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=============================================================================== Gnome-Games =============================================================================== Contents -------- - Overview - The Games - Website - License - Mailing List - Maintainers - Bug Reports - Requirements - Building Gnome-Games - Network Games - Security Issues - The Future Overview -------- Gnome-games is a collection of simple, but addictive, games from the GNOME desktop project. They represent many of the popular games and include card games, puzzle games and arcade games. They are meant to be the sort of game that can be played in five minutes or so. They are also meant to be fun enough that you will play them again and again. Of course we can't be held responsible for the time and productivity lost while playing them. The Games --------- Here is a list of the games in this compilation along with a brief description. The names in brackets are the program names you use from the command line. Four-in-a-row The classic game where each player tries to make a line of four disks before their opponent. There is a very popular version of this in the real world called Connect Four. (gnect) Gnometris That Russian game of fitting falling geometric shapes. Need I say more ? (gnometris) Iagno Gnome version of the popular Othello (R) disk flipping game. The goal is to control all the disks on the board by trapping your opponents disks between two of yours. (iagno) Klotski A series of sliding block puzzles. (gnotski) Five or More You move balls around the grid and try and form lines of the same colour to make them disappear. Unfortunately more balls keep dropping in ... (glines) Chess glChess is a chess game which supports several chess engines, with 2D and optionally 3D support if OpenGl and GtkGLExt is present. glChess is written in Python and uses GTK+ and Cairo to render the chess board. glChess uses gnuchess as the default AI player. (glchess) Sudoku Gnome Sudoku is a logic game with a Japanese name that has recently exploded in popularity. (gnome-sudoku) Mahjongg A tile-based solitaire game with an oriental flavor. Remove tiles in matching pairs from a pile to try and dismantle it. (mahjongg) Mines The popular logic puzzle minesweeper. Clear mines from a board using hints from squares you have already uncovered. (gnomine) Nibbles The "worm" game. You pilot a worm around a maze trying to collect diamonds. With each diamond your worm grows and navigation becomes ever more difficult. (gnibbles) Robots The classic BSD robots game where you have to avoid a hoard of robots who are trying to kill you. Mac users might remember a similar "daleks" game. (gnobots2) Same GNOME You start with a grid of stones of different colors. You can only remove stones where two or more of the same colour touch each other. The goal is to remove as many as possible. You score more points by removing them in bigger groups. Tali Sort of poker with dice and less money. An ancient Roman game, this variant is similar to Yahtzee (R). (gtali) Tetravex A puzzle game where you have to match a grid of tiles together. The skill level ranges from the simple two by two up to the seriously mind-bending six by six grid. (gnotravex) Website ------- Further information and screenshots can be found at: http://www.gnome.org/projects/gnome-games/ Aspiring developers should see: http://live.gnome.org/GnomeGames License ------- This is Free Software and there are no restrictions on your use and enjoyment of it. In most countries copyright law would prevent you from sharing these programs, either as is or in a modified form. However we provide a license to allow you to modify and redistribute this code. This is the GNU General Public License and it can be found in the file COPYING. This allows you to do almost anything you would like with this software, including selling it. There are only two catches, firstly you can't restrict anyone else from copying the code, you have to give them the same freedoms you received (including access to the source code). Secondly, because the code may have been modified and we have no idea what state it will be in when it reaches you, we cannot provide a warranty. All the details can be found in the file COPYING which should have accompanied this software. If it didn't you can find a copy at http://www.gnu.org/copyleft/gpl.html or write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Some parts of this software, notably some of the artwork, are licensed under different terms or have been placed in the public domain. None of these terms are more restrictive than what has been described above. Please check the artwork files for full details. If there is no information embedded within the file or alongside it then it is licensed under the GPL. Mailing List ------------ Gnome-games has a mailing list at <email@example.com>. You can subscribe to the list at: http://mail.gnome.org/mailman/listinfo/games-list and browse the archives at: http://mail.gnome.org/archives/games-list/ The mailing list is for announcements and discussion about games written for the GNOME environment. It is moderated and low volume. Maintainers ----------- The current maintainers for gnome-games are: Jason Clinton <firstname.lastname@example.org> While you can email them with suggestions and bug reports it is better to use either the bug tracking system (see below) or the mailing list. Even for suggestions the bug tracking system is better because it ensures that there is an archive of the discussion and it is harder for the maintainer to loose suggestions. For more general discussion, policy issues and issues that many people will be interested in, the mailing list is the best place. Reporting Bugs -------------- If you find any bugs in gnome-games, or even just have a suggestion for an improvement to the games then please submit a bug report. There are two ways to do this, either by using the web-based interface to the GNOME bug tracking system at http://bugs.gnome.org/simple-bug-guide.cgi or use the bug reporting tool, which you can find under the Development sub-menu of the GNOME menu. The bug reporting tool can also be launched from the command line via the bug-buddy command. If a game crashes then the bug reporting tool will be automatically launched. There is one problem with the standard bug reporting tools and gnome-games. Because gnome-games uses setgid bit to give the programs extra privileges the ordinary bug reporting tools don't do a complete job because a stack trace cannot be made. Stack traces are very useful in determining what went wrong. To get a proper stack trace with gnome-games binaries then you should try and recreate your crash while running as the root use, or, with the setgid bit temporarily removed from the file. Both these require root privileges which you may not have. Contributing ------------ See the file HACKING and the webpages mentioned within for details about contributing to gnome-games. In particular, the following page is relevant: http://live.gnome.org/GnomeGames/Contributing Requirements ------------ This is the list of required software packages for gnome-games: - GNOME 2.16.0 - GTK+ 2.8.0 - GNOME Doc Utils - gnome-doc-utils 0.10.0 - Cairo 1.0 - RSVG 2.14.0 - Guile 1.8.0 - GStreamer 0.10.11 - Python 2.4 - PyGTK - python-gtk2-dev 2.10.0 - libxml 2.4.0 - scrollkeeper - expat These packages are optional, but highly recommended: - SDL_Mixer 1.2.0 or later for sound support using SDL. - gtkglext 1.2.0 , pygtkglext 1.1.0 and pyopengl 2.0 for 3D support in Chess. To compile these packages, we recommend using the baseline GNOME 2.18.x development packages. While gnome-games may compile with older versions, we will not accept bug reports for games used under those conditions. GStreamer 0.10 is required by gnome-games, and is used to play sounds. SDL_Mixer is also supported for playing sounds. CVS checkouts will require the latest intltool. In addition it is useful to have a working C++ compiler (e.g. g++, part of the gcc suite) and the guile implementation of the Scheme programming language version 1.6 or later (http://www.gnu.org/software/guile/guile.html). If either of these is missing then the games that rely on them will simply not be built. glChess can optionally take advantage of Python OpenGL and GtkGLExt to render the board using 3D OpenGl. glChess supports any CECP compatible AI, such as crafty or gnuchess. See the README file in the glchess directory for more information about glChess and it's optional software dependencies. The games that require additional packages are: C++: Gnometris Python: glchess, gnome-sudoku Building Gnome-Games -------------------- Gnome-games uses the GNU automake system and installation may be as easy as: $ ./configure $ make install Generic, but detailed, instructions can be found in the file INSTALL. There are several gnome-games specific options you can pass to configure. These security related options are: --disable-setgid Do not set the setgid bit on the installed binaries. --with-scores-group=group If you are using setgid binaries, set the group for the programs. The default is games. --with-scores-user=user If you are using setgid binaries, set the user for the programs. The default is games. For a discussion of the details behind these options and why you might want to change them see the "Security" section. In general you will not need to change any of them. To select which games to compile use --enable-omitgames and --enable-games. Each option takes a comma separated list of directory names (not the screen-names of the games). "all" is also a valid name. For example: ./configure --enable-omitgames=gnometris,gnome-stones would compile all the games except gnometris and gnome-stones. ./configure --enable-omitgames=all --enable-games=gnomine would only build the gnomine game. The choice of the awkward phrase "enable-omitgames" is due to a limitation in the autoconf tools which doesn't allow us to supply an argument to --disable-games. ./configure --enable-games=none,gnomine has the same effect. The names in the lists are applied in order. Use './configure --help' for a complete list of currently supported options and environment variables. If you are compiling gnome-games from CVS you should look at: http://www.gnome.org/projects/gnome-games/contributing.html Network Games -------------------- Security Issues --------------- It might seem a little strange that a collection of games needs to talk about security issues, but it all stems from an attempt to avoid cheating. To stop people writing arbitrary scores into the score file without actually having played the game, the games are given special privileges and the score files are set to be only writable by programs with these privileges. In this case the privilege is being part of the games group. The potential problem comes when there are bugs in the games that allow someone to get the program to do something else (like classic buffer overruns). This gives the (supposedly) evil user a way to do things with the same privileges as the game, but not necessarily the things that were intended. This is generally considered to be bad. There are two mitigating factors here: a) The programs open the score files and drop privileges very shortly after they have been started. This severely reduces the scope for an exploitable to occur. b) On most systems having the privileges of the games group should allow you to do no more than change high score files. The problem is that in a) the probability is small, but not zero, and in b) "most systems" is not "all systems". If you are using a typical Linux distribution then you should have no problems. If you don't have a typical system and the "games" group is somewhat more special than a way of maintaining the high scores then you may need to change things. If you need to change things, here are your options: 1) Do not use setgid binaries. This means that high score tracking won't work (although you can make the files world-writable and therefore open to use/abuse by everyone). Use the --disable-setgid at configuration time to do this. 2) Change the group used. Creating a new, unique, group for gnome-games (e.g. gnomegames) is the best solution. You can change the group (and user) used via the --with-scores-group and --with-scores-user options to configure at compile time. The Future ---------- As time marches on, we shall strive to drag more of our games kicking and screaming into the 21st century. The following is a short list of recent priorities, and many more can be found in the bug tracker and the TODO file. - Usability, Accessibility and Fancibility improvements. - Better graphics rendering quality and speed. - Making it easy for individual players to introduce their own themes. - During the 2.17.x cycle, one old game will be replaced with one new game!