Disable usage of site_config boto file

tools/utils.py

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file contains a set of utilities functions used by other Python-based
 # scripts.
 
 import commands
 import contextlib
 import datetime
@@ skipping 684 matching lines @@
 
 class UnexpectedCrash(object):
   def __init__(self, test, pid, binary):
     self.test = test
     self.pid = pid
     self.binary = binary
 
   def __str__(self):
     return "%s: %s %s" % (self.test, self.binary, self.pid)
 
+class SiteConfigBotoFileDisabler(object):
+  def __init__(self):
+    self._old_aws = None
+    self._old_boto = None
+
+  def __enter__(self):
+    self._old_aws = os.environ.get('AWS_CREDENTIAL_FILE', None)
+    self._old_boto = os.environ.get('BOTO_CONFIG', None)
+
+    if self._old_aws:
+      del os.environ['AWS_CREDENTIAL_FILE']
+    if self._old_boto:
+      del os.environ['BOTO_CONFIG']
+
+  def __exit__(self, *_):
+    if self._old_aws:
+      os.environ['AWS_CREDENTIAL_FILE'] = self._old_aws
+    if self._old_boto:
+      os.environ['BOTO_CONFIG'] = self._old_boto
 
 class PosixCoredumpEnabler(object):
   def __init__(self):
     self._old_limits = None
 
   def __enter__(self):
     self._old_limits = resource.getrlimit(resource.RLIMIT_CORE)
 
     # Bump core limits to unlimited if core_pattern is correctly configured.
     if CheckLinuxCoreDumpPattern(fatal=False):
@@ skipping 110 matching lines @@
     try:
       crashes = self._find_unexpected_crashes()
       if crashes:
         # If we get a ton of crashes, only archive 10 dumps.
         archive_crashes = crashes[:10]
         print 'Archiving coredumps for crash (if possible):'
         for crash in archive_crashes:
           print '----> %s' % crash
 
         sys.stdout.flush()
-        self._archive(archive_crashes)
 
+        # We disable usage of the boto file installed on the bots due to an
+        # issue introduced by
+        # https://chrome-internal-review.googlesource.com/c/331136
+        with SiteConfigBotoFileDisabler():
+          self._archive(archive_crashes)
     finally:
       self._cleanup()
 
   def _archive(self, crashes):
     files = set()
     missing = []
     for crash in crashes:
       files.add(crash.binary)
       core = self._find_coredump_file(crash)
       if core:
@@ skipping 116 matching lines @@
     return contextlib.nested(WindowsCoredumpEnabler(),
                              WindowsCoreDumpArchiver())
   else:
     # We don't have support for MacOS yet.
     assert osname == 'macos'
     return NooptCoreDumpArchiver()
 
 if __name__ == "__main__":
   import sys
   Main()