Use the internal download() function rather than curl

cibuildwheel/windows.py

@@ -1,6 +1,5 @@
 from __future__ import print_function
 import os, tempfile, subprocess, shutil, sys
-from time import sleep
 from collections import namedtuple
 from glob import glob
 
@@ -9,12 +8,7 @@ try:
 except ImportError:
     from pipes import quote as shlex_quote
 
-try:
-    from urllib.request import urlopen
-except ImportError:
-    from urllib2 import urlopen
-
-from .util import prepare_command, get_build_verbosity_extra_flags
+from .util import prepare_command, get_build_verbosity_extra_flags, download
 
 
 IS_RUNNING_ON_AZURE = os.path.exists('C:\\hostedtoolcache')
@@ -64,28 +58,6 @@ def build(project_dir, output_dir, test_command, test_requires, test_extras, bef
         args = ['cmd', '/E:ON', '/V:ON', '/C'] + args
         return subprocess.check_call(' '.join(args), env=env, cwd=cwd)
 
-    def download(url, dest):
-        print('+ Download ' + url + ' to ' + dest)
-        dest_dir = os.path.dirname(dest)
-        if not os.path.exists(dest_dir):
-            os.makedirs(dest_dir)
-        repeat_num = 3
-        for i in range(repeat_num):
-            try:
-                response = urlopen(url)
-            except:
-                if i == repeat_num - 1:
-                    raise
-                sleep(3)
-                continue
-            break
-
-        try:
-            with open(dest, 'wb') as file:
-                file.write(response.read())
-        finally:
-            response.close()
-
     if IS_RUNNING_ON_AZURE or IS_RUNNING_ON_TRAVIS:
         shell = simple_shell
     else: