Feature request: Resolve symlinks in sam build

[bryandatanerds]

Describe your idea/feature/enhancement

As requested in #7865, I am opening this as we have a build pipeline that relies on symlinks outside of the build directory being mounted during sam build. Our process is to create a temporary build/ directory within our repo, symlink only the parts of the repo that should be included in the SAM application into there, and then run sam build --use-container with CodeUri pointed to the build directory. Symlinking saves us having to copy most of our source tree.

Proposal

We would appreciate if there were a way to tell sam build --use-container to mount symlinks outside the build tree.

Thank you!

[vicheey]

Thank you for creating this issue. I'll keep this request open for now to collect feedback from the community. With enough support, we will prioritize this feature request accordingly.

[paulflew]

+1

We use Github actions (aws-actions/setup-sam, etc) to build and deploy. Our source code contains symlinks to shared source files. Our current workaround is hard-coding SAM CLI v1.132.0 in .github/workflows/pipeline.yaml:

  - uses: aws-actions/setup-sam@v2
    with:
      version: 1.132.0

Would prefer to use a supported parameter instead.

[valerena]

There's a new parameter added in SAM CLI 1.134.0 called --mount-symlinks #7891 that keeps the previous behavior

It was just added to the documentation a couple of days ago: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-cli-command-reference-sam-build.html#ref-sam-cli-build-options-mount-symlinks

[vicheey]

Please bryandatanerds and paulflew, please let us know if --mount-symlinks resolves your issue.

[paulflew]

Yes, that's fixed our GitHub build issue. Thx for the quick response.

[mbfreder]

Closing this as the issue is fixed.

[github-actions]

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[bryandatanerds]

Works here too. Thank you very much for adding this back in!