[WPT export] More temporary logging to debug crash

The working theory is that the locale isn't correctly set in the
Python process. The interactive shell on the bot does have a UTF-8
locale, but the environment of the Python process could be different. To
verify this, we add some more logging to wpt-export.

This CL will be reverted once the issue is resolved.

Bug: 891831
Change-Id: Ice6478a2b4f3805f2a68b4e2b782f0f23e9aeb99
Reviewed-on: https://chromium-review.googlesource.com/c/1261974Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596782}

third_party/blink/tools/blinkpy/w3c/local_wpt.py

@@ -94,11 +94,12 @@ class LocalWPT(object):
         # Remove Chromium WPT directory prefix.
         patch = patch.replace(CHROMIUM_WPT_DIR, '')
 
-        _log.info('Author: %s', author)
         if '<' in author:
             author_str = author
         else:
             author_str = '%s <%s>' % (author, author)
+        _log.info('Author: %s', repr(author_str))
+        _log.debug('Message:\n%s', repr(message))
 
         # TODO(jeffcarp): Use git am -p<n> where n is len(CHROMIUM_WPT_DIR.split(/'))
         # or something not off-by-one.

third_party/blink/tools/blinkpy/w3c/test_exporter.py

@@ -6,6 +6,7 @@
 
 import argparse
 import logging
+import sys
 
 from blinkpy.common.system.log_utils import configure_logging
 from blinkpy.w3c.local_wpt import LocalWPT
@@ -57,6 +58,10 @@ class TestExporter(object):
                        'your credentials up.')
             return False
 
+        # TODO(crbug.com/891831): temporary debug logging; remove afterwards.
+        _log.debug("LANG=%s", self.host.environ.get('LANG', ''))
+        _log.debug("filesystemencoding=%s", sys.getfilesystemencoding())
+
         self.wpt_github = self.wpt_github or WPTGitHub(self.host, credentials['GH_USER'], credentials['GH_TOKEN'])
         self.gerrit = self.gerrit or GerritAPI(self.host, credentials['GERRIT_USER'], credentials['GERRIT_TOKEN'])
         self.local_wpt = self.local_wpt or LocalWPT(self.host, credentials['GH_TOKEN'])