run-pod.sh

#!/usr/bin/env bash

while getopts i:n: OPT
do
    case "$OPT" in
        "n") NAMESPACE="$OPTARG";
           ;;
        "i") IMAGE="$OPTARG";
           ;;
    esac
done
shift $(($OPTIND - 1))

PREFIX="$1"
COMMAND="$2"
POD=$(kubectl -n $NAMESPACE get pod | grep "$PREFIX" | tail -1 | awk '{print $1}')
JSON=$(kubectl -n $NAMESPACE get pod $POD -ojson | jq '.spec.containers[0]')

if [ -z "$COMMAND" ];then
    COMMAND="/bin/sh"
fi

NAME=${PREFIX}-run-$(date +%Y%m%d%H%M%S)
if [ -z "$IMAGE" ];then
    IMAGE=$(echo $JSON | jq -r '.image')
fi
ENV_FROM=$(echo $JSON | jq -r '.envFrom')

OVERRIDES=$(cat <<EOF | tr -d "\n"
{
  "spec": {
    "containers": [
      {
        "name": "${NAME}",
        "image": "${IMAGE}",
        "envFrom": ${ENV_FROM},
        "command": ["sh", "-c", "${COMMAND}"],
        "tty": true,
        "stdin": true
      }
    ]
  }
}
EOF
)

echo $IMAGE
kubectl -n ${NAMESPACE} run --tty -i --rm --restart=Never ${NAME} --image ${IMAGE} --overrides="$OVERRIDES" --command -- "$COMMAND"