Gem::Commands::SignoutCommand#execute

# File tmp/rubies/ruby-3.2.0/lib/rubygems/commands/signout_command.rb, line 18
def execute
  credentials_path = Gem.configuration.credentials_path

  if !File.exist?(credentials_path)
    alert_error "You are not currently signed in."
  elsif !File.writable?(credentials_path)
    alert_error "File '#{Gem.configuration.credentials_path}' is read-only."\
                " Please make sure it is writable."
  else
    Gem.configuration.unset_api_key!
    say "You have successfully signed out from all sessions."
  end
end