From fa56a74ba0ecf5a43fbb39d588b3c20a0f5a1a45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Javi=20Mart=C3=ADn?= <javim@elretirao.net>
Date: Thu, 9 Dec 2021 19:29:23 +0100
Subject: [PATCH] Activate sync mode for standard output

By default, in order to increase performance during IO operations, Ruby
doesn't immediately write to the standard output but uses a buffer
internally and writes the output in chunks [1].

It looks like this results in some output being missed when running
Docker Compose [2], so we're activating the sync mode, which flushes all
output immediately.

[1] https://ruby-doc.org/core-2.6.5/IO.html#method-i-sync-3D
[2] See issue 1118 in the sinatra/sinatra repository
---
 config/boot.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/config/boot.rb b/config/boot.rb
index 282011619..023130575 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -1,3 +1,5 @@
+$stdout.sync = true
+
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
 
 require "bundler/setup" # Set up gems listed in the Gemfile.