Add support for make help

Signed-off-by: Sascha Grunert <[email protected]>

Makefile

@@ -14,64 +14,104 @@ CI_TAG ?=
 GOLANGCI_LINT_VERSION := v1.60.3
 ZEITGEIST_VERSION := v0.4.4
 
-default:
+COLOR:=\\033[36m
+NOCOLOR:=\\033[0m
+WIDTH:=25
+
+all: default
+
+.PHONY: help
+help:  ## Display this help.
+	@awk \
+		-v "col=${COLOR}" -v "nocol=${NOCOLOR}" \
+		' \
+			BEGIN { \
+				FS = ":.*##" ; \
+				printf "Usage:\n  make %s<target>%s\n", col, nocol \
+			} \
+			/^[./a-zA-Z_-]+:.*?##/ { \
+				printf "  %s%-${WIDTH}s%s %s\n", col, $$1, nocol, $$2 \
+			} \
+			/^##@/ { \
+				printf "\n%s\n", substr($$0, 5) \
+			} \
+		' $(MAKEFILE_LIST)
+
+##@ Build targets:
+
+.PHONY: default
+default: ## Build in debug mode.
 	cargo build
 
-release:
+.PHONY: release
+release: ## Build in release mode.
 	cargo build --release
 
 .PHONY: release-static
-release-static:
+release-static: ## Build the static release binary.
 	RUSTFLAGS="-C target-feature=+crt-static" cargo build --release --target x86_64-unknown-linux-gnu
 	strip -s target/x86_64-unknown-linux-gnu/release/conmonrs
 	ldd target/x86_64-unknown-linux-gnu/release/conmonrs 2>&1 | grep -qE '(statically linked)|(not a dynamic executable)'
 
-lint: lint-rust lint-go
+##@ Test targets:
+.PHONY: unit
+unit: ## Run the unit tests.
+	cargo test --no-fail-fast
+
+.PHONY: integration
+integration: .install.ginkgo release ## Run the integration tests using the release binary.
+	export CONMON_BINARY="$(MAKEFILE_PATH)target/release/$(BINARY)" && \
+	export RUNTIME_BINARY="$(RUNTIME_PATH)" && \
+	export MAX_RSS_KB=10240 && \
+	"$(GOTOOLS_BINDIR)/ginkgo" $(TEST_FLAGS) $(GINKGO_FLAGS)
+
+.PHONY: integration-static
+integration-static: .install.ginkgo ## Run the integration tests using the static release binary.
+	export CONMON_BINARY="$(MAKEFILE_PATH)target/x86_64-unknown-linux-gnu/release/$(BINARY)" && \
+	if [ ! -f "$$CONMON_BINARY" ]; then \
+		$(MAKE) release-static; \
+	fi && \
+	export RUNTIME_BINARY="$(RUNTIME_PATH)" && \
+	export MAX_RSS_KB=9500 && \
+	"$(GOTOOLS_BINDIR)/ginkgo" $(TEST_FLAGS) $(GINKGO_FLAGS)
 
-lint-rust:
+##@ Verify targets:
+
+.PHONY: lint
+lint: lint-rust lint-go ## Lint Rust and Go sources.
+
+.PHONY: lint-rust
+lint-rust: ## Lint the Rust sources.
 	cargo fmt && git diff --exit-code
 	cargo clippy --all-targets --all-features -- -D warnings
 
-lint-go: .install.golangci-lint
+.PHONY: lint-go
+lint-go: .install.golangci-lint ## Lint the Go sources.
 	$(GOTOOLS_BINDIR)/golangci-lint version
 	$(GOTOOLS_BINDIR)/golangci-lint linters
 	GL_DEBUG=gocritic $(GOTOOLS_BINDIR)/golangci-lint run
 
 .PHONY: verify-dependencies
-verify-dependencies: $(GOTOOLS_BINDIR)/zeitgeist
+verify-dependencies: $(GOTOOLS_BINDIR)/zeitgeist ## Verify the local dependencies.
 	$(GOTOOLS_BINDIR)/zeitgeist validate --local-only --base-path . --config dependencies.yaml
 
 .PHONY: verify-prettier
 verify-prettier: prettier ## Run prettier on the project.
 	./hack/tree_status.sh
 
+##@ Utility targets:
+
 .PHONY: prettier
 prettier: ## Prettify supported files.
 	$(CONTAINER_RUNTIME) run -it --privileged -v ${PWD}:/w -w /w --entrypoint bash node:latest -c \
 		'npm install -g prettier && prettier -w .'
 
-unit:
-	cargo test --no-fail-fast
-
-integration: .install.ginkgo release # It needs to be release so we correctly test the RSS usage
-	export CONMON_BINARY="$(MAKEFILE_PATH)target/release/$(BINARY)" && \
-	export RUNTIME_BINARY="$(RUNTIME_PATH)" && \
-	export MAX_RSS_KB=10240 && \
-	"$(GOTOOLS_BINDIR)/ginkgo" $(TEST_FLAGS) $(GINKGO_FLAGS)
-
-integration-static: .install.ginkgo # It needs to be release so we correctly test the RSS usage
-	export CONMON_BINARY="$(MAKEFILE_PATH)target/x86_64-unknown-linux-gnu/release/$(BINARY)" && \
-	if [ ! -f "$$CONMON_BINARY" ]; then \
-		$(MAKE) release-static; \
-	fi && \
-	export RUNTIME_BINARY="$(RUNTIME_PATH)" && \
-	export MAX_RSS_KB=9500 && \
-	"$(GOTOOLS_BINDIR)/ginkgo" $(TEST_FLAGS) $(GINKGO_FLAGS)
-
+.PHONY: .install.ginkgo
 .install.ginkgo:
 	GOBIN=$(abspath $(GOTOOLS_BINDIR)) \
 		go install "github.com/onsi/ginkgo/v2/ginkgo@$$(go list -m -f {{.Version}} github.com/onsi/ginkgo/v2)"
 
+.PHONY: .install.golangci-lint
 .install.golangci-lint:
 	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | \
 		BINDIR=$(abspath $(GOTOOLS_BINDIR)) sh -s $(GOLANGCI_LINT_VERSION)
@@ -82,42 +122,43 @@ $(GOTOOLS_BINDIR)/zeitgeist:
 		https://storage.googleapis.com/k8s-artifacts-sig-release/kubernetes-sigs/zeitgeist/$(ZEITGEIST_VERSION)/zeitgeist-amd64-linux
 	chmod +x $(GOTOOLS_BINDIR)/zeitgeist
 
-clean:
+.PHONY: clean
+clean: ## Cleanup the project files.
 	rm -rf target/
 
 .INTERMEDIATE: internal/proto/conmon.capnp
 internal/proto/conmon.capnp:
 	cat $(PROTO_PATH)/conmon.capnp $(PROTO_PATH)/go-patch > $@
 
-update-proto: internal/proto/conmon.capnp
+
+.PHONY: update-proto
+update-proto: internal/proto/conmon.capnp ## Update the Cap'n Proto protocol.
 	$(eval GO_CAPNP_VERSION ?= $(shell grep '^\s*capnproto.org/go/capnp/v3 v3\.' go.mod | grep -o 'v3\..*'))
 	go install capnproto.org/go/capnp/v3/capnpc-go@$(GO_CAPNP_VERSION)
 	capnp compile \
 		-I$(shell go env GOMODCACHE)/capnproto.org/go/capnp/v3@$(GO_CAPNP_VERSION)/std \
 		-ogo internal/proto/conmon.capnp
 
-.PHONY: lint lint-go lint-rust clean unit integration update-proto
-
 .PHONY: create-release-packages
-create-release-packages: release
+create-release-packages: release ## Create the release tarballs.
 	if [ "$(PACKAGE_NAME)" != "conmonrs-$(CI_TAG)" ]; then \
 		echo "crate version and tag mismatch" ; \
 		exit 1 ; \
 	fi
 	git archive --format tar --prefix=conmonrs-$(CI_TAG)/ $(CI_TAG) | gzip >$(PACKAGE_NAME).tar.gz
 
-
 .PHONY: install
-install:
+install: ## Install the binary.
 	mkdir -p "${DESTDIR}$(PREFIX)/bin"
 	install -D -t "${DESTDIR}$(PREFIX)/bin" target/release/conmonrs
 
 # Only meant to build the latest HEAD commit + any uncommitted changes
 # Not a replacement for the distro package
 .PHONY: rpm
-rpm:
+rpm: # Build the RPM locally
 	rpkg local
 
-nixpkgs:
+.PHONY: nixpkgs
+nixpkgs: ## Update the NIX package dependencies.
 	@nix run -f channel:nixpkgs-unstable nix-prefetch-git -- \
 		--no-deepClone https://github.com/nixos/nixpkgs > nix/nixpkgs.json