sys-fs/zfs/files/zfs-shutdown


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#!/sbin/runscript
# Copyright 1999-2012 Gentoo Foundation
# Released under the 2-clause BSD license.
# $Header: /var/cvsroot/gentoo-x86/sys-fs/zfs/files/zfs-shutdown,v 1.2 2012/11/29 05:19:12 ryao Exp $

description="Export ZFS Root Filesystem"

copy_binaries() {
	local destdir=$1
	shift
	lddtree "$@" \
		| tr ')(' '\n' \
		| awk  '/=>/{ if($3 ~ /^\//){print $3}}' \
		| sort \
		| uniq \
		| cpio -p --make-directories --dereference --quiet $destdir

}

depend()
{
	need mount-ro
	keyword -prefix -openvz -vserver -lxc
}

start()
{

	ROOTFSTYPE=$(df -TP / | awk 'NR>1{print $2}')
	TMPDIR='/dev/pivot_root'
	MOVEFS=$(df -TP -x zfs | awk 'NR>2{print $7}')

	# Make sure that we are dealing with zfs
	if test "${ROOTFSTYPE}" = "zfs"
	then
		eerror "rootfs is not zfs"
		return 1
	fi

	# Construct new rootfs
	mkdir -p "${TMPDIR}"
	mount -t tmpfs none ${TMPDIR}
	mkdir "${TMPDIR}/oldroot" "${TMPDIR}/dev"
	mknod -m 660 "${TMPDIR}/dev/null" c 1 3
	mknod -m 660 "${TMPDIR}/dev/zfs" c 10 59

	# Make tmpfs root filesystem
	copy_binaries ${TMPDIR} $(which chroot sh cat mount mkdir zfs zpool)

	# Make directories for temporary mounts
	for i in $(seq $(echo "$MOVEFS" | wc -w)); do mkdir "${TMPDIR}/${i}"; done;

	# Pass temporary mount information to chroot
	echo "$MOVEFS" > "${TMPDIR}/movefs"

	# Copy shutdown script
	cp /usr/share/zfs/linuxrc "${TMPDIR}/linuxrc"

	# Pivot into new root
	cd "${TMPDIR}"
	pivot_root . oldroot
	exec chroot . /linuxrc

}