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Fix kubectl-readonly Dockerfile to respect TARGETARCH #212

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Merged
imaustink merged 1 commit into from
Aug 18, 2026
Merged

Fix kubectl-readonly Dockerfile to respect TARGETARCH #212

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16 changes: 13 additions & 3 deletions tools/kubectl-readonly/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -38,12 +38,22 @@ FROM node:20-bookworm-slim AS runtime
# Pinned kubectl binary, verified against the official checksum published
# alongside the same release (fetched at build time rather than hardcoded,
# so the check stays correct if this ARG is bumped without also updating a
# stale hash). Bump KUBECTL_VERSION to upgrade.
# stale hash). Bump KUBECTL_VERSION to upgrade. TARGETARCH is set
# automatically by BuildKit (amd64/arm64) -- hardcoding amd64 here previously
# meant an arm64 host (e.g. Apple Silicon minikube) downloaded a binary that
# can't exec; the kernel's ENOEXEC fallback then re-runs the raw ELF bytes as
# a shell script, surfacing as "Syntax error: ")" unexpected".
ARG KUBECTL_VERSION=v1.31.2
ARG TARGETARCH
RUN apt-get update \
&& apt-get install -y --no-install-recommends ca-certificates curl \
&& curl -fsSL "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl" -o /usr/local/bin/kubectl \
&& curl -fsSL "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/amd64/kubectl.sha256" -o /tmp/kubectl.sha256 \
&& case "${TARGETARCH:-amd64}" in \
amd64) KUBECTL_ARCH=amd64 ;; \
arm64) KUBECTL_ARCH=arm64 ;; \
*) echo "unsupported TARGETARCH: ${TARGETARCH}" >&2; exit 1 ;; \
esac \
&& curl -fsSL "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/${KUBECTL_ARCH}/kubectl" -o /usr/local/bin/kubectl \
&& curl -fsSL "https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/linux/${KUBECTL_ARCH}/kubectl.sha256" -o /tmp/kubectl.sha256 \
&& echo "$(cat /tmp/kubectl.sha256) /usr/local/bin/kubectl" | sha256sum -c - \
&& chmod a+rx /usr/local/bin/kubectl \
&& apt-get purge -y curl \
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