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* lib/net/http.rb: Net::HTTP now automatically detects and uses 

proxies from the environment.  A proxy may also be specified as
  before.

  Net::HTTP::Proxy still creates anonymous classes, but these classes
  are only used to store configuration information.  When an HTTP
  instance is created the configuration is now copied.

  Additionally, Net::HTTP::ProxyDelta is no longer used by Net::HTTP

  [Feature #6546]
* lib/open-uri.rb:  Moved URI::Generic#find_proxy to uri/generic.
* lib/uri/generic.rb:  Imported find_proxy from open-uri.
* test/open-uri/test_open-uri.rb:  Moved proxy-discovery tests to URI.
* test/uri/test_generic.rb:  Imported proxy-discovery tests from
  open-uri.
* test/net/http/test_http.rb:  Added tests for proxy behavior.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@36476 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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drbrain 2012-07-20 01:56:21 +00:00
Родитель f35b1d0633
Коммит 9416becda4
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20
ChangeLog
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@ -1,3 +1,23 @@
Fri Jul 20 10:55:38 2012 Eric Hodel <drbrain@segment7.net>
* lib/net/http.rb: Net::HTTP now automatically detects and uses
proxies from the environment. A proxy may also be specified as
before.
Net::HTTP::Proxy still creates anonymous classes, but these classes
are only used to store configuration information. When an HTTP
instance is created the configuration is now copied.
Additionally, Net::HTTP::ProxyDelta is no longer used by Net::HTTP
[Feature #6546]
* lib/open-uri.rb: Moved URI::Generic#find_proxy to uri/generic.
* lib/uri/generic.rb: Imported find_proxy from open-uri.
* test/open-uri/test_open-uri.rb: Moved proxy-discovery tests to URI.
* test/uri/test_generic.rb: Imported proxy-discovery tests from
open-uri.
* test/net/http/test_http.rb: Added tests for proxy behavior.
Fri Jul 20 09:34:11 2012 Eric Hodel <drbrain@segment7.net>
* test/socket/test_socket.rb: Ignore IPv6 unique local addresses on OS

201
lib/net/http.rb
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@ -267,20 +267,20 @@ module Net #:nodoc:
#
# === Proxies
#
# Net::HTTP::Proxy has the same methods as Net::HTTP but its instances always
# connect via the proxy instead of directly to the given host.
# Net::HTTP will automatically create a proxy from the +http_proxy+
# environment variable if it is present. To disable use of +http_proxy+,
# pass +nil+ for the proxy address.
#
# You may also create a custom proxy:
#
# proxy_addr = 'your.proxy.host'
# proxy_port = 8080
#
# Net::HTTP::Proxy(proxy_addr, proxy_port).start('www.example.com') {|http|
# # always connect to your.proxy.addr:8080
# Net::HTTP.new('example.com', nil, proxy_addr, proxy_port).start { |http|
# # always proxy via your.proxy.addr:8080
# }
#
# Net::HTTP::Proxy returns a Net::HTTP instance when proxy_addr is nil so
# there is no need for conditional code.
#
# See Net::HTTP::Proxy for further details and examples such as proxies that
# See Net::HTTP.new for further details and examples such as proxies that
# require a username and password.
#
# === Compression
@ -577,16 +577,44 @@ module Net #:nodoc:
http.start(&block)
end
class << HTTP
alias newobj new
end
# Creates a new Net::HTTP object without opening a TCP connection or
# HTTP session.
# The +address+ should be a DNS hostname or IP address.
# If +p_addr+ is given, creates a Net::HTTP object with proxy support.
def HTTP.new(address, port = nil, p_addr = nil, p_port = nil, p_user = nil, p_pass = nil)
Proxy(p_addr, p_port, p_user, p_pass).newobj(address, port)
#
# The +address+ should be a DNS hostname or IP address, the +port+ is the
# port the server operates on. If no +port+ is given the default port for
# HTTP or HTTPS is used.
#
# If none of the +p_+ arguments are given, the proxy host and port are
# taken from the +http_proxy+ environment variable (or its uppercase
# equivalent) if present. If the proxy requires authentication you must
# supply it by hand. See URI::Generic#find_proxy for details of proxy
# detection from the environment. To disable proxy detection set +p_addr+
# to nil.
#
# If you are connecting to a custom proxy, +p_addr+ the DNS name or IP
# address of the proxy host, +p_port+ the port to use to access the proxy,
# and +p_user+ and +p_pass+ the username and password if authorization is
# required to use the proxy.
#
def HTTP.new(address, port = nil, p_addr = :ENV, p_port = nil, p_user = nil, p_pass = nil)
http = super address, port
if proxy_class? then # from Net::HTTP::Proxy()
http.proxy_from_env = @proxy_from_env
http.proxy_address = @proxy_address
http.proxy_port = @proxy_port
http.proxy_user = @proxy_user
http.proxy_pass = @proxy_pass
elsif p_addr == :ENV then
http.proxy_from_env = true
else
http.proxy_address = p_addr
http.proxy_port = p_port
http.proxy_user = p_user
http.proxy_pass = p_pass
end
http
end
# Creates a new Net::HTTP object for the specified server address,
@ -607,6 +635,14 @@ module Net #:nodoc:
@read_timeout = 60
@continue_timeout = nil
@debug_output = nil
@proxy_from_env = false
@proxy_uri = nil
@proxy_address = nil
@proxy_port = nil
@proxy_user = nil
@proxy_pass = nil
@use_ssl = false
@ssl_context = nil
@enable_post_connection_check = true
@ -646,6 +682,12 @@ module Net #:nodoc:
# The local port used to estabilish the connection.
attr_accessor :local_port
attr_writer :proxy_from_env
attr_writer :proxy_address
attr_writer :proxy_port
attr_writer :proxy_user
attr_writer :proxy_pass
# Number of seconds to wait for the connection to open. Any number
# may be used, including Floats for fractional seconds. If the HTTP
# object cannot open a connection in this many seconds, it raises a
@ -812,9 +854,17 @@ module Net #:nodoc:
private :do_start
def connect
D "opening connection to #{conn_address()}..."
if proxy? then
conn_address = proxy_address
conn_port = proxy_port
else
conn_address = address
conn_port = port
end
D "opening connection to #{conn_address}..."
s = Timeout.timeout(@open_timeout, Net::OpenTimeout) {
TCPSocket.open(conn_address(), conn_port(), @local_host, @local_port)
TCPSocket.open(conn_address, conn_port, @local_host, @local_port)
}
D "opened"
if use_ssl?
@ -891,6 +941,7 @@ module Net #:nodoc:
# no proxy
@is_proxy_class = false
@proxy_from_env = false
@proxy_addr = nil
@proxy_port = nil
@proxy_user = nil
@ -899,52 +950,26 @@ module Net #:nodoc:
# Creates an HTTP proxy class which behaves like Net::HTTP, but
# performs all access via the specified proxy.
#
# The arguments are the DNS name or IP address of the proxy host,
# the port to use to access the proxy, and a username and password
# if authorization is required to use the proxy.
#
# You can replace any use of the Net::HTTP class with use of the
# proxy class created.
#
# If +p_addr+ is nil, this method returns self (a Net::HTTP object).
#
# # Example
# proxy_class = Net::HTTP::Proxy('proxy.example.com', 8080)
#
# proxy_class.start('www.ruby-lang.org') {|http|
# # connecting proxy.foo.org:8080
# }
#
# You may use them to work with authorization-enabled proxies:
#
# proxy_host = 'your.proxy.example'
# proxy_port = 8080
# proxy_user = 'user'
# proxy_pass = 'pass'
#
# proxy = Net::HTTP::Proxy(proxy_host, proxy_port, proxy_user, proxy_pass)
# proxy.start('www.example.com') { |http|
# # always connect to your.proxy.example:8080 using specified username
# # and password
# }
#
# Note that net/http does not use the HTTP_PROXY environment variable.
# If you want to use a proxy, you must set it explicitly.
#
def HTTP.Proxy(p_addr, p_port = nil, p_user = nil, p_pass = nil)
# This class is obsolete. You may pass these same parameters directly to
# Net::HTTP.new. See Net::HTTP.new for details of the arguments.
def HTTP.Proxy(p_addr = :ENV, p_port = nil, p_user = nil, p_pass = nil)
return self unless p_addr
delta = ProxyDelta
proxyclass = Class.new(self)
proxyclass.module_eval {
include delta
# with proxy
Class.new(self) {
@is_proxy_class = true
@proxy_address = p_addr
@proxy_port = p_port || default_port()
@proxy_user = p_user
@proxy_pass = p_pass
if p_addr == :ENV then
@proxy_from_env = true
@proxy_address = nil
@proxy_port = nil
else
@proxy_address = p_addr
@proxy_port = p_port
end
@proxy_user = p_user
@proxy_pass = p_pass
}
proxyclass
end
class << HTTP
@ -967,29 +992,51 @@ module Net #:nodoc:
attr_reader :proxy_pass
end
# True if self is a HTTP proxy class.
# True if requests for this connection will be proxied
def proxy?
self.class.proxy_class?
if @proxy_from_env then
proxy_uri
else
@proxy_address
end
end
# A convenience method for accessing value of proxy_address from Net::HTTP.
# True if the proxy for this connection is determined from the environment
def proxy_from_env?
@proxy_from_env
end
# The proxy URI determined from the environment for this connection.
def proxy_uri # :nodoc:
@proxy_uri ||= URI("http://#{address}:#{port}").find_proxy
end
# The address of the proxy server, if one is configured.
def proxy_address
self.class.proxy_address
if @proxy_from_env then
proxy_uri.hostname
else
@proxy_address
end
end
# A convenience method for accessing value of proxy_port from Net::HTTP.
# The port of the proxy server, if one is configured.
def proxy_port
self.class.proxy_port
if @proxy_from_env then
proxy_uri.port
else
@proxy_port
end
end
# A convenience method for accessing value of proxy_user from Net::HTTP.
# The proxy username, if one is configured
def proxy_user
self.class.proxy_user
@proxy_user
end
# A convenience method for accessing value of proxy_pass from Net::HTTP.
# The proxy password, if one is configured
def proxy_pass
self.class.proxy_pass
@proxy_pass
end
alias proxyaddr proxy_address #:nodoc: obsolete
@ -997,18 +1044,22 @@ module Net #:nodoc:
private
# without proxy
# without proxy, obsolete
def conn_address
def conn_address # :nodoc:
address()
end
def conn_port
def conn_port # :nodoc:
port()
end
def edit_path(path)
path
if proxy? and not use_ssl? then
"http://#{addr_port}#{path}"
else
path
end
end
#

78
lib/open-uri.rb
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@ -696,84 +696,6 @@ module OpenURI
end
module URI
class Generic
# returns a proxy URI.
# The proxy URI is obtained from environment variables such as http_proxy,
# ftp_proxy, no_proxy, etc.
# If there is no proper proxy, nil is returned.
#
# Note that capitalized variables (HTTP_PROXY, FTP_PROXY, NO_PROXY, etc.)
# are examined too.
#
# But http_proxy and HTTP_PROXY is treated specially under CGI environment.
# It's because HTTP_PROXY may be set by Proxy: header.
# So HTTP_PROXY is not used.
# http_proxy is not used too if the variable is case insensitive.
# CGI_HTTP_PROXY can be used instead.
def find_proxy
name = self.scheme.downcase + '_proxy'
proxy_uri = nil
if name == 'http_proxy' && ENV.include?('REQUEST_METHOD') # CGI?
# HTTP_PROXY conflicts with *_proxy for proxy settings and
# HTTP_* for header information in CGI.
# So it should be careful to use it.
pairs = ENV.reject {|k, v| /\Ahttp_proxy\z/i !~ k }
case pairs.length
when 0 # no proxy setting anyway.
proxy_uri = nil
when 1
k, _ = pairs.shift
if k == 'http_proxy' && ENV[k.upcase] == nil
# http_proxy is safe to use because ENV is case sensitive.
proxy_uri = ENV[name]
else
proxy_uri = nil
end
else # http_proxy is safe to use because ENV is case sensitive.
proxy_uri = ENV.to_hash[name]
end
if !proxy_uri
# Use CGI_HTTP_PROXY. cf. libwww-perl.
proxy_uri = ENV["CGI_#{name.upcase}"]
end
elsif name == 'http_proxy'
unless proxy_uri = ENV[name]
if proxy_uri = ENV[name.upcase]
warn 'The environment variable HTTP_PROXY is discouraged. Use http_proxy.'
end
end
else
proxy_uri = ENV[name] || ENV[name.upcase]
end
if proxy_uri && self.hostname
require 'socket'
begin
addr = IPSocket.getaddress(self.hostname)
proxy_uri = nil if /\A127\.|\A::1\z/ =~ addr
rescue SocketError
end
end
if proxy_uri
proxy_uri = URI.parse(proxy_uri)
name = 'no_proxy'
if no_proxy = ENV[name] || ENV[name.upcase]
no_proxy.scan(/([^:,]*)(?::(\d+))?/) {|host, port|
if /(\A|\.)#{Regexp.quote host}\z/i =~ self.host &&
(!port || self.port == port.to_i)
proxy_uri = nil
break
end
}
end
proxy_uri
else
nil
end
end
end
class HTTP
def buffer_open(buf, proxy, options) # :nodoc:
OpenURI.open_http(buf, self, proxy, options)

76
lib/uri/generic.rb
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@ -1596,5 +1596,81 @@ module URI
return oth, self
end
# returns a proxy URI.
# The proxy URI is obtained from environment variables such as http_proxy,
# ftp_proxy, no_proxy, etc.
# If there is no proper proxy, nil is returned.
#
# Note that capitalized variables (HTTP_PROXY, FTP_PROXY, NO_PROXY, etc.)
# are examined too.
#
# But http_proxy and HTTP_PROXY is treated specially under CGI environment.
# It's because HTTP_PROXY may be set by Proxy: header.
# So HTTP_PROXY is not used.
# http_proxy is not used too if the variable is case insensitive.
# CGI_HTTP_PROXY can be used instead.
def find_proxy
name = self.scheme.downcase + '_proxy'
proxy_uri = nil
if name == 'http_proxy' && ENV.include?('REQUEST_METHOD') # CGI?
# HTTP_PROXY conflicts with *_proxy for proxy settings and
# HTTP_* for header information in CGI.
# So it should be careful to use it.
pairs = ENV.reject {|k, v| /\Ahttp_proxy\z/i !~ k }
case pairs.length
when 0 # no proxy setting anyway.
proxy_uri = nil
when 1
k, _ = pairs.shift
if k == 'http_proxy' && ENV[k.upcase] == nil
# http_proxy is safe to use because ENV is case sensitive.
proxy_uri = ENV[name]
else
proxy_uri = nil
end
else # http_proxy is safe to use because ENV is case sensitive.
proxy_uri = ENV.to_hash[name]
end
if !proxy_uri
# Use CGI_HTTP_PROXY. cf. libwww-perl.
proxy_uri = ENV["CGI_#{name.upcase}"]
end
elsif name == 'http_proxy'
unless proxy_uri = ENV[name]
if proxy_uri = ENV[name.upcase]
warn 'The environment variable HTTP_PROXY is discouraged. Use http_proxy.'
end
end
else
proxy_uri = ENV[name] || ENV[name.upcase]
end
if proxy_uri && self.hostname
require 'socket'
begin
addr = IPSocket.getaddress(self.hostname)
proxy_uri = nil if /\A127\.|\A::1\z/ =~ addr
rescue SocketError
end
end
if proxy_uri
proxy_uri = URI.parse(proxy_uri)
name = 'no_proxy'
if no_proxy = ENV[name] || ENV[name.upcase]
no_proxy.scan(/([^:,]*)(?::(\d+))?/) {|host, port|
if /(\A|\.)#{Regexp.quote host}\z/i =~ self.host &&
(!port || self.port == port.to_i)
proxy_uri = nil
break
end
}
end
proxy_uri
else
nil
end
end
end
end

161
test/net/http/test_http.rb
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@ -5,6 +5,167 @@ require 'net/http'
require 'stringio'
require_relative 'utils'
class TestNetHTTP < Test::Unit::TestCase
def test_class_Proxy
no_proxy_class = Net::HTTP.Proxy nil
assert_equal Net::HTTP, no_proxy_class
proxy_class = Net::HTTP.Proxy 'proxy.example', 8000, 'user', 'pass'
refute_equal Net::HTTP, proxy_class
assert_operator proxy_class, :<, Net::HTTP
assert_equal 'proxy.example', proxy_class.proxy_address
assert_equal 8000, proxy_class.proxy_port
assert_equal 'user', proxy_class.proxy_user
assert_equal 'pass', proxy_class.proxy_pass
http = proxy_class.new 'example'
refute http.proxy_from_env?
end
def test_class_Proxy_from_ENV
clean_http_proxy_env do
ENV['http_proxy'] = 'http://proxy.example:8000'
# These are ignored on purpose. See Bug 4388 and Feature 6546
ENV['http_proxy_user'] = 'user'
ENV['http_proxy_pass'] = 'pass'
proxy_class = Net::HTTP.Proxy :ENV
refute_equal Net::HTTP, proxy_class
assert_operator proxy_class, :<, Net::HTTP
assert_nil proxy_class.proxy_address
assert_nil proxy_class.proxy_user
assert_nil proxy_class.proxy_pass
refute_equal 8000, proxy_class.proxy_port
http = proxy_class.new 'example'
assert http.proxy_from_env?
end
end
def test_edit_path
http = Net::HTTP.new 'example', nil, nil
edited = http.send :edit_path, '/path'
assert_equal '/path', edited
http.use_ssl = true
edited = http.send :edit_path, '/path'
assert_equal '/path', edited
end
def test_edit_path_proxy
http = Net::HTTP.new 'example', nil, 'proxy.example'
edited = http.send :edit_path, '/path'
assert_equal 'http://example/path', edited
http.use_ssl = true
edited = http.send :edit_path, '/path'
assert_equal '/path', edited
end
def test_proxy_address
http = Net::HTTP.new 'example', nil, 'proxy.example'
assert_equal 'proxy.example', http.proxy_address
end
def test_proxy_address_ENV
clean_http_proxy_env do
ENV['http_proxy'] = 'http://proxy.example:8000'
http = Net::HTTP.new 'example'
assert_equal 'proxy.example', http.proxy_address
end
end
def test_proxy_eh_no_proxy
clean_http_proxy_env do
refute Net::HTTP.new('example', nil, nil).proxy?
end
end
def test_proxy_eh_ENV
clean_http_proxy_env do
ENV['http_proxy'] = 'http://proxy.example:8000'
http = Net::HTTP.new 'example'
assert http.proxy?
end
end
def test_proxy_eh_ENV_none_set
clean_http_proxy_env do
refute Net::HTTP.new('example').proxy?
end
end
def test_proxy_eh_ENV_no_proxy
clean_http_proxy_env do
ENV['http_proxy'] = 'http://proxy.example:8000'
ENV['no_proxy'] = 'example'
refute Net::HTTP.new('example').proxy?
end
end
def test_proxy_port
http = Net::HTTP.new 'exmaple', nil, 'proxy.example', 8000
assert_equal 8000, http.proxy_port
end
def test_proxy_port_ENV
clean_http_proxy_env do
ENV['http_proxy'] = 'http://proxy.example:8000'
http = Net::HTTP.new 'example'
assert_equal 8000, http.proxy_port
end
end
def clean_http_proxy_env
orig = {
'http_proxy' => ENV['http_proxy'],
'http_proxy_user' => ENV['http_proxy_user'],
'http_proxy_pass' => ENV['http_proxy_pass'],
'no_proxy' => ENV['no_proxy'],
}
orig.each_key do |key|
ENV.delete key
end
yield
ensure
orig.each do |key, value|
ENV[key] = value
end
end
end
module TestNetHTTP_version_1_1_methods
def test_s_get

35
test/open-uri/test_open-uri.rb
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@ -504,41 +504,6 @@ class TestOpenURI < Test::Unit::TestCase
# 192.0.2.0/24 is TEST-NET. [RFC3330]
def test_find_proxy
assert_nil(URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("ftp://192.0.2.1/").find_proxy)
with_env('http_proxy'=>'http://127.0.0.1:8080') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("ftp://192.0.2.1/").find_proxy)
}
with_env('ftp_proxy'=>'http://127.0.0.1:8080') {
assert_nil(URI("http://192.0.2.1/").find_proxy)
assert_equal(URI('http://127.0.0.1:8080'), URI("ftp://192.0.2.1/").find_proxy)
}
with_env('REQUEST_METHOD'=>'GET') {
assert_nil(URI("http://192.0.2.1/").find_proxy)
}
with_env('CGI_HTTP_PROXY'=>'http://127.0.0.1:8080', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
with_env('http_proxy'=>'http://127.0.0.1:8080', 'no_proxy'=>'192.0.2.2') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("http://192.0.2.2/").find_proxy)
}
end
def test_find_proxy_case_sensitive_env
with_env('http_proxy'=>'http://127.0.0.1:8080', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
with_env('HTTP_PROXY'=>'http://127.0.0.1:8081', 'REQUEST_METHOD'=>'GET') {
assert_nil(nil, URI("http://192.0.2.1/").find_proxy)
}
with_env('http_proxy'=>'http://127.0.0.1:8080', 'HTTP_PROXY'=>'http://127.0.0.1:8081', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
end unless RUBY_PLATFORM =~ /mswin|mingw/
def test_ftp_invalid_request
assert_raise(ArgumentError) { URI("ftp://127.0.0.1/").read }
assert_raise(ArgumentError) { URI("ftp://127.0.0.1/a%0Db").read }

49
test/uri/test_generic.rb
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@ -732,4 +732,53 @@ class URI::TestGeneric < Test::Unit::TestCase
URI::Generic.build2(path: "/foo bar/baz")
URI::Generic.build2(['http', nil, 'example.com', 80, nil, '/foo bar' , nil, nil, nil])
end
# 192.0.2.0/24 is TEST-NET. [RFC3330]
def test_find_proxy
assert_nil(URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("ftp://192.0.2.1/").find_proxy)
with_env('http_proxy'=>'http://127.0.0.1:8080') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("ftp://192.0.2.1/").find_proxy)
}
with_env('ftp_proxy'=>'http://127.0.0.1:8080') {
assert_nil(URI("http://192.0.2.1/").find_proxy)
assert_equal(URI('http://127.0.0.1:8080'), URI("ftp://192.0.2.1/").find_proxy)
}
with_env('REQUEST_METHOD'=>'GET') {
assert_nil(URI("http://192.0.2.1/").find_proxy)
}
with_env('CGI_HTTP_PROXY'=>'http://127.0.0.1:8080', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
with_env('http_proxy'=>'http://127.0.0.1:8080', 'no_proxy'=>'192.0.2.2') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
assert_nil(URI("http://192.0.2.2/").find_proxy)
}
end
def test_find_proxy_case_sensitive_env
with_env('http_proxy'=>'http://127.0.0.1:8080', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
with_env('HTTP_PROXY'=>'http://127.0.0.1:8081', 'REQUEST_METHOD'=>'GET') {
assert_nil(nil, URI("http://192.0.2.1/").find_proxy)
}
with_env('http_proxy'=>'http://127.0.0.1:8080', 'HTTP_PROXY'=>'http://127.0.0.1:8081', 'REQUEST_METHOD'=>'GET') {
assert_equal(URI('http://127.0.0.1:8080'), URI("http://192.0.2.1/").find_proxy)
}
end unless RUBY_PLATFORM =~ /mswin|mingw/
def with_env(h)
begin
old = {}
h.each_key {|k| old[k] = ENV[k] }
h.each {|k, v| ENV[k] = v }
yield
ensure
h.each_key {|k| ENV[k] = old[k] }
end
end
end