feat(cdk-assets-lib): support --build-context flag for docker image builds#1128
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aws-cdk-automation merged 4 commits intoaws:mainfrom Feb 25, 2026
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…uilds Add support for `dockerBuildContexts` in the cloud assembly schema and docker build logic. This allows passing additional named build contexts to the `docker build` command via the `--build-context` flag, enabling multi-context Docker builds where files can be sourced from directories, URLs, or other Docker images outside the primary build directory.
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## main #1128 +/- ##
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+ Coverage 87.75% 87.78% +0.02%
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Branches 1339 1339
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Hi @iankhou! Thanks for taking a look! I tested in conjunction with my PR to aws-cdk-lib here: aws/aws-cdk#36930 In that PR I added an integration test, and verified that it worked end to end with a linked copy of aws-cdk-cli. The key parts of the integration test were declaring the build context: const asset = new assets.DockerImageAsset(stack, 'DockerImageWithBuildContext', {
directory: path.join(__dirname, 'demo-image-build-context', 'image'),
buildContexts: {
mycontext: path.join(__dirname, 'demo-image-build-context', 'context'),
},
});And then using it in the Dockerfile: FROM public.ecr.aws/docker/library/python:3.12-slim
EXPOSE 8000
WORKDIR /src
ADD . /src
COPY --from=mycontext hello.txt /src/hello.txt
CMD ["python3", "index.py"]To deploy, my steps were roughly: Output: For a final end to end test, I created an ECS "Express Service" pointing at the image deployed by the integ test, and everything deployed successfully: 
(I've since torn the service down) |
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Add support for
dockerBuildContextsin the cloud assembly schema and docker build logic. This allows passing additional named build contexts to thedocker buildcommand via the--build-contextflag, enabling multi-context Docker builds where files can be sourced from directories, URLs, or other Docker images outside the primary build directory.This PR adds the CLI changes required to address aws/aws-cdk#31598
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license