Ruby services

service "ruby" "ruby-service" {
  git {
    url = "github.com/niwasawa/ruby-sinatra-hello-world"
  }

  vars = { port = net::pickport() }
  log  { format = "plain"  filter = "^\\tfrom .*" }

  runtime {
    cmd = ["bundle", "exec", "ruby", "myapp.rb", "-p", "${self.vars.port}"]
  }
}

Source

git or src, like Go (no crate). branch/tag/rev pin the revision; relative src resolves against the Alphasfile's directory.

Build & run

The default "build" is dependency install in the checkout:

bundle config set --local path vendor/bundle && bundle install

(--path was removed in Bundler 2.x, so the path is written to the per-checkout .bundle/config first — which also lets bundle exec find the gems at runtime.)

Ruby has no single binary, so the run command is not inferred — give an explicit runtime { cmd = [...] } (e.g. bundle exec ..., rails server, rackup). It runs with cwd = the per-invocation checkout, so Gemfile/app files resolve. Override the install step with build { cmd = [...] } if bundle install isn't what you want.

Logs

Ruby stack traces are noisy; log { format = "plain" filter = "<regex>" } drops matching lines (e.g. the from … backtrace frames) from the streamed output.