skip uploading assets when there is no diff

[rittneje]

Describe the feature

cdk deploy should detect whether this is actually a diff for the stack in question before uploading the assets for it. If there isn't then it should skip uploading them.

Use Case

We follow IaC, which means that we always run cdk deploy for all stacks on every build. Consequently, often times there are no changes at all to deploy for a certain stack (or several stacks). But we've noticed that cdk does not detect this until after it uploads the assets to the staging bucket, which wastes time.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.21.1 (build a6ee543)

Environment details (OS name and version, etc.)

Alpine 3.15, Python 3.9.12

[peterwoodworth]

Thanks for the request @rittneje,

This is being tracked here #18045. There's a proof of concept up for the feature for anyone to take over 🙂

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[rittneje]

@peterwoodworth #18045 seems completely unrelated to this. That is about cdk watch skipping synthesis. This is about cdk deploy deferring uploading assets until after it has determined there is a diff. Please re-open this issue.

[peterwoodworth]

You're right - I'm not sure what I read initially

[rix0rrr]

Has been implemented already

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