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[disorder] / README

DisOrder
========

This program is used to play random and chosen tracks from a collection of
digital audio files (for instance MP3 and OGG files).  If you just set it going
it plays random tracks from your collection, but you can also ask for specific
tracks to be played, either via a command line program or a web interface, and
you can 'scratch' the current track.

See CHANGES for details of recent changes to DisOrder.

Currently it only runs on Linux.  It could probably be ported to other UNIX
variants in some cases without too much effort.  Things you will need:

Build dependencies:
  Name             Tested              Notes
  libdb            4.3.21              4.2 and earlier won't work
  libgc            6.3
  libvorbisfile    1.0.1
  libpcre          4.5                 need UTF-8 support
  libmad           0.15.1b
  libgcrypt        1.2.0
  libao            0.8.6
  libasound        1.0.8
  Python           2.3                 (optional)
  GNU C            3.3, 3.4

"Tested" means I've built against that version; earlier or later versions will
often work too.

Runtime dependencies:
 * Players:
   + ogg123 and mpg321 work for me, but you could potentially use others.
 * Web server:
   + Apache 1.3.x works for me, but anything that supports CGI and
     authentication should be suitable.

Development dependencies (only developers will need these):
  Automake         1.9.4               AM_PATH_PYTHON not good enough in 1.7
  Autoconf         2.59
  Libtool          1.5.6               1.4 not good enough
  Arch             1.3-1

Mailing lists:
  http://www.chiark.greenend.org.uk/mailman/listinfo/sgo-software-discuss
   - discussion of DisOrder (and other software), bug reports, etc
  http://www.chiark.greenend.org.uk/mailman/listinfo/sgo-software-announce
   - announcements of new versions of DisOrder


Installation
============

   "This place'd be a paradise tomorrow, if every department had a supervisor
   with a machine-gun"

NOTE: If you are upgrading from an earlier version, see README.upgrades.

1. Build the software.  Do something like this:

     ./configure --sysconfdir=/etc --localstatedir=/var
     make

   See INSTALL for more details about driving configure.  The precise set of
   options you pass to configure is up to you, if you like configuration being
   in /usr/local/etc or wherever then that should work.

   If you only want to build a subset of DisOrder, specify one or more of the
   following options:
     --without-server       Don't build server or web interface
     --without-gtk          Don't build GTK+ client (Disobedience)
     --without-python       Don't build Python support

   See README.client for setting up a standalone client.

2. Install it.  Most of the installation is done via the install target:

     make installdirs install

   The CGI interface has to be installed separately, and you must use Libtool
   to install it.  For instance:

     ./libtool --mode=install install -m 755 progs/disorder.cgi /usr/local/lib/cgi-bin/disorder

   Depending on how your system is configured you may need to link the disorder
   libao driver into the right directory:

     ln -s /usr/local/lib/ao/plugins-2/libdisorder.so /usr/lib/ao/plugins-2/.

3. Create a 'jukebox' user and group, with the jukebox group being the default
   group of the jukebox user.  The server will run as this user and group.
   Check that this user can read your music files and write to the audio
   device, e.g. by playing a track.  The exact name doesn't matter, it could be
   'jukebox' or 'disorder' or 'fred' or whatever.

   Do not use a general-purpose user or group, you must create ones
   specifically for DisOrder.

4. Create /etc/disorder/config.  Start from examples/config.sample and adapt it
   to your own requirements.  In particular, you should:
    * edit the 'player' commands to reflect the software you have installed.
    * edit the 'collection' command to identify the location(s) of your own
      digital audio files.  These commands also specify the encoding of
      filenames, which you should be sure to get right as recovery from an
      error here can be painful (see BUGS).
    * edit the 'scratch' commands to supply scratch sounds (or delete them if
      you don't want any).
    * edit the 'trust' command to reflect the user the web interface will
      eventually run as.
    * edit the 'url' command to give the URL of the web interface.
    * add or remove 'stopword' entries as necessary (these words won't take
      part in track name searches from the web interface).

   See disorder_config(5) for more details.

5. Create /etc/disorder/config.private.  This should be readable only by the
   jukebox group:

     touch /etc/disorder/config.private
     chown root:jukebox /etc/disorder/config.private
     chmod 640 /etc/disorder/config.private

   Set up a username and password for root, for example with line like this:

     allow root somepassword

   Use (for instance) pwgen(1) to create the password.  DO NOT use your root
   password - this is a password to give root access to the server, not to give
   access to the root login.

   See disorderd(8) and disorder_config(5) for more details.

6. Make sure the server is started at boot time.  On many Linux systems,
   examples/disorder.init should be more or less suitable; install it in
   /etc/init.d, adapting it as necessary, and make appropriate links from
   /etc/rc[0-6].d.  If you have a BSD style init then you are on your own.

7. Make sure the state directory (/var/disorder or /usr/local/var/disorder or
   as determined by configure) exists and is writable by the jukebox user.

     mkdir -m 755 /var/disorder
     chown disorder:root /var/disorder

8. Start the server, for instance:

     /etc/init.d/disorder start

   By default disorderd logs to daemon.*; check your syslog.conf to see where
   this ends up and look for log messages from disorderd there.  If it didn't
   start up correctly there should be an error message.  Correct the problem
   and try again.

9. After a minute it should start to play something.  Try scratching it, as any
   of the users you set up in step 5:

     disorder scratch

   The track should stop playing, and (if you set any up) a scratch sound play.

10. Add any other users you want to config.private.  Each user's password
    should be stored in a file in their home directory, ~/.disorder/passwd,
    which should be readable only by them, and should take the form of a single
    line:

      password MYPASSWORD

    (root doesn't need this as the client can read it out of config.private
    when running as root.)

    Note that the server must be reloaded (e.g. by 'disorder reconfigure')
    when new users are added.

    Alternatively the administrator can create /etc/disorder/config.USERNAME
    containing the same thing as above.  It can either be owned by the user and
    mode 400, or owned by root and the user's group (if you have per-user
    groups) and mode 440.

    You can use 'disorder authorize' to automatically pick passwords and
    create these files.

11. Optionally source completion.bash from /etc/profile or similar, for
    example:

      . /usr/local/share/disorder/completion.bash

    This provides completion over disorder command and option names.


Web Interface
=============

   "Thought I was a gonner baby, but I'm bullet proof"

These instructions assumes you are using Apache 1.3.x.

You need to configure a number of things to make this work:

1. If you want to have a 'jukebox' virtual host, modify the DNS (or hosts file
   if you are somehow reading this in the 1980s) accordingly and use a fragment
   such as this one:

     <VirtualHost HOSTNAME>
     DocumentRoot /home/jukebox/public_html
     ServerName jukebox.DOMAIN
     ServerAlias jukebox
     ServerAdmin webmaster@DOMAIN
     ErrorLog /var/log/apache/jukebox/error.log
     TransferLog /var/log/apache/jukebox/access.log
     Alias /static/ /usr/local/share/disorder/static/
     </VirtualHost>

   /static/ should point to the 'static' directory installed by DisOrder.  If
   you don't want to use the name 'static' then you can change the url.static
   label in the web interface configuration to your preferred URL; see
   disorder_config(5) for details.

   Don't forget to reload Apache after modifying its configuration.

   Separate logging is not required but I find it convenient.  Up to you.

2. disorder.cgi assumes it is subject to access control (and in particular uses
   the username to report who did what).  Here's how I configured Apache, given
   the above VirtualHost settings:

     <Directory /home/jukebox>
     Require valid-user
     AuthType basic
     AuthName jukebox
     AuthUserFile /home/jukebox/http.users
     </Directory>

   Adjust this according to wherever you're going to install disorder.cgi and
   its expected URL.

   Don't forget to reload apache after modifying its configuration.  If you got
   it wrong, fix it and restart Apache.

3. Create the password file configured above.  Something like this:

     # htpasswd -b -c /home/jukebox/http.users myusername mypassword
     Adding password for user myusername
     # htpasswd -b /home/jukebox/http.users othername otherpass
     Adding password for user othername

4. The jukebox must be configured to trust the web user.  I added the following
   line to my /etc/disorder/config:

     trust www-data

   This might not be the same on your system!  You have to specify the user
   that the CGI script runs as, whatever that is.

5. Install disorder.cgi in an appropriate location.  Remember to make it
   executable.  With the above configuration I installed it as
   ~jukebox/public_html/index.cgi.

6. Give www-data (or whatever user it is) a password and edit
   /etc/disorder/config.private accordingly.  This file should be mode 640 and
   owned by root:jukebox.  The line should look something like this:

     allow www-data MYPASSWORD

   After editing the config file, you must make the daemon re-read it:

     disorder reconfigure

7. Teach www-data its password, by putting it in /etc/disorder/config.www-data.
   This file should be mode 640 and owned by root:www-data.

     password MYPASSWORD

   (You could also use ~www-data/.disorder/passwd for this but on some systems
   the web server user's home directory is inside the document root, which
   would have rather unfortunate consequences.)

8. Try it out.  You should be asked for a username and password that you
   configured earlier, and be shown details of what is playing and what other
   tracks have been configured for future play.

9. Some features take time to start working, for instance those involving
   reporting the length of tracks.  This is because the server starts up as
   quickly as possible even if the full track data has not yet been gathered;
   the track data is then calculated in the background.

10. If you run into problems, always look at the appropriate error log; the
    message you see in your web browser will usually not be sufficient to
    diagnose the problem all by itself.

11. If you have a huge number of top level directories, then you might find
    that the 'Choose' page is unreasonably large.  If so add the following line
    to /etc/disorder/options.user:
      label sidebar.choosewhich choosealpha

    This will make 'Choose' be a link for each letter of the 26-letter Roman
    alphabet; follow the link and you just get the directories which start with
    that letter.  The "*" link at the end gives you directories which don't
    start with a letter.

    You can copy choosealpha.html to /etc/disorder and edit it to change the
    set of initial choices to anything that can be expressed with regexps.  The
    regexps must be URL-encoded UTF-8 PCRE regexps.


Copyright
=========

  "Nothing but another drug, a licence that you buy and sell"

DisOrder - select and play digital audio files
Copyright (C) 2003, 2004, 2005, 2006 Richard Kettlewell
Portions extracted from MPG321, http://mpg321.sourceforge.net/
  Copyright (C) 2001 Joe Drew
  Copyright (C) 2000-2001 Robert Leslie
Binaries may derive extra copyright owners through linkage (binary distributors
are expected to do their own legwork)

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA

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