SHELL := /bin/bash
.SHELLFLAGS := -eu -o pipefail -c

ROOT_DIR := $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST))))
RELATIVE_DIR := $(shell echo $(realpath .) | sed "s;$(ROOT_DIR)[/]*;;")
include $(ROOT_DIR)/Makefile.quiet

PREFIX?=/usr
BINDIR?=$(PREFIX)/bin
CNIBINDIR?=/opt/cni/bin
CNICONFDIR?=/etc/cni/net.d
LIBDIR?=$(PREFIX)/lib
RUNDIR?=/var/run
CONFDIR?=/etc

GOLIST ?= GO111MODULE=off
ifeq ($(GO),)
	GO = go
endif

INSTALL = $(QUIET)install

CGO_DISABLED = CGO_ENABLED=0
VERSION = $(shell cat $(dir $(lastword $(MAKEFILE_LIST)))/VERSION)
VERSION_MAJOR = $(shell cat $(dir $(lastword $(MAKEFILE_LIST)))/VERSION | cut -d. -f1)
# Use git only if in a Git repo
ifneq ($(wildcard $(dir $(lastword $(MAKEFILE_LIST)))/.git),)
	GIT_VERSION = $(shell git show -s --format='format:%h %aI')
else
	GIT_VERSION = $(shell cat $(ROOT_DIR)/GIT_VERSION)
endif
BUILD = $(VERSION) $(GIT_VERSION) $(shell go version)
GOLDFLAGS = -X "github.com/cilium/cilium/pkg/version.Version=$(BUILD)"

CILIUM_ENVOY_SHA=$(shell grep -o "FROM.*cilium/cilium-envoy:[0-9a-fA-F]*" $(ROOT_DIR)/Dockerfile | cut -d : -f 2)
GOLDFLAGS += -X "github.com/cilium/cilium/pkg/envoy.RequiredEnvoyVersionSHA=$(CILIUM_ENVOY_SHA)"
GOLDFLAGS += -X "github.com/cilium/cilium/pkg/datapath/loader.DatapathSHA=$(GO_BINDATA_SHA1SUM)"

# Set DOCKER_IMAGE_TAG with "latest" by default
ifeq ($(DOCKER_IMAGE_TAG),)
    DOCKER_IMAGE_TAG="latest"
endif

# Set -mod=vendor if running >= go 1.13 or if GO111MODULE is set.
# A go build is being executed with go modules if:
# * The go command is invoked with GO111MODULE=on environment variable set.
# * The go command is invoked in a directory outside of the $GOPATH/src tree
#   and the environment variable GO111MODULE unset (or explicitly set to 'auto').
ifeq ($(GO111MODULE),on)
    GOFLAGS ?= -mod=vendor
    GOCLEAN ?= -mod=vendor
endif
# Compile with '-mod=vendor' if go >= 1.13
GO_MAJOR_VERSION_GE_1 := $(shell expr `go version | grep -E 'go[0-9]{1}+' -o | sed 's/go//g'` \>= 1)
ifeq ($(GO_MAJOR_VERSION_GE_1),1)
    GO_MINOR_VERSION_GE_13 := $(shell expr `go version | grep -E 'go[^ ]+' -o | sed 's/go1.//g'` \>= 13)
    ifeq ($(GO_MINOR_VERSION_GE_13),1)
        GOFLAGS ?= -mod=vendor
        GOCLEAN ?= -mod=vendor
    endif
endif

GOBUILD = $(GOFLAGS) -ldflags '$(GOLDFLAGS)' $(EXTRA_GOBUILD_FLAGS)

# Uncomment to enable race detection
#GOBUILD += -race

# Uncomment to enable deadlock detection
#GOBUILD += -tags lockdebug

ifneq ($(LOCKDEBUG),)
    GOBUILD += -tags lockdebug
endif

# Container engine
CONTAINER_ENGINE?=docker
CONTAINER_ENGINE_FULL=$(QUIET)$(CONTAINER_ENGINE)