#!@ENV_ABSOLUTE_PATH@ bash
set -eufo pipefail

command -v kubectl >/dev/null 2>&1 || { echo 'Please install kubectl'; exit 1; }

USAGE="Usage: $(basename "$0") <node-name> [-r|--reboot]"
[ $# -eq 0 ] && { echo "$USAGE"; exit 1; }
NODE_REBOOT=0
NODE_NAME=${1:-}; shift

if [[ $# -gt 0 ]]; then
        if [[ "$1" =~ ^-r|--reboot$ ]]; then
                NODE_REBOOT=1; shift
        else
                echo "$USAGE"; exit 1
        fi
fi

kubectl apply -f - <<-EOF > /dev/null
---
apiVersion: v1
kind: Pod
metadata:
  name: krash-${RANDOM}
spec:
  containers:
    - name: krash
      image: alpine:latest
      securityContext:
        privileged: true
      command:
        - /bin/sh
        - -c
        - |
          sysctl -w kernel.panic=${NODE_REBOOT}
          echo 'c' > /proc/sysrq-trigger
  priorityClassName: system-node-critical
  nodeName: ${NODE_NAME}
EOF