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Created July 20, 2023 13:21
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Sharing Docker build ARG in multi-stage builds
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share-docker-build-arg-multi-stage.md

Sharing Docker build ARG in multi-stage builds

To share Docker build ARGs in a multi-stage build, simply declare it globally then mention it in subsequent builds to renew.

ARG IMG=alpine:3.14.2
FROM gcr.io/kaniko-project/executor:v1.9.0-debug AS kaniko

ARG IMG
FROM ${IMG}
RUN apk --update add \
  bash \
  coreutils \
  jq

COPY --from=kaniko /kaniko/warmer /kaniko/
COPY --from=kaniko /kaniko/executor /kaniko/
COPY --from=kaniko /kaniko/ssl /kaniko/
COPY --from=kaniko /kaniko/docker-credential-ecr-login /kaniko/
COPY --from=busybox:1.32.0 /bin /busybox

ENV PATH $PATH:/usr/local/bin:/kaniko:/busybox
ENV PATH $PATH:/usr/local/bin:/kaniko
ENV DOCKER_CONFIG /kaniko/.docker/
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