# Copyright 2016 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# The binary to build (just the basename).
BIN := myapp

# This repo's root import path (under GOPATH).
PKG := github.com/thockin/go-build-template

# Where to push the docker image.
REGISTRY ?= thockin

# Which architecture to build - see $(ALL_ARCH) for options.
ARCH ?= amd64

###
### These variables should not need tweaking.
###

SRC_DIRS := cmd pkg # directories which hold app source (not vendored)

ALL_ARCH := amd64 arm arm64 ppc64le # TODO: base image for non-x86 archs?

IMAGE := $(REGISTRY)/$(BIN)-$(ARCH)

BUILD_IMAGE ?= golang:1.7-alpine

VERSION := 
TAG := $(shell git describe --abbrev=0 --tags HEAD 2>/dev/null)
COMMIT := $(shell git rev-parse HEAD)
ifeq ($(TAG),)
    VERSION := unknown-$(COMMIT)
else
    ifeq ($(COMMIT), $(shell git rev-list -n1 $(TAG)))
        VERSION := $(TAG)
    else
        VERSION := $(TAG)-$(COMMIT)
    endif
endif
DIRTY := $(shell test -z "$$(git diff --shortstat 2>/dev/null)" || echo -dirty)
VERSION := $(VERSION)$(DIRTY)

# If you want to build all binaries, see the 'all-build' rule.
# If you want to build all containers, see the 'all-container' rule.
# If you want to build AND push all containers, see the 'all-push' rule.
all: build

build-%:
	@$(MAKE) --no-print-directory ARCH=$* build

container-%:
	@$(MAKE) --no-print-directory ARCH=$* container

push-%:
	@$(MAKE) --no-print-directory ARCH=$* push

all-build: $(addprefix build-, $(ALL_ARCH))

all-container: $(addprefix container-, $(ALL_ARCH))

all-push: $(addprefix push-, $(ALL_ARCH))

build: bin/$(ARCH)/$(BIN)

bin/$(ARCH)/$(BIN): build-dirs
	@echo "building: $@"
	@docker run                                                            \
	    -ti                                                                \
	    -u $$(id -u):$$(id -g)                                             \
	    -v $$(pwd)/.go:/go                                                 \
	    -v $$(pwd):/go/src/$(PKG)                                          \
	    -v $$(pwd)/bin/$(ARCH):/go/bin                                     \
	    -v $$(pwd)/.go/std/$(ARCH):/usr/local/go/pkg/linux_$(ARCH)_static  \
	    -w /go/src/$(PKG)                                                  \
	    $(BUILD_IMAGE)                                                     \
	    /bin/sh -c "                                                       \
	        ARCH=$(ARCH)                                                   \
	        VERSION=$(VERSION)                                             \
	        PKG=$(PKG)                                                     \
	        ./build/build.sh                                               \
	    "

DOTFILE_IMAGE = $(subst /,_,$(IMAGE))-$(VERSION)

container: .container-$(DOTFILE_IMAGE) container-name
.container-$(DOTFILE_IMAGE): bin/$(ARCH)/$(BIN) Dockerfile
	@docker build -t $(IMAGE):$(VERSION) --build-arg ARCH=$(ARCH) .
	@docker images -q $(IMAGE):$(VERSION) > $@

container-name:
	@echo "container: $(IMAGE):$(VERSION)"

push: .push-$(DOTFILE_IMAGE) push-name
.push-$(DOTFILE_IMAGE): .container-$(DOTFILE_IMAGE)
	@gcloud docker push $(IMAGE):$(VERSION)
	@docker images -q $(IMAGE):$(VERSION) > $@

push-name:
	@echo "pushed: $(IMAGE):$(VERSION)"

version:
	@echo $(VERSION)

test: build-dirs
	@docker run                                                            \
	    -ti                                                                \
	    -u $$(id -u):$$(id -g)                                             \
	    -v $$(pwd)/.go:/go                                                 \
	    -v $$(pwd):/go/src/$(PKG)                                          \
	    -v $$(pwd)/bin/$(ARCH):/go/bin                                     \
	    -v $$(pwd)/.go/std/$(ARCH):/usr/local/go/pkg/linux_$(ARCH)_static  \
	    -w /go/src/$(PKG)                                                  \
	    $(BUILD_IMAGE)                                                     \
	    /bin/sh -c "                                                       \
	        ./build/test.sh $(SRC_DIRS)                                    \
	    "

build-dirs:
	@mkdir -p bin/$(ARCH)
	@mkdir -p .go/src/$(PKG) .go/pkg .go/bin .go/std/$(ARCH)

clean: container-clean bin-clean

container-clean:
	rm -rf .container-* .push-*

bin-clean:
	rm -rf .go bin