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# Copyright 1999-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=7

export CBUILD=${CBUILD:-${CHOST}}
export CTARGET=${CTARGET:-${CHOST}}

MY_PV=${PV/_/}

inherit toolchain-funcs

case ${PV}  in
*9999*)
	EGIT_REPO_URI="https://github.com/golang/go.git"
	inherit git-r3
	;;
*)
	SRC_URI="https://storage.googleapis.com/golang/go${MY_PV}.src.tar.gz "
	S="${WORKDIR}"/go
	case ${PV} in
	*_beta*|*_rc*) ;;
	*)
		KEYWORDS="-* ~amd64 ~arm ~arm64 ~ppc64 ~s390 x86 ~amd64-linux ~x86-linux ~x64-macos ~x64-solaris"
		;;
	esac
esac

DESCRIPTION="A concurrent garbage collected and typesafe programming language"
HOMEPAGE="https://golang.org"

LICENSE="BSD"
SLOT="0/${PV}"

BDEPEND="|| (
		dev-lang/go
		dev-lang/go-bootstrap )"
RDEPEND="!<dev-go/go-tools-0_pre20150902"

# Do not complain about CFLAGS, etc, since Go doesn't use them.
QA_FLAGS_IGNORED='.*'

# The tools in /usr/lib/go should not cause the multilib-strict check to fail.
QA_MULTILIB_PATHS="usr/lib/go/pkg/tool/.*/.*"

# Do not strip this package. Stripping is unsupported upstream and may
# fail.
RESTRICT+=" strip"

DOCS=(
AUTHORS
CONTRIBUTING.md
CONTRIBUTORS
PATENTS
README.md
)

go_arch()
{
	# By chance most portage arch names match Go
	local portage_arch=$(tc-arch $@)
	case "${portage_arch}" in
		x86)	echo 386;;
		x64-*)	echo amd64;;
		ppc64) [[ $(tc-endian $@) = big ]] && echo ppc64 || echo ppc64le ;;
		s390) echo s390x ;;
		*)		echo "${portage_arch}";;
	esac
}

go_arm()
{
	case "${1:-${CHOST}}" in
		armv5*)	echo 5;;
		armv6*)	echo 6;;
		armv7*)	echo 7;;
		*)
			die "unknown GOARM for ${1:-${CHOST}}"
			;;
	esac
}

go_os()
{
	case "${1:-${CHOST}}" in
		*-linux*)	echo linux;;
		*-darwin*)	echo darwin;;
		*-freebsd*)	echo freebsd;;
		*-netbsd*)	echo netbsd;;
		*-openbsd*)	echo openbsd;;
		*-solaris*)	echo solaris;;
		*-cygwin*|*-interix*|*-winnt*)
			echo windows
			;;
		*)
			die "unknown GOOS for ${1:-${CHOST}}"
			;;
	esac
}

go_tuple()
{
	echo "$(go_os $@)_$(go_arch $@)"
}

go_cross_compile()
{
	[[ $(go_tuple ${CBUILD}) != $(go_tuple) ]]
}

src_compile()
{
	if has_version -b dev-lang/go; then
		export GOROOT_BOOTSTRAP="${BROOT}/usr/lib/go"
	elif has_version -b dev-lang/go-bootstrap; then
		export GOROOT_BOOTSTRAP="${BROOT}/usr/lib/go-bootstrap"
	else
		eerror "Go cannot be built without go or go-bootstrap installed"
		die "Should not be here, please report a bug"
	fi

	export GOROOT_FINAL="${EPREFIX}"/usr/lib/go
	export GOROOT="$(pwd)"
	export GOBIN="${GOROOT}/bin"

	# Go's build script does not use BUILD/HOST/TARGET consistently. :(
	export GOHOSTARCH=$(go_arch ${CBUILD})
	export GOHOSTOS=$(go_os ${CBUILD})
	export CC=$(tc-getBUILD_CC)

	export GOARCH=$(go_arch)
	export GOOS=$(go_os)
	export CC_FOR_TARGET=$(tc-getCC)
	export CXX_FOR_TARGET=$(tc-getCXX)
	if [[ ${ARCH} == arm ]]; then
		export GOARM=$(go_arm)
	fi

	cd src
	bash -x ./make.bash || die "build failed"
}

src_test()
{
	go_cross_compile && return 0

	cd src
	PATH="${GOBIN}:${PATH}" \
	./run.bash -no-rebuild || die "tests failed"
	cd ..
	rm -fr pkg/*_race || die
	rm -fr pkg/obj/go-build || die
}

src_install()
{
	local bin_path f x

	dodir /usr/lib/go

	# There is a known issue which requires the source tree to be installed [1].
	# Once this is fixed, we can consider using the doc use flag to control
	# installing the doc and src directories.
	# [1] https://golang.org/issue/2775
	#
	# deliberately use cp to retain permissions
	cp -R api bin doc lib pkg misc src test "${ED}"/usr/lib/go
	# testdata directories are not needed on the installed system
	rm -fr $(find "${ED}"/usr/lib/go -iname testdata -type d -print)
	if go_cross_compile; then
		bin_path="bin/$(go_tuple)"
	else
		bin_path=bin
	fi
	for x in ${bin_path}/*; do
		f=${x##*/}
		dosym ../lib/go/${bin_path}/${f} /usr/bin/${f}
	done
	einstalldocs

	if [[ ${CHOST} == *-darwin* ]] ; then
		# fix install_name for test object (binutils_test) on Darwin, it
		# is never used in real circumstances
		local libmac64="${EPREFIX}"/usr/lib/go/src/cmd/vendor/github.com/
		      libmac64+=google/pprof/internal/binutils/testdata/lib_mac_64
		install_name_tool -id "${libmac64}" "${D}${libmac64}"
	fi
}

pkg_postinst() {
	[[ -z ${REPLACING_VERSIONS} ]] && return
	has_version "<sys-apps/portage-3.0.9" && return

	einfo "After ${CATEGORY}/${PN} is updated it is recommended to rebuild"
	einfo "all packages compiled with previous versions of ${CATEGORY}/${PN}"
	einfo "due to the static linking nature of go."
	einfo "If this is not done, the packages compiled with the older"
	einfo "version of the compiler will not be updated until they are"
	einfo "updated individually, which could mean they will have"
	einfo "vulnerabilities."
	einfo "Run 'emerge @golang-rebuild' to rebuild all 'go' packages"
	einfo "See https://bugs.gentoo.org/752153 for more info"
}