maintenance/eval.php

   1 <?php
   2 /**
   3  * This script lets a command-line user start up the wiki engine and then poke
   4  * about by issuing PHP commands directly.
   5  *
   6  * Unlike eg Python, you need to use a 'return' statement explicitly for the
   7  * interactive shell to print out the value of the expression. Multiple lines
   8  * are evaluated separately, so blocks need to be input without a line break.
   9  * Fatal errors such as use of undeclared functions can kill the shell.
  10  *
  11  * To get decent line editing behavior, you should compile PHP with support
  12  * for GNU readline (pass --with-readline to configure).
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along
  25  * with this program; if not, write to the Free Software Foundation, Inc.,
  26  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  27  * http://www.gnu.org/copyleft/gpl.html
  28  *
  29  * @file
  30  * @ingroup Maintenance
  31  */
  32
  33 $optionsWithArgs = array( 'd' );
  34
  35 /** */
  36 require_once __DIR__ . "/commandLine.inc";
  37
  38 if ( isset( $options['d'] ) ) {
  39         $d = $options['d'];
  40         if ( $d > 0 ) {
  41                 $wgDebugLogFile = '/dev/stdout';
  42         }
  43         if ( $d > 1 ) {
  44                 $lb = wfGetLB();
  45                 $serverCount = $lb->getServerCount();
  46                 for ( $i = 0; $i < $serverCount; $i++ ) {
  47                         $server = $lb->getServerInfo( $i );
  48                         $server['flags'] |= DBO_DEBUG;
  49                         $lb->setServerInfo( $i, $server );
  50                 }
  51         }
  52 }
  53
  54 $__useReadline = function_exists( 'readline_add_history' )
  55         && Maintenance::posix_isatty( 0 /*STDIN*/ );
  56
  57 if ( $__useReadline ) {
  58         $__historyFile = isset( $_ENV['HOME'] ) ?
  59                 "{$_ENV['HOME']}/.mweval_history" : "$IP/maintenance/.mweval_history";
  60         readline_read_history( $__historyFile );
  61 }
  62
  63 $__phpPath = preg_match( '/Zend Engine|HipHop VM/', wfShellExecWithStderr( 'php --version' ) )
  64         ? 'php' //standard system path name
  65         : ''; // not accessible somehow
  66
  67 $__multiLine = '';
  68 $__e = null; // PHP exception
  69 while ( ( $__line = Maintenance::readconsole() ) !== false ) {
  70         if ( $__e && !preg_match( '/^(exit|die);?$/', $__line ) ) {
  71                 // Internal state may be corrupted or fatals may occur later due
  72                 // to some object not being set. Don't drop out of eval in case
  73                 // lines were being pasted in (which would then get dumped to the shell).
  74                 // Instead, just absorb the remaning commands. Let "exit" through per DWIM.
  75                 echo "Exception was thrown before; please restart eval.php\n";
  76                 continue;
  77         }
  78         if ( $__useReadline ) {
  79                 readline_add_history( $__line );
  80                 readline_write_history( $__historyFile );
  81         }
  82         // Try to only run PHP once a valid chunk is formed (deals with newlines)
  83         if ( $__phpPath ) {
  84                 $res = wfShellExecWithStderr(
  85                         "echo " . wfEscapeShellArg( "<?php\n{$__multiLine}{$__line}" ) . " | php -l" );
  86                 if ( strpos( $res, 'No syntax errors' ) !== 0 && substr( $__multiLine, -2 ) !== "\n\n" ) {
  87                         $__multiLine .= "$__line\n";
  88                         continue;
  89                 }
  90         }
  91         try {
  92                 $__val = eval( $__multiLine . $__line . ";" );
  93                 $__multiLine = '';
  94         } catch ( Exception $__e ) {
  95                 echo "Caught exception " . get_class( $__e ) .
  96                         ": {$__e->getMessage()}\n" . $__e->getTraceAsString() . "\n";
  97                 continue;
  98         }
  99         if ( wfIsHHVM() || is_null( $__val ) ) {
 100                 echo "\n";
 101         } elseif ( is_string( $__val ) || is_numeric( $__val ) ) {
 102                 echo "$__val\n";
 103         } else {
 104                 var_dump( $__val );
 105         }
 106 }
 107
 108 print "\n";