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Rake task to download .dat file in Rails

namespace :geoip do
  desc 'update geoip database'
  task :update do
    url = 'http://geolite.maxmind.com/download/geoip/database/GeoLiteCountry/GeoIP.dat.gz'
    system "curl #{url} | gzip -d > #{Rails.root.to_s}/db/geoip/GeoIP.dat"
  end
end

Capistrano

set :shared_children, shared_children + %w{db/geoip}