prototype fast installer.
To install a distribution on a new volume, we take an existing
installed volume produced with sipb-xen-make-iso, and
- copy GRUB's data with dd
- frob the partition table with sfdisk, if the disk size is different
- make the filesystem
- twiddle the hostname and root password and whatever else
- make the swap area
- boot!
In this prototype, steps 2 and 4 aren't implemented yet;
steps 1, 3, and 5 all use numbers that come from what the
sipb-xen-make-iso etch installer does rather than from
actually reading the partition table; and the whole thing
is just a program in /usr/sbin, not integrated into what
remctl / the web app invoke.
It all takes about thirty seconds (28.0s most recently),
excluding the boot.
