Generate CoreOS configdrive ISO based on cloud-config file

If you are running CoreOS in a virtual environment, you can automatically configure CoreOS by cloud-config. This can be achieved by creating a configdrive ISO and mount it at boottime. CoreOS will scan the CD-ROM and will execute the cloud-config.

Script to generate the ISO based on the cloud-config

This script will generate an configdrive ISO based on the given cloud-config.

Supports the following OS

1. Mac OS
2. Linux

Usage

$ createIso.sh --cloud-config cloud-config.yml --name application

createiso.sh

#!/usr/bin/env bash

PATH_TEMP=/tmp/new-drive
PATH_ISO_MAC=`which hdiutil`
PATH_ISO_LINUX=`which mkisofs`

ISO_COMMAND="none"

if [[  -f "${PATH_ISO_MAC}" ]]; then
    echo "MacOS Detected, using hdiutil tool"
    ISO_COMMAND="mac"
fi

if [[  -f "${PATH_ISO_LINUX}" ]]; then
    echo "Linux Detected, using mkisofs tool"
    ISO_COMMAND="linux"
fi

if [[ "${ISO_COMMAND}" == "none" ]]; then
    echo "Cannot find hdiutil for mac or mkisofs for linux."
    echo "Please install required tools"
    exit;
fi

while [[ $# > 1 ]]
do
    key="$1"
    case $key in
        --name)
        NAME="$2"
        shift # past argument
        ;;
        --cloud-config)
        CLOUD_CONFIG="$2"
        shift # past argument
        ;;
        *)
            # unknown option
        ;;
    esac
    shift # past argument or value
done

if [ -z "${CLOUD_CONFIG}" ]; then
    echo "usage: createIso.sh --cloud-config cloud-config.yml --name application";
    exit
fi
if [ -z "${NAME}" ]; then
    echo "usage: createIso.sh --cloud-config cloud-config.yml --name application";
    exit;
fi

if [[ ! -f "${CLOUD_CONFIG}" ]]; then
    echo "Cloud config file not found (${CLOUD_CONFIG})"
    exit;
fi

echo "Creating config drive with cloud-config '${CLOUD_CONFIG}'"
mkdir -p ${PATH_TEMP}/openstack/latest
cp ${CLOUD_CONFIG} ${PATH_TEMP}/openstack/latest/user_data

if [[ "${ISO_COMMAND}" == "linux" ]]; then
    mkisofs -R -V config-2 -o configdrive-${NAME}.iso ${PATH_TEMP}
fi

if [[ "${ISO_COMMAND}" == "mac" ]]; then
    hdiutil makehybrid -iso -joliet -default-volume-name config-2 -o configdrive-${NAME}.iso ${PATH_TEMP}
fi

#Cleanup
rm -r ${PATH_TEMP}