# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

DESCRIPTION="This is a meta ebuild that pulls in the packages and some config scripts/files for building the Gentoo Clustering Master node"
HOMEPAGE="http://git.overlays.gentoo.org/gitweb/"
SRC_URI=""

LICENSE="GPL-2"
SLOT="0"
KEYWORDS="amd64 ~x86"
IUSE="autoconfigure"

DEPEND=""
RDEPEND="net-nds/ldap-auth
	sys-boot/syslinux
	net-dns/dnsmasq
	net-misc/sipcalc
	net-fs/nfs-utils"

CONFPATH="/etc/gentoo"
CONFIG_FILE="cluster.conf"

gent_ip_config()
{
	CLUSTER_ETH_IP="$(sipcalc ${CLUSTER_ETH} | egrep 'Host address\W*-' | cut -d- -f2)"
	RANGE_START="$(sipcalc ${CLUSTER_ETH} | egrep 'Host address\W*-' | cut -d- -f2)"
	IPSTART="${RANGE_START%.*}.$(( ${RANGE_START##*.} +1 ))"
	IPSTOP="$(sipcalc ${CLUSTER_ETH} | egrep 'Usable range\W*-' | cut -d- -f3)"
	SUBNET="$(sipcalc ${CLUSTER_ETH} | egrep 'Network mask\W*-' | cut -d- -f2)"
	NETADDR="$(sipcalc ${CLUSTER_ETH} | egrep 'Network address' | cut -d- -f2)"
}

dnsmasq_conf()
{
	cat > ${ROOT}/etc/dnsmasq.conf <<-EOF	

	# Public interface
	except-interface=$ETH

	# Set up the local-only domain
	local=/${LOCALDOMAINNAME}/
	domain=$LOCALDOMAINNAME
	expand-hosts

	# Some netiquette:
	domain-needed
	bogus-priv
	
	# Send RFC-3397 DNS domain search DHCP option. WARNING: Your DHCP client
	# probably doesn't support this...... (option 119)
	dhcp-option=119,$LOCALDOMAINNAME
	# Domain DNS name
	dhcp-option=15,$LOCALDOMAINNAME

	enable-tftp
	tftp-root=${TFTPROOT}

	dhcp-authoritative
	
	### Node definitions, this could be in a separate file
	# Turn on the DHCP server, pass out addresses from $IPSTART to $IPSTOP
	# with subnet mask of $SUBNET with a 12-hour lease
	dhcp-range=nodes,$IPSTART,$IPSTOP,$SUBNET,12h

	# Override the default route supplied by dnsmasq, which assumes the
	# router is the same machine as the one running dnsmasq.
	dhcp-option=3,$CLUSTER_ETH_IP

	# This tells the clients the hostname and IP of the TFTP server
	dhcp-boot=${PXELINUX},$(hostname),$CLUSTER_ETH_IP

	# We are the authoritative DHCP server for this network
	dhcp-authoritative

	# address and root path of NFS server
	dhcp-option=17,$CLUSTER_ETH_IP:${NFSROOT}
	
	EOF
}

pxe_conf()
{
	PROFNAME="$(uname -m)_node"
	BOOTPATH="${NFSROOT##$TFTPROOT}"
	BOOTPATH="${BOOTPATH#/}/boot"

	mkdir -p ${TFTPROOT}/pxelinux.cfg

	cat > ${TFTPROOT}/pxelinux.cfg/default <<-EOF
	prompt 1
	timeout 50
	say Press F1 for boot profiles, default is $PROFNAME in 5 seconds...
	F1 BootProfiles
	default $PROFNAME

	label $PROFNAME
	  kernel ${BOOTPATH}/vmlinuz
	  append initrd=/initramfs ramdisk=8192 ip=dhcp root=nfs;tmpfs

	label local
	  localboot 0
	EOF

	cat > ${TFTPROOT}/BootProfiles <<-EOF
	
	Type $PROFNAME for regular bootup (default after 5 seconds)
	Type local to boot on the local HDD
	EOF

	ln -s "${ROOT}/usr/lib/syslinux/pxelinux.0" "${TFTPROOT}/pxelinux.0"
}

nfs_root_conf()
{
	cat > ${ROOT}/etc/exportfs <<-EOF
	${NFSROOT} $NETADDR/$SUBNET(ro,no_root_squash,async,no_subtree_check)
	EOF

	mkdir -p ${NFSROOT}
	einfo "${NFSROOT} has been populated, all configs point to this root"
	einfo "to boot, furthermore, the fonfigs expect the kernel to be"
	einfo "${NFSROOT}/boot/vmlinuz"
}

parse_config()
{
	[[ -f ${1} ]] || die "${1} missing!!! re-emerge ${PF}"
	if ! use autoconfigure; then
		. ${1}
		[[ $CONFIG_OK != "yes" ]] && die "You need to edit ${CONFIG_FILE} and set CONFIG_OK=\"yes\""
	fi
}

src_install()
{
	dodir ${CONFPATH}
	insinto ${CONFPATH}
	doins ${FILESDIR}/${TEMPLATE_FILE}

	if ! use autoconfigure; then
		elog "You need to edit ${CONFPATH}/${CONFIG_FILE} to your likings"
		elog "Once you are done, set CONFIG_OK=\"yes\" in there and"
		elog "call emerge --config =${CATEGORY}/${PF}"
	fi
}

pkg_config()
{
	parse_config "${CONFPATH}/${CONFIG_FILE}"

	dnsmasq_conf
	pxe_conf
	nfs_root_conf
	
	for I in dnsmasq netmount
	do
		rc-update add $I default
	done
}