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sam build Fails in examples/fastapi Due to Missing Image Digest - Manual Docker Pull Required #607

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sam build Fails in examples/fastapi Due to Missing Image Digest - Manual Docker Pull Required#607

Description

Description

Running sam build in the examples/fastapi directory results in the following error:

(.venv) dhanuka@Dhanukas-MacBook-Pro metana-platform-file-handling-sam-app % sam build
Building codeuri: /Users/dhanuka/Development/github_repositories/metana-platfo rm-file-handling-sam-app runtime: None architecture: x86_64 functions: FastAPIFunction
Building image for FastAPIFunction function
Setting DockerBuildArgs for FastAPIFunction function
Failed building function FastAPIFunction
Step 1/8 : FROM public.ecr.aws/docker/library/python:3.12-slim
3.12-slim: Pulling from docker/library/python
f5cc5422ebcb: Pull complete
e3586b415667: Pull complete
59e22667830b: Pull complete
4c665aba06d1: Pull complete
Status: Downloaded newer image for public.ecr.aws/docker/library/python:3.12-slim ---> 9c1d9ed7593f
Step 2/8 : COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.9.1 /lambda-adapter /opt/extensions/lambda-adapter
0.9.1: Pulling from awsguru/aws-lambda-adapter
134595beb8b0: Pull complete
Status: Downloaded newer image for public.ecr.aws/awsguru/aws-lambda-adapter:0.9.1failed to export image: NotFound: content digest sha256:1efc3eb71726bfb67ec3c8e7359e30b6fbf840611bf078fa44050 b613b40b820: not found

Build Failed
Error: failed to export image: NotFound: content digest sha256:1efc3eb71726bfb67ec3c8e7359e30b6fbf840611bf078fa44050 b613b40b820: not found

This occurs during the Docker build step when executing:

COPY --from=public.ecr.aws/awsguru/aws-lambda-adapter:0.9.1 /lambda-adapter /opt/extensions/lambda-adapter

Temporary Solution

Manually pulling both required Docker images resolves the issue:

docker pull public.ecr.aws/docker/library/python:3.12-slim
docker pull public.ecr.aws/awsguru/aws-lambda-adapter:0.9.1

After doing this, sam build completes successfully.

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