longhorn: apply settings via api job

infrastructure/longhorn/core/longhorn-settings-ensure-job.yaml

@@ -2,7 +2,7 @@
 apiVersion: batch/v1
 kind: Job
 metadata:
-  name: longhorn-settings-ensure-1
+  name: longhorn-settings-ensure-2
   namespace: longhorn-system
 spec:
   backoffLimit: 0
@@ -28,7 +28,7 @@ spec:
                     operator: Exists
       containers:
         - name: apply
-          image: bitnami/kubectl@sha256:554ab88b1858e8424c55de37ad417b16f2a0e65d1607aa0f3fe3ce9b9f10b131
+          image: docker.io/alpine:3.20
           command: ["/scripts/longhorn_settings_ensure.sh"]
           volumeMounts:
             - name: longhorn-settings-ensure-script

infrastructure/longhorn/core/scripts/longhorn_settings_ensure.sh

@@ -1,18 +1,35 @@
-#!/usr/bin/env bash
-set -euo pipefail
+#!/usr/bin/env sh
+set -eu
 
-namespace="longhorn-system"
+# Longhorn blocks direct CR patches for some settings; use the internal API instead.
+apk add --no-cache curl >/dev/null
 
-patch_setting() {
-  local name="$1"
-  local value="$2"
+api_base="http://longhorn-backend.longhorn-system.svc:9500/v1/settings"
 
-  kubectl -n "${namespace}" patch setting.longhorn.io "${name}" \
-    --type=merge \
-    -p "{\"value\":\"${value}\"}" >/dev/null
+wait_for_api() {
+  attempts=30
+  while [ "${attempts}" -gt 0 ]; do
+    if curl -fsS "${api_base}" >/dev/null 2>&1; then
+      return 0
+    fi
+    attempts=$((attempts - 1))
+    sleep 2
+  done
+  echo "Longhorn API not ready after retries." >&2
+  return 1
 }
 
-patch_setting default-engine-image "registry.bstein.dev/infra/longhorn-engine:v1.8.2"
-patch_setting default-instance-manager-image "registry.bstein.dev/infra/longhorn-instance-manager:v1.8.2"
-patch_setting default-backing-image-manager-image "registry.bstein.dev/infra/longhorn-backing-image-manager:v1.8.2"
-patch_setting support-bundle-manager-image "registry.bstein.dev/infra/longhorn-support-bundle-kit:v0.0.56"
+update_setting() {
+  name="$1"
+  value="$2"
+  curl -fsS -X PUT \
+    -H "Content-Type: application/json" \
+    -d "{\"value\":\"${value}\"}" \
+    "${api_base}/${name}" >/dev/null
+}
+
+wait_for_api
+update_setting default-engine-image "registry.bstein.dev/infra/longhorn-engine:v1.8.2"
+update_setting default-instance-manager-image "registry.bstein.dev/infra/longhorn-instance-manager:v1.8.2"
+update_setting default-backing-image-manager-image "registry.bstein.dev/infra/longhorn-backing-image-manager:v1.8.2"
+update_setting support-bundle-manager-image "registry.bstein.dev/infra/longhorn-support-bundle-kit:v0.0.56"