test: add safe Sprig Kubernetes preflight

Co-authored-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@buzz.block.builderlab.xyz> Signed-off-by: npub1t2tgm7d8f995uqvmnm8h88sg3wnpp9a5xysjf6dg3tjmgt3ltulqdp8ehr <5a968df9a7494b4e019b9ecf739e088ba61097b4312124e9a88ae5b42e3f5f3e@buzz.block.builderlab.xyz>
2026-08-18 06:50:31 +02:00 · 2026-08-02 01:42:31 -04:00
parent 6f3490dd36
commit 3a9b189720
1 changed files with 97 additions and 0 deletions
@@ -0,0 +1,97 @@
+#!/usr/bin/env bash
+# Prove that a cluster can resolve and start the exact digest-qualified Sprig
+# image that will be passed to the Kubernetes provider. This is intentionally a
+# separate preflight: a Docker image existing in the host daemon does not imply
+# that the kubelet's container runtime can resolve the same name and digest.
+set -euo pipefail
+
+: "${BUZZ_K8S_TEST_CONTEXT:?set the explicit disposable/local kubectl context}"
+: "${BUZZ_SPRIG_IMAGE:?set an immutable image reference (name@sha256:<64 hex>)}"
+
+if [[ ! "$BUZZ_SPRIG_IMAGE" =~ ^[^[:space:]@]+@sha256:[0-9a-fA-F]{64}$ ]]; then
+    echo "error: BUZZ_SPRIG_IMAGE must be name@sha256:<64 hex>" >&2
+    exit 2
+fi
+
+CONTEXT="$BUZZ_K8S_TEST_CONTEXT"
+IMAGE="$BUZZ_SPRIG_IMAGE"
+PULL_POLICY="${BUZZ_K8S_TEST_PULL_POLICY:-IfNotPresent}"
+case "$PULL_POLICY" in
+    Always|IfNotPresent|Never) ;;
+    *) echo "error: invalid BUZZ_K8S_TEST_PULL_POLICY: $PULL_POLICY" >&2; exit 2 ;;
+esac
+
+MANAGED_BY="buzz-backend-kubernetes"
+BINDING_VERSION="v1"
+NAMESPACE="buzz-k8s-sprig-$(date +%s)-$RANDOM"
+CREATED=0
+
+cleanup() {
+    (( CREATED == 1 )) || return 0
+    local managed binding foreign
+    managed="$(kubectl --context "$CONTEXT" get namespace "$NAMESPACE" \
+        -o jsonpath='{.metadata.labels.app\.kubernetes\.io/managed-by}' 2>/dev/null || true)"
+    binding="$(kubectl --context "$CONTEXT" get namespace "$NAMESPACE" \
+        -o jsonpath='{.metadata.labels.buzz\.block\.xyz/binding-version}' 2>/dev/null || true)"
+    if [[ "$managed" != "$MANAGED_BY" || "$binding" != "$BINDING_VERSION" ]]; then
+        echo "REFUSING cleanup: namespace ownership markers changed: $NAMESPACE" >&2
+        return 1
+    fi
+    foreign="$(kubectl --context "$CONTEXT" --namespace "$NAMESPACE" get pods -o json \
+        | jq '[.items[] | select(.metadata.labels["app.kubernetes.io/managed-by"] != "buzz-backend-kubernetes" or .metadata.labels["buzz.block.xyz/binding-version"] != "v1")] | length')"
+    if [[ "$foreign" != 0 ]]; then
+        echo "REFUSING cleanup: namespace contains an unowned pod: $NAMESPACE" >&2
+        return 1
+    fi
+    kubectl --context "$CONTEXT" delete namespace "$NAMESPACE" --wait=true
+}
+trap cleanup EXIT
+
+# Fail before mutation if the named context is absent or inaccessible. Print the
+# cluster identity so evidence cannot be mistaken for a different kubeconfig.
+kubectl config get-contexts "$CONTEXT" >/dev/null
+SERVER="$(kubectl config view --minify --context "$CONTEXT" -o jsonpath='{.clusters[0].cluster.server}')"
+kubectl --context "$CONTEXT" get nodes -o name >/dev/null
+printf 'context=%s\nserver=%s\nimage=%s\npull_policy=%s\nnamespace=%s\n' \
+    "$CONTEXT" "$SERVER" "$IMAGE" "$PULL_POLICY" "$NAMESPACE"
+
+kubectl --context "$CONTEXT" create namespace "$NAMESPACE"
+CREATED=1
+kubectl --context "$CONTEXT" label namespace "$NAMESPACE" \
+    "app.kubernetes.io/managed-by=$MANAGED_BY" \
+    "buzz.block.xyz/binding-version=$BINDING_VERSION"
+
+cat <<YAML | kubectl --context "$CONTEXT" --namespace "$NAMESPACE" apply -f -
+apiVersion: v1
+kind: Pod
+metadata:
+  name: digest-resolution-probe
+  labels:
+    app.kubernetes.io/managed-by: $MANAGED_BY
+    buzz.block.xyz/binding-version: $BINDING_VERSION
+spec:
+  restartPolicy: Never
+  containers:
+    - name: probe
+      image: $IMAGE
+      imagePullPolicy: $PULL_POLICY
+      command: [/bin/bash, -ceu]
+      args:
+        - 'test "$(readlink /usr/local/bin/buzz-acp)" = sprig; echo DIGEST_ABI_OK'
+YAML
+
+if ! kubectl --context "$CONTEXT" --namespace "$NAMESPACE" wait \
+    --for=jsonpath='{.status.phase}'=Succeeded pod/digest-resolution-probe --timeout=120s; then
+    kubectl --context "$CONTEXT" --namespace "$NAMESPACE" describe pod digest-resolution-probe >&2 || true
+    exit 1
+fi
+
+kubectl --context "$CONTEXT" --namespace "$NAMESPACE" logs digest-resolution-probe
+IMAGE_ID="$(kubectl --context "$CONTEXT" --namespace "$NAMESPACE" get pod digest-resolution-probe \
+    -o jsonpath='{.status.containerStatuses[0].imageID}')"
+RESOLVED_SPEC="$(kubectl --context "$CONTEXT" --namespace "$NAMESPACE" get pod digest-resolution-probe \
+    -o jsonpath='{.spec.containers[0].image}')"
+[[ "$RESOLVED_SPEC" == "$IMAGE" ]]
+[[ -n "$IMAGE_ID" ]]
+printf 'resolved_spec=%s\nimage_id=%s\nPASS: exact digest-qualified Sprig reference started\n' \
+    "$RESOLVED_SPEC" "$IMAGE_ID"