add "ssh" tool

docs/deploy-development-rp.md

@@ -233,6 +233,12 @@
 
 ## Debugging
 
+* SSH to the bootstrap node:
+
+  ```
+  hack/ssh-bootstrap.sh "/subscriptions/$AZURE_SUBSCRIPTION_ID/resourceGroups/$RESOURCEGROUP/providers/Microsoft.RedHatOpenShift/openShiftClusters/$CLUSTER"
+  ```
+
 * Get an admin kubeconfig:
 
   ```
@@ -241,8 +247,8 @@
   oc version
   ```
 
-* SSH to the bootstrap node:
+* "SSH" to a cluster node:
 
   ```
-  hack/ssh-bootstrap.sh "/subscriptions/$AZURE_SUBSCRIPTION_ID/resourceGroups/$RESOURCEGROUP/providers/Microsoft.RedHatOpenShift/openShiftClusters/$CLUSTER"
+  hack/ssh.sh [aro-master-0]
   ```

hack/ssh.sh

@@ -0,0 +1,54 @@
+#!/bin/bash -e
+
+if [[ ! -e admin.kubeconfig ]]; then
+    echo "run hack/get-admin-kubeconfig.sh first" >&2
+    exit 1
+fi
+
+export KUBECONFIG=admin.kubeconfig
+
+NODENAME=aro-master-0
+[[ "$#" -gt 0 ]] && NODENAME=$1
+
+cleanup() {
+    [[ -n "$POD" ]] && oc delete pod -n default "$POD" >/dev/null
+}
+
+trap cleanup EXIT
+
+POD=$(oc create -o json -f - <<EOF | jq -r .metadata.name
+kind: Pod
+apiVersion: v1
+metadata:
+  generateName: debug
+  namespace: default
+spec:
+  containers:
+  - command:
+    - /sbin/chroot
+    - /host
+    - /bin/bash
+    - -c
+    - "cd && exec bash --login"
+    image: ubi8/ubi-minimal
+    name: debug
+    stdin: true
+    tty: true
+    volumeMounts:
+    - mountPath: /host
+      name: host
+  hostIPC: true
+  hostNetwork: true
+  hostPID: true
+  nodeName: $NODENAME
+  restartPolicy: Never
+  terminationGracePeriodSeconds: 0
+  volumes:
+  - hostPath:
+      path: /
+    name: host
+EOF
+)
+
+oc wait --for=condition=Ready "pod/$POD" >/dev/null
+oc attach -it -n default -c debug "pod/$POD"