You can download the seed package using awscli s3 cp <s3_uri> <target_path> or by using this URL: https://sagemaker-servicecatalog-seedcode-us-east-1.s3.amazonaws.com/bootstrap/GitRepositorySeedCodeCheckinCodeBuildProject-v1.0.zip
This .zip is used by CodeBuild that is called when the template is deployed (by a lambda mapped to a CFN custom component). If you take a look in the template you'll find a component named "SageMakerModelBuildSeedCodeCheckinProjectTriggerLambdaInvoker". You can find some env vars defined for this component like: SEEDCODE_BUCKET_NAME and SEEDCODE_BUCKET_KEY. These vars point to an S3 uri that has another .zip file with the content of the seed for the git repo. If you get the default values defined there you can re-create the URL and download the .zip file as well: https://sagemaker-servicecatalog-seedcode-us-east-1.s3.amazonaws.com/toolchain/model-building-workflow-jenkins-v1.0.zip
So, in the end, if you want to change the content that is pushed to the git repo, you can redefine these 2 vars and point to an S3 path that contains a .zip file you created.
Bonus: If you're a curious person, I recommend you to take a look at the .java file (src/main/java/GitRepositorySeedCodeBootStrapper.java) inside the .zip of the CodeBuild .zip for you to understand what it does to prepare the git repo like: download a .zip, unpack it, commit/push to the git repo.
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