After updating to the Python (2.7) extensions for GAE to version 1.9.76, I am no longer able to run my code with dev_appserver.py:

```
$ dev_appserver.py --host localhost --api_port 65100 --admin_port 8000 --specified_service_ports default:8080,private:8081 public_services/public.yaml private_services/private.yaml
Traceback (most recent call last):
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 96, in <module>
_run_file(__file__, globals())
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 90, in _run_file
execfile(_PATHS.script_file(script_name), globals_)
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 617, in <module>
main()
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 605, in main
dev_server.start(options)
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 266, in start
env_variables=parsed_env_variables)
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 957, in __init__
env_variables)
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 140, in __init__
self._config_path)
File "/Users/wsorvis/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/application_configuration.py", line 518, in _parse_configuration
with open(configuration_path) as f:
IOError: [Errno 2] No such file or directory: 'public_services/public.yaml'
```

I examined a diff between the previous version and the latest version updated by gcloud, and I see a suspicious looking chdir:

```
$ diff -ru .install/.backup/platform/google_appengine/wrapper_util.py platform/google_appengine/wrapper_util.py
--- .install/.backup/platform/google_appengine/wrapper_util.py 1980-01-01 00:00:00.000000000 -0800
+++ platform/google_appengine/wrapper_util.py 1980-01-01 00:00:00.000000000 -0800
@@ -17,6 +17,7 @@
"""Finds the directory and target script name for App Engine SDK scripts."""

import os
+import subprocess
import sys

@@ -114,7 +115,16 @@

- self.grpc_path = os.path.join(dir_path, 'lib', 'grpcio-1.9.1')
+
+ grpc_importable = False
+ grpc_path = os.path.join(dir_path, 'lib', 'grpcio-1.9.1')
+ if os.path.exists(grpc_path):
+ os.chdir(grpc_path)
+
+
+ grpc_importable = not subprocess.call(
+ [sys.executable, '-c', 'import grpc'], stderr=subprocess.PIPE)
+ os.chdir(os.path.join('..', '..'))

self.v1_extra_paths = [
@@ -149,8 +159,9 @@
os.path.join(dir_path, 'lib', 'concurrent'),
os.path.join(dir_path, 'lib', 'ipaddr'),
os.path.join(dir_path, 'lib', 'portpicker'),
- self.grpc_path,
]
+ if grpc_importable:
+ self.api_server_extra_paths.append(grpc_path)

@@ -243,8 +254,9 @@
os.path.join(dir_path, 'lib', 'jinja2-2.6'),
os.path.join(dir_path, 'lib', 'webob-1.2.3'),
os.path.join(dir_path, 'lib', 'webapp2-2.5.1'),
- self.grpc_path,
]
+ if grpc_importable:
+ devappserver2_paths.append(grpc_path)
```

It looks as if part of the new grpc check chdir's to the grpcio directory, does a check, then it chdir's to "../.." (which would be the top-level directory for the GAE runtime for Python 2.7) instead of returning to the original working directory, so when I use relative paths to my services' app.yaml files, it fails.