build(make): add deb and arch targets and a staged install

install now honors DESTDIR and also installs the license and README under DOCDIR, so packagers can stage a filesystem tree. Add deb (runs dpkg-buildpackage, collects the artifacts in dist/) and arch (runs makepkg) targets, plus uninstall. Ignore the Debian and Arch build output.

Makefile

@@ -2,33 +2,42 @@ BINARY  := lazyntfy
 PREFIX  ?= $(HOME)/.local
 BINDIR  ?= $(PREFIX)/bin
 MANDIR  ?= $(PREFIX)/share/man/man1
+DOCDIR  ?= $(PREFIX)/share/doc/$(BINARY)
+DESTDIR ?=
 VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null | sed 's/^v//' | grep . || echo 0.1.0)
 TOPIC   ?= alerts
+GO      ?= go
+GOFLAGS ?= -trimpath
 
 LDFLAGS := -X main.version=$(VERSION)
 
-.PHONY: build install uninstall test vet fmt run man clean
+.PHONY: all build install uninstall man test vet fmt run deb arch clean
+
+all: build
 
 build:
-	go build -ldflags "$(LDFLAGS)" -o $(BINARY) ./cmd/lazyntfy
+	$(GO) build $(GOFLAGS) -ldflags "$(LDFLAGS)" -o $(BINARY) ./cmd/lazyntfy
 
+# System-wide install: sudo make install PREFIX=/usr/local
+# Staged install:       make install DESTDIR=/tmp/pkg PREFIX=/usr
 install: build
-	mkdir -p "$(BINDIR)" "$(MANDIR)"
-	install -m 755 $(BINARY) "$(BINDIR)/$(BINARY)"
-	install -m 644 man/lazyntfy.1 "$(MANDIR)/lazyntfy.1"
+	install -Dm755 $(BINARY) "$(DESTDIR)$(BINDIR)/$(BINARY)"
+	install -Dm644 man/lazyntfy.1 "$(DESTDIR)$(MANDIR)/lazyntfy.1"
+	install -Dm644 LICENSE "$(DESTDIR)$(DOCDIR)/copyright"
+	install -Dm644 README.md "$(DESTDIR)$(DOCDIR)/README.md"
 
 uninstall:
-	rm -f "$(BINDIR)/$(BINARY)" "$(MANDIR)/lazyntfy.1"
+	rm -f "$(DESTDIR)$(BINDIR)/$(BINARY)" "$(DESTDIR)$(MANDIR)/lazyntfy.1"
+	rm -rf "$(DESTDIR)$(DOCDIR)"
 
 man:
-	mkdir -p "$(MANDIR)"
-	install -m 644 man/lazyntfy.1 "$(MANDIR)/lazyntfy.1"
+	install -Dm644 man/lazyntfy.1 "$(DESTDIR)$(MANDIR)/lazyntfy.1"
 
 test:
-	go test ./...
+	$(GO) test ./...
 
 vet:
-	go vet ./...
+	$(GO) vet ./...
 
 fmt:
 	gofmt -w .
@@ -36,5 +45,19 @@ fmt:
 run: build
 	./$(BINARY) $(TOPIC)
 
+# Build a Debian/Ubuntu package. -d skips build-dependency checks so the
+# package can also be built on a machine without golang-go installed as a
+# distro package.
+deb:
+	dpkg-buildpackage -us -uc -b -d
+	mkdir -p dist
+	mv -f ../$(BINARY)_*_*.deb ../$(BINARY)_*_*.changes ../$(BINARY)_*_*.buildinfo dist/ 2>/dev/null || true
+	@echo "  packages written to dist/"
+
+arch:
+	cd packaging/archlinux && makepkg -f
+
 clean:
 	rm -f $(BINARY)
+	rm -rf dist
+	-$(MAKE) -f debian/rules clean