build.sh

#!/bin/bash

if [[ -t 0 ]]; then
    INTERACTIVE=1
else
    INTERACTIVE=0
fi

function error() {
    if [ "$INTERACTIVE" -eq 1 ]; then
        echo -e "\e[91m${1}\e[0m" >&2
    else
        echo $1 >&2
    fi
}

function usage() {
    echo "" >&2
    echo "Usage: PACKER_PUBLIC_KEY=~/.ssh/id_rsa.pub PACKER_PRIVATE_KEY=~/.ssh/id_rsa build.sh IMAGE" >&2
    echo "" >&2
    echo "  IMAGE: the name of the subdirectory to build" >&2
    echo "" >&2
    echo "Required software:" >&2
    echo " - packer" >&2
    echo " - cloud image utils" >&2
    echo "" >&2
}

image=$1

if [ -z "$image" ]; then
    error "Error: missing image name argument."
    usage
    exit 1
fi

if [ -z "$PACKER_PUBLIC_KEY" ]; then
    error "Error: missing PACKER_PUBLIC_KEY environment variable."
    usage
    exit 1
fi

if [ -z "$PACKER_PRIVATE_KEY" ]; then
    error "Error: missing PACKER_PRIVATE_KEY environment variable."
    usage
    exit 1
fi

if [ ! -f "$PACKER_PUBLIC_KEY" ]; then
    error "Error: packer public key not readable: $PACKER_PUBLIC_KEY"
    usage
    exit 1
fi

if [ ! -f "$PACKER_PRIVATE_KEY" ]; then
    error "Error: packer private key not readable: $PACKER_PRIVATE_KEY"
    usage
    exit 1
fi

if [ -z "$(which cloud-localds)" ]; then
    error "Error: could not find cloud-localds. Please install the cloud image utilities."
    usage
    exit 1
fi

if [ -z "$(which packer)" ]; then
    error "Error: could not find packer. Please install packer."
    usage
    exit 1
fi

public_key=$(cat ${PACKER_PUBLIC_KEY})

ulimit -H -n 65535
ulimit -S -n 65535

# generate cloud init user data
cat <<EOF > ${image}/user-data
#cloud-config
ssh_authorized_keys:
  - "${public_key}"
EOF

# build cloud init disk
if [ -f ${image}/user-data ]; then cloud-localds seed.img ${image}/user-data; fi

packer build ${image}/packer.json