Make dracut module-setup.sh an autoconf config file

This ensures that module-setup.sh script will always be able to
install the required dracut components regardless of how the zfs
package was configured.

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

dracut/90zfs/parse-zfs.sh.in

@@ -0,0 +1,50 @@
+#!/bin/sh
+
+. /lib/dracut-lib.sh
+
+# Let the command line override our host id.
+spl_hostid=`getarg spl_hostid=`
+if [ "${spl_hostid}" != "" ] ; then
+	info "ZFS: Using hostid from command line: ${spl_hostid}"
+	echo "${spl_hostid}" > /etc/hostid
+elif [ -f /etc/hostid ] ; then
+	info "ZFS: Using hostid from /etc/hostid: `cat /etc/hostid`"
+else
+	warn "ZFS: No hostid found on kernel command line or /etc/hostid.  "
+	warn "ZFS: Pools may not import correctly."
+fi
+
+case "$root" in
+	""|zfs|zfs:)
+		# We'll take root unset, root=zfs, or root=zfs:
+		# No root set, so we want to read the bootfs attribute.  We can't do
+		# that until udev settles so we'll set dummy values and hope for the
+		# best later on.
+		root="zfs:AUTO"
+		rootok=1
+
+		info "ZFS: Enabling autodetection of bootfs after udev settles."
+		;;
+
+	ZFS\=*|zfs:*|zfs:FILESYSTEM\=*|FILESYSTEM\=*)
+		# root is explicit ZFS root.  Parse it now.
+		# We can handle a root=... param in any of the following formats:
+		# root=ZFS=rpool/ROOT
+		# root=zfs:rpool/ROOT
+		# root=zfs:FILESYSTEM=rpool/ROOT
+		# root=FILESYSTEM=rpool/ROOT
+
+		# Strip down to just the pool/fs
+		root="${root#zfs:}"
+		root="${root#FILESYSTEM=}"
+		root="zfs:${root#ZFS=}"
+		rootok=1
+
+		info "ZFS: Set ${root} as bootfs."
+		;;
+esac
+
+# Make sure Dracut is happy that we have a root and will wait for ZFS
+# modules to settle before mounting.
+ln -s /dev/null /dev/root 2>/dev/null
+echo '[ -e /dev/zfs ]' > $hookdir/initqueue/finished/zfs.sh