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Detect and download the most recent stable Ubuntu kernel version
require 'nokogiri'
require 'net/http'
require 'uri'
require 'byebug'
require 'open-uri'
class LinuxKernel
OFFICIAL_KERNEL_URL = 'https://www.kernel.org/'.freeze
UBUNTU_KERNEL_BASE_URL = 'http://kernel.ubuntu.com/~kernel-ppa/mainline/'.freeze
def initialize
@sections = {}
end
def exists?
File.directory? version
end
def version
return @version if @version
@version = Nokogiri::HTML(official_web_page).css('td#latest_link a').text
end
def available?
Net::HTTP.get_response(ubuntu_kernel_uri).is_a? Net::HTTPSuccess
end
def links_available?
files.all? do |kernel_file|
Net::HTTP.get_response(kernel_file[:uri]).is_a? Net::HTTPSuccess
end
end
def download!
Dir.mkdir version
files.each do |kernel_file|
print "- #{kernel_file[:basename]}"
download = open kernel_file[:uri]
IO.copy_stream(download, "#{version}/#{kernel_file[:basename]}")
puts " [downloaded]"
end
save_install_command
end
private
attr_reader :sections
def links
return @links if @links
detect_url_parts
@links = [
"linux-headers-#{sections[:first]}_#{sections[:second]}_all.deb",
"linux-headers-#{sections[:first]}-generic_#{sections[:second]}_amd64.deb",
"linux-image-#{sections[:first]}-generic_#{sections[:second]}_amd64.deb"
]
end
def files
links.map do |file|
{
basename: file,
uri: ubuntu_kernel_uri.tap { |uri| uri.path << file }
}
end
end
def save_install_command
File.open("#{version}/install_command.txt", "w") do |file|
file.puts 'sudo dpkg -i *.deb'
end
end
def detect_url_parts
page = Nokogiri::HTML ubuntu_kernel_page
link_text = page.css('a:contains("generic")').css('a:contains("amd64")').first.text
link_match = link_text.match(/linux-headers-(.+)-generic_(.+)_amd64/)
if link_match
@sections[:first] = link_match[1]
@sections[:second] = link_match[2]
end
end
def official_web_page
@official_web_page ||= Net::HTTP.get official_uri
end
def official_uri
URI.parse OFFICIAL_KERNEL_URL
end
def ubuntu_kernel_page
@ubuntu_kernel_page ||= Net::HTTP.get ubuntu_kernel_uri
end
def ubuntu_kernel_uri
URI.parse "#{UBUNTU_KERNEL_BASE_URL}v#{version}/"
end
end
linux_kernel = LinuxKernel.new
if linux_kernel.exists?
puts "You already downloaded the recent stable kernel [#{linux_kernel.version}]"
elsif linux_kernel.available?
puts "Downloading v#{linux_kernel.version}"
if linux_kernel.links_available?
linux_kernel.download!
puts "Done!"
puts ""
puts "Installing: sudo dpkg -i #{linux_kernel.version}/*.deb"
else
puts "Error checking the status of new kernel files"
end
end
@trueheart78

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Owner Author

commented Feb 4, 2018

Example output:

$ rb download_recent_stable_kernel.rb
Downloading v4.15.1
- linux-headers-4.15.1-041501_4.15.1-041501.201802031831_all.deb [downloaded]
- linux-headers-4.15.1-041501-generic_4.15.1-041501.201802031831_amd64.deb [downloaded]
- linux-image-4.15.1-041501-generic_4.15.1-041501.201802031831_amd64.deb [downloaded]
Done!

Installing: sudo dpkg -i 4.15.1/*.deb
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