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/mount-zfs.sh.in

@@ -0,0 +1,71 @@
+#!/bin/sh
+
+. /lib/dracut-lib.sh
+
+ZPOOL_FORCE=""
+
+if getargbool 0 zfs_force -y zfs.force -y zfsforce ; then
+	warn "ZFS: Will force-import pools if necessary."
+	ZPOOL_FORCE="-f"
+fi
+
+case "$root" in
+	zfs:*)
+		# We have ZFS modules loaded, so we're able to import pools now.
+		if [ "$root" = "zfs:AUTO" ] ; then
+			# Need to parse bootfs attribute
+			info "ZFS: Attempting to detect root from imported ZFS pools."
+
+			# Might be imported by the kernel module, so try searching before
+			# we import anything.
+			zfsbootfs=`zpool list -H -o bootfs | sed 'q'`
+			if [ "$?" != "0" ] || [ "$zfsbootfs" = "" ] || \
+				[ "$zfsbootfs" = "no pools available" ] ; then
+				# Not there, so we need to import everything.
+				info "ZFS: Attempting to import additional pools."
+				zpool import -N -a ${ZPOOL_FORCE}
+				zfsbootfs=`zpool list -H -o bootfs | sed 'q'`
+				if [ "$?" != "0" ] || [ "$zfsbootfs" = "" ] || \
+					[ "$zfsbootfs" = "no pools available" ] ; then
+					rootok=0
+					pool=""
+
+					warn "ZFS: No bootfs attribute found in importable pools."
+
+					# Re-export everything since we're not prepared to take
+					# responsibility for them.
+					zpool list -H | while read fs rest ; do
+						zpool export "$fs"
+					done
+
+					return 1
+				fi
+			fi
+			info "ZFS: Using ${zfsbootfs} as root."
+		else
+			# Should have an explicit pool set, so just import it and we're done.
+			zfsbootfs="${root#zfs:}"
+			pool="${zfsbootfs%%/*}"
+			if ! zpool list -H $pool > /dev/null ; then
+				# pool wasn't imported automatically by the kernel module, so
+				# try it manually.
+				info "ZFS: Importing pool ${pool}..."
+				if ! zpool import -N ${ZPOOL_FORCE} $pool ; then
+					warn "ZFS: Unable to import pool ${pool}."
+					rootok=0
+
+					return 1
+				fi
+			fi
+		fi
+
+		# Above should have left our rpool imported and pool/dataset in $root.
+		# We need zfsutil for non-legacy mounts and not for legacy mounts.
+		mountpoint=`zfs get -H -o value mountpoint $zfsbootfs`
+		if [ "$mountpoint" = "legacy" ] ; then
+			mount -t zfs "$zfsbootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
+		else
+			mount -o zfsutil -t zfs "$zfsbootfs" "$NEWROOT" && ROOTFS_MOUNTED=yes
+		fi
+		;;
+esac