Example rake task that downloads CI artifacts to publish nuget packages to the official feed

publish_nuget.rb

desc "Downloads from CI and pushes nuget packages to the official feed"
task :release, [:package] do |t, args|
  require 'open-uri'
  release_path = "#{buildsupport_path}/nuget_release"
  clean_dir release_path

# The @teamcity_build_id is a unique identifier for the build configuration (looks like "bt234"). You can usually figure it out from your project url
  artifact_url = "http://teamcity.codebetter.com/guestAuth/repository/downloadAll/#{@teamcity_build_id}/.lastSuccessful/artifacts.zip"
  puts "downloading artifacts from teamcity.codebetter.com"
  artifact = open(artifact_url)
  unzip_file artifact.path, release_path
  FileList["#{release_path}/*.nupkg"].exclude(".symbols.nupkg").each do |nupkg|
    next if args[:package] && Nuget.package_name(nupkg).downcase != args[:package].downcase
    sh "#{nuget} push #{nupkg}" do |ok, res|
      puts "May not have published #{nupkg}" unless ok
    end
  end
end	

def clean_dir(path)
  mkdir_p path, :verbose => false
  rm_r Dir.glob(File.join(path, "*.*")), :verbose => false
end
      
def unzip_file (file, destination)
  require 'rubygems'
  require 'zip/zip'
  Zip::ZipFile.open(file) { |zip_file|
   zip_file.each { |f|
     f_path=File.join(destination, f.name)
     FileUtils.mkdir_p(File.dirname(f_path))
     zip_file.extract(f, f_path) unless File.exist?(f_path)
   }
  }
end