# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-kernel/dracut/dracut-018.ebuild,v 1.2 2012/04/26 06:30:45 aidecoe Exp $

EAPI=4

inherit eutils linux-info

add_req_use_for() {
	local dep="$1"; shift
	local f

	for f in "$@"; do
		REQUIRED_USE+="${f}? ( ${dep} )
"
	done
}

DESCRIPTION="Generic initramfs generation tool"
HOMEPAGE="http://dracut.wiki.kernel.org"
SRC_URI="mirror://kernel/linux/utils/boot/${PN}/${P}.tar.bz2"
LICENSE="GPL-2"
SLOT="0"
KEYWORDS="~amd64 ~x86"

REQUIRED_USE="dracut_modules_crypt-gpg? ( dracut_modules_crypt )
	dracut_modules_livenet? ( dracut_modules_dmsquash-live )
	"
COMMON_MODULES="
	dracut_modules_biosdevname
	dracut_modules_btrfs
	dracut_modules_caps
	dracut_modules_crypt-gpg
	dracut_modules_gensplash
	dracut_modules_mdraid
	dracut_modules_multipath
	dracut_modules_plymouth
	dracut_modules_syslog
	"
DM_MODULES="
	dracut_modules_crypt
	dracut_modules_dmraid
	dracut_modules_dmsquash-live
	dracut_modules_livenet
	dracut_modules_lvm
	"
NETWORK_MODULES="
	dracut_modules_iscsi
	dracut_modules_livenet
	dracut_modules_nbd
	dracut_modules_nfs
	dracut_modules_ssh-client
	"
add_req_use_for device-mapper ${DM_MODULES}
add_req_use_for net ${NETWORK_MODULES}
IUSE_DRACUT_MODULES="${COMMON_MODULES} ${DM_MODULES} ${NETWORK_MODULES}"
IUSE="debug device-mapper net selinux ${IUSE_DRACUT_MODULES}"

RESTRICT="test"

RDEPEND="
	>=app-shells/bash-4.0
	>=app-shells/dash-0.5.4.11
	>=sys-apps/baselayout-1.12.14-r1
	>=sys-apps/sysvinit-2.87-r3
	>=sys-apps/util-linux-2.20
	>=sys-fs/udev-164
	app-arch/cpio
	|| ( >=sys-apps/module-init-tools-3.8 >sys-apps/kmod-5[tools] )

	debug? ( dev-util/strace )
	device-mapper? ( || ( sys-fs/device-mapper >=sys-fs/lvm2-2.02.33 ) )
	net? ( net-misc/curl >=net-misc/dhcp-4.2.1-r1 sys-apps/iproute2 )
	selinux? ( sys-libs/libselinux sys-libs/libsepol )
	dracut_modules_biosdevname? ( sys-apps/biosdevname )
	dracut_modules_btrfs? ( sys-fs/btrfs-progs )
	dracut_modules_caps? ( sys-libs/libcap )
	dracut_modules_crypt? ( sys-fs/cryptsetup )
	dracut_modules_crypt-gpg? ( app-crypt/gnupg )
	dracut_modules_dmraid? ( sys-fs/dmraid sys-fs/multipath-tools )
	dracut_modules_gensplash? ( media-gfx/splashutils )
	dracut_modules_iscsi? ( >=sys-block/open-iscsi-2.0.871.3 )
	dracut_modules_lvm? ( >=sys-fs/lvm2-2.02.33 )
	dracut_modules_mdraid? ( sys-fs/mdadm )
	dracut_modules_multipath? ( sys-fs/multipath-tools )
	dracut_modules_nbd? ( sys-block/nbd )
	dracut_modules_nfs? ( net-fs/nfs-utils net-nds/rpcbind )
	dracut_modules_plymouth? ( >=sys-boot/plymouth-0.8.3-r1 )
	dracut_modules_ssh-client? ( dev-libs/openssl )
	dracut_modules_syslog? ( || ( app-admin/syslog-ng app-admin/rsyslog ) )
	"
DEPEND=""

#
# Helper functions
#

# Returns true if any of specified modules is enabled by USE flag and false
# otherwise.
# $1 = list of modules (which have corresponding USE flags of the same name)
any_module() {
	local m modules=" $@ "

	for m in ${modules}; do
		! use $m && modules=${modules/ $m / }
	done

	shopt -s extglob
	modules=${modules%%+( )}
	shopt -u extglob

	[[ ${modules} ]]
}

# Removes module from modules.d.
# $1 = module name
# Module name can be specified without number prefix.
rm_module() {
	local force m
	[[ $1 = -f ]] && force=-f

	for m in $@; do
		if [[ $m =~ ^[0-9][0-9][^\ ]*$ ]]; then
			rm ${force} --interactive=never -r "${modules_dir}"/$m
		else
			rm ${force} --interactive=never -r "${modules_dir}"/[0-9][0-9]$m
		fi
	done
}

# Displays Gentoo Base System major release number
base_sys_maj_ver() {
	local line

	read line < /etc/gentoo-release
	line=${line##* }
	echo "${line%%.*}"
}

#
# ebuild functions
#

src_prepare() {
	epatch "${FILESDIR}/${P}-multipath-udev-rules.patch"
}

src_compile() {
	return
}

src_install() {
	emake prefix=/usr sysconfdir=/etc DESTDIR="${D}" install

	local gen2conf

	dodir /var/lib/dracut/overlay
	dodoc HACKING TODO AUTHORS NEWS README*

	case "$(base_sys_maj_ver)" in
		1) gen2conf=gentoo.conf ;;
		2) gen2conf=gentoo-openrc.conf ;;
		*) die "Expected ver. 1 or 2 of Gentoo Base System (/etc/gentoo-release)."
	esac

	insinto /etc/dracut.conf.d
	newins dracut.conf.d/${gen2conf}.example ${gen2conf}

	insinto /etc/logrotate.d
	newins dracut.logrotate dracut

	dohtml dracut.html

	#
	# Modules
	#
	local module
	modules_dir="${D}/usr/lib/dracut/modules.d"

	echo "${PF}" > "${modules_dir}"/10rpmversion/dracut-version \
		|| die 'dracut-version failed'

	# Remove modules not enabled by USE flags
	for module in ${IUSE_DRACUT_MODULES} ; do
		! use ${module} && rm_module -f ${module#dracut_modules_}
	done

	# Those flags are specific, and even are corresponding to modules, they need
	# to be declared as regular USE flags.
	use debug || rm_module 95debug
	use selinux || rm_module 98selinux

	# Following flags define set of helper modules which are base dependencies
	# for others and as so have no practical use, so remove these modules.
	use device-mapper  || rm_module 90dm
	use net || rm_module 40network 45ifcfg 45url-lib

	# Remove S/390 modules which are not tested at all
	rm_module 80cms 95dasd 95dasd_mod 95zfcp 95znet

	# Remove modules which won't work for sure
	rm_module 95fcoe # no tools
	# fips module depends on masked app-crypt/hmaccalc
	rm_module 01fips 02fips-aesni

	# Remove extra modules which go to future dracut-extras
	rm_module 00bootchart 05busybox 97masterkey 98ecryptfs 98integrity
}

pkg_postinst() {
	if linux-info_get_any_version && linux_config_src_exists; then
		echo
		ewarn "If the following test report contains a missing kernel"
		ewarn "configuration option, you should reconfigure and rebuild your"
		ewarn "kernel before booting image generated with this Dracut version."
		echo

		local CONFIG_CHECK="~BLK_DEV_INITRD ~DEVTMPFS ~MODULES"

		# Kernel configuration options descriptions:
		local desc_DEVTMPFS="Maintain a devtmpfs filesystem to mount at /dev"
		local desc_BLK_DEV_INITRD="Initial RAM filesystem and RAM disk "\
"(initramfs/initrd) support"
		local desc_MODULES="Enable loadable module support"

		local opt desc

		# Generate ERROR_* variables for check_extra_config.
		for opt in ${CONFIG_CHECK}; do
			opt=${opt#\~}
			desc=desc_${opt}
			eval "local ERROR_${opt}='CONFIG_${opt}: \"${!desc}\"" \
				"is missing and REQUIRED'"
		done

		check_extra_config
		echo
	else
		echo
		ewarn "Your kernel configuration couldn't be checked.  Do you have"
		ewarn "/usr/src/linux/.config file there?  Please check manually if"
		ewarn "following options are enabled:"
		ewarn ""
		ewarn "  CONFIG_BLK_DEV_INITRD"
		ewarn "  CONFIG_DEVTMPFS"
		ewarn "  CONFIG_MODULES"
		echo
	fi

	elog 'To generate the initramfs:'
	elog '    # mount /boot (if necessary)'
	elog '    # dracut "" <kernel-version>'
	elog ''
	elog 'For command line documentation see dracut.kernel(7).'
	elog ''
	elog 'Simple example to select root and resume partition:'
	elog '    root=/dev/sda1 resume=/dev/sda2'
	elog ''
	elog 'To include only dracut modules and kernel drivers for this system,'
	elog 'use the "-H" option.  Some modules need to be explicitly added with'
	elog '"-a" option even if required tools are installed.'
}