Turn the init.d scripts into autoconf config files

This change ensures the paths used by the provided init scripts
always reference the prefixes provided at configure time.  The
@sbindir@ and @sysconfdir@ prefixes will be correctly replaced
at build time.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #336

etc/init.d/zfs.gentoo.in

@@ -0,0 +1,111 @@
+#!/sbin/runscript
+# Copyright 1999-2011 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/sys-fs/zfs/files/zfs,v 0.9 2011/04/30 10:13:43 devsk Exp $
+
+depend()
+{
+	# bootmisc will log to /var which may be a different zfs than root.
+	before net bootmisc
+	after udev localmount
+	keyword -lxc -openvz -prefix -vserver
+}
+
+ZFS="@sbindir@/zfs"
+ZPOOL="@sbindir@/zpool"
+ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
+ZFS_MODULE=zfs
+
+checksystem() {
+	if [ ! -c /dev/zfs ]; then
+		einfo "Checking if ZFS modules present"
+		if [ "x$(modprobe -l  $ZFS_MODULE | grep $ZFS_MODULE)" == "x" ]; then
+			eerror "$ZFS_MODULE not found. Is the ZFS package installed?"
+			return 1
+		fi
+	fi
+	einfo "Checking if zfs userspace tools present"
+		if [ ! -x $ZPOOL ]; then
+			eerror "$ZPOOL binary not found."
+			return 1
+		fi
+		if [ ! -x $ZFS ]; then
+			eerror "$ZFS binary not found."
+			return 1
+		fi
+	return 0
+}
+
+start() {
+	ebegin "Starting ZFS"
+	checksystem || return 1
+
+	# Delay until all required block devices are present.
+	udevadm settle
+
+	if [ ! -c /dev/zfs ]; then
+		modprobe $ZFS_MODULE
+		rv=$?
+		if [ $rv -ne 0 ]; then
+			eerror "Failed to load the $ZFS_MODULE module, check 'dmesg|tail'."
+			eend $rv
+			return $rv
+		fi
+	fi
+
+	# Import all pools described by the cache file, and then mount
+	# all filesystem based on their properties.
+	if [ -f $ZPOOL_CACHE ]; then
+		einfo "Importing ZFS pools"
+		# as per fedora script, import can fail if all pools are already imported
+		# The check for $rv makes no sense...but someday, it will work right.
+		$ZPOOL import -c $ZPOOL_CACHE -aN 2>/dev/null || true
+		rv=$?
+		if [ $rv -ne 0 ]; then
+			eerror "Failed to import not-yet imported pools."
+			eend $rv
+			return $rv
+		fi
+	fi
+
+	einfo "Mounting ZFS filesystems"
+	$ZFS mount -a
+	rv=$?
+	if [ $rv -ne 0 ]; then
+		eerror "Failed to mount ZFS filesystems."
+		eend $rv
+		return $rv
+	fi
+
+	einfo "Exporting ZFS filesystems"
+	$ZFS share -a
+	rv=$?
+	if [ $rv -ne 0 ]; then
+		eerror "Failed to export ZFS filesystems."
+		eend $rv
+		return $rv
+	fi
+
+	eend 0
+	return 0
+}
+
+stop()
+{
+	ebegin "Unmounting ZFS filesystems"
+	$ZFS umount -a
+	rv=$?
+	if [ $rv -ne 0 ]; then
+		einfo "Some ZFS filesystems not unmounted"
+	fi
+
+	# Don't fail if we couldn't umount everything.  /usr might be in use.
+	eend 0
+	return 0
+}
+
+status()
+{
+	# show pool status and list
+	$ZPOOL status && echo && $ZPOOL list
+}