Capistrano and systemd integration

Question

I'd like to keep my unit files in source control (e.g. in config), such that after a capistrano deploy, the unit will be copied to the systemd dir, and the service (e.g. puma) will be restarted. What would be the best way to achieve this?

I've thought simply adding a post-deploy task such as (untested code)

namespace :deploy do
[...]

  before :published, :systemd
  desc 'systemd'
  task :systemd do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      within release_path do
        execute "sudo cp config/puma.service /etc/systemd/system/puma.service"
        execute "sudo cp config/puma-init /usr/bin/puma-init"
        execute "sudo systemctl daemon-reload"
        execute "sudo systemctl restart puma"
      end
    end
  end
end

Answer 1

This seems to work, but I still wonder if there's a more elegant solution

namespace :deploy do
  [...]

  before :published, :systemd
  desc 'systemd integration'
  task :systemd do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
      within shared_path do
        execute "sudo cp #{shared_path}/config/puma.service /etc/systemd/system/puma.service"
        execute "sudo cp #{shared_path}/config/puma-init /usr/bin/puma-init"
        execute "sudo systemctl daemon-reload"
        execute "sudo systemctl restart puma"
      end
    end
  end
end

Also, note that you need to

set :pty, true

Otherwise sudo won't work.