Running boto3 from a python script executed in CodeBuild

Question

To put it very simple i have a python script that i expect to run in CodeBuild. 
Python script uses boto3 and when it gets executed i get an error stating i have no credentials.

```
response = self.client.get_parameters(Names=parameters, WithDecryption=with_decryption)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/client.py", line 530, in _api_call
    return self._make_api_call(operation_name, kwargs)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/client.py", line 943, in _make_api_call
    http, parsed_response = self._make_request(
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/client.py", line 966, in _make_request
    return self._endpoint.make_request(operation_model, request_dict)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/endpoint.py", line 119, in make_request
    return self._send_request(request_dict, operation_model)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/endpoint.py", line 198, in _send_request
    request = self.create_request(request_dict, operation_model)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/endpoint.py", line 134, in create_request
    self._event_emitter.emit(
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/hooks.py", line 412, in emit
    return self._emitter.emit(aliased_event_name, **kwargs)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/hooks.py", line 256, in emit
    return self._emit(event_name, kwargs)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/hooks.py", line 239, in _emit
    response = handler(**kwargs)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/signers.py", line 105, in handler
    return self.sign(operation_name, request)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/signers.py", line 189, in sign
    auth.add_auth(request)
","  File "/codebuild/output/src702091068/src/.tox/cloud/lib/python3.9/site-packages/botocore/auth.py", line 418, in add_auth
    raise NoCredentialsError()
","botocore.exceptions.NoCredentialsError: Unable to locate credentials
"]
```

The service i intend to access from CodeBuild system is in fact SSM Parameter Store. 
I've already granted permissions in the CodeBuild Service Role but i'm not quite sure why i keep getting NoCredentials.

If i run the script locally it all works fine.

Answer

Take a look at this: [Error: "Unable to locate credentials"](https://docs.aws.amazon.com/codebuild/latest/userguide/troubleshooting.html#troubleshooting-versions).

Answer

I wrote a python script to upload to AWS using boto3 and when I turn on debug level logging for boto3 and botocore, it shows where it's looking for credentials and what the result is.  I'm not sure this will help or not.  If you need an example of that, I can post the relevant code here.

Answer

If you only need to access a SSM parameter store parameter, you can use buildspec env section to get the parameter store as an environment variable.

Please refer https://docs.aws.amazon.com/codebuild/latest/userguide/build-spec-ref.html#build-spec.env.parameter-store for more details.

Running boto3 from a python script executed in CodeBuild

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