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         global $wgCommandLineMode;
  38         $wgCommandLineMode = true;
  39         umask( 000 );
  40         @set_time_limit( 0 );
  41 }
  42
  43 function readconsole( $prompt = '' ) {
  44         static $isatty = null;
  45         if ( is_null( $isatty ) ) {
  46                 if ( !function_exists( 'posix_isatty' ) || posix_isatty( 0 /*STDIN*/ ) ) {
  47                         $isatty = true;
  48                 } else {
  49                         $isatty = false;
  50                 }
  51         }
  52
  53         if ( $isatty && function_exists( 'readline' ) ) {
  54                 return readline( $prompt );
  55         } else {
  56                 if ( $isatty ) {
  57                         $st = readlineEmulation( $prompt );
  58                 } else {
  59                         if ( feof( STDIN ) ) {
  60                                 $st = false;
  61                         } else {
  62                                 $st = fgets(STDIN, 1024);
  63                         }
  64                 }
  65                 if ($st === false) return false;
  66                 $resp = trim( $st );
  67                 return $resp;
  68         }
  69 }
  70
  71 function findExecutable( $name ) {
  72         $paths = explode( PATH_SEPARATOR, getenv( "PATH" ) );
  73         foreach( $paths as $path ) {
  74                 $full = $path . DIRECTORY_SEPARATOR . $name;
  75                 if( file_exists( $full ) ) {
  76                         if( wfIsWindows() || is_executable( $full ) ) {
  77                                 return $full;
  78                         }
  79                 }
  80         }
  81         return false;
  82 }
  83
  84 function readlineEmulation( $prompt ) {
  85         $bash = "bash";
  86         if( !wfIsWindows() && findExecutable( $bash ) ) {
  87                 $retval = false;
  88                 $encPrompt = wfEscapeShellArg( $prompt );
  89                 $command = "read -er -p $encPrompt && echo \"\$REPLY\"";
  90                 $encCommand = wfEscapeShellArg( $command );
  91                 $line = wfShellExec( "$bash -c $encCommand", $retval );
  92
  93                 if( $retval == 0 ) {
  94                         return $line;
  95                 } elseif( $retval == 127 ) {
  96                         // Couldn't execute bash even though we thought we saw it.
  97                         // Shell probably spit out an error message, sorry :(
  98                         // Fall through to fgets()...
  99                 } else {
 100                         // EOF/ctrl+D
 101                         return false;
 102                 }
 103         }
 104
 105         // Fallback... we'll have no editing controls, EWWW
 106         if ( feof( STDIN ) ) {
 107                 return false;
 108         }
 109         print $prompt;
 110         return fgets(STDIN, 1024);
 111 }
 112
 113
 114 #
 115 # Read and execute SQL commands from a file
 116 #
 117 function dbsource( $fname, $db = false ) {
 118         wfDeprecated( __METHOD__ );
 119         if ( !$db ) {
 120                 // Try $wgDatabase, which is used in the install and update scripts
 121                 global $wgDatabase;
 122                 if ( isset( $wgDatabase ) ) {
 123                         $db = $wgDatabase;
 124                 } else {
 125                         // No? Well, we must be outside of those scripts, so use the standard method
 126                         $db = wfGetDB( DB_MASTER );
 127                 }
 128         }
 129         $error = $db->sourceFile( $fname );
 130         if ( $error !== true ) {
 131                 print $error;
 132                 exit(1);
 133         }
 134 }
 135
 136 /**
 137  * Get the value of session.save_path
 138  *
 139  * Per http://www.php.net/manual/en/ref.session.php#ini.session.save-path,
 140  * this might have some additional preceding parts which need to be
 141  * ditched
 142  *
 143  * @return string
 144  */
 145 function mw_get_session_save_path() {
 146         $path = ini_get( 'session.save_path' );
 147         $path = substr( $path, strrpos( $path, ';' ) );
 148         return $path;
 149 }
 150
 151 /**
 152  * Is dl() available to us?
 153  *
 154  * According to http://www.php.net/manual/en/function.dl.php, dl()
 155  * is *not* available when `enable_dl` is off, or under `safe_mode`
 156  *
 157  * @return bool
 158  */
 159 function mw_have_dl() {
 160         return function_exists( 'dl' )
 161                 && is_callable( 'dl' )
 162                 && wfIniGetBool( 'enable_dl' )
 163                 && !wfIniGetBool( 'safe_mode' );
 164 }