added own service for creating overlays

rootfs-overlay/usr/lib/nimux/nimux-early-mount.xsh

@@ -0,0 +1,23 @@
+#!/bin/xonsh --no-rc
+# Nimux Early Mount (xonsh)
+
+#mount /mnt
+print("mount /mnt")
+/bin/mount /mnt
+
+# mount root on future accesable place
+print("re-mount rootfs")
+/bin/mkdir -p /mnt/rootfs
+/bin/mount --bind / /mnt/rootfs
+/bin/mount --make-rprivate /mnt/rootfs/
+
+# import zpool
+print("import zpool")
+/sbin/zpool import nimux-zfs
+
+# overlay etc and home with a persistant zfs dataset
+print("overlay mount etc")
+/bin/unionfs -o cow,nonempty /mnt/rootfs.overlay/etc=RW:/mnt/rootfs/etc=RO /etc
+print("overlay mount home")
+/bin/unionfs -o cow,nonempty /mnt/rootfs.overlay/home=RW:/mnt/rootfs/home=RO /home
+