write-config

#!/bin/bash

set -e -u -o pipefail

. /usr/lib/nagios-plugins-openshift/utils

usage() {
  echo "Usage: $0 -f <path> -s <server>:<port> -t <token>"
  echo
  echo 'Write a client configuration file for OpenShift monitoring.'
  echo
  echo 'Options:'
  echo ' -f   Config file path'
  echo ' -s   Address and port of the OpenShift API server'
  echo ' -t   Bearer token for authentication'
  echo ' -C   Check whether configuration differs from file given as'\
    'destination; exit status 0 indicates no changes; any other status'\
    'indicates either a non-existing destination file or trouble'
}

opt_cfgfile=
opt_server=
opt_token=
opt_check=

while getopts 'hf:s:t:C' opt; do
  case "$opt" in
    h)
      usage
      exit 0
      ;;
    f) opt_cfgfile="$OPTARG" ;;
    s) opt_server="$OPTARG" ;;
    t) opt_token="$OPTARG" ;;
    C) opt_check=yes ;;
    *)
      usage >&2
      exit 1
      ;;
  esac
done

shift $((OPTIND - 1))

if [[ "$#" -gt 0 ]]; then
  usage >&2
  exit 1
fi

if [[ -z "$opt_cfgfile" ]]; then
  usage >&2
  exit 1
fi

if [[ -z "$opt_server" || "$opt_server" != *:* ]]; then
  usage >&2
  exit 1
fi

if [[ -z "$opt_token" || "${#opt_token}" -lt 10 ]]; then
  usage >&2
  exit 1
fi

tmpfile=$(mktemp)
trap 'rm -f "$tmpfile"' EXIT

make_nickname() {
  # Convert to lowercase
  local lc=${1,,*}

  # Strip unwanted characters
  echo "${lc//[^0-9a-zA-Z]/}"
}

user_nickname=cred-$(make_nickname "$opt_server")
cluster_nickname=cluster-$(make_nickname "$opt_server")
context_nickname="ctx-$cluster_nickname-$user_nickname"

run_oc "$tmpfile" config set-credentials \
  "$user_nickname" \
  --token="$opt_token" \
  --username= \
  --password=

run_oc "$tmpfile" config set-cluster \
  "$cluster_nickname" \
  --server="$opt_server" \
  --insecure-skip-tls-verify=false

run_oc "$tmpfile" config set-context \
  "$context_nickname" \
  --cluster="$cluster_nickname" \
  --user="$user_nickname" \
  --namespace=

run_oc "$tmpfile" config use-context \
  "$context_nickname"

if [[ -n "$opt_check" ]]; then
  /usr/bin/cmp --silent "$tmpfile" "$opt_cfgfile"
else
  cp "$tmpfile" "$opt_cfgfile"
fi

exit 0

# vim: set sw=2 sts=2 et :