kubectl run with PVCs

kubectl-run-with-pvc.sh

#!/bin/bash

# Modified from https://gist.github.com/yuanying/3aa7d59dcce65470804ab43def646ab6.

IMAGE="ubuntu:20.04"
COMMAND="/bin/bash"
SUFFIX=$(date +%s | shasum | base64 | fold -w 10 | head -1 | tr '[:upper:]' '[:lower:]')

usage_exit() {
    echo "Usage: $0 [-n namespace] [-c command] [-i image] PVC ..." 1>&2
    exit 1
}

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

VOLUME_MOUNTS=""
VOLUMES=""
COMMA=""

for i in $@
do
    VOLUME_MOUNTS="${VOLUME_MOUNTS}${COMMA}{\"name\": \"${i}\",\"mountPath\": \"/pvcs/${i}\"}"
    VOLUMES="${VOLUMES}${COMMA}{\"name\": \"${i}\",\"persistentVolumeClaim\": {\"claimName\": \"${i}\"}}"
    COMMA=","
done

kubectl --namespace="${NAMESPACE}" run -it --rm --restart=Never --image=${IMAGE} pvc-mounter-${SUFFIX} --overrides "
{
  \"spec\": {
    \"hostNetwork\": true,
    \"containers\":[
      {
        \"args\": [\"${COMMAND}\"],
        \"stdin\": true,
        \"tty\": true,
        \"name\": \"pvc\",
        \"image\": \"${IMAGE}\",
        \"volumeMounts\": [
          ${VOLUME_MOUNTS}
        ]
      }
    ],
    \"volumes\": [
      ${VOLUMES}
    ],
    \"tolerations\": [
      {
        \"effect\": \"NoSchedule\",
        \"operator\": \"Exists\"
      }
    ]
  }
}
" -- ${COMMAND}