Shift approach to requiring/validating name sourcedir

Author: claytonparnell

src/sagemaker/processing.py

@@ -1587,13 +1587,13 @@ def run(  # type: ignore[override]
                 framework script to run.Path (absolute or relative) to the local
                 Python source file which should be executed as the entry point
                 to training. When `code` is an S3 URI, ignore `source_dir`,
-                `dependencies, and `git_config`. If ``source_dir`` is specified,
+                `dependencies`, and `git_config`. If ``source_dir`` is specified,
                 then ``code`` must point to a file located at the root of ``source_dir``.
             source_dir (str): Path (absolute, relative or an S3 URI) to a directory
                 with any other processing source code dependencies aside from the entry
                 point file (default: None). If ``source_dir`` is an S3 URI, it must
-                point to a tar.gz file. Structure within this directory are preserved
-                when processing on Amazon SageMaker (default: None).
+                point to a file named `sourcedir.tar.gz`. Structure within this directory
+                are preserved when processing on Amazon SageMaker (default: None).
             dependencies (list[str]): A list of paths to directories (absolute
                 or relative) with any additional libraries that will be exported
                 to the container (default: []). The library folders will be
@@ -1730,9 +1730,16 @@ def _pack_and_upload_code(
                 "sagemaker_session unspecified when creating your Processor to have one set up "
                 "automatically."
             )
-
-        # Upload the bootstrapping code as s3://.../jobname/source/runproc.sh.
-        entrypoint_s3_uri = estimator.uploaded_code.s3_prefix.rsplit("/", 1)[0] + "/runproc.sh"
+        if ("sourcedir.tar.gz" in estimator.uploaded_code.s3_prefix):
+            # Upload the bootstrapping code as s3://.../jobname/source/runproc.sh.
+            entrypoint_s3_uri = estimator.uploaded_code.s3_prefix.replace(
+                "sourcedir.tar.gz",
+                "runproc.sh",
+            )
+        else:
+            raise RuntimeError(
+                "S3 source_dir file must be named `sourcedir.tar.gz.`"
+            )
 
         script = estimator.uploaded_code.script_name
         s3_runproc_sh = S3Uploader.upload_string_as_file_body(