update-element.rb

#!/usr/bin/ruby
# frozen_string_literal: true

require 'json'
require 'open-uri'

BASE_API = 'https://api.github.com/repos/vector-im/element-web'

response = JSON.parse(URI.open("#{BASE_API}/releases").read)
asset_url = ''
asset_name = ''
response.each do |release|
  release_name = release['name']
  if release['prerelease']
    puts "Skipping prerelease #{release_name}..."
    next
  end
  puts "Downloading #{release_name}"

  asset_name = "element-#{release_name}.tar.gz"

  # All asset releases start with element-[...].tar.gz.
  # TODO: Is it worthwhile to ensure element-[...].tar.gz.asc exists as well?
  release['assets'].each do |asset|
    next if asset['name'] != asset_name

    asset_url = asset['browser_download_url']
  end

  break
end

if asset_url == ''
  puts 'Unable to find a suitable Element asset release. Exiting.'
  exit
end

# Download asset.
file_path = "/tmp/#{asset_name}"
File.open(file_path, 'w') do |f|
  f.write(URI.open(asset_url).read)
end

# Extract and clean up.
`tar --strip-components=1 --overwrite -C /var/www/riot.awau.uk -xvf #{file_path}`
File.delete(file_path)