# Set an output prefix, which is the local directory if not specified
PREFIX?=$(shell pwd)

# Setup name variables for the package/tool
NAME := reg
PKG := github.com/jessfraz/$(NAME)

# Set any default go build tags
BUILDTAGS :=

# Set the build dir, where built cross-compiled binaries will be output
BUILDDIR := ${PREFIX}/cross

# Populate version variables
# Add to compile time flags
VERSION := $(shell cat VERSION)
GITCOMMIT := $(shell git rev-parse --short HEAD)
GITUNTRACKEDCHANGES := $(shell git status --porcelain --untracked-files=no)
ifneq ($(GITUNTRACKEDCHANGES),)
	GITCOMMIT := $(GITCOMMIT)-dirty
endif
CTIMEVAR=-X $(PKG)/version.GITCOMMIT=$(GITCOMMIT) -X $(PKG)/version.VERSION=$(VERSION)
GO_LDFLAGS=-ldflags "-w $(CTIMEVAR)"
GO_LDFLAGS_STATIC=-ldflags "-w $(CTIMEVAR) -extldflags -static"

# List the GOOS and GOARCH to build
GOOSARCHES = darwin/amd64 darwin/386 freebsd/amd64 freebsd/386 linux/arm linux/arm64 linux/amd64 linux/386 solaris/amd64 windows/amd64 windows/386

all: clean build fmt lint test vet install ## Runs a clean, build, fmt, lint, test, vet and install

.PHONY: build
build: $(NAME) ## Builds a dynamic executable or package

$(NAME): *.go VERSION
	@echo "+ $@"
	go build -tags "$(BUILDTAGS)" ${GO_LDFLAGS} -o $(NAME) .

.PHONY: static
static: ## Builds a static executable
	@echo "+ $@"
	CGO_ENABLED=0 go build \
				-tags "$(BUILDTAGS) static_build" \
				${GO_LDFLAGS_STATIC} -o $(NAME) .

.PHONY: fmt
fmt: ## Verifies all files have men `gofmt`ed
	@echo "+ $@"
	@gofmt -s -l . | grep -v '.pb.go:' | grep -v vendor | tee /dev/stderr

.PHONY: lint
lint: ## Verifies `golint` passes
	@echo "+ $@"
	@golint ./... | grep -v '.pb.go:' | grep -v vendor | tee /dev/stderr

.PHONY: test
test: ## Runs the go tests
	@echo "+ $@"
	@go test -v -tags "$(BUILDTAGS) cgo" $(shell go list ./... | grep -v vendor)

.PHONY: vet
vet: ## Verifies `go vet` passes
	@echo "+ $@"
	@go vet $(shell go list ./... | grep -v vendor) | grep -v '.pb.go:' | tee /dev/stderr

.PHONY: install
install: ## Installs the executable or package
	@echo "+ $@"
	@go install .

define buildpretty
mkdir -p $(BUILDDIR)/$(1)/$(2);
GOOS=$(1) GOARCH=$(2) CGO_ENABLED=0 go build \
	 -o $(BUILDDIR)/$(1)/$(2)/$(NAME) \
	 -a -tags "$(BUILDTAGS) static_build netgo" \
	 -installsuffix netgo ${GO_LDFLAGS_STATIC} .;
endef

.PHONY: cross
cross: *.go VERSION ## Builds the cross-compiled binaries, creating a clean directory structure (eg. GOOS/GOARCH/binary)
	@echo "+ $@"
	$(foreach GOOSARCH,$(GOOSARCHES), $(call buildpretty,$(subst /,,$(dir $(GOOSARCH))),$(notdir $(GOOSARCH))))

define buildrelease
GOOS=$(1) GOARCH=$(2) CGO_ENABLED=0 go build \
	 -o $(BUILDDIR)/$(NAME)-$(1)-$(2) \
	 -a -tags "$(BUILDTAGS) static_build netgo" \
	 -installsuffix netgo ${GO_LDFLAGS_STATIC} .;
endef

.PHONY: release
release: *.go VERSION ## Builds the cross-compiled binaries, naming them in such a way for release (eg. binary-GOOS-GOARCH)
	@echo "+ $@"
	$(foreach GOOSARCH,$(GOOSARCHES), $(call buildrelease,$(subst /,,$(dir $(GOOSARCH))),$(notdir $(GOOSARCH))))

.PHONY: tag
tag: ## Create a new git tag to prepare to build a release
	git tag -sa $(VERSION) -m "$(VERSION)"
	@echo "Run git push origin $(VERSION) to push your new tag to GitHub and trigger a travis build."

.PHONY: clean
clean: ## Cleanup any build binaries or packages
	@echo "+ $@"
	$(RM) $(NAME)
	$(RM) -r $(BUILDDIR)
	$(RM) -r $(CURDIR)/.certs

# set the graph driver as the current graphdriver if not set
DOCKER_GRAPHDRIVER := $(if $(DOCKER_GRAPHDRIVER),$(DOCKER_GRAPHDRIVER),$(shell docker info 2>&1 | grep "Storage Driver" | sed 's/.*: //'))
export DOCKER_GRAPHDRIVER

# if this session isn't interactive, then we don't want to allocate a
# TTY, which would fail, but if it is interactive, we do want to attach
# so that the user can send e.g. ^C through.
INTERACTIVE := $(shell [ -t 0 ] && echo 1 || echo 0)
ifeq ($(INTERACTIVE), 1)
	DOCKER_FLAGS += -t
endif

.PHONY: dind
DIND_CONTAINER=reg-dind
DIND_DOCKER_IMAGE=r.j3ss.co/docker:userns
dind: ## Starts a docker-in-docker container for running the tests with
	docker build --rm --force-rm -f Dockerfile.dind -t $(DIND_DOCKER_IMAGE) .
	docker run -d  \
		-v /var/lib/docker2:/var/lib/docker \
		--name $(DIND_CONTAINER) \
		--privileged \
		-v $(CURDIR)/.certs:/etc/docker/ssl \
		-v $(CURDIR):/go/src/github.com/jessfraz/reg \
		-v /tmp:/tmp \
		$(DIND_DOCKER_IMAGE) \
		docker daemon -D --storage-driver $(DOCKER_GRAPHDRIVER) \
		-H tcp://127.0.0.1:2375 \
		--host=unix:///var/run/docker.sock \
		--disable-legacy-registry=true \
		--exec-opt=native.cgroupdriver=cgroupfs \
		--insecure-registry localhost:5000 \
		--tlsverify \
		--tlscacert=/etc/docker/ssl/ca.pem \
		--tlskey=/etc/docker/ssl/key.pem \
		--tlscert=/etc/docker/ssl/cert.pem

.PHONY: dtest
DOCKER_IMAGE := reg-dev
dtest: ## Run the tests in a docker container
	docker build --rm --force-rm -f Dockerfile.dev -t $(DOCKER_IMAGE) .
	docker run --rm -i $(DOCKER_FLAGS) \
		-v $(CURDIR):/go/src/github.com/jessfraz/reg \
		--workdir /go/src/github.com/jessfraz/reg \
		-v $(CURDIR)/.certs:/etc/docker/ssl:ro \
		-v /tmp:/tmp \
		--net container:$(DIND_CONTAINER) \
		-e DOCKER_HOST=tcp://127.0.0.1:2375 \
		-e DOCKER_TLS_VERIFY=true \
		-e DOCKER_CERT_PATH=/etc/docker/ssl \
		-e DOCKER_API_VERSION=1.23 \
		$(DOCKER_IMAGE) \
		make test

.PHONY: help
help:
	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'