a cronnable little script to get the latest stable version from kernel.org, compare against current version, and run a build script

get_latest_linux_kernel.py

import os
import re
import click
import requests
from bs4 import BeautifulSoup

# Constants
KERNEL_ORG_URL = "https://www.kernel.org/"
VERSION_FILE = "latest_kernel_version.txt"
DOWNLOAD_DIR = "./downloads"

# Ensure the download directory exists
os.makedirs(DOWNLOAD_DIR, exist_ok=True)

@click.command()
@click.option('--build-script', default='build_linux.sh', help='The build script to run after downloading.')
def check_for_update(build_script):
    """
    Check for a new Linux kernel version and download it if available.
    """
    # Fetch the HTML content from kernel.org
    response = requests.get(KERNEL_ORG_URL)
    response.raise_for_status()  # Raise an exception for HTTP errors

    # Parse the HTML content
    soup = BeautifulSoup(response.text, 'html.parser')
    latest_button = soup.find(id="latest_button")
    if not latest_button:
        click.echo("Could not find the latest version button on kernel.org")
        return

    # Extract the download link and version number
    download_link = latest_button.find('a')['href']
    version_match = re.search(r'linux-(\d+\.\d+\.\d+)\.tar\.xz', download_link)
    if not version_match:
        click.echo("Could not extract the kernel version from the download link")
        return

    current_version = version_match.group(1)
    click.echo(f"Current latest kernel version: {current_version}")

    # Read the stored version
    previous_version = None
    if os.path.exists(VERSION_FILE):
        with open(VERSION_FILE, 'r') as file:
            previous_version = file.read().strip()

    # Compare versions and download if there's a new one
    if previous_version != current_version:
        click.echo("New kernel version available. Downloading...")
        download_response = requests.get(download_link)
        download_response.raise_for_status()

        # Save the downloaded file
        filename = os.path.join(DOWNLOAD_DIR, f"linux-{current_version}.tar.xz")
        with open(filename, 'wb') as file:
            file.write(download_response.content)

        # Update the stored version
        with open(VERSION_FILE, 'w') as file:
            file.write(current_version)

        # Run the build script
        os.system(f"./{build_script} {filename}")
    else:
        click.echo("No new kernel version available.")

if __name__ == "__main__":
    check_for_update()