[calm - Cygwin server-side packaging maintenance script] branch master, updated. 20200401-9-g8320035

[Jon TURNEY <jturney@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=cygwin-apps/calm.git;h=832003502e6d2cb5dd1eeb52bf3bd1e7ea2e2635

commit 832003502e6d2cb5dd1eeb52bf3bd1e7ea2e2635
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Mon Apr 13 16:46:27 2020 +0100

    Add a tool for demonstrating version sort

https://sourceware.org/git/gitweb.cgi?p=cygwin-apps/calm.git;h=1e59f9df68ad944cf05a1e0ebd8c7e6631d3d866

commit 1e59f9df68ad944cf05a1e0ebd8c7e6631d3d866
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Mon Apr 13 15:51:36 2020 +0100

    Enhance homepage fixing
    
    Handle:
    * Trivial terminal '/' redirects
    * 308 Permanent Redirect as well as 301 Moved Permanently
    * sites which block urllib's default user-agent
    * Slow to respond sites with a timeout


Diff:
---
 calm/fixes.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/calm/fixes.py b/calm/fixes.py
index a89896a..33c1087 100644
--- a/calm/fixes.py
+++ b/calm/fixes.py
@@ -26,6 +26,7 @@ import logging
 import os
 import re
 import shutil
+import socket
 import tarfile
 import urllib.request
 import urllib.error
@@ -72,11 +73,12 @@ class NoRedirection(urllib.request.HTTPErrorProcessor):
 def follow_redirect(homepage):
     opener = urllib.request.build_opener(NoRedirection)
     opener.addheaders = [('User-Agent', 'calm')]
+    request = urllib.request.Request(homepage, method='HEAD')
     try:
-        response = opener.open(homepage)
+        response = opener.open(request, timeout=60)
         if response.code in [301, 308]:
             return response.headers['Location']
-    except (ConnectionResetError, ValueError, urllib.error.URLError) as e:
+    except (ConnectionResetError, ValueError, socket.timeout, urllib.error.URLError) as e:
         logging.warning('error %s checking homepage:%s' % (e, homepage))
     return homepage