# frozen_string_literal: true
module Bundler
class EnvironmentPreserver
INTENTIONALLY_NIL = "BUNDLER_ENVIRONMENT_PRESERVER_INTENTIONALLY_NIL"
BUNDLER_KEYS = %w[
BUNDLE_BIN_PATH
BUNDLE_GEMFILE
BUNDLER_VERSION
BUNDLER_SETUP
GEM_HOME
GEM_PATH
MANPATH
PATH
RB_USER_INSTALL
RUBYLIB
RUBYOPT
].map(&:freeze).freeze
BUNDLER_PREFIX = "BUNDLER_ORIG_"
def self.from_env
new(env_to_hash(ENV), BUNDLER_KEYS)
end
def self.env_to_hash(env)
to_hash = env.to_hash
return to_hash unless Gem.win_platform?
to_hash.each_with_object({}) {|(k,v), a| a[k.upcase] = v }
end
# @param env [Hash]
# @param keys [Array<String>]
def initialize(env, keys)
@original = env
@keys = keys
@prefix = BUNDLER_PREFIX
end
# Replaces `ENV` with the bundler environment variables backed up
def replace_with_backup
unless Gem.win_platform?
ENV.replace(backup)
return
end
# Fallback logic for Windows below to workaround
# https://bugs.ruby-lang.org/issues/16798. Can be dropped once all
# supported rubies include the fix for that.
ENV.clear
backup.each {|k, v| ENV[k] = v }
end
# @return [Hash]
def backup
env = @original.clone
@keys.each do |key|
value = env[key]
if !value.nil? && !value.empty?
env[@prefix + key] ||= value
elsif value.nil?
env[@prefix + key] ||= INTENTIONALLY_NIL
end
end
env
end
# @return [Hash]
def restore
env = @original.clone
@keys.each do |key|
value_original = env[@prefix + key]
next if value_original.nil? || value_original.empty?
if value_original == INTENTIONALLY_NIL
env.delete(key)
else
env[key] = value_original
end
env.delete(@prefix + key)
end
env
end
end
end
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