pvalena / rpms / ruby

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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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      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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    # 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(ConfigMap[:vendordir], ConfigMap[:RUBY_INSTALL_NAME]),
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        :local => previous_but_one_dir_to(ConfigMap[:sitedir], ConfigMap[:RUBY_INSTALL_NAME])
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      }
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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 ||= ConfigMap[:sitelibdir] == ConfigMap[:sitearchdir] ? ConfigMap[:datadir] : ConfigMap[:libdir]
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      @default_dirs ||= Hash[default_locations.collect do |destination, path|
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        [destination, {
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          :bin_dir => File.join(path, ConfigMap[:bindir].split(File::SEPARATOR).last),
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          :gem_dir => File.join(path, ConfigMap[: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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      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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      if Process.uid == 0
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        Gem.default_dirs[:local][:gem_dir]
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      else
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        Gem.user_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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    end
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    def default_bindir
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      if Process.uid == 0
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        Gem.default_dirs[:local][:bin_dir]
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      else
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        File.join [Dir.home, 'bin']
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      end
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    end
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    def default_ext_dir_for base_dir
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      dirs = Gem.default_dirs.detect {|location, paths| paths[:gem_dir] == base_dir}
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      dirs && File.join(dirs.last[:ext_dir], RbConfig::CONFIG['RUBY_INSTALL_NAME'])
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    end
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  end
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end