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fix: deal with empty string and None values in s3 endpoint_url #1991

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4 changes: 3 additions & 1 deletion metaflow/metaflow_environment.py
Original file line number Diff line number Diff line change
Expand Up @@ -94,9 +94,11 @@ def _get_download_code_package_cmd(self, code_package_url, datastore_type):
bucket, s3_object = parse_s3_full_path(code_package_url)
# NOTE: the script quoting is extremely sensitive due to the way shlex.split operates and this being inserted
# into a quoted command elsewhere.
# NOTE: Reason for the extra conditionals in the script are because
# Boto3 does not play well with passing None or an empty string to endpoint_url
return "{python} -c '{script}'".format(
python=self._python(),
script='import boto3, os; boto3.client(\\"s3\\", endpoint_url=os.getenv(\\"METAFLOW_S3_ENDPOINT_URL\\")).download_file(\\"%s\\", \\"%s\\", \\"job.tar\\")'
script='import boto3, os; ep=os.getenv(\\"METAFLOW_S3_ENDPOINT_URL\\"; (boto3.client(\\"s3\\", endpoint_url=ep) if ep else boto3.client(\\"s3\\")).download_file(\\"%s\\", \\"%s\\", \\"job.tar\\")'
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would something like **(ep and {"endpoint_url":ep}) to specify endpoint_url help in reducing the number of chars used here?

% (bucket, s3_object),
)
elif datastore_type == "azure":
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