Capistrano task for automatically installing a list of R libraries during an automated deployment.

support.rb

desc "install R packages"
task :install_R_packages do
  R_packages = File.read("#{release_path}/R_packages.txt").lines.map { |line| line.strip }

  R_package_cmd = R_packages.map do |package|
    'if(!require(\"'+package+'\")){ install.packages(\"'+package+'\",lib=c(\"'+shared_path+'/R\"), repos=\"http://cran.cnr.
berkeley.edu/\"); };'
  end.join(' ')

  sudo "sh -c 'if [ ! -d #{shared_path}/R ]; then mkdir #{shared_path}/R; fi'"
  sudo "sh -c 'export R_LIBS_USER=#{shared_path}/R && R --vanilla -e \"#{R_package_cmd}\"'"
end