updates

README.md

@@ -83,6 +83,28 @@ There are 3 ansible roles:
 
 3. toxcore : 
 
+In addition, toxcore calls an included role ansible-gentoo_install.
+This is an updated version of the abandonned
+https://github.com/agaffney/ansible-gentoo_install/ This role,
+when run on the host, builds the Gentoo base qcow image. As a safety
+feature, you must create the qcow2 image and activate it with:
+
+modprobe nbd
+qemu-img $BOX_NBD_BASE_QCOW 20G
+qemu-nbd -c $BOX_NBD_DEV $BOX_NBD_BASE_QCOW
+
+and put these values into the hosts.yml file in the pentoo or devuan
+target, depending on your host operating system. The filesytem that
+holds base qcow2 $BOX_NBD_BASE_QCOW must have at least 12G available,
+and may grow to almost 20G.
+
+After you have finished building the base qcow2 image, you will want
+to dismount it with qemu-nbd -d $BOX_NBD_DEV. Be careful and look
+in /proc/partitions to see if it is still there after you dismount it:
+it the partition is busy the dismount will fail silently, and you can
+get into trouble if partprobe complains. You may have to reboot,
+or it may resolve itself. Wierd.
+
 Each role has been conditionalized to run with different connections.
  
 ## Connection Types