#!/bin/sh

# Usage: ./cloud/aws/copy-amis.sh 
# Assumptions: 
# - A finished Moby AMI ID has been deposited in ./cloud/aws/ami_id.out.  (This is
#   the behavior of the ./cloud/aws/bake-ami.sh script)
# - (recommended) IMAGE_NAME is set to a custom value (e.g., "Moby Linux")
# - (recommended) IMAGE_DESCRIPTION is set to a custom value (e.g., "1.12-0-tp1")
#
# 
# Outputs: 
# - A file of newline delimited AMI IDs representing the AMI for each region.
# - A file containing a subsection of a CloudFormation template outlining these AMIs (JSON).

set -e

. "cloud/build-common.sh"
. "cloud/aws/common.sh"

SOURCE_AMI_ID=$(cat ./cloud/aws/ami_id.out)

# To have a list of just the IDs (approve accounts later if desired)
AMIS_IDS_DEST="./cloud/aws/copied_image_regions_${SOURCE_AMI_ID}.out"

# File to drop the (mostly correct) CF template section in
CF_TEMPLATE="./cloud/aws/cf_image_regions_${SOURCE_AMI_ID}.out"

cfecho()
{
	echo "$@" >>${CF_TEMPLATE}
}

cfprintf()
{
	printf "$@" >>${CF_TEMPLATE}
}

if [ -f ${AMIS_IDS_DEST} ]
then
	rm ${AMIS_IDS_DEST}
fi

if [ -f ${CF_TEMPLATE} ]
then
	rm ${CF_TEMPLATE}
fi

cfecho '"AWSRegionArch2AMI": {'

REGIONS="us-west-1 us-west-2 us-east-1 eu-west-1 eu-central-1 ap-southeast-1 ap-northeast-1 ap-southeast-2 ap-northeast-2 sa-east-1"

# (last element of array to emit no comma for JSON)
LAST_REGION="${REGIONS##* }"

for REGION in ${REGIONS}
do
	REGION_AMI_ID=$(aws ec2 copy-image \
		--source-region $(current_instance_region) \
		--source-image-id "${SOURCE_AMI_ID}"  \
		--region "${REGION}" \
		--name "${IMAGE_NAME}" \
		--description "${IMAGE_DESCRIPTION}" | jq -r .ImageId)

	echo "${REGION_AMI_ID}"

	echo "${REGION} ${REGION_AMI_ID}" >>${AMIS_IDS_DEST}

	cfprintf "	\"${REGION}\": {
		\"HVM64\": \"${REGION_AMI_ID}\",
		\"HVMG2\": \"NOT_SUPPORTED\"
	}"

	# TODO: Not amazing way to determine last element.
	if [ ${REGION} != "${LAST_REGION}" ]
	then
		cfecho ","
	else
		cfecho
	fi
done

cfecho "}"

echo "All done.  The results for adding to CloudFormation can be"
echo "viewed here:"
arrowecho ${CF_TEMPLATE}
echo
echo "The plain list of AMIs can be viewed here:"
arrowecho ${AMIS_IDS_DEST}