# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

inherit eutils linux-mod linux-info

DESCRIPTION="Free open-source disk encryption software for Windows XP/2000/2003 and Linux"
HOMEPAGE="http://www.truecrypt.org/"
SRC_URI="http://www.truecrypt.org/downloads/truecrypt-${PV}-source-code.tar.gz"

LICENSE="truecrypt"
SLOT="0"
KEYWORDS="~x86 ~amd64"
IUSE=""

DEPEND="virtual/linux-sources
	>=sys-fs/device-mapper-1.00.08"

RDEPEND="sys-apps/module-init-tools
	>=sys-fs/device-mapper-1.00.08"

BUILD_PARAMS="KSRC=${KV_DIR} NO_WARNINGS=1"
BUILD_TARGETS="truecrypt"
MODULE_NAMES="truecrypt(extra:${S}/Linux/Kernel)"

pkg_setup() {
	linux-info_pkg_setup
	dmcrypt_check;
}

src_unpack() {
	unpack ${A}
	cd ${S}
	linux-mod_pkg_setup
}

src_compile() {
	linux-mod_src_compile || die "Truecrypt module compilation failed."
	cd ${S}/Linux/Cli
	einfo "Building truecrypt utility"
	# Make the CLI -- the build breaks if built in parallel, so use -j1 for
	# MAKEOPTS
	emake -j1 || die "Compile and/or linking of TrueCrypt Linux CLI application failed."
}

src_test() {
	${S}/Linux/Cli/truecrypt --test
}

src_install() {
	# unload truecrypt modules if already loaded
	/sbin/rmmod truecrypt >&- 2>&-
	if grep -q "^truecrypt" /proc/modules
	then 
		die "Please dismount all mounted TrueCrypt volumes"
	fi
	
	cd ${S}
	# installing files	
	dobin Linux/Cli/truecrypt
	doman Linux/Cli/Man/truecrypt.1
	dodoc Readme.txt

	# installing kernel module
	linux-mod_src_install
}

pkg_postinst() {
	depmod || die "depmod failed"
	
	echo
	einfo " For TrueCrypt 4.2 to work you have to load a "
	einfo " kernel module. This can be done in three ways: "
	einfo 
	einfo " 1. Loading the module automatically by the running kernel. "
	einfo "    For this 'Automatic kernel module loading' needs to be "
	einfo "    enabled (CONFIG_KMOD=y). "
	einfo " 2. Loading the module manually before mounting the volume. "
	einfo "    Try 'modprobe truecrypt' as root to load the module. "
	einfo " 3. Load the module during boot by listing it in "
	einfo "    '/etc/modules.autoload.d/kernel-2.6' "
}

dmcrypt_check() {
	ebegin "Checking for Device mapper support (BLK_DEV_DM)"
	linux_chkconfig_present BLK_DEV_DM
	eend $?

	if [[ $? -ne 0 ]] ; then
		ewarn "TrueCrypt requires Device mapper support!"
		ewarn "Please enable Device mapper support in your kernel config, found at:"
		ewarn "(for 2.6 kernels)"
		ewarn
		ewarn "  Device Drivers"
		ewarn "    Multi-Device Support"
		ewarn "      <*> Device mapper support"
		ewarn
		ewarn "and recompile your kernel if you want this package to work."
		epause 10
	fi
}