# Copyright 1999-2016 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

EAPI=5

AUTOTOOLS_AUTORECONF=yes
AUTOTOOLS_IN_SOURCE_BUILD=yes

inherit git-r3 autotools-utils flag-o-matic systemd toolchain-funcs

KEYWORDS=""

EGIT_REPO_URI="https://github.com/coreos/rkt.git"
PXE_VERSION="794.1.0"
PXE_SYSTEMD_VERSION="v222"
KVM_LINUX_VERSION="4.3.1"
KVMTOOL_VERSION="3c8aec9e2b5066412390559629dabeb7816ee8f2"
PXE_URI="http://alpha.release.core-os.net/amd64-usr/${PXE_VERSION}/coreos_production_pxe_image.cpio.gz"
PXE_FILE="${PN}-pxe-${PXE_VERSION}.img"

[[ ${PV} == *9999* ]] || SRC_URI+=" https://github.com/coreos/${PN}/archive/v${PV}.tar.gz -> ${P}.tar.gz"
SRC_URI+="
rkt_stage1_coreos? ( $PXE_URI -> $PXE_FILE )
rkt_stage1_kvm? (
	https://kernel.googlesource.com/pub/scm/linux/kernel/git/will/kvmtool/+archive/${KVMTOOL_VERSION}.tar.gz -> kvmtool-${KVMTOOL_VERSION}.tar.gz
	mirror://kernel/linux/kernel/v4.x/linux-${KVM_LINUX_VERSION}.tar.xz
	${PXE_URI} -> ${PXE_FILE}
)
rkt_stage1_src? ( https://github.com/systemd/systemd/archive/${PXE_SYSTEMD_VERSION}.tar.gz -> systemd-${PXE_SYSTEMD_VERSION#v}.tar.gz )"

DESCRIPTION="A CLI for running app containers, and an implementation of the App
Container Spec."
HOMEPAGE="https://github.com/coreos/rkt"

LICENSE="Apache-2.0"
SLOT="0"
IUSE="doc examples +rkt_stage1_coreos +rkt_stage1_fly rkt_stage1_host rkt_stage1_kvm rkt_stage1_src +actool systemd"
REQUIRED_USE="|| ( rkt_stage1_coreos rkt_stage1_fly rkt_stage1_host rkt_stage1_kvm rkt_stage1_src ) rkt_stage1_host? ( systemd )"

DEPEND=">=dev-lang/go-1.4.1
	app-arch/cpio
	app-crypt/trousers
	sys-fs/squashfs-tools
	dev-perl/Capture-Tiny"

RDEPEND="!app-emulation/rocket
	rkt_stage1_host? ( systemd? (
		>=sys-apps/systemd-222
		app-shells/bash:0
	) )"

BUILDDIR="build-${P}"
STAGE1_DEFAULT_LOCATION="/usr/share/rkt/stage1.aci"

src_unpack() {
	[[ ${PV} == *9999* ]] && git-r3_src_unpack
	local x
	for x in ${A}; do
		case ${x} in
			*.img|linux-*) continue ;;
			kvmtool-*)
				mkdir kvmtool || die
				pushd kvmtool >/dev/null || die
				unpack ${x}
				popd >/dev/null || die
				;;
			*)
				unpack ${x}
		esac
	done
}

src_prepare() {
	# disable git fetch of systemd
	sed -e 's~^include makelib/git.mk$~'\
'ifneq ($(wildcard $(RKT_STAGE1_SYSTEMD_SRC)),)\n\n'\
'get_systemd_sources: | $(UFS_SYSTEMDDIR)\n'\
'\tmv "$(RKT_STAGE1_SYSTEMD_SRC)" "$(UFS_SYSTEMD_SRCDIR)"\n\n'\
'$(UFS_SYSTEMD_CONFIGURE): get_systemd_sources\n\n'\
'else ifneq ($(wildcard $(UFS_SYSTEMD_SRCDIR)),)\n\n'\
'else\n'\
'\t\0\n'\
'endif~' -i stage1/usr_from_src/usr_from_src.mk || die

	# disable git fetch of kvmtool
	sed -e 's~^include makelib/git.mk$~'\
'ifneq ($(wildcard $(shell echo "$${WORKDIR}/kvmtool")),)\n\n'\
'$(call forward-vars, get_lkvm_sources, LKVM_SRCDIR)\n'\
'get_lkvm_sources: | $(LKVM_TMPDIR)\n'\
'\tmv "$${WORKDIR}/kvmtool" "$(LKVM_SRCDIR)"\n\n'\
'$(LKVM_PATCH_STAMP): get_lkvm_sources\n\n'\
'else ifneq ($(wildcard $(LKVM_SRCDIR)),)\n\n'\
'else\n'\
'\t\0\n'\
'endif~' -i stage1/usr_from_kvm/lkvm.mk || die

	# disable fetch of kernel sources
	sed -e 's|wget .*|ln -s "$${DISTDIR}/linux-'${KVM_LINUX_VERSION}'.tar.xz" "$@"|' \
		-i stage1/usr_from_kvm/kernel.mk || die

	if use rkt_stage1_host; then
		# Make systemdUnitsPath consistent with host
		sed -e 's|\(systemdUnitsPath := \).*|\1"'$(systemd_get_systemunitdir)'"|' \
			-i stage1/init/init.go || die
	fi

	autotools-utils_src_prepare
}

src_configure() {
	local flavors myeconfargs=(
		--with-stage1-default-images-directory="/usr/share/rkt"
		--with-stage1-default-location="${STAGE1_DEFAULT_LOCATION}"
	)

	# enable flavors (first is default)
	use rkt_stage1_host && flavors+=",host"
	use rkt_stage1_src && flavors+=",src"
	use rkt_stage1_coreos && flavors+=",coreos"
	use rkt_stage1_fly && flavors+=",fly"
	use rkt_stage1_kvm && flavors+=",kvm"
	myeconfargs+=( --with-stage1-flavors="${flavors#,}" )

	if use rkt_stage1_src; then
		myeconfargs+=(
			--with-stage1-systemd-version=${PXE_SYSTEMD_VERSION}
			--with-stage1-systemd-src="${WORKDIR}/systemd-${PXE_SYSTEMD_VERSION#v}"
		)
	fi

	if use rkt_stage1_coreos || use rkt_stage1_kvm; then
		myeconfargs+=(
			--with-coreos-local-pxe-image-path="${DISTDIR}/${PXE_FILE}"
			--with-coreos-local-pxe-image-systemd-version="${PXE_SYSTEMD_VERSION}"
		)
	fi

	# Go's 6l linker does not support PIE, disable so cgo binaries
	# which use 6l+gcc for linking can be built correctly.
	if gcc-specs-pie; then
		append-ldflags -nopie
	fi

	export CC=$(tc-getCC)
	export CGO_ENABLED=1
	export CGO_CFLAGS="${CFLAGS}"
	export CGO_CPPFLAGS="${CPPFLAGS}"
	export CGO_CXXFLAGS="${CXXFLAGS}"
	export CGO_LDFLAGS="${LDFLAGS}"
	export BUILDDIR

	autotools-utils_src_configure
}

src_compile() {
	local arch=${ARCH}
	case ${arch} in
		amd64) arch=x86_64;;
	esac
	ARCH=${arch} autotools-utils_src_compile
}

src_install() {
	dodoc README.md
	use doc && dodoc -r Documentation
	use examples && dodoc -r examples
	use actool && dobin "${S}/${BUILDDIR}/bin/actool"

	dobin "${S}/${BUILDDIR}/bin/rkt"

	insinto /usr/share/rkt
	doins "${S}/${BUILDDIR}/bin/"*.aci

	# create symlink for default stage1 image path
	if use rkt_stage1_host; then
		dosym stage1-host.aci "${STAGE1_DEFAULT_LOCATION}"
	elif use rkt_stage1_src; then
		dosym stage1-src.aci "${STAGE1_DEFAULT_LOCATION}"
	elif use rkt_stage1_coreos; then
		dosym stage1-coreos.aci "${STAGE1_DEFAULT_LOCATION}"
	elif use rkt_stage1_fly; then
		dosym stage1-fly.aci "${STAGE1_DEFAULT_LOCATION}"
	elif use rkt_stage1_kvm; then
		dosym stage1-kvm.aci "${STAGE1_DEFAULT_LOCATION}"
	fi

	systemd_dounit "${S}"/dist/init/systemd/${PN}-gc.service
	systemd_dounit "${S}"/dist/init/systemd/${PN}-gc.timer
	systemd_dounit "${S}"/dist/init/systemd/${PN}-metadata.service
	systemd_dounit "${S}"/dist/init/systemd/${PN}-metadata.socket
}