# Contributor: Sören Tempel <soeren+alpine@soeren-tempel.net>
# Maintainer: Eivind Uggedal <eivind@uggedal.com>
pkgname=go
pkgver=1.8.1
# This should be the latest commit on the corresponding release branch
_toolsver="5682db0e919ed9cfc6f52ac32e170511a106eb3b"
pkgrel=1
pkgdesc="Go programming language compiler"
url="http://www.golang.org/"
arch="all"
license="BSD"
depends="binutils gcc"
depends_dev=""
makedepends="bash go-bootstrap"
options="!strip"
provides="go-bootstrap=$pkgver-r$pkgrel"
install=""
subpackages="$pkgname-doc"
source="http://golang.org/dl/go${pkgver/_/}.src.tar.gz
	go-tools-${pkgver/_/}.tar.gz::https://github.com/golang/tools/archive/${_toolsver}.tar.gz
	default-buildmode-pie.patch
	set-external-linker.patch
	"

# NOTE: building go for x86 with grsec kernel requires:
#           sysctl -w kernel.modify_ldt=1

if [ "$CBUILD" = "$CTARGET" ]; then
	makedepends="go-bootstrap $makedepends"
	provides="go-bootstrap=$pkgver-r$pkgrel"
	subpackages="$subpackages $pkgname-tools"
	_gotools="cover godoc stringer"
	_gocross="darwin freebsd openbsd windows"
else
	pkgname="go-bootstrap"
	makedepends="go $makedepends"
	# Go expect host linker instead of the cross-compiler
	export CC_FOR_TARGET="$CC"
	export CC="${HOSTLD:-gcc}"
	export CXX="${HOSTLD:-g++}"
	export LD="${HOSTLD:-ld}"
fi

_tooldir="$srcdir"/tools-${_toolsver}
for os in $_gocross; do
	subpackages="$subpackages $pkgname-cross-${os}:_crosspkg"
done

builddir="$srcdir"/go
build() {
	cd "$builddir/src"

	case "$CTARGET_ARCH" in
	aarch64)export GOARCH="arm64" ;;
	armhf)  export GOARCH="arm" GOARM=6 ;;
	armv7)  export GOARCH="arm" GOARM=7 ;;
	s390x)  export GOARCH="s390x" ;;
	x86)    export GOARCH="386" GO386=387 ;;
	x86_64) export GOARCH="amd64" ;;
	ppc64le) export GOARCH="ppc64le" ;;
	*)      die "Unsupported arch" ;;
	esac

	export GOOS="linux"
	export GOPATH="$srcdir"
	export GOROOT="$builddir"
	export GOBIN="$GOROOT"/bin
	export GOROOT_FINAL=/usr/lib/go
	local p; for p in /usr/lib/go-bootstrap /usr/lib/go-linux-$GOARCH-bootstrap /usr/lib/go; do
		if [ -d "$p" ]; then
			export GOROOT_BOOTSTRAP="$p"
			break
		fi
	done

	./make.bash
	for os in $_gocross; do
                local hostarch="$GOARCH"
		for arch in "386" "amd64"; do
			GOHOSTARCH=$hostarch GOARCH=$arch GOOS=$os ./make.bash
		done
	done

	# copied from bootstrap.bash to fixup cross-built bootstrap go
	if [ "$CBUILD" != "$CTARGET" ]; then
		local gohostos="$(../bin/go env GOHOSTOS)"
		local gohostarch="$(../bin/go env GOHOSTARCH)"
		mv ../bin/*_*/* ../bin
		rmdir ../bin/*_*
		rm -rf "../pkg/${gohostos}_${gohostarch}"* "../pkg/tool/${gohostos}_${gohostarch}"*
		rm -rf ../pkg/bootstrap ../pkg/obj
	fi

	# FIXME some tests fail:
	# PATH="$GOROOT/bin:$PATH" ./run.bash -no-rebuild || return 1

	mkdir -p "$GOPATH"/src/golang.org/x/tools
	cp -r "$_tooldir"/* "$GOPATH"/src/golang.org/x/tools

	for tool in $_gotools; do
		"$GOROOT"/bin/go install \
			golang.org/x/tools/cmd/$tool || return 1
	done
}

package() {
	cd "$builddir"
	mkdir -p "$pkgdir"/usr/bin "$pkgdir"/usr/lib/go/bin "$pkgdir"/usr/share/doc/go

	for binary in go gofmt; do
		mv bin/"$binary" "$pkgdir"/usr/lib/go/bin/ || return 1
		ln -s /usr/lib/go/bin/"$binary" "$pkgdir"/usr/bin/ || return 1
	done

	# The source needs to be installed due to an upstream
	# bug (https://github.com/golang/go/issues/2775).
	# When this is resolved we can split out the source to a
	# go-src sub package.
	cp -a pkg src lib "$pkgdir"/usr/lib/go || return 1
	cp -r doc misc "$pkgdir"/usr/share/doc/go || return 1

	# Remove tests from /usr/lib/go/src.
	# Those shouldn't be affacted by the upstream bug (see above).
	find "$pkgdir"/usr/lib/go/src \( -type f -a -name "*_test.go" \) \
		-exec rm -rf \{\} \+ || return 1
	find "$pkgdir"/usr/lib/go/src \( -type d -a -name "testdata" \) \
		-exec rm -rf \{\} \+ || return 1
	find "$pkgdir"/usr/lib/go/src -type f -a \( -name "*.bash" -o -name "*.rc" -o -name "*.bat" \) \
		-exec rm -rf \{\} \+ || return 1

	rm -rf "$pkgdir"/usr/lib/go/pkg/bootstrap
	rm -f  "$pkgdir"/usr/lib/go/pkg/tool/*/api
}

tools() {
	pkgdesc="Go programming language tools"
	depends="$pkgname"

	mkdir -p "$subpkgdir"/usr/bin "$subpkgdir"/usr/lib/go/bin
	for binary in "$builddir"/bin/*; do
		mv $binary "$subpkgdir"/usr/lib/go/bin || return 1
		ln -s /usr/lib/go/bin/"${binary##*/}" "$subpkgdir"/usr/bin/ || return 1
	done

	mkdir -p "$subpkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH
	cp "$subpkgdir"/usr/lib/go/bin/godoc \
		"$pkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/godoc || return 1

	for tool in $_gotools; do
		[ -f "$pkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool ] \
			|| continue

		mv "$pkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool \
			"$subpkgdir"/usr/lib/go/pkg/tool/linux_$GOARCH/$tool || return 1
	done
}

_crosspkg() {
	local name="$(echo "${subpkgname}" | cut -d '-' -f3)"
	pkgdesc="Go cross compiler for $name"
	depends="$pkgname"

	mkdir -p "$subpkgdir"/usr/lib/go/pkg/tool/
	mv "$pkgdir"/usr/lib/go/pkg/tool/${name}_* \
		"$subpkgdir"/usr/lib/go/pkg/tool/ || return 1
	mv "$pkgdir"/usr/lib/go/pkg/${name}_* \
		"$subpkgdir"/usr/lib/go/pkg/ || return 1
}

sha512sums="f01fe7b35ac23101610f6fc169b88dafe2edc49b3b044d5d0aff771b05dcb2c8d2e7a5090ed6dbe67f861e78e792ace32e209ed464399ca02dcd186b13ec8037  go1.8.1.src.tar.gz
343fca47f250278b22df1c1cd92cce91e01009043d05d8ccce095e4386fa0f5ca8ccaa58232635332c7288ceca9d2a240f774f8bb3b08129a681a582cba60248  go-tools-1.8.1.tar.gz
13cd386c38875b951da4057586007f3c67503dc79ddf57befbf763af85ec2cd2a2e6b00614450c179c93f1f8747ee7456ee412adccd08a5f115b33812598a148  default-buildmode-pie.patch
6b36f3780ab10e5c4902473a8ab5c0417220ece584b537517e9e60979bdc5a548ed14dd2546605392c89ec5ea6691769d337d34e2e19b92eba5bbca1898f4ada  set-external-linker.patch"