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Support .in Dockerfiles with minimal built-in preprocessing#1226

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Mathiyarasy wants to merge 3 commits into
devcontainers:mainfrom
Mathiyarasy:dev/Mathi/CliPd
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Support .in Dockerfiles with minimal built-in preprocessing#1226
Mathiyarasy wants to merge 3 commits into
devcontainers:mainfrom
Mathiyarasy:dev/Mathi/CliPd

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@Mathiyarasy Mathiyarasy commented May 13, 2026

The Dev Containers identifies the last FROM target in the Dockerfile and then extends it with features. If a Dockerfile.in does not contain a resolved FROM instruction before preprocessing, this results in an error.

@Mathiyarasy Mathiyarasy changed the title Include preprocessing file Adds limited built-in preprocessing support for .in Dockerfiles used by Dev Containers May 18, 2026
@Mathiyarasy Mathiyarasy changed the title Adds limited built-in preprocessing support for .in Dockerfiles used by Dev Containers Support .in Dockerfiles with minimal built-in preprocessing May 18, 2026
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