brew/Library/Homebrew/simulate_system.rb

# typed: true
# frozen_string_literal: true

module Homebrew
  # Helper module for simulating different system condfigurations.
  #
  # @api private
  class SimulateSystem
    class << self
      extend T::Sig

      attr_reader :arch, :os

      sig { params(new_os: Symbol).void }
      def os=(new_os)
        os_options = [:macos, :linux, *MacOSVersions::SYMBOLS.keys]
        raise "Unknown OS: #{new_os}" unless os_options.include?(new_os)

        @os = new_os
      end

      sig { params(new_arch: Symbol).void }
      def arch=(new_arch)
        raise "New arch must be :arm or :intel" unless [:arm, :intel].include?(new_arch)

        @arch = new_arch
      end

      sig { void }
      def clear
        @os = @arch = nil
      end

      sig { returns(T::Boolean) }
      def simulating_or_running_on_macos?
        [:macos, *MacOSVersions::SYMBOLS.keys].include?(os)
      end

      sig { returns(T::Boolean) }
      def simulating_or_running_on_linux?
        os == :linux
      end

      sig { returns(Symbol) }
      def current_arch
        @arch || Hardware::CPU.type
      end

      sig { returns(Symbol) }
      def current_os
        os || :generic
      end
    end
  end
end

require "extend/os/simulate_system"