[Capistrano - detect if a remote file exists] #ruby

file_exists.rb

def file_exists?(path)
  capture(:ls, path)
  true
rescue SSHKit::Command::Failed
  false
end

def state_page
  stage = fetch(:stage)
  parts = stage.to_s.split('_')
  "#{parts.first}.html"
end

def static_maintenance_page(root_path)
  custom = File.join(root_path, 'lib', 'maintenance', state_page)
  return custom if file_exists?(custom)

  File.join(root_path, 'lib', 'maintenance', 'maintenance.html')
end