[Phpgroupware-cvs] phpgwapi/doc/create_ramdisk.php.txt, 1.3

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Update of /phpgwapi/doc
Added Files:
        Branch: 
          create_ramdisk.php.txt

date: 2004/12/30 06:47:26;  author: skwashd;  state: Exp;  lines: +3 -3

Log Message:
new HEAD
=====================================================================
<?php
        
/**************************************************************************\
        * phpGroupWare - Experimental tools                                     
   *
        * http://www.phpgroupware.org                                           
   *
        * Written by Joseph Engo <address@hidden>                          *
        * --------------------------------------------                          
   *
        *  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.                                           
   *
        
\**************************************************************************/

        /* $Id: create_ramdisk.php.txt,v 1.3 2004/12/30 06:47:26 skwashd Exp $ 
*/

        /* !!! WARNING !!!
        ** This is highley experimental!  Do NOT run it unless you know what 
you are doing!
        ** You can serious screaw things up!
        **
        ** Requirements:
        **  - Must be run as root
        **  - You need to have RAM disk support complied into the kernel
        **  - You have to have the CGI binary for PHP
        **  - This ONLY works with Linux
        **  - The 2.2 kernel is limited to 20 RAM disks, so you will have to 
cut down on what you copy over
        **  - I wouldn't run this on a server with less then 196 MB of RAM.  If 
it has less, performance
        **    will only decrease.  Since proccess will need to swap out to disk.
        **
        ** The phpGroupWare development team does not support this program in 
anyway.  If it breaks
        ** or messes up your system, don't email us.  Don't submit bug reports. 
 If you do find ways to make
        ** it better, please submit patches directly to me. address@hidden
        */

        $debug = True;

        // Locations of your permanent copy, you will need it to be setup 
already
        define('HARD_COPY','/home/jengo/public_html');
        // Where you want your install to be
        define('RAM_COPY','/var/www/html');

        function command($command)
        {
                global $debug;

                if ($debug)
                {
                        echo $command . "\n";
                }
                else
                {
                        system($command);
                }
        }

        command('mke2fs /dev/ram0 200');
        command('mkdir ' . RAM_COPY . '/phpgroupware');
        command('mount -t ext2 /dev/ram0 ' . RAM_COPY . '/phpgroupware');
        command('cp ' . HARD_COPY . '/phpgroupware/* ' . RAM_COPY . 
'/phpgroupware');

        $ram_drive_num = 1;
        $dh = opendir(HARD_COPY . '/phpgroupware/');
        while ($file = readdir($dh))
        {
                // The 2.2 kernel can only have 20 ram disks
                if ($ram_drive_num == 21)
                {
                        exit;
                }

                if ($file != '.' && $file != '..' && $file != 'CVS' && $file != 
'phpgroupware' && is_dir($file))
                {
                        $_du_string = 'du -s ' . HARD_COPY . '/phpgroupware/' . 
$file;
                        $_du        = `$_du_string`;;
                        preg_match('/(\w+)\s/',$_du,$du);
                        $du_size    = ereg_replace(' ','',$du[0]);

                        // Make it slighty larger, so the files copy correctly
                        $du_size    = $du_size + 400;

                        command('mke2fs /dev/ram' . $ram_drive_num . ' ' . 
$du_size);
                        command('mkdir ' . RAM_COPY . '/phpgroupware/' . $file);
                        command('mount -t ext2 /dev/ram' . $ram_drive_num . ' ' 
. RAM_COPY . '/phpgroupware/' . $file);
                        command('cp -R ' . HARD_COPY . '/phpgroupware/' . $file 
. ' ' . RAM_COPY . '/phpgroupware/' . $file);

                        $ram_drive_num++;
                        echo "\n";
                }
        }