Refactor kube binary download (#393)

.github/workflows/ci.yaml

@@ -13,11 +13,6 @@ jobs:
     - run: make build
   build-kubetest2:
     runs-on: ubuntu-latest
-    strategy:
-      # don't bail out of all sub-tasks if one fails
-      fail-fast: false
-      matrix:
-        k8s_version: ["1.23", "1.24", "1.25", "1.26", "1.27", "1.28"]
     steps:
     - uses: actions/checkout@v3
-    - run: docker build --build-arg=KUBERNETES_MINOR_VERSION=${{ matrix.k8s_version }} --file Dockerfile.kubetest2 .
+    - run: docker build --build-arg=KUBERNETES_MINOR_VERSION=latest --file Dockerfile.kubetest2 .

Dockerfile.kubetest2

@@ -44,16 +44,11 @@ RUN wget -O eksctl.tar.gz "https://github.com/eksctl-io/eksctl/releases/${EKSCTL
     tar xzf eksctl.tar.gz -C /bin/ && \
     rm eksctl.tar.gz
 ARG KUBERNETES_MINOR_VERSION
-RUN wget -O kubernetes-version.txt https://storage.googleapis.com/kubernetes-release/release/stable-${KUBERNETES_MINOR_VERSION}.txt
+COPY hack/download-kubernetes-binaries.sh .
+RUN ./download-kubernetes-binaries.sh "${KUBERNETES_MINOR_VERSION}" "${TARGETOS}" "${TARGETARCH}"
 RUN mkdir /info
 ENV PATH=$PATH:/info
 RUN cp kubernetes-version.txt /info/
-RUN wget -O kubernetes-client.tar.gz https://storage.googleapis.com/kubernetes-release/release/$(cat kubernetes-version.txt)/kubernetes-client-${TARGETOS}-${TARGETARCH}.tar.gz && \
-    tar xzf kubernetes-client.tar.gz -C / && \
-    rm kubernetes-client.tar.gz
-RUN wget -O kubernetes-test.tar.gz https://storage.googleapis.com/kubernetes-release/release/$(cat kubernetes-version.txt)/kubernetes-test-${TARGETOS}-${TARGETARCH}.tar.gz && \
-    tar xzf kubernetes-test.tar.gz -C / && \
-    rm kubernetes-test.tar.gz
-RUN mv /kubernetes/*/bin/* /bin/
+RUN mv kubernetes/*/bin/* /bin/
 RUN rm -rf /workdir
 COPY --from=builder /usr/local/go/bin/* /bin/

hack/download-kubernetes-binaries.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+
+BUNDLES=(
+  "kubernetes-client"
+  "kubernetes-test"
+)
+
+if [ "$#" -ne 3 ]; then
+  echo >&2 "usage: $0 (KUBERNETES_MINOR_VERSION|latest) OS ARCH"
+  exit 1
+fi
+
+if [ "$1" = "latest" ]; then
+  RELEASE_MARKER="latest.txt"
+else
+  RELEASE_MARKER="latest-$1.txt"
+fi
+
+echo >&2 "Release marker: ${RELEASE_MARKER}"
+
+OS="$2"
+ARCH="$3"
+
+KUBERNETES_VERSION=$(curl --silent "https://storage.googleapis.com/kubernetes-release/release/${RELEASE_MARKER}")
+
+echo "Kubernetes version: ${KUBERNETES_VERSION}"
+echo "${KUBERNETES_VERSION}" > kubernetes-version.txt
+
+for BUNDLE in ${BUNDLES[@]}; do
+  echo >&2 "Downloading bundle: ${BUNDLE}"
+  TARBALL="${BUNDLE}.tar.gz"
+  wget --quiet --output-document=${TARBALL} https://storage.googleapis.com/kubernetes-release/release/${KUBERNETES_VERSION}/${BUNDLE}-${OS}-${ARCH}.tar.gz
+  tar xzf ${TARBALL}
+  rm ${TARBALL}
+done
+