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How to create an arbitrary large size Ruby gem

Create a gem skeleton.

Bundler: How to create a Ruby gem with Bundler

bundle gem my-gem

Create a random binary data.

# 2GB data
dd if=/dev/urandom of=blob bs=1m count=2000

Modify .gemspec file.

# frozen_string_literal: true

require_relative "lib/my/gem/version"

Gem::Specification.new do |spec|
  spec.name          = "my-gem"
  spec.version       = My::Gem::VERSION
  spec.authors       = ["Kensuke Nagae"]
  spec.email         = ["kyanny@gmail.com"]

  spec.summary       = ": Write a short summary, because RubyGems requires one."
  spec.description   = ": Write a longer description or delete this line."
  spec.homepage      = "https://example.com/"
  spec.required_ruby_version = ">= 2.4.0"

  spec.metadata["allowed_push_host"] = "https://rubygems.pkg.github.com/"

  spec.metadata["homepage_uri"] = spec.homepage
  spec.metadata["source_code_uri"] = "https://example.com/"
  spec.metadata["changelog_uri"] = "https://example.com/changelog"

  # Specify which files should be added to the gem when it is released.
  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
  spec.files = Dir.chdir(File.expand_path(__dir__)) do
    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{\A(?:test|spec|features)/}) } + ['blob']
  spec.bindir        = "exe"
  spec.executables   = spec.files.grep(%r{\Aexe/}) { |f| File.basename(f) }
  spec.require_paths = ["lib"]

  # Uncomment to register a new dependency of your gem
  # spec.add_dependency "example-gem", "~> 1.0"

  # For more information and examples about making a new gem, checkout our
  # guide at: https://bundler.io/guides/creating_gem.html

Build a gem.

gem build my-gem.gemspec

Check the gem size.

❯ ls -lah
-rw-r--r--   1 kyanny  staff   1.9G 10 21 17:31 blob
-rw-r--r--   1 kyanny  staff   1.9G 10 21 18:15 my-gem-0.1.0.gem
-rw-r--r--   1 kyanny  staff   1.4K 10 21 17:34 my-gem.gemspec

Publish to GitHub Packages RubyGems registry

Working with the RubyGems registry - GitHub Docs

Set a credentials.


:github: Bearer TOKEN

Push the gem.

  • OWNER is username
  • Repository my-gem must exist
gem push --key github --host https://rubygems.pkg.github.com/OWNER my-gem-0.0.1.gem