1 files changed, 73 insertions, 0 deletions
diff --git a/src/python/grpcio/_spawn_patch.py b/src/python/grpcio/_spawn_patch.py
new file mode 100644
index 0000000000..24306f0dd9
--- /dev/null
+++ b/src/python/grpcio/_spawn_patch.py
@@ -0,0 +1,73 @@
+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Patches the spawn() command for windows compilers.
+
+Windows has an 8191 character command line limit, but some compilers
+support an @command_file directive where command_file is a file
+containing the full command line.
+"""
+
+from distutils import ccompiler
+import os
+import os.path
+import shutil
+import sys
+import tempfile
+
+MAX_COMMAND_LENGTH = 8191
+
+_classic_spawn = ccompiler.CCompiler.spawn
+
+def _commandfile_spawn(self, command):
+  command_length = sum([len(arg) for arg in command])
+  if os.name == 'nt' and command_length > MAX_COMMAND_LENGTH:
+    # Even if this command doesn't support the @command_file, it will
+    # fail as is so we try blindly
+    print('Command line length exceeded, using command file')
+    print(' '.join(command))
+    temporary_directory = tempfile.mkdtemp()
+    command_filename = os.path.abspath(
+    os.path.join(temporary_directory, 'command'))
+    with open(command_filename, 'w') as command_file:
+      escaped_args = ['"' + arg.replace('\\', '\\\\') + '"' for arg in command[1:]]
+      command_file.write(' '.join(escaped_args))
+    modified_command = command[:1] + ['@{}'.format(command_filename)]
+    try:
+      _classic_spawn(self, modified_command)
+    finally:
+      shutil.rmtree(temporary_directory)
+  else:
+    _classic_spawn(self, command)
+
+
+def monkeypatch_spawn():
+  """Monkeypatching is dumb, but it's either that or we become maintainers of
+     something much, much bigger."""
+  ccompiler.CCompiler.spawn = _commandfile_spawn