Add shared dev environment for medik8s operators

.github/workflows/shellcheck.yml

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+name: shellcheck
+
+on:
+  push:
+    branches: [main]
+    paths: ["dev/**/*.sh"]
+  pull_request:
+    paths: ["dev/**/*.sh"]
+
+jobs:
+  shellcheck:
+    runs-on: ubuntu-24.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Run shellcheck
+        uses: ludeeus/action-shellcheck@2.0.0
+        with:
+          scandir: dev
+          severity: warning

README.md

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 # tools
 Tools etc. which are not specific for one of the medik8s operators
+
+## Dev Environment
+
+Shared development environment for all medik8s operators. See [dev/README.md](dev/README.md) for full documentation.
+
+### Quick Start
+
+```bash
+# 1. Add to your operator's Makefile (one-time):
+#    TOOLS_DIR ?= $(shell cd .. && pwd)/tools
+#    -include $(TOOLS_DIR)/dev/dev.mk
+
+# 2. Create the dev cluster:
+make dev-setup
+
+# 3. Build and deploy your operator:
+make dev-deploy
+
+# 4. Simulate failures:
+make dev-simulate-failure
+```
+
+## Other Tools
+
+- `findIndexImage/` — Find OCP index images for IIB discovery
+- `scripts/` — Build and deploy scripts for NHC+SNR

dev/README.md

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+# Medik8s Development Environment
+
+A shared, consistent development environment for all medik8s operators.
+
+## Quick Start
+
+```bash
+# One-time: add the dev environment snippet to your operator's Makefile
+# (see Setup section below for options)
+
+make dev-setup          # Create Kind cluster
+make dev-deploy         # Build and deploy operator
+make dev-describe       # Verify everything is running
+make dev-simulate-failure && kubectl get nodes -w  # Test remediation
+make dev-recover        # Restore cluster
+make dev-teardown       # Clean up
+```
+
+### Full Walkthrough (NHC + SNR)
+
+This walks through the complete remediation flow: deploy both operators,
+simulate a node failure, and watch NHC trigger SNR to remediate it.
+
+```bash
+# 1. Deploy SNR (creates Kind cluster on first run)
+pushd self-node-remediation
+make dev-setup
+make dev-deploy
+popd
+
+# 2. Deploy NHC (auto-creates NodeHealthCheck CR linking to SNR)
+pushd node-healthcheck-operator
+make dev-deploy
+popd
+
+# 3. Verify everything is running
+make dev-wait
+make dev-describe
+
+# 4. Simulate a node failure
+make dev-simulate-failure
+
+# 5. Watch the remediation flow (run in separate terminals)
+kubectl get nodes -w
+kubectl get selfnoderemediation -A -w
+make dev-events
+
+# 6. Debug if needed
+make dev-logs                          # tail operator logs
+make dev-describe                      # full resource summary
+make dev-summary                       # remediation flow timeline
+make dev-shell                         # shell into a worker node
+
+# 7. Recover all workers
+make dev-recover
+
+# 8. Teardown
+make dev-teardown
+```
+
+## Prerequisites
+
+- [Go](https://go.dev/doc/install) (version matching the operator's go.mod)
+- [Kind](https://kind.sigs.k8s.io/docs/user/quick-start/#installation) (v0.22.0+, for K8s 1.29+ compatibility)
+- [kubectl](https://kubernetes.io/docs/tasks/tools/) or [oc](https://mirror.openshift.com/pub/openshift-v4/clients/ocp/latest/)
+- [Docker](https://docs.docker.com/get-docker/) or [Podman](https://podman.io/getting-started/installation)
+- [operator-sdk](https://sdk.operatorframework.io/docs/installation/) (optional, for OLM bundle testing)
+
+### System limits
+
+The setup script checks inotify limits and exits with an error if they are too low (auto-fixes when running as root). Fix manually before running `make dev-setup`:
+
+```bash
+sudo sysctl -w fs.inotify.max_user_instances=8192
+sudo sysctl -w fs.inotify.max_user_watches=524288
+```
+
+To make persistent, add to `/etc/sysctl.d/99-kind.conf`:
+```
+fs.inotify.max_user_instances=8192
+fs.inotify.max_user_watches=524288
+```
+
+### Podman rootless setup
+
+Rootless podman requires `cpuset` cgroup delegation for Kind worker nodes. Without it, kubelet cannot start inside the containers. The setup script detects this and prints instructions.
+
+```bash
+sudo mkdir -p /etc/systemd/system/user@.service.d
+sudo tee /etc/systemd/system/user@.service.d/delegate.conf <<EOF
+[Service]
+Delegate=cpu cpuset io memory pids
+EOF
+sudo systemctl daemon-reload
+```
+
+**You must log out and log back in** for the changes to take effect. After that, all commands work without `sudo`.
+
+## Setup
+
+Add the following snippet at the end of your operator's Makefile:
+
+```makefile
+# Shared dev environment
+# Uses a local sibling checkout if available (e.g. ../tools),
+# otherwise downloads the tools repo into .tools/ on first dev-* target use.
+#
+# IMPORTANT: Do NOT use $(shell git clone ...) here — $(shell) executes at
+# Makefile parse time, so any make invocation (make build, make test, make help)
+# would trigger a git clone. The dev-% fallback rule below is lazy: the clone
+# only runs when a dev-* target is actually invoked.
+TOOLS_DIR ?= $(shell cd .. && pwd)/tools
+DEV_MK := $(TOOLS_DIR)/dev/dev.mk
+ifeq ($(wildcard $(DEV_MK)),)
+  TOOLS_DIR := $(shell pwd)/.tools
+  DEV_MK := $(TOOLS_DIR)/dev/dev.mk
+endif
+-include $(DEV_MK)
+ifeq ($(wildcard $(DEV_MK)),)
+dev-%:
+	@echo "Downloading medik8s/tools into $(TOOLS_DIR)..."
+	@if [ -d $(TOOLS_DIR) ]; then echo "  Removing stale $(TOOLS_DIR)..."; rm -rf $(TOOLS_DIR); fi
+	@git clone --depth 1 https://github.com/medik8s/tools.git $(TOOLS_DIR)
+	@test -f $(DEV_MK) || { echo "Error: $(DEV_MK) not found after clone."; exit 1; }
+	@$(MAKE) $@
+endif
+```
+
+Add `.tools/` to your `.gitignore`:
+```
+echo '.tools/' >> .gitignore
+```
+
+To update the downloaded copy, delete it and re-run:
+```bash
+rm -rf .tools && make dev-help
+```
+
+All `dev-*` targets are now available.
+
+## What It Creates
+
+- **1 control-plane + 3 worker nodes** (SNR needs 2+ workers for peer health; use `KIND_HA=true` for 3 CP + 3 workers)
+- **Worker labels** (`node-role.kubernetes.io/worker`)
+- **softdog** kernel module on workers (for SNR/SBR watchdog testing)
+- **Namespaces**: `medik8s-system` (privileged PSA) and `medik8s-leases` for shared resources
+- **cert-manager** (required for operator webhook TLS certificates)
+- **inotify limits** increased automatically when running as root
+- **OLM** (if operator-sdk is available; uses `operator-sdk olm install` which installs OLM v0 — OLM v1 requires separate setup)
+
+Re-running `make dev-setup` on an existing cluster is safe — it re-applies configuration without recreating.
+
+**Note:** Each operator deploys into its own namespace (e.g. `self-node-remediation`, `node-healthcheck-operator-system`) as defined in its kustomization files (either `config/default/kustomization.yaml` or a component/patch kustomization). The `dev-deploy` target automatically creates cert-manager certificates, patches the deployment to mount webhook TLS secrets, and waits for the deployment to become ready. If NHC and a remediator (SNR, FAR, or MDR) are both deployed, it also creates a NodeHealthCheck CR linking them.
+
+## Failure Simulations
+
+| Command | What it does |
+|---------|-------------|
+| `make dev-simulate-failure` | Stop kubelet on a worker → node goes NotReady → NHC creates remediation CR |
+| `make dev-simulate-network` | Block API server from a worker → tests SNR peer health decisions |
+| `make dev-simulate-storm` | Stop kubelet on 2/3 workers → NHC detects storm, pauses remediation |
+| `make dev-recover` | Restart kubelet, restore network, clean up CRs |
+
+## All Targets
+
+| Target | Description |
+|--------|-------------|
+| `dev-setup` | Create Kind cluster with all dependencies (`SKIP_KIND=true` for external cluster, `KIND_HA=true` for 3 CP + 3 workers) |
+| `dev-teardown` | Destroy Kind cluster |
+| `dev-build` | Build operator image and load into Kind (or push to ttl.sh) |
+| `dev-deploy` | Build + install CRDs + deploy + configure cert-manager |
+| `dev-redeploy` | Rebuild and restart (deletes pods to pick up new image) |
+| `dev-undeploy` | Remove operator from cluster |
+| `dev-bundle-run` | Deploy operator via OLM bundle (requires operator-sdk) |
+| `dev-bundle-cleanup` | Remove OLM bundle deployment |
+| `dev-create-nhc` | Create NodeHealthCheck CR (auto-detects SNR/FAR/MDR remediator) |
+| `dev-logs` | Tail operator controller-manager logs |
+| `dev-describe` | Full summary (nodes, pods, CRs, leases, events) |
+| `dev-summary` | Remediation flow timeline |
+| `dev-events` | Show recent remediation-related events |
+| `dev-wait` | Wait for all operator pods to be ready |
+| `dev-shell` | Open a shell on a Kind node (`NODE=<name>`, default: first worker) |
+| `dev-simulate-failure` | Stop kubelet on a worker |
+| `dev-simulate-storm` | Stop kubelet on 2 workers |
+| `dev-simulate-network` | Block API server from a worker |
+| `dev-recover` | Recover all workers and clean up |
+| `dev-help` | Show all dev targets |
+
+## Using an Existing Cluster (OCP, etc.)
+
+For external clusters (OCP, etc.), set `SKIP_KIND=true` to skip Kind
+creation. Images are pushed to [ttl.sh](https://ttl.sh) — an anonymous,
+ephemeral registry that requires no auth.
+
+```bash
+# Point kubectl at your cluster, then use the same workflow
+export KUBECONFIG=~/.kube/my-ocp-cluster
+export SKIP_KIND=true
+
+make dev-setup     # Configures namespaces + cert-manager (no Kind)
+make dev-deploy    # Builds image, pushes to ttl.sh, deploys
+make dev-describe  # Verify everything is running
+```
+
+Exporting `SKIP_KIND=true` ensures all targets know this is an external cluster.
+Without it, auto-detection might find a local Kind cluster and use the wrong
+image delivery method.
+
+You can also use ttl.sh with a Kind cluster:
+
+```bash
+DEV_REGISTRY=ttl.sh make dev-deploy
+```
+
+**Note:** Failure simulations (`dev-simulate-failure`, etc.) require
+`docker exec`/`podman exec` access to Kind node containers. On external
+clusters, trigger failures through your cluster's own mechanisms.
+
+## Configuration
+
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `KIND_HA` | `false` | Set to `true` for HA cluster (3 CP + 3 workers, for SNR CP testing) |
+| `SKIP_KIND` | `false` | Set to `true` to skip Kind creation (external cluster) |
+| `DEV_REGISTRY` | `local` (Kind) / `ttl.sh` (external) | Image delivery: `local` or `ttl.sh` |
+| `DEV_IMG` | auto-generated | Override to use a custom image name |
+| `TTL_SH_TTL` | `2h` | Image expiry when using ttl.sh |
+| `MEDIK8S_CLUSTER_NAME` | `medik8s-dev` | Kind cluster name |
+| `CONTAINER_TOOL` | auto-detected | `docker` or `podman` |
+| `KUBECTL` | auto-detected | `kubectl` or `oc` |
+| `NHC_UNHEALTHY_DURATION` | `300s` | Unhealthy condition duration for NHC CR |
+
+## Operator Coverage
+
+| Operator | Coverage | Notes |
+|----------|----------|-------|
+| NHC | Full | Node conditions, storm recovery, escalation, CP protection |
+| NMO | Full | Cordon, drain, PDB-aware eviction. Pod restarts on startup (missing namespace `list` RBAC — NMO bug, stabilizes after ~4 restarts). |
+| SNR | ~85% | Peer health, softdog watchdog, API check. No hardware watchdog. |
+| FAR | Controller logic | No real fence agents — controller reconciliation is testable |
+| MDR | Controller logic | No Machine API — reconciliation testable via envtest (`make test`) |
+| SBR | Unit only | No shared storage. Leader election RBAC error on startup (SBR bug). |
+
+## Limitations
+
+- **FAR fence agent execution** — no IPMI/BMC or cloud APIs
+- **MDR Machine API** — Kind has no Machine objects
+- **SBR shared storage** — no ODF
+- **Hardware watchdog** — only softdog (software)
+- **SNR `${IMG}` placeholders** — SNR manifests use `${IMG}` placeholders expanded by `envsubst`. The `dev-deploy` target handles this automatically, but running `kustomize build config/default | kubectl apply -f -` directly will produce `InvalidImageName` errors. The SNR controller reconciles DaemonSets from templates baked into the image, so image patches don't persist — always use `make dev-deploy` or `make dev-redeploy` for SNR.
+
+For full-fidelity testing of these scenarios, use an OpenShift cluster with real hardware (BMC/IPMI for FAR, Machine API for MDR, ODF for SBR, hardware watchdog for SNR). The `SKIP_KIND=true` workflow supports deploying to external clusters.

dev/common.sh

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+#!/bin/bash
+# Shared helpers for medik8s dev scripts.
+# Source this from other scripts: source "$(dirname "${BASH_SOURCE[0]}")/common.sh"
+
+# Detect kubectl or oc
+detect_kubectl() {
+    if command -v kubectl &>/dev/null; then
+        echo kubectl
+    elif command -v oc &>/dev/null; then
+        echo oc
+    else
+        echo "Error: kubectl or oc is required but neither is installed." >&2
+        echo "Install kubectl from: https://kubernetes.io/docs/tasks/tools/" >&2
+        exit 1
+    fi
+}
+
+# Detect container tool (docker preferred, podman fallback)
+detect_container_tool() {
+    if command -v docker &>/dev/null; then
+        echo docker
+    elif command -v podman &>/dev/null; then
+        echo podman
+    else
+        echo "Error: docker or podman is required but neither is installed." >&2
+        exit 1
+    fi
+}
+
+KUBECTL="${KUBECTL:-$(detect_kubectl)}"
+CONTAINER_TOOL="${CONTAINER_TOOL:-$(detect_container_tool)}"