Helm CLI wrapper making it easier to work with multiple clusters when using TLS-enabled Tiller

helm_tls_wrapper.sh

#!/usr/bin/env bash
#
# this script is a helpful wrapper for Helm CLI, when using TLS enabled Tiller
# See https://github.com/helm/helm/blob/master/docs/tiller_ssl.md
#
# Copyright (C) 2019 Anastas Dancha (aka @anapsix)
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#
#
# save this somewhere in your PATH (e.g. /usr/local/bin/)
# as helm_tls_wrapper.sh
# and add shell alias (so that shell-completion works without any additional changes)
# alias helm=helm_tls_wrapper.sh
#
# save your TLS certificates in ${HELM_HOME}/tls/${K8S_CONTEXT}/
# as ca.pem, cert.pem, and key.pem

: ${HELM_HOME:=~/.helm}
: ${KUBECONFIG:=${HOME}/.kube/config}
: ${HELM_VERSION:="unset"}


if [[ "${HELM_VERSION}" == "unset" ]]; then
  HELM_BIN="helm"
else
  echo >&2 "HELM Version: ${HELM_VERSION}"
  HELM_BIN="helm_${HELM_VERSION}"
fi



[[ "$(uname)" == "Darwin" ]] && grep="ggrep" || grep="grep"

K8S_CONTEXT_ARG="$(echo "$@" | $grep -Po '(?<=--kube-context=)\S+')"

if [[ -z "${K8S_CONTEXT_ARG}" ]]; then
  K8S_CONTEXT="$($grep -Po '(?<=^current-context: ).*$' ${KUBECONFIG})"
else
  K8S_CONTEXT="${K8S_CONTEXT_ARG}"
fi
echo >&2 "K8S_CONTEXT: ${K8S_CONTEXT}"

for arg in $@; do
  if [[ "$arg" == "--tls" ]]; then
    export HELM_TLS_CA_CERT="${HELM_HOME}/tls/${K8S_CONTEXT}/ca.pem"
    export HELM_TLS_CERT="${HELM_HOME}/tls/${K8S_CONTEXT}/cert.pem"
    export HELM_TLS_KEY="${HELM_HOME}/tls/${K8S_CONTEXT}/key.pem"
    export HELM_TLS_ENABLE="true"
    # export HELM_TLS_VERIFY="true"

    if [[ "$DEBUG" == "1" ]]; then
      echo export HELM_TLS_CA_CERT=\"${HELM_HOME}/tls/${K8S_CONTEXT}/ca.pem\"
      echo export HELM_TLS_CERT=\"${HELM_HOME}/tls/${K8S_CONTEXT}/cert.pem\"
      echo export HELM_TLS_KEY=\"${HELM_HOME}/tls/${K8S_CONTEXT}/key.pem\"
      echo export HELM_TLS_ENABLE=\"true\"
    fi
    break
  fi
done

[[ "$DEBUG" == "1" ]] && echo ${HELM_BIN} $@ || ${HELM_BIN} $@