Manage and maintain multiple kubectl versions

setkube

#!/bin/bash

BIN_PATH="$HOME/.local/bin"


help_msg () {
  echo "Usage: setkube -v [kubectl_version_number | stable]"
  echo "       setkube -d [kubectl_version_number]"
  echo ""
  echo "       kubectl_version_number = 1.23.5, 1.22.2, etc."
  echo ""
  echo "       -v: set kubectl version"
  echo "       -d: delete kubectl version"
}

set_kubectl () {
  REQ_VER="v$1"

  [ ! -d "$BIN_PATH" ] && mkdir -p "$BIN_PATH"

  if [ "$REQ_VER" = "vstable" ]; then
    KUBE_VER=$(curl -L -s https://dl.k8s.io/release/stable.txt)
  else
    KUBE_VER=$REQ_VER
  fi

  KUBECTL="$BIN_PATH/kubectl-$KUBE_VER"

  if [ ! -f "$KUBECTL" ]; then
    echo "Downloading kubectl $KUBE_VER ..."
    curl -Ls "https://dl.k8s.io/release/$KUBE_VER/bin/linux/amd64/kubectl" -o "$KUBECTL"
    CHKSUM=$(curl -Ls "https://dl.k8s.io/$KUBE_VER/bin/linux/amd64/kubectl.sha256")
    echo "$CHKSUM $KUBECTL" | sha256sum --check &> /dev/null
    if [ "$?" != "0" ]; then
      echo "The specified version does not exist."
      rm $KUBECTL
    fi
  fi

  echo "kubectl $KUBE_VER is ready!"
  ln -f -s $KUBECTL $BIN_PATH/kubectl
  chmod +x $KUBECTL
}

del_kubectl () {
    DEL_VER="$BIN_PATH/kubectl-v$1"
    if [ -f "$DEL_VER" ]; then
      echo "Deleting kubectl-v$1 ..."
      rm -i $DEL_VER
    else
      echo "The specified version ($1) does not exist."
    fi
}

while getopts ":hd:v:" option; do
  case $option in
    h) # display Help
      help_msg
      exit;;
    d) # delete version
      del_kubectl $OPTARG
      ;;
    :)
      echo "Error: -${OPTARG} requires an argument."
      ;;
    v)
      set_kubectl $OPTARG
      ;;
    \?) # Invalid option
      echo "Error: Invalid option"
      exit;;
  esac
done