#!/usr/bin/env bash
set -exu;
env | sort | grep -v DRONE
echo $PLUGIN_ARCH | base64 -w0
##
## check input
##

BUILDCTL_CONTEXT=${PLUGIN_CONTEXT:-$(pwd)}
BUILDCTL_DOCKERFILE=$(dirname "${PLUGIN_DOCKERFILE:-$BUILDCTL_CONTEXT/Dockerfile}")
if [[ ! -f $BUILDCTL_DOCKERFILE/Dockerfile ]]; then
	echo "Dockerfile $BUILDCTL_DOCKERFILE/Dockerfile not found!"
	exit 1
fi
BUILDCTL_FRONTEND=${PLUGIN_FRONTEND:-dockerfile.v0}
if [[ "$BUILDCTL_FRONTEND" != "dockerfile.v0" ]]; then
	echo "Only frontend 'dockerfile.v0' testet and supported yet."
	exit 1
fi
SOURCE_DATE_EPOCH=${PLUGIN_SOURCE_DATE_EPOCH:-0}

##
## build command
##

COMMAND="buildctl"
COMMAND="$COMMAND build"
if [[ -n "${PLUGIN_ADDR:-}" ]]; then
	COMMAND="$COMMAND --addr $PLUGIN_ADDR"
fi
COMMAND="$COMMAND --frontend $BUILDCTL_FRONTEND"
COMMAND="$COMMAND --local context='$BUILDCTL_CONTEXT'"
COMMAND="$COMMAND --local dockerfile='$BUILDCTL_DOCKERFILE'"
if [[ "${PLUGIN_PLATFORM:-}" == "true" ]]; then
	COMMAND="$COMMAND --opt platform='$PLUGIN_PLATFORM'"
fi
# https://github.com/moby/buildkit/blob/master/README.md#output
OUTPUT=""
if [[ "${PLUGIN_NAME:-}" == "true" ]]; then
	OUTPUT="$OUTPUT --output type=image,\"name=$PLUGIN_NAME\",push=${PLUGIN_PUSH:-true},oci-mediatypes=true,oci-artifact=true,compression=estargz"
	OUTPUT="$OUTPUT,oci-mediatypes=true,oci-artifact=true,compression=estargz,compression-level=9"
	OUTPUT="$OUTPUT,rewrite-timestamp=true"
	export IFS=";"
	for PLUGIN_ANNOTATION_ITEM in "${PLUGIN_ANNOTATION:-}"; do
		OUTPUT="$OUTPUT,annotation.$PLUGIN_ANNOTATION_ITEM"
	done
fi
COMMAND="$COMMAND $OUTPUT"

# custom args, e.g. docker run --rm --volume=$HOME:HOME:ro --workdir=$PWD kokuwaio/buildkit --opt buildarg=foo=bar
if [[ -n "${1:-}" ]]; then
	COMMAND="$COMMAND $*"
fi

##
## execute command
##

echo "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH docker buildx build ${PLUGIN_CONTEXT:-.}"
if [[ "${PLUGIN_PLATFORM:-}" == "true" ]]; then
	echo "  --platform='$PLUGIN_PLATFORM'"
	echo "  $OUTPUT"
fi

echo -e "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH ${COMMAND// --/\\n  --}\n"
eval "$COMMAND"