#!/usr/bin/make -f
export DH_VERBOSE = 1
export deb_build_dir = /tmp/deb_build
export name = occlum-toolchains-golang
export buildroot := $(deb_build_dir)/$(name)/debian/$(name)

export tmp_build_dir = $(deb_build_dir)/$(name)/tmp_build
export install_dir = $(buildroot)/opt/occlum/toolchains/golang

SHELL = /bin/bash

# Needed by musl-cross-make config
TARGET = x86_64-linux-musl
GCC_VER = 8.3.0
GO_VERSION = 1.13.7
GO_REPO = https://github.com/golang/go/archive/go$(GO_VERSION).tar.gz
GO_PATCH = adapt-golang-to-occlum.patch

.ONESHELL: prepare override_dh_install

%:
	dh $@

# All rules executed in one shell
prepare:
	rm -rf $(tmp_build_dir)
	rm -rf $(install_dir)
	mkdir -p $(tmp_build_dir)
	cd $(tmp_build_dir)
	wget $(GO_REPO)
	tar -xvzf go$(GO_VERSION).tar.gz
	cd go-go$(GO_VERSION)
	patch -p1 < $(deb_build_dir)/$(name)/debian/$(GO_PATCH)

override_dh_auto_build: prepare
	cd $(tmp_build_dir)/go-go$(GO_VERSION)/src; \
		export GO_LDFLAGS="-compressdwarf=false"; \
		./make.bash

override_dh_install:
	mkdir -p $(buildroot)/opt/occlum/toolchains
	mv $(tmp_build_dir)/go-go$(GO_VERSION)/ $(install_dir)
	rm -rf $(install_dir)/.git*
	cat > $(install_dir)/bin/occlum-go <<EOF
		#!/bin/bash
		OCCLUM_GCC="\$$(which occlum-gcc)"
		OCCLUM_GOFLAGS="-buildmode=pie \$$GOFLAGS"
		CC=\$$OCCLUM_GCC GOFLAGS=\$$OCCLUM_GOFLAGS /opt/occlum/toolchains/golang/bin/go "\$$@"
	EOF
	chmod +x $(install_dir)/bin/occlum-go

	mkdir -p $(buildroot)/etc/profile.d
	cp $(deb_build_dir)/$(name)/debian/occlum-go.sh $(buildroot)/etc/profile.d
	chmod 644 $(buildroot)/etc/profile.d/occlum-go.sh

clean:
	dh_clean
	rm -f $(buildroot)

# Skip stripping
override_dh_strip_nondeterminism:
override_dh_strip:
override_dh_shlibdeps:
	echo "skip ..."