Blame SOURCES/operating_system.rb

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module Gem
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  class << self
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    ##
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    # Returns full path of previous but one directory of dir in path
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    # E.g. for '/usr/share/ruby', 'ruby', it returns '/usr'
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    def previous_but_one_dir_to(path, dir)
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      return unless path
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      split_path = path.split(File::SEPARATOR)
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      File.join(split_path.take_while { |one_dir| one_dir !~ /^#{dir}$/ }[0..-2])
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    end
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    private :previous_but_one_dir_to
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    ##
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    # Detects --install-dir option specified on command line.
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    def opt_install_dir?
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      @opt_install_dir ||= ARGV.include?('--install-dir') || ARGV.include?('-i')
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    end
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    private :opt_install_dir?
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    ##
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    # Detects --build-root option specified on command line.
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    def opt_build_root?
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      @opt_build_root ||= ARGV.include?('--build-root')
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    end
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    private :opt_build_root?
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    ##
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    # Tries to detect, if arguments and environment variables suggest that
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    # 'gem install' is executed from rpmbuild.
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    def rpmbuild?
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      @rpmbuild ||= ENV['RPM_PACKAGE_NAME'] && (opt_install_dir? || opt_build_root?)
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    end
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    private :rpmbuild?
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    ##
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    # Get enabled SCLs in order of (most) dependent SCL to base SCL
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    def x_scls
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      @x_scls ||= if ENV['X_SCLS'].kind_of?(String)
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        ENV['X_SCLS'].split(' ').reverse!
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      else
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        []
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      end
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    end
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    private :x_scls
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    ##
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    # Additional default locations for enabled software collections
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    # Dependent scls needs to add themselves on $GEM_PATH
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    def default_locations_added_for_scls
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      if ENV['GEM_PATH']
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        gem_paths = ENV['GEM_PATH'].split(':')
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        x_scls.each do |scl|
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          next if scl == '@SCL@'
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          regexp = /#{scl}\/root\/usr\/share\/gems/
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          scl_gem_path = gem_paths.grep(regexp)[0]
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          if scl_gem_path
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            prefix = scl_gem_path.gsub(/\A(.*)#{regexp}\z/, "\\1")
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            @default_locations["#{scl}_system".to_sym] = "#{prefix}#{scl}/root/usr"
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            @default_locations["#{scl}_local".to_sym] = "#{prefix}#{scl}/root/usr/local"
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          end
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        end
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      end
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      @default_locations
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    end
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    private :default_locations_added_for_scls
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    ##
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    # SCL prefix genereatd from first detected SCL except own SCL.
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    def scl_prefix
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      prefix = x_scls.detect {|c| c != '@SCL@'}
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      prefix = prefix ? prefix + '_': nil
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      prefix
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    end
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    private :scl_prefix
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    ##
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    # Default gems locations allowed on FHS system (/usr, /usr/share).
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    # The locations are derived from directories specified during build
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    # configuration.
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    def default_locations
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      @default_locations ||= {
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        :system => previous_but_one_dir_to(RbConfig::CONFIG['vendordir'], RbConfig::CONFIG['RUBY_INSTALL_NAME']),
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        :local => previous_but_one_dir_to(RbConfig::CONFIG['sitedir'], RbConfig::CONFIG['RUBY_INSTALL_NAME'])
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      }
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      default_locations_added_for_scls
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    end
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    ##
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    # For each location provides set of directories for binaries (:bin_dir)
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    # platform independent (:gem_dir) and dependent (:ext_dir) files.
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    def default_dirs
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      @libdir ||= case RUBY_PLATFORM
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      when 'java'
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        RbConfig::CONFIG['datadir']
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      else
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        RbConfig::CONFIG['libdir']
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      end
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      @default_dirs ||= default_locations.inject(Hash.new) do |hash, location|
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        destination, path = location
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        hash[destination] = if path
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          {
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            :bin_dir => File.join(path, RbConfig::CONFIG['bindir'].split(File::SEPARATOR).last),
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            :gem_dir => File.join(path, RbConfig::CONFIG['datadir'].split(File::SEPARATOR).last, 'gems'),
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            :ext_dir => File.join(path, @libdir.split(File::SEPARATOR).last, 'gems')
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          }
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        else
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          {
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            :bin_dir => '',
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            :gem_dir => '',
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            :ext_dir => ''
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          }
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        end
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        hash
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      end
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    end
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    ##
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    # Remove methods we are going to override. This avoids "method redefined;"
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    # warnings otherwise issued by Ruby.
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    remove_method :operating_system_defaults if method_defined? :operating_system_defaults
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    remove_method :default_dir if method_defined? :default_dir
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    remove_method :default_path if method_defined? :default_path
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    remove_method :default_ext_dir_for if method_defined? :default_ext_dir_for
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    ##
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    # Regular user installs into user directory, root manages /usr/local.
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    def operating_system_defaults
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      unless opt_build_root?
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        options = if Process.uid == 0
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          "--install-dir=#{Gem.default_dirs[:local][:gem_dir]} --bindir #{Gem.default_dirs[:local][:bin_dir]}"
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        else
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          "--user-install --bindir #{File.join [Dir.home, 'bin']}"
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        end
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        {"gem" => options}
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      else
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        {}
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      end
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    end
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    ##
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    # RubyGems default overrides.
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    def default_dir
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      prefix = scl_prefix
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      if Gem.default_dirs.key?(:"#{prefix}system")
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        Gem.default_dirs[:"#{prefix}system"][:gem_dir]
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      else
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        Gem.default_dirs[:"system"][:gem_dir]
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      end
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    end
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    def default_path
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      path = default_dirs.collect {|location, paths| paths[:gem_dir]}
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      path.unshift Gem.user_dir if File.exist? Gem.user_home
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      path
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    end
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    def default_ext_dir_for base_dir
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      dir = if rpmbuild?
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        prefix = scl_prefix
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        build_dir = base_dir.chomp Gem.default_dirs[:"#{prefix}system"][:gem_dir]
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        if build_dir != base_dir
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          File.join build_dir, Gem.default_dirs[:"#{prefix}system"][:ext_dir]
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        end
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      else
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        dirs = Gem.default_dirs.detect {|location, paths| paths[:gem_dir] == base_dir}
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        dirs && dirs.last[:ext_dir]
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      end
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      dir && File.join(dir, RbConfig::CONFIG['RUBY_INSTALL_NAME'])
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    end
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    # This method should be available since RubyGems 2.2 until RubyGems 3.0.
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    # https://github.com/rubygems/rubygems/issues/749
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    if method_defined? :install_extension_in_lib
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      remove_method :install_extension_in_lib
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      def install_extension_in_lib
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        false
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      end
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    end
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  end
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end