# UID/GID
# UID or GID is the UNIX user ID or group ID of the user who executes
# make. If the UID or GID is not passed as a make variable, an attempt
# is made to determine it.
UID?=$(shell id --user)
GID?=$(shell id --group)

# VERSION
# If no version is specified as a parameter of make, the last git hash
# value is taken.
VERSION:=$(or ${TRAVIS_TAG}, ${TRAVIS_TAG}, $(shell git rev-parse --short HEAD)-git)

GOARCH?=amd64
GOOS?=linux

# default build
build:
	GOOS=${GOOS} \
	GOARCH=${GOARCH} \
		go build -ldflags "-X main.version=${VERSION}"
	chown -R ${UID}:${GID} *

docker-build:
	docker run \
		--volume ${PWD}:/workspace \
		volkerraschek/build-image:1.0.0 \
			make build UID=${UID} GID=${GID} VERSION=${VERSION} GOOS=${GOOS} GOARCH=${GOARCH}