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|
# frozen_string_literal: true
##
#
# Gem::PathSupport facilitates the GEM_HOME and GEM_PATH environment settings
# to the rest of RubyGems.
#
class Gem::PathSupport
##
# The default system path for managing Gems.
attr_reader :home
##
# Array of paths to search for Gems.
attr_reader :path
##
# Directory with spec cache
attr_reader :spec_cache_dir # :nodoc:
##
# Whether `Gem.paths.home` defaulted to a user install or not.
attr_reader :auto_user_install
##
#
# Constructor. Takes a single argument which is to be treated like a
# hashtable, or defaults to ENV, the system environment.
#
def initialize(env)
# Current implementation of @home, which is exposed as `Gem.paths.home`:
# 1. If `env["GEM_HOME"]` is defined in the environment: `env["GEM_HOME"]`.
# 2. If `Gem.default_dir` is writable: `Gem.default_dir`.
# 3. Otherwise: `Gem.user_dir`.
if env.key?("GEM_HOME")
@home = normalize_home_dir(env["GEM_HOME"])
elsif File.writable?(Gem.default_dir)
@home = normalize_home_dir(Gem.default_dir)
else
# If `GEM_HOME` is not set AND we can't use `Gem.default_dir`,
# default to a user installation and set `@auto_user_install`.
@auto_user_install = true
@home = normalize_home_dir(Gem.user_dir)
end
@path = split_gem_path env["GEM_PATH"], @home
@spec_cache_dir = env["GEM_SPEC_CACHE"] || Gem.default_spec_cache_dir
end
private
def normalize_home_dir(home)
if File::ALT_SEPARATOR
home = home.gsub(File::ALT_SEPARATOR, File::SEPARATOR)
end
expand(home)
end
##
# Split the Gem search path (as reported by Gem.path).
def split_gem_path(gpaths, home)
# FIX: it should be [home, *path], not [*path, home]
gem_path = []
if gpaths
gem_path = gpaths.split(Gem.path_separator)
# Handle the path_separator being set to a regexp, which will cause
# end_with? to error
if /#{Gem.path_separator}\z/.match?(gpaths)
gem_path += default_path
end
if File::ALT_SEPARATOR
gem_path.map! do |this_path|
this_path.gsub File::ALT_SEPARATOR, File::SEPARATOR
end
end
gem_path << home
else
gem_path = default_path
end
gem_path.map {|path| expand(path) }.uniq
end
# Return the default Gem path
def default_path
Gem.default_path + [@home]
end
def expand(path)
if File.directory?(path)
File.realpath(path)
else
path
end
end
end
|
