Gem::ConfigFile#unset_api_key!

# File tmp/rubies/ruby-4.1.0-preview1/lib/rubygems/config_file.rb, line 511
def unset_api_key!
  store = active_credential_store
  store_cleared =
    if store.nil?
      true
    elsif store.available?
      store.delete_all
    else
      # Failing here would make signout exit 1 on every platform without a
      # native store, and plain success would claim a removal nobody made.
      Gem::CredentialStore.warn_once "The credential store is enabled but unavailable, so any key it holds was left in place."
      true
    end

  file_removed =
    if File.exist?(credentials_path)
      # POSIX deletes a read-only file whenever the directory is writable, so
      # the marking has to be honored explicitly.
      if File.writable?(credentials_path)
        begin
          File.delete(credentials_path)
          true
        rescue SystemCallError
          false
        end
      else
        false
      end
    else
      false
    end

  [store_cleared, file_removed]
end