[アップデート] AWS SAM CLI でコンテナイメージビルド時に BuildKit が使えるようになりました

% sam --version
SAM CLI, version 1.159.1

FROM public.ecr.aws/lambda/python:3.12 AS builder

COPY requirements.txt /tmp/
RUN pip install --target /tmp/deps -r /tmp/requirements.txt

FROM public.ecr.aws/lambda/python:3.12

COPY --from=builder /tmp/deps ${LAMBDA_TASK_ROOT}/
COPY app.py ${LAMBDA_TASK_ROOT}/

CMD ["app.lambda_handler"]

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31

Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      PackageType: Image
      Architectures:
        - x86_64
    Metadata:
      DockerTag: python3.12-v1
      DockerContext: ./hello_world
      Dockerfile: Dockerfile

% sam build --no-use-buildkit

Building image for HelloWorldFunction function
Setting DockerBuildArgs for HelloWorldFunction function
Step 1/7 : FROM public.ecr.aws/lambda/python:3.12 AS builder
 ---> ceec420c0ff3
Step 2/7 : COPY requirements.txt /tmp/
 ---> 7abb3f927c67
Step 3/7 : RUN pip install --target /tmp/deps -r /tmp/requirements.txt
 ---> Running in 7f3def8d126c
...
Step 4/7 : FROM public.ecr.aws/lambda/python:3.12
 ---> ceec420c0ff3
Step 5/7 : COPY --from=builder /tmp/deps ${LAMBDA_TASK_ROOT}/
 ---> 2000febe5bbe
Step 6/7 : COPY app.py ${LAMBDA_TASK_ROOT}/
 ---> 6ad423c36888
Step 7/7 : CMD ["app.lambda_handler"]
 ---> Running in 72f1705d2622
Successfully built ff81d223976c
Successfully tagged helloworldfunction:python3.12-v1

Build Succeeded

% sam build --use-buildkit

Building image for HelloWorldFunction function
Setting DockerBuildArgs for HelloWorldFunction function
#0 building with "default" instance using docker driver

#1 [internal] load build definition from Dockerfile
#1 transferring dockerfile: 331B done
#1 DONE 0.0s

#2 [internal] load metadata for public.ecr.aws/lambda/python:3.12
#2 DONE 0.0s

#3 [internal] load .dockerignore
#3 transferring context: 2B done
#3 DONE 0.0s

#4 [builder 1/3] FROM public.ecr.aws/lambda/python:3.12
#4 CACHED

#5 [internal] load build context
#5 transferring context: 63B done
#5 DONE 0.0s

#6 [builder 2/3] COPY requirements.txt /tmp/
#6 DONE 0.0s

#7 [builder 3/3] RUN pip install --target /tmp/deps -r /tmp/requirements.txt
#7 2.535 Collecting requests (from -r /tmp/requirements.txt (line 1))
...
#7 DONE 6.4s

#8 [stage-1 2/3] COPY --from=builder /tmp/deps /var/task/
#8 DONE 0.0s

#9 [stage-1 3/3] COPY app.py /var/task/
#9 DONE 0.0s

#10 exporting to image
#10 exporting layers 0.0s done
#10 writing image sha256:8d99dbbe21f28a07fe3c4e2c9f3362008f5b0fa4c999078cc2ec969c149e7d9d done
#10 naming to docker.io/library/helloworldfunction:python3.12-v1 done
#10 DONE 0.0s

Build Succeeded