# Copyright 1999-2017 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

EAPI="4"

AT_M4DIR="config"
AUTOTOOLS_AUTORECONF="1"
AUTOTOOLS_IN_SOURCE_BUILD="1"

inherit bash-completion-r1 flag-o-matic linux-info linux-mod toolchain-funcs autotools-utils

if [ ${PV} == "9999" ] ; then
	inherit git-2
	MY_PV=9999
	EGIT_REPO_URI="https://github.com/zfsonlinux/zfs.git"
else
	inherit eutils versionator
	MY_PV=$(replace_version_separator 3 '-')
	SRC_URI="https://github.com/zfsonlinux/zfs/archive/zfs-${MY_PV}.tar.gz"
	S="${WORKDIR}/zfs-zfs-${MY_PV}"
	KEYWORDS="~amd64 ~arm ~ppc ~ppc64"
fi

DESCRIPTION="Linux ZFS kernel module for sys-fs/zfs"
HOMEPAGE="http://zfsonlinux.org/"

LICENSE="CDDL debug? ( GPL-2+ )"
SLOT="0"
IUSE="custom-cflags debug +rootfs"
RESTRICT="test"

DEPEND="
	=sys-kernel/spl-${PV}*
	dev-lang/perl
	virtual/awk
"

RDEPEND="${DEPEND}
	!sys-fs/zfs-fuse
"

pkg_setup() {
	linux-info_pkg_setup
	CONFIG_CHECK="!DEBUG_LOCK_ALLOC
		BLK_DEV_LOOP
		EFI_PARTITION
		IOSCHED_NOOP
		MODULES
		!PAX_KERNEXEC_PLUGIN_METHOD_OR
		ZLIB_DEFLATE
		ZLIB_INFLATE
	"

	use rootfs && \
		CONFIG_CHECK="${CONFIG_CHECK} BLK_DEV_INITRD
			DEVTMPFS"

	kernel_is ge 2 6 26 || die "Linux 2.6.26 or newer required"

	[ ${PV} != "9999" ] && \
		{ kernel_is le 3 9 || die "Linux 3.9 is the latest supported version."; }

	check_extra_config
}

src_prepare() {
	if [ ${PV} != "9999" ]
	then
		# Cast constant for 32-bit compatibility
		epatch "${FILESDIR}/${P}-cast-const-for-32bit-compatibility.patch"

		# Handle missing name length check in Linux VFS
		epatch "${FILESDIR}/${P}-vfs-name-length-compatibility.patch"

		# Fix NULL pointer exception on hardened kernels, bug #457176
		epatch "${FILESDIR}/${P}-improved-hardened-support.patch"

		# Fix barrier regression on Linux 2.6.37 and later
		epatch "${FILESDIR}/${P}-flush-properly.patch"

		# Improve accuracy of autotools checks
		epatch "${FILESDIR}/${P}-improved-autotools-checks.patch"

		# Linux 3.9 Support
		epatch "${FILESDIR}/${P}-linux-3.9-compat.patch"

		# Do not second guess Linux's memory management
		epatch "${FILESDIR}/${P}-zfs_arc_memory_throttle_disable.patch"
	fi

	# Remove GPLv2-licensed ZPIOS unless we are debugging
	use debug || sed -e 's/^subdir-m += zpios$//' -i "${S}/module/Makefile.in"

	autotools-utils_src_prepare
}

src_configure() {
	use custom-cflags || strip-flags
	filter-ldflags -Wl,*

	set_arch_to_kernel
	local myeconfargs=(
		--bindir="${EPREFIX}/bin"
		--sbindir="${EPREFIX}/sbin"
		--with-config=kernel
		--with-linux="${KV_DIR}"
		--with-linux-obj="${KV_OUT_DIR}"
		$(use_enable debug)
	)
	autotools-utils_src_configure
}

src_install() {
	autotools-utils_src_install
	dodoc AUTHORS COPYRIGHT DISCLAIMER README.markdown

	# Provide /usr/src/zfs symlink for lustre
	dosym "$(basename $(echo "${ED}/usr/src/zfs-"*))/${KV_FULL}" /usr/src/zfs
}

pkg_postinst() {
	linux-mod_pkg_postinst

	if use x86 || use arm
	then
		ewarn "32-bit kernels will likely require increasing vmalloc to"
		ewarn "at least 256M and decreasing zfs_arc_max to some value less than that."
	fi

	ewarn "This version of ZFSOnLinux introduces support for features flags."
	ewarn "If you upgrade your pools to make use of feature flags, you will lose"
	ewarn "the ability to import them using older versions of ZFSOnLinux."
	ewarn "Any new pools will be created with feature flag support and will"
	ewarn "not be compatible with older versions of ZFSOnLinux. To create a new"
	ewarn "pool that is backward compatible, use zpool create -o version=28 ..."
}