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# Copyright 2019 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Helper context wrapper for diagnosing crbug.com/1001171.
This module and all uses thereof can and should be removed once
crbug.com/1001171 has been resolved.
"""
from __future__ import print_function
import contextlib
import os
import sys
@contextlib.contextmanager
def DumpStateOnLookupError():
"""Prints potentially useful state info in the event of a LookupError."""
try:
yield
except LookupError:
print('LookupError diagnosis for crbug.com/1001171:')
for path_index, path_entry in enumerate(sys.path):
desc = 'unknown'
if not os.path.exists(path_entry):
desc = 'missing'
elif os.path.islink(path_entry):
desc = 'link -> %s' % os.path.realpath(path_entry)
elif os.path.isfile(path_entry):
desc = 'file'
elif os.path.isdir(path_entry):
desc = 'dir'
print(' sys.path[%d]: %s (%s)' % (path_index, path_entry, desc))
real_path_entry = os.path.realpath(path_entry)
if (path_entry.endswith(os.path.join('lib', 'python2.7'))
and os.path.isdir(real_path_entry)):
encodings_dir = os.path.realpath(
os.path.join(real_path_entry, 'encodings'))
if os.path.exists(encodings_dir):
if os.path.isdir(encodings_dir):
print(' %s contents: %s' % (encodings_dir,
str(os.listdir(encodings_dir))))
else:
print(' %s exists but is not a directory' % encodings_dir)
else:
print(' %s missing' % encodings_dir)
raise
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