fix-credential-process-without-stdin

[kernd]

in the ProcessProvider class, the _retrieve_credentials_using method uses the self._popen to open a subprocess. If there is no stdin attached to currently running program, then this call can result in an "handle is invalid" error on Windows. Adding the parameter stdin=subprocess.PIPE fixes the issue for this case.

[kernd]

here is an example traceback to show how this call can fail on the following code:

Code:

import boto3
import botocore.exceptions
from botocore import UNSIGNED
from botocore.config import Config

def check_aws_credentials():
    try:
        boto3.client('sts').get_caller_identity()
    except botocore.exceptions.NoCredentialsError:
        return False
    return True

Traceback:

  File "boto3\__init__.py", line 93, in client
  File "boto3\session.py", line 258, in client
  File "botocore\session.py", line 839, in create_client
  File "botocore\session.py", line 441, in get_credentials
  File "botocore\credentials.py", line 1975, in load_credentials
  File "botocore\credentials.py", line 961, in load
  File "botocore\credentials.py", line 980, in _retrieve_credentials_using
  File "subprocess.py", line 804, in __init__
  File "subprocess.py", line 1142, in _get_handles
OSError: [WinError 6] The handle is invalid

This failure was reproduced on Windows 10, using python 3.8.3

[kernd]

@nateprewitt do you know what are the next steps to get this looked at?

[tim-finnigan]

Checking in as there has not been any activity here in a while. I could not find any other reports of this issue, is it still something you're encountering on new versions of Boto3? If so please create a issue for further review and investigation.