nfsroot-cleanup: make /var/lib/nfs/rpc_pipefs path configurable

/tmp/nfs.rpc_pipefs_path can contain the path where
/var/lib/nfs/rpc_pipefs will be moved before switch_root.

This is useful if /var is a separate partition in the real root.

modules.d/95nfs/nfsroot-cleanup.sh

@@ -1,3 +1,7 @@
+rpcpipefspath=`cat /tmp/nfs.rpc_pipefs_path`
+
+[ -z "$rpcpipefspath" ] && rpcpipefspath=var/lib/nfs/rpc_pipefs
+
 pid=$(pidof rpc.statd)
 [ -n "$pid" ] && kill $pid
 
@@ -9,10 +13,10 @@ pid=$(pidof rpcbind)
 
 if incol2 /proc/mounts /var/lib/nfs/rpc_pipefs; then 
     # try to create the destination directory
-    [ -d $NEWROOT/var/lib/nfs/rpc_pipefs ] || mkdir -p $NEWROOT/var/lib/nfs/rpc_pipefs 2>/dev/null
+    [ -d $NEWROOT/$rpcpipefspath ] || mkdir -p $NEWROOT/$rpcpipefspath 2>/dev/null
 
-    if [ -d $NEWROOT/var/lib/nfs/rpc_pipefs ]; then
-	mount --move /var/lib/nfs/rpc_pipefs $NEWROOT/var/lib/nfs/rpc_pipefs
+    if [ -d $NEWROOT/$rpcpipefspath ]; then
+	mount --move /var/lib/nfs/rpc_pipefs $NEWROOT/$rpcpipefspath
     else
 	umount /var/lib/nfs/rpc_pipefs
     fi