YACS - Yet Another CD Script :-)
================================
(better known as debian-cd)

Copyright 1999-2001 Raphaël Hertzog <hertzog@debian.org>
This set of tools is licensed under the General Public License
version 2 or any later version. You can find it in 
/usr/share/common-licenses/GPL on a Debian GNU system.

Thanks to Steve McIntyre <stevem@chiark.greenend.org.uk> for his
work on slink_cd/debian_cd. Some ideas come from his script.

Thanks to all the contributors on the debian-cd mailing list.

What is needed ?
================
Software :
- the apt-get (>= 0.3.11.1) tool
- apt-utils (for apt-ftparchive)
- perl (>= 5.004)
- bash (or another POSIX shell)
- make
- mkisofs/mkhybrid (mkisofs also provides the isoinfo binary used by the
  Pseudo Image Kit)
- the perl Digest::MD5 module
- lynx (for text version of README.html)
- if you want to generate .list files: tempfile, as included in debianutils
  >= 1.6 (not absolutely necessary, workaround described in tools/pi-makelist)
- if you want to generate jigdo files: jigdo-file (see below)
Other :
- lots of free space on your disks
- a Debian mirror (on a partition where you can write, if you can't write
  on it then you may try to use a symlink farm but it's not the
  recommended way to build Debian CDs)

		-------------------------------
		- GENERATING DEBIAN CD IMAGES -
		-------------------------------


For people that do not have time, here's the quick explanation :
================================================================

Edit the CONF.sh and change the PATHs for the mirror and so on.
$ vim CONF.sh
$ . CONF.sh
$ make distclean
$ make status
$ make list COMPLETE=1 SIZELIMIT1=555000000 SRCSIZELIMIT=665000000
$ make official_images
[ or if you want only binary images :
  $ make bin-official_images ]

But you really should consider reading further for more information.
You can also give a look at build.sh and build_all.sh for an automatized
way of building CD images. 

How to build a CD set - step by step
====================================

If not yet done, cd to the /usr/share/debian-cd/ directory.

The process of building a CD is decomposed as follow :

- first configure what is needed in CONF.sh and source it
  in your shell
  $ . CONF.sh
  The exported environment variables will be used by all the
  tools involved here (Makefiles, perl scripts, shell scripts).

  If you want to build CD images for more than one arch, you will
  have to build them one after the other (you may use a shell
  script for this).

  Note that the temporary dir must be on the same device than the
  mirror because debian-cd uses hardlinks for generating an image 
  tree. If you can't do this, you'll have to use the symlink farm.
  The symlink farm is explained at the end of this README.

  Keep in mind that the environment variables will stay in the
  environment after your debian-cd run, and may interfere with
  other program using the same variables (kernel-package for
  example ...). So if you want to be 100% safe, run debian-cd in a
  separate shell that you exit afterwards.
  
- let's clean everything that may still be there from previous runs :
  $ make distclean

- now we'll check if your mirror is ok (with good Packages files) :
  $ make mirrorcheck

- then you will have to launch this for initializing the
  temporary directory used for the build :
  $ make status
  If this has failed then this will be automatically launched :
  $ make correctstatus
  However note that make status should never fail if it is
  used for building a CD set for the stable release ...

- now you can decide what you want on your CDs
  $ make list TASK=tasks/debian-2.2 COMPLETE=1
  or
  $ make list TASK=tasks/gnome COMPLETE=0 SIZELIMIT=576716800
  or
  $ export NONFREE=1; make list TASK=tasks/your-task-here COMPLETE=1
  or for something like an official image for the USA (without non-US &
  non-free) :
  $ make list COMPLETE=1 SIZELIMIT1=576716800
  .... take a look at the file tasks/* to see the options you can have :)
  
  You can change the behaviour of this command with the following
  variables :
  - if NONUS is set, then packages from non-US will be allowed (the value
    of NONUS must be the path to the non-US mirror if you have one)
  - if FORCENONUSONCD1 is set also, then packages will be
    rearranged so that non-US packages are all on CD#1. This
    includes the non-free ones if you specify NONFREE. Then 2 separate
    copies of CD#1 will be produced, identical in every respect except
    for the inclusion/lack of non-US packages. The same happens for
    the source CDs when they are built.
  - if NONFREE is set, then packages from non-free will be allowed
    (NONFREE must be exported to all sub-shells)
  - if EXTRANONFREE is set, then non-free packages will be included
    on an extra CD (the last CD in fact). Don't use NONFREE and
    EXTRANONFREE at the same time !
    (EXTRANONFREE must be exported to all sub-shells)
  - if COMPLETE is set, all packages that are not listed in the
    selected task file will be included at the end
  - if SIZELIMIT is set, it will be used as the maximum size that
    we can put into each CD
  - if SIZELIMIT<X> (with <X> beeing a integer) is set, it will be used 
    as the maximum size of the X'th binary CD. SIZELIMIT<X> overrides
    SIZELIMIT ...
  - if SRCSIZELIMIT is set, it's used as the maximum size for source CD
  - if SRCSIZELIMIT<X> (with <X> beeing an integer) is set, it will be
    used as the maximum size of the X'th source CD

  This target calls the targets "bin-list" and "src-list" that can be used to
  build only binary CDs or only source CDs.

- it may be time to add the disks-arch stuff and to make the CDs bootable
  $ make bootable
  This does affect only the binary CDs.

  If you want to use boot-floppies built by yourself you can give
  a parameter BOOTDISKS=<dir> giving the directory where
  they are (note that $BOOTDISKS/current must be a symlink to the
  real directory, it must follow the same setup than in the FTP
  mirror). Your boot-floppies must also be on the same partiton than
  your mirror & temporary dir (hardlinks are used here too).

  All CD1 of officials images are bootable (CD for ARM are the exception)
  and the space required for this stuff may not always be taken into
  account in the size calculation. That's why you may need to adjust
  manually SIZELIMIT1 following the size of the boot-floppies set that
  you're using.

- now, we'll add the binary packages to the temporary tree :
  $ make packages

- and we'll add the sources to the temporary tree :
  $ make sources

- if you want to install additional files :
  make bin-extras CD=1 ROOTSRC=/home/ftp/ DIR=goodies/wordperfect
  make src-extras CD=3 ROOTSRC=/home/ftp/ DIR=goodies/kernel-2.3

  The first will copy /home/ftp/goodies/wordperfect/ on the first binary
  CD. It will be in <root of the cd>/goodies/wordperfect ... you can call
  make extras multiple times if you need more. Please note that
  the files to be copied should be on the same partition than
  your mirror (unless you use a symlink farm).

  If you want to do customize your CD even more, you can use the hook
  system. Read below about them.

- We can add an md5sum.txt file on each CD to enable users to check their
  files :
  $ make md5list
  This does call the targets 'bin-md5list' and 'src-md5list'. You can
  choose to call only bin-md5list if you're building only binary images.

- now we can create the images
  $ make images
  If you don't have enough space for all images, you can generate 
  only one image (of the second binary CD for example) with :
  $ make bin-image CD=2
  Of course if you want to build all binary images you'll use :
  $ make bin-images
  And "make src-images" will generate the sources images.

  Note: I use here make images, but you could as well use make
  official_images since the latter is the same as the former with
  some dependencies on targets that you already launched
  (make bootable packages sources).

- if you want to generate a MD5SUMS file with the md5sums of the
  images you can do it with :
  $ make imagesums


Official images
===============

If you use make official_images you're building CD images that have
the same properties than official CD images but they still doesn't
have the name of "Official Images". The name of the images is given
by setting the OFFICIAL and DEBVERSION environment variable (check
CONF.sh). 

Please never ever use the "Official" name for a CD image that you
built yourself. The only images that can be called "Official" are the
ones built by Debian itself and which are provided on Debian's
servers.

The default configuration shipped with this package will automatically
name the images "Unofficial". CD will work exactly in the same way
with all Debian tools, only the label is different. That means you
can use build.sh and build_all.sh to build your "Unofficial" images
without modifying anything.

Local packages
==============

If you provide some custom made packages and you want to put them on
Debian CD set you can do it. Simply put your packages in
$MIRROR/dists/$CODENAME/local/binary-$ARCH/<section>.
The organization of this sub-tree is the same than what you can find
in the main, contrib or non-free part. You may use different section
names if you want. Be sure to create Packages files (and Sources.gz if you
include sources). You can also put your local packages under
$MIRROR/pool/local (just a new facility for people not wanting packages
under dists).

To include local packages, the LOCAL environment variable must be set
to "1" while building the CDs.

You can also set the LOCALDEBS environment variable, and it will be used
instead of MIRROR when looking for local packages.

Additionnal targets
===================

Pseudo Image Kit
----------------
Those of you, who will make images available to people for download may
consider using the Pseudo Image Kit (cf http://cdimage.debian.org for more
information). That's why you can launch "make pi-makelist" that will generate
the *.list files for the images you've just generated.

The tools/pi-makelist script needs the isoinfo binary. You can get the
sources from http://www.fokus.gmd.de/research/cc/glone/employees/joerg.schilling/private/cdrecord.html

Alternatively (and certainly simpler for people using Debian system), the
isoinfo binary is in the mkisofs package (since Debian potato at least).

Jigdo
-----
People wanting to offer the CD images in jigdo format (Jigsaw Download,
the successor to the Pseudo-Image Kit), can indicate so by setting the
DOJIGDO and related variables in CONF.sh. So this is not a target itself,
but a modification of the "images" targets. You can choose only iso
generation (default), only jigdo generation (for highly reduced disk
usage), or both iso and jigdo generation.

Information on jigdo is available at  http://www.debian.org/CD/jigdo-cd/

To generate the jigdo files and templates, the "jigdo-file" program is
needed, which is available via that same URL.

Jigdo-file creates and maintains a cache/database file with checksums of
all files on your Debian mirror. The first time, this may take hours to be
generated (use "top" to see what's going on), so it's wise to keep the
cache in your homedir and not delete it ever. 

Note that jigdo-file can easily use 60+ MB of working memory, so don't use
this on machines with less than 128 MB RAM.

The MD5SUMS file generated by the "imagesums" target will contain the MD5
checksums of all generated images, regardless of the DOJIGDO setting. If
no full iso image is available, the MD5sum will be extracted from the
.template file. A note in the Makefile shows how the original file size
can be extracted from the .template in a similar way.

About the hook system
=====================

A hook script can be executed at different times. You can specify the
script by setting the HOOK variable to the script filename. It will
get 2 arguments, the first is the CD number. The second depends on
where/when the hook script is called. It can be 'before-scanpackages'
or 'before-mkisofs' (their values are explicit ...). When the script
is called, the current directory will be the temporary directory used for
the build (aka $TDIR/$CODENAME-$ARCH).

There are hooks only for binary CDs at the present time. If HOOK is not
set, it will look for a script $BASEDIR/tools/$CODENAME.hook.


About the symlink farm
======================

If you don't have write access on the disk where you have the mirror
or if for another reason hardlink cannot be used, you can try to
use a symlink farm. Instead of having real files, your temporary tree
will be filled with symlinks that mkhybrid will change into files when
it will build the image. You'll need to use a special options. You
have 2 lines of options in CONF.sh as examples.

I've never tested the symlink farm ... it may well generate unusable
images. Don't use it for ISO images that will used by many users.

Note that you will also need a patched mkhybrid that does support the
-F option. Have a look here about it :
http://www.chiark.greenend.org.uk/~stevem/DebianCD/

The mkhybrid package in Debian does support this -F option since 
potato (Debian 2.2).