download Python source
log_info "Downloading Python $PYTHON_VERSION source..."
cd /tmp
wget -O "Python-$PYTHON_VERSION.tgz" "$SOURCE_URL" || {
    log_error "Source not available. Using Docker approach..."

    # Alternative: Use Docker to compile
    log_info "Building in Docker container..."
    docker run --rm -v /usr/local:/host-usr-local python:${DOCKER_TAG} sh -c "
        cp -r /usr/local/bin/python* /host-usr-local/bin/ 2>/dev/null || true
        cp -r /usr/local/lib/python${PYTHON_MAJOR} /host-usr-local/lib/ 2>/dev/null || true
        cp -r /usr/local/lib/libpython* /host-usr-local/lib/ 2>/dev/null || true
        cp -r /usr/local/include/python${PYTHON_MAJOR} /host-usr-local/include/ 2>/dev/null || true
    "

    # Update library cache
    echo "/usr/local/lib" >> /etc/ld.so.conf.d/python${PYTHON_MAJOR//./}.conf
    ldconfig

    if command -v python${PYTHON_MAJOR} &> /dev/null; then
        log_info "Python $PYTHON_VERSION installed via Docker"
        python${PYTHON_MAJOR} --version
        exit 0
    fi

    log_error "Docker method failed"
    exit 1
}

# Extract and install
log_info "Installing..."
mkdir -p "$INSTALL_DIR"
tar -xzf "Python-$PYTHON_VERSION.tgz" -C "$INSTALL_DIR" --strip-components=1

# Create symlinks
ln -sf "$INSTALL_DIR/bin/python${PYTHON_MAJOR}" /usr/local/bin/python${PYTHON_MAJOR}
ln -sf "$INSTALL_DIR/bin/pip${PYTHON_MAJOR}" /usr/local/bin/pip${PYTHON_MAJOR}

# Update library paths
echo "$INSTALL_DIR/lib" > /etc/ld.so.conf.d/python${PYTHON_MAJOR//./}.conf
ldconfig

log_info "Python $PYTHON_VERSION installed successfully"
python${PYTHON_MAJOR} --version