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fix: Use TARGETARCH for multi-platform builds #3

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Merged
lexfrei merged 2 commits into from
Feb 12, 2026
Merged

fix: Use TARGETARCH for multi-platform builds #3

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a33a73b
fix: Use TARGETARCH for multi-platform builds
lexfrei Feb 2, 2026
71eea82
fix: Use TARGETARCH in runtime stage for multi-platform builds
lexfrei Feb 10, 2026
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7 changes: 5 additions & 2 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,13 +1,16 @@
ARG FROM=alpine
FROM $FROM AS cni
ARG GOARCH=amd64
# TARGETARCH is automatically set by Docker buildx for multi-platform builds
ARG TARGETARCH
ARG GOARCH=${TARGETARCH:-amd64}
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@gemini-code-assist gemini-code-assist bot Feb 10, 2026

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high

This is a good change for supporting multi-platform builds in the cni stage. However, the second stage of this Dockerfile also depends on the architecture but has not been updated. The ARG GOARCH on line 12 is declared without a value, so when using buildx it will be empty. This will cause the COPY commands on lines 20-21 to fail.

To fully enable multi-platform builds as intended, you should apply the same pattern to the second build stage by adding ARG TARGETARCH and setting ARG GOARCH=${TARGETARCH:-amd64}.

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@lexfrei lexfrei Feb 10, 2026

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Good catch, fixed in 71eea82 — applied the same TARGETARCH pattern to the runtime stage.

ARG CNI_PLUGINS_VERSION=v1.1.1
RUN apk add --no-cache curl && \
curl -Lo cni.tar.gz https://github.com/containernetworking/plugins/releases/download/$CNI_PLUGINS_VERSION/cni-plugins-linux-$GOARCH-$CNI_PLUGINS_VERSION.tgz && \
tar -xf cni.tar.gz

FROM $FROM
ARG GOARCH
ARG TARGETARCH
ARG GOARCH=${TARGETARCH:-amd64}
ARG ALPINE_VERSION=v3.20
LABEL maintainer="squat <lserven@gmail.com>"
RUN echo -e "https://alpine.global.ssl.fastly.net/alpine/$ALPINE_VERSION/main\nhttps://alpine.global.ssl.fastly.net/alpine/$ALPINE_VERSION/community" > /etc/apk/repositories && \
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