[travis] Retry. (#221)

.travis.yml

@@ -32,7 +32,7 @@ os: linux
 cache:
   directories:
     - build/clang+llvm-5.0.1-x86_64-linux-gnu-ubuntu-14.04/
-    - build/clang+llvm-5.0.1-final-x86_64-apple-darwin/
+    - build/clang+llvm-5.0.1-x86_64-apple-darwin/
 
 matrix:
   fast_finish: true
@@ -193,7 +193,7 @@ before_script:
   - ${CXX} --version
 
 script:
-  - ./waf configure
+  - travis_retry ./waf configure
   - ./waf build
   - ./build/release/bin/cquery --log-all-to-stderr --test-unit
   - ./build/release/bin/cquery --log-all-to-stderr --test-index

wscript

@@ -2,9 +2,9 @@
 # encoding: utf-8
 
 try:
-    from urllib2 import urlopen, URLError # Python 2
+    from urllib2 import urlopen  # Python 2
 except ImportError:
-    from urllib.request import urlopen, URLError # Python 3
+    from urllib.request import urlopen  # Python 3
 
 import os.path
 import string
@@ -100,13 +100,7 @@ def download_and_extract(destdir, url, ext):
       print('   destination: {0}'.format(dest))
       print('   source:      {0}'.format(url))
       # TODO: verify checksum
-      for _ in range(5):
-        try:
       response = urlopen(url, timeout=60)
-          break
-        except URLError:
-          print('Retry')
-          continue
       with open(dest, 'wb') as f:
         f.write(response.read())
     else: