# Copyright 2019 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.

# Old-skool build tools.
# Simple makefile to build kind quickly and reproducibly
#
# Common uses:
# - installing kind: `make install INSTALL_DIR=$HOME/go/bin`
# - building: `make build`
# - cleaning up and starting over: `make clean`
#
################################################################################
# ========================== Capture Environment ===============================
# get the repo root and output path
REPO_ROOT:=${CURDIR}
OUT_DIR=$(REPO_ROOT)/bin
# record the source commit in the binary, overridable
COMMIT?=$(shell git rev-parse HEAD 2>/dev/null)
# count the commits since the last release
COMMIT_COUNT?=$(shell git describe --tags | rev | cut -d- -f2 | rev)
################################################################################
# ========================= Setup Go With Gimme ================================
# go version to use for build etc.
# setup correct go version with gimme
GOTOOLCHAIN:=$(shell . hack/build/gotoolchain.sh && echo "$${GOTOOLCHAIN}")
PATH:=$(shell . hack/build/setup-go.sh && echo "$${PATH}")
# go1.9+ can autodetect GOROOT, but if some other tool sets it ...
GOROOT:=
# enable modules
GO111MODULE=on
# disable CGO by default for static binaries
CGO_ENABLED=0
export PATH GOROOT GO111MODULE CGO_ENABLED GOTOOLCHAIN
# work around broken PATH export
SPACE:=$(subst ,, )
SHELL:=env PATH=$(subst $(SPACE),\$(SPACE),$(PATH)) $(SHELL)
################################################################################
# ============================== OPTIONS =======================================
# install tool
INSTALL?=install
# install will place binaries here, by default attempts to mimic go install
INSTALL_DIR?=$(shell hack/build/goinstalldir.sh)
# the output binary name, overridden when cross compiling
KIND_BINARY_NAME?=kind
# build flags for the kind binary
# - reproducible builds: -trimpath and -ldflags=-buildid=
# - smaller binaries: -s -w (strip binary and trim debugger data, but not panics)
# - metadata: -X=... to bake in git commit
KIND_VERSION_PKG:=sigs.k8s.io/kind/pkg/cmd/kind/version
KIND_BUILD_LD_FLAGS:=-X=$(KIND_VERSION_PKG).gitCommit=$(COMMIT) -X=$(KIND_VERSION_PKG).gitCommitCount=$(COMMIT_COUNT)
KIND_BUILD_FLAGS?=-trimpath -ldflags="-buildid= -s -w $(KIND_BUILD_LD_FLAGS)"
################################################################################
# ================================= Building ===================================
# standard "make" target -> builds
all: build
# builds kind in a container, outputs to $(OUT_DIR)
kind:
	go build -v -o "$(OUT_DIR)/$(KIND_BINARY_NAME)" $(KIND_BUILD_FLAGS)
# alias for building kind
build: kind
# use: make install INSTALL_DIR=/usr/local/bin
install: build
	$(INSTALL) -d $(INSTALL_DIR)
	$(INSTALL) "$(OUT_DIR)/$(KIND_BINARY_NAME)" "$(INSTALL_DIR)/$(KIND_BINARY_NAME)"
################################################################################
# ================================= Testing ====================================
# unit tests (hermetic)
unit:
	MODE=unit hack/make-rules/test.sh
# integration tests
integration:
	MODE=integration hack/make-rules/test.sh
# all tests
test:
	hack/make-rules/test.sh
################################################################################
# ================================= Cleanup ====================================
# standard cleanup target
clean:
	rm -rf "$(OUT_DIR)/"
################################################################################
# ============================== Auto-Update ===================================
# update generated code, gofmt, etc.
update:
	hack/make-rules/update/all.sh
# update generated code
generate:
	hack/make-rules/update/generated.sh
# gofmt
gofmt:
	hack/make-rules/update/gofmt.sh
################################################################################
# ================================== Linting ===================================
# run linters, ensure generated code, etc.
verify:
	hack/make-rules/verify/all.sh
# code linters
lint:
	hack/make-rules/verify/lint.sh
# shell linter
shellcheck:
	hack/make-rules/verify/shellcheck.sh
#################################################################################
.PHONY: all kind build install unit clean update generate gofmt verify lint shellcheck
