Python 2.7 Installation Script

install_python_2.7.sh

#!/bin/bash

set -euo pipefail

# Check if running as root
if [[ $EUID -eq 0 ]]; then
    echo "This script should not be run as root; exiting..."
    exit 1
fi

# Set build directory from user input or command line argument
if [[ -z $1 ]]; then
    read -p "Enter Python dist path: " build_dir
else
    build_dir="$1"
fi

# Ensure build directory exists
mkdir -p "$build_dir"

# Navigate to build directory
cd "$build_dir" || {
    echo "Unable to navigate to build directory"
    exit 3
}

# Make a request to the API to get all latest versions of Python; store latest 2.7 version in a variable
py_versions=$(curl -s https://endoflife.date/api/python.json | grep -oE '"latest":"([^"]+)"' | awk -F'"' '{print $4}')
py_latest_2_7=$(echo "$py_versions" | grep -E '^2\.7\.' | sort -V | tail -n1)

# Set default value if latest 2.7 version is not found
if [[ -z $py_latest_2_7 ]]; then
    echo "Unable to find latest 2.7 version; setting to 2.7.18"
    py_latest_2_7="2.7.18"
fi

# Handle file locations
temp_dir=$(mktemp -d)
filename="$temp_dir/Python-$py_latest_2_7.tgz"
extract_dir="$temp_dir/extracted"
mkdir -p "$extract_dir"
extracted_dir="$extract_dir/Python-$py_latest_2_7"

# Download the latest version of Python
curl -o "$filename" "https://www.python.org/ftp/python/$py_latest_2_7/Python-$py_latest_2_7.tgz"

# Verify the MD5 checksum of the downloaded file
if [[ "$py_latest_2_7" == "2.7.18" ]]; then
    expected_md5="38c84292658ed4456157195f1c9bcbe1"
    actual_md5=$(md5sum "$filename" | awk '{print $1}')
    if [[ "$expected_md5" != "$actual_md5" ]]; then
        echo "MD5sum of downloaded file does not match expected value"
        exit 4
    fi
elif [[ ! -f "$filename" ]]; then
    echo "Unable to find downloaded file"
    exit 5
fi

# Extract the contents of the .tgz file; set extracted directory variable
tar -xf "$filename" -C "$extract_dir"

# Configure, build, and install Python
"$extracted_dir/configure" --prefix="$build_dir" --enable-optimizations --with-ensurepip=install --enable-shared --with-lto
make -j"$(nproc)"
make altinstall

# Clean up the temporary directory
rm -rf "$temp_dir"