New ISO builder

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxx>]

    I have put together a new ISO builder in /usr/src/nrelease.  It will
    create a bootable ISO image on a CD which is basically a full, live
    filesystem.

    No sysinstall is generated (yet).  A writable /dev, /tmp, /var, and /etc
    is created via MFS, so basically the entire system should work booted
    off of CD.  The CD will boot into a login prompt.  Since root has no
    password, just login as root.

    I'm hoping this can form the basis for the single-CD idea that I've
    been batting around.

    There are currently two make targets in /usr/src/nrelease:

    release:	This will do a full buildworld and buildkernel (GENERIC)
		with the current source tree, then generate the release
		ISO and directory structure in /usr/release. 

    quickrel:	This will do a 'quick' buildworld and buildkernel (i.e.
		-DNOCLEAN) and then generate the release ISO and directory
		structure in /usr/release.

    realquickrel: This is even faster.  It assumes that the buildkernel and
		buildworld have already been done and just generates the ISO
		directory structure and ISO file in /usr/release.

    You need to have several Gigs of free space in /usr, not counting
    space used by buildworld and buildkernel.  Be sure to do a complete
    update of your CVS tree and sources before running these targets.

    The ISO file defaults to /usr/release/dfly.iso.  My first ISO is
    available for download on the main site in the download section.
    See:

	http://www.dragonflybsd.org/Main/download.cgi

    --

    The ISO contains a complete base distribution plus installed binaries
    for two ports: cvsup and mkisofs.

					-Matt
					Matthew Dillon 
					<dillon@xxxxxxxxxxxxx>