maintenance/install-utils.inc

   1 <?php
   2
   3 /**
   4  * This file contains functions used by the install script (config/index.php)
   5  * and maintenance scripts. It is not loaded in normal web requests.
   6  *
   7  * @file
   8  */
   9
  10 function install_version_checks() {
  11         # We dare not turn output buffer _off_ since this will break completely
  12         # if PHP is globally configured to run through a gzip filter.
  13         @ob_implicit_flush( true );
  14
  15         if( !function_exists( 'version_compare' ) ) {
  16                 # version_compare was introduced in 4.1.0
  17                 echo "Your PHP version is much too old; 4.0.x will _not_ work. 5.0.0 or higher is required. ABORTING.\n";
  18                 die( 1 );
  19         }
  20         if( version_compare( phpversion(), '5.0.0' ) < 0 ) {
  21                 echo "PHP 5.0.0 or higher is required. If PHP 5 is available only when \n".
  22    "PHP files have a .php5 extension, please navigate to <a href=\"index.php5\">index.php5</a> \n".
  23    "to continue installation. ABORTING.\n";
  24                 die( 1 );
  25         }
  26
  27         // Test for PHP bug which breaks PHP 5.0.x on 64-bit...
  28         // As of 1.8 this breaks lots of common operations instead
  29         // of just some rare ones like export.
  30         $borked = str_replace( 'a', 'b', array( -1 => -1 ) );
  31         if( !isset( $borked[-1] ) ) {
  32                 echo "PHP 5.0.x is buggy on your 64-bit system; you must upgrade to PHP 5.1.x\n" .
  33                         "or higher. ABORTING. (http://bugs.php.net/bug.php?id=34879 for details)\n";
  34                 die( 1 );
  35         }
  36
  37         $test = new PhpXmlBugTester();
  38         if( !$test->ok ) {
  39                 echo "Your system has a combination of PHP and libxml2 versions which is buggy\n" .
  40                         "and can cause hidden data corruption in MediaWiki and other web apps.\n" .
  41                         "Upgrade to PHP 5.2.9 or later and libxml2 2.7.3 or later!\n" .
  42                         "ABORTING (http://bugs.php.net/bug.php?id=45996 for details).\n";
  43                 die( 1 );
  44         }
  45
  46         $test = new PhpRefCallBugTester;
  47         $ok = false;
  48         call_user_func_array( array( $test, 'test' ), array( &$ok ) );
  49         if ( !$ok ) {
  50                 echo "PHP " . phpversion() . " is not compatible with MediaWiki due to a bug involving\n" .
  51                         "reference parameters to __call. Upgrade to PHP 5.3.2, or downgrade\n" .
  52                         "to PHP 5.3.0. to fix this.\n" .
  53                         "ABORTING (see http://bugs.php.net/bug.php?id=50394 for details)\n";
  54                 die( 1 );
  55         }
  56
  57
  58         global $wgCommandLineMode;
  59         $wgCommandLineMode = true;
  60         umask( 000 );
  61         @set_time_limit( 0 );
  62 }
  63
  64 /**
  65  * Test for PHP+libxml2 bug which breaks XML input subtly with certain versions.
  66  * http://bugs.php.net/bug.php?id=45996
  67  * Known fixed with PHP 5.2.9 + libxml2-2.7.3
  68  */
  69 class PhpXmlBugTester {
  70         private $parsedData = '';
  71         public $ok = false;
  72         public function __construct() {
  73                 $charData = '<b>c</b>';
  74                 $xml = '<a>' . htmlspecialchars( $charData ) . '</a>';
  75
  76                 $parser = xml_parser_create();
  77                 xml_set_character_data_handler( $parser, array( $this, 'chardata' ) );
  78                 $parsedOk = xml_parse($parser, $xml, true);
  79                 $this->ok = $parsedOk && ($this->parsedData == $charData);
  80         }
  81         public function chardata($parser, $data) {
  82                 $this->parsedData .= $data;
  83         }
  84 }
  85
  86 /**
  87  * Test for PHP bug #50394
  88  */
  89 class PhpRefCallBugTester {
  90         function __call( $name, $args ) {
  91                 $args[0] = true;
  92         }
  93 }
  94
  95 function readconsole( $prompt = '' ) {
  96         static $isatty = null;
  97         if ( is_null( $isatty ) ) {
  98                 if ( !function_exists( 'posix_isatty' ) || posix_isatty( 0 /*STDIN*/ ) ) {
  99                         $isatty = true;
 100                 } else {
 101                         $isatty = false;
 102                 }
 103         }
 104
 105         if ( $isatty && function_exists( 'readline' ) ) {
 106                 return readline( $prompt );
 107         } else {
 108                 if ( $isatty ) {
 109                         $st = readlineEmulation( $prompt );
 110                 } else {
 111                         if ( feof( STDIN ) ) {
 112                                 $st = false;
 113                         } else {
 114                                 $st = fgets(STDIN, 1024);
 115                         }
 116                 }
 117                 if ($st === false) return false;
 118                 $resp = trim( $st );
 119                 return $resp;
 120         }
 121 }
 122
 123 function findExecutable( $name ) {
 124         $paths = explode( PATH_SEPARATOR, getenv( "PATH" ) );
 125         foreach( $paths as $path ) {
 126                 $full = $path . DIRECTORY_SEPARATOR . $name;
 127                 if( file_exists( $full ) ) {
 128                         if( wfIsWindows() || is_executable( $full ) ) {
 129                                 return $full;
 130                         }
 131                 }
 132         }
 133         return false;
 134 }
 135
 136 function readlineEmulation( $prompt ) {
 137         $bash = "bash";
 138         if( !wfIsWindows() && findExecutable( $bash ) ) {
 139                 $retval = false;
 140                 $encPrompt = wfEscapeShellArg( $prompt );
 141                 $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
 142                 $encCommand = wfEscapeShellArg( $command );
 143                 $line = wfShellExec( "$bash -c $encCommand", $retval );
 144
 145                 if( $retval == 0 ) {
 146                         return $line;
 147                 } elseif( $retval == 127 ) {
 148                         // Couldn't execute bash even though we thought we saw it.
 149                         // Shell probably spit out an error message, sorry :(
 150                         // Fall through to fgets()...
 151                 } else {
 152                         // EOF/ctrl+D
 153                         return false;
 154                 }
 155         }
 156
 157         // Fallback... we'll have no editing controls, EWWW
 158         if ( feof( STDIN ) ) {
 159                 return false;
 160         }
 161         print $prompt;
 162         return fgets(STDIN, 1024);
 163 }
 164
 165
 166 #
 167 # Read and execute SQL commands from a file
 168 #
 169 function dbsource( $fname, $db = false ) {
 170         wfDeprecated( __METHOD__ );
 171         if ( !$db ) {
 172                 // Try $wgDatabase, which is used in the install and update scripts
 173                 global $wgDatabase;
 174                 if ( isset( $wgDatabase ) ) {
 175                         $db = $wgDatabase;
 176                 } else {
 177                         // No? Well, we must be outside of those scripts, so use the standard method
 178                         $db = wfGetDB( DB_MASTER );
 179                 }
 180         }
 181         $error = $db->sourceFile( $fname );
 182         if ( $error !== true ) {
 183                 print $error;
 184                 exit(1);
 185         }
 186 }
 187
 188 /**
 189  * Get the value of session.save_path
 190  *
 191  * Per http://www.php.net/manual/en/ref.session.php#ini.session.save-path,
 192  * this might have some additional preceding parts which need to be
 193  * ditched
 194  *
 195  * @return string
 196  */
 197 function mw_get_session_save_path() {
 198         $path = ini_get( 'session.save_path' );
 199         $path = substr( $path, strrpos( $path, ';' ) );
 200         return $path;
 201 }
 202
 203 /**
 204  * Is dl() available to us?
 205  *
 206  * According to http://www.php.net/manual/en/function.dl.php, dl()
 207  * is *not* available when `enable_dl` is off, or under `safe_mode`
 208  *
 209  * @return bool
 210  */
 211 function mw_have_dl() {
 212         return function_exists( 'dl' )
 213                 && is_callable( 'dl' )
 214                 && wfIniGetBool( 'enable_dl' )
 215                 && !wfIniGetBool( 'safe_mode' );
 216 }