# Copyright 2017-2020 Authors of Cilium
# SPDX-License-Identifier: Apache-2.0

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

# define a function replacing spaces with commas in a list
empty :=
space := $(empty) $(empty)
comma := ,
join-with-comma = $(subst $(space),$(comma),$(strip $1))

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
LOCALSTATEDIR?=/var
RUNDIR?=/var/run
CONFDIR?=/etc
export GOARCH ?= $(shell $(GO) env GOARCH)

INSTALL = install

CONTAINER_ENGINE?=docker
DOCKER_FLAGS?=
DOCKER_BUILD_FLAGS?=

# Set DOCKER_DEV_ACCOUNT with "cilium" by default
ifeq ($(DOCKER_DEV_ACCOUNT),)
    DOCKER_DEV_ACCOUNT=cilium
endif

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

ifeq ($(shell uname -m),aarch64)
    ETCD_IMAGE=quay.io/coreos/etcd:v3.3.20-arm64
else
    ETCD_IMAGE=quay.io/coreos/etcd:v3.3.20
endif

CONSUL_IMAGE=consul:1.7.2

GO ?= go

# go build/test/clean flags
# these are declared here so they are treated explicitly
# as non-immediate variables
GO_BUILD_FLAGS =
GO_TEST_FLAGS =
GO_CLEAN_FLAGS =
GO_BUILD_LDFLAGS =
# go build/test -tags values
GO_TAGS_FLAGS = osusergo

# This is declared here as it is needed to change the covermode depending on if
# RACE is specified.
GOTEST_COVER_OPTS =

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
FULL_BUILD_VERSION = $(VERSION) $(GIT_VERSION)
GO_BUILD_LDFLAGS += -X "github.com/cilium/cilium/pkg/version.ciliumVersion=$(FULL_BUILD_VERSION)"

ifeq ($(NOSTRIP),)
    # Note: these options will not remove annotations needed for stack
    # traces, so panic backtraces will still be readable.
    #
    # -w: Omit the DWARF symbol table.
    # -s: Omit the symbol table and debug information.
    GO_BUILD_LDFLAGS += -s -w
endif

ifneq ($(wildcard $(dir $(lastword $(MAKEFILE_LIST)))/images/cilium/Dockerfile),)
    CILIUM_ENVOY_REF=$(shell sed -E -e 's/^FROM (--[^ ]* )*([^ ]*) as cilium-envoy/\2/p;d' < $(ROOT_DIR)/images/cilium/Dockerfile)
    CILIUM_ENVOY_SHA=$(shell echo $(CILIUM_ENVOY_REF) | sed -E -e 's/[^/]*\/[^:]*:(.*-)?([^:@]*).*/\2/p;d')
    GO_BUILD_LDFLAGS += -X "github.com/cilium/cilium/pkg/envoy.RequiredEnvoyVersionSHA=$(CILIUM_ENVOY_SHA)"
endif

# Use git only if in a Git repo, otherwise find the files from the file system
BPF_SRCFILES_IGNORE = bpf/.gitignore
ifneq ($(wildcard $(dir $(lastword $(MAKEFILE_LIST)))/.git),)
    BPF_SRCFILES := $(shell git ls-files $(ROOT_DIR)/bpf/ | LC_ALL=C sort | tr "\n" ' ')
else
    # this line has to be in-sync with bpf/.gitignore, please note usage of make patterns like `%.i`
    BPF_SRCFILES_IGNORE += bpf/cilium-probe-kernel-hz bpf/%.i bpf/%.s bpf/.rebuild_all
    BPF_SRCFILES := $(shell find $(ROOT_DIR)/bpf/ -type f | LC_ALL=C sort | tr "\n" ' ')
endif

# ROOT_DIR can be either `../` or absolute path, each of these need to be stripped
BPF_SRCFILES := $(filter-out $(BPF_SRCFILES_IGNORE),$(subst ../,,$(subst $(ROOT_DIR)/,,$(BPF_SRCFILES))))
CILIUM_DATAPATH_SHA256=$(shell cd $(ROOT_DIR); cat $(BPF_SRCFILES) | sha256sum | awk '{print $$1}')
GO_BUILD_LDFLAGS += -X "github.com/cilium/cilium/pkg/datapath/loader.DatapathSHA256=$(CILIUM_DATAPATH_SHA256)"

# 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)
    GO_BUILD_FLAGS += -mod=vendor
    GO_TEST_FLAGS += -mod=vendor
    GO_CLEAN_FLAGS += -mod=vendor
else
    GO_MAJOR_VERSION_GE_1 := $(shell expr `$(GO) version | grep -E 'go[0-9]+' -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)
            GO_BUILD_FLAGS += -mod=vendor
            GO_TEST_FLAGS += -mod=vendor
            GO_CLEAN_FLAGS += -mod=vendor
        endif
    endif
endif

GO_BUILD = CGO_ENABLED=0 $(GO) build
# Currently crosscompiling only enabled for arm64 targets
CGO_CC =
ifeq ($(GOARCH),arm64)
    CGO_CC = CC=aarch64-linux-gnu-gcc
endif
GO_BUILD_WITH_CGO = CGO_ENABLED=1 $(CGO_CC) $(GO) build

ifneq ($(RACE),)
    GO_BUILD_FLAGS += -race
    GO_TEST_FLAGS += -race
    GOTEST_COVER_OPTS += -covermode=atomic

    # GO_BUILD becomes GO_BUILD_WITH_CGO as `-race` requires CGO
    GO_BUILD = $(GO_BUILD_WITH_CGO)
    ifeq ($(LOCKDEBUG),)
        LOCKDEBUG=1
    endif
else
    GOTEST_COVER_OPTS += -covermode=count
endif

ifneq ($(LOCKDEBUG),)
    GO_TAGS_FLAGS += lockdebug
endif

GO_BUILD_FLAGS += -ldflags '$(GO_BUILD_LDFLAGS) $(EXTRA_GO_BUILD_LDFLAGS)' -tags=$(call join-with-comma,$(GO_TAGS_FLAGS)) $(EXTRA_GO_BUILD_FLAGS)
GO_TEST_FLAGS += -tags=$(call join-with-comma,$(GO_TAGS_FLAGS))

ifeq ($(NOOPT),1)
    GO_BUILD_FLAGS += -gcflags="all=-N -l"
endif

GO_BUILD += $(GO_BUILD_FLAGS)
GO_BUILD_WITH_CGO += $(GO_BUILD_FLAGS)

GO_TEST = $(GO) test $(GO_TEST_FLAGS)
GO_CLEAN = $(GO) clean $(GO_CLEAN_FLAGS)
# TODO: remove `GO111MODULE=off` once Go 1.13 is deprecated by Go maintainers
GO_VET = GO111MODULE=off $(GO) vet
GO_LIST = GO111MODULE=off $(GO) list

ifeq ($(BASE_IMAGE),)
    BASE_IMAGE=scratch
endif

HELM_TOOLBOX_VERSION ?= "v1.0.1"
HELM_TOOLBOX_SHA ?= "a1483fc036b15c290326ba7ed36b8f0b714e185913b72a6074c04225d74e034c"
HELM_TOOLBOX_IMAGE ?= "quay.io/cilium/helm-toolbox:$(HELM_TOOLBOX_VERSION)@sha256:$(HELM_TOOLBOX_SHA)"