Creating NodeJS Lambda - identical content, distinct SHA checksum

I'm encountering a perplexing issue and I can't seem to identify the root cause. Let me share my experience:

My objective is to utilize Terraform for managing Lambda functions, with CircleCI serving as the orchestrator. The process unfolds as follows:

GitHub repository -> CircleCI build (npm install && zip) -> aws s3 sync ZIP to S3 -> Terraform retrieves ZIP from S3 -> deploy to Lambda if SHA differs.

Everything operates smoothly except for one minor hiccup. Whenever I run the entire process twice without any modifications in the GitHub repository, Terraform consistently reports a new SHA hash:

source_code_hash: "mx56e7pMbBdftYHes+pETvjFZInvKsP92vtZ5URqyJY=" => "dhe66opfifDLEr7wI+Ie9UE6ioUiG8hTajuPhctA+W0="

It appears that the issue may be related to the npm install process, which could potentially produce slightly different outcomes each time. I doubt that zipping the folder should cause any trouble, as it's a straightforward zip -r file.zip *.

Could anyone provide an explanation for this behavior?

npmaws-lambdanode-modulesterraformcircleci

Answer №1

npm install with versions 4 or earlier can result in non-deterministic outcomes, meaning that your npm install may not produce the same results in different builds.

npm addressed this issue with version 5's package-lock.json. Consider updating to the latest version of npm to resolve this problem.

Alternatively, you can explore using yarn or pnpm, which are alternative package managers designed to ensure deterministic installs.

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