Makefile

BIN     := gitnotesync
VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
LDFLAGS := -s -w -X github.com/kvth/gitnotesync/cmd.Version=$(VERSION)

# Packages are for ARCH (Go's name: amd64, arm64, ...) and built from a release:
# their version is the vX.Y.Z tag on HEAD, with the tree clean
ARCH        ?= $(shell go env GOARCH)
PKG_VERSION  = $(patsubst v%,%,$(VERSION))

# nfpm installed by install-deps; nfpm from PATH is used if there is one
NFPM_VERSION ?= v2.47.0
GO_BIN = $(or $(shell go env GOBIN 2>/dev/null),$(shell go env GOPATH 2>/dev/null)/bin)
NFPM ?= $(or $(shell command -v nfpm 2>/dev/null),$(GO_BIN)/nfpm)

.PHONY: build test vet fmt packages deb rpm package-files check-version install-deps clean

build:
	go build -ldflags '$(LDFLAGS)' -o $(BIN) .

test:
	go test ./...

vet:
	go vet ./...

fmt:
	gofmt -l -w .

packages: deb rpm

deb rpm: package-files
	ARCH=$(ARCH) PKG_VERSION=$(PKG_VERSION) $(NFPM) package -p $@ -t build/

# What nfpm.yaml packs: a static binary for ARCH, completions generated by a
# host build (the ARCH one may not run here), and the unit started from /usr/bin
package-files: check-version
	mkdir -p build/completions
	CGO_ENABLED=0 GOOS=linux GOARCH=$(ARCH) go build -trimpath -ldflags '$(LDFLAGS)' -o build/$(BIN) .
	for sh in bash zsh fish; do go run . completion $$sh > build/completions/$(BIN).$$sh || exit 1; done
	sed 's|%h/\.local/bin/$(BIN)|/usr/bin/$(BIN)|' contrib/systemd/$(BIN)@.service > build/$(BIN)@.service
	@grep -q '^ExecStart=/usr/bin/$(BIN) ' build/$(BIN)@.service || { echo "ExecStart in contrib/systemd/$(BIN)@.service not rewritten to /usr/bin" >&2; exit 1; }

check-version:
	@echo '$(PKG_VERSION)' | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$$' || { echo "version '$(VERSION)' is not a release: tag it with git tag vX.Y.Z and commit any changes" >&2; exit 1; }

install-deps:
	@command -v go >/dev/null || { echo "go missing: install Go first, e.g. apt install golang-go" >&2; exit 1; }
	go install github.com/goreleaser/nfpm/v2/cmd/nfpm@$(NFPM_VERSION)

clean:
	rm -f $(BIN)
	rm -rf build