module Bundler::BuildMetadata

def self.git_commit_sha
  return @git_commit_sha if instance_variable_defined? :@git_commit_sha
  # If Bundler has been installed without its .git directory and without a
  # commit instance variable then we can't determine its commits SHA.
  git_dir = File.expand_path("../../../.git", __dir__)
  if File.directory?(git_dir)
    return @git_commit_sha = IO.popen(%w[git rev-parse --short HEAD], { chdir: git_dir }, &:read).strip.freeze
  end
  @git_commit_sha ||= "unknown"
end