Retrieve IP from VM

#!/usr/bin/env bash

set -u

# Docker Healthcheck

# Retrieve guest info for Docker healthcheck

RESPONSE=$(curl -s -m 5 -S http://127.0.0.1:2210/read?command=10 2>&1)

: ${DHCP:='N'}

if [[ ! "${RESPONSE}" =~ "\"success\"" ]] ; then

  echo "Failed to connect to guest: $RESPONSE"

  exit 1

fi

# Retrieve the HTTP port number

if [[ ! "${RESPONSE}" =~ "\"http_port\"" ]] ; then

  echo "Failed to parse response from guest: $RESPONSE"

  exit 1

fi

rest=${RESPONSE#*http_port}

rest=${rest#*:}

rest=${rest%%,*}

PORT=${rest%%\"*}

# Retrieve the IP address

if [[ "${DHCP}" == [Yy1]* ]]; then

  PORT=5555

  IP="127.0.0.1"

else

  PORT=5000

  IP="20.20.20.21"

if [[ ! "${RESPONSE}" =~ "eth0" ]] ; then

  echo "Failed to parse response from guest: $RESPONSE"

  exit 1

fi

rest=${RESPONSE#*eth0}

rest=${rest#*ip}

rest=${rest#*:}

rest=${rest#*\"}

IP=${rest%%\"*}

if ! curl -m 3 -ILfSs "http://${IP}:${PORT}/" > /dev/null; then

  echo "Failed to reach ${IP}:${PORT}"

  exit 1