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<?php
/**
* This file contains functions used by the install script (config/index.php)
* and maintenance scripts. It is not loaded in normal web requests.
*
* @file
*/
function install_version_checks() {
# We dare not turn output buffer _off_ since this will break completely
# if PHP is globally configured to run through a gzip filter.
@ob_implicit_flush( true );
if( !function_exists( 'version_compare' ) ) {
# version_compare was introduced in 4.1.0
echo "Your PHP version is much too old; 4.0.x will _not_ work. 5.1.0 or higher is required. ABORTING.\n";
die( 1 );
}
if( version_compare( phpversion(), '5.1.0' ) < 0 ) {
echo "PHP 5.1.0 or higher is required. If PHP 5 is available only when \n".
"PHP files have a .php5 extension, please navigate to <a href=\"index.php5\">index.php5</a> \n".
"to continue installation. ABORTING.\n";
die( 1 );
}
$test = new PhpXmlBugTester();
if( !$test->ok ) {
echo "Your system has a combination of PHP and libxml2 versions which is buggy\n" .
"and can cause hidden data corruption in MediaWiki and other web apps.\n" .
"Upgrade to PHP 5.2.9 or later and libxml2 2.7.3 or later!\n" .
"ABORTING (http://bugs.php.net/bug.php?id=45996 for details).\n";
die( 1 );
}
$test = new PhpRefCallBugTester;
$test->execute();
if ( !$test->ok ) {
echo "PHP 5.3.1 is not compatible with MediaWiki due to a bug involving\n" .
"reference parameters to __call. Upgrade to PHP 5.3.2 or higher, or \n" .
"downgrade to PHP 5.3.0 to fix this.\n" .
"ABORTING (see http://bugs.php.net/bug.php?id=50394 for details)\n";
die( 1 );
}
global $wgCommandLineMode;
$wgCommandLineMode = true;
umask( 000 );
@set_time_limit( 0 );
}
/**
* Test for PHP+libxml2 bug which breaks XML input subtly with certain versions.
* http://bugs.php.net/bug.php?id=45996
* Known fixed with PHP 5.2.9 + libxml2-2.7.3
*/
class PhpXmlBugTester {
private $parsedData = '';
public $ok = false;
public function __construct() {
$charData = '<b>c</b>';
$xml = '<a>' . htmlspecialchars( $charData ) . '</a>';
$parser = xml_parser_create();
xml_set_character_data_handler( $parser, array( $this, 'chardata' ) );
$parsedOk = xml_parse($parser, $xml, true);
$this->ok = $parsedOk && ($this->parsedData == $charData);
}
public function chardata($parser, $data) {
$this->parsedData .= $data;
}
}
/**
* Test for PHP bug #50394 (PHP 5.3.x conversion to null only, not 5.2.x)
*/
class PhpRefCallBugTester {
public $ok = false;
function __call( $name, $args ) {
$old = error_reporting( E_ALL & ~E_WARNING );
call_user_func_array( array( $this, 'checkForBrokenRef' ), $args );
error_reporting( $old );
}
function checkForBrokenRef( &$var ) {
if ( $var ) {
$this->ok = true;
}
}
function execute() {
$var = true;
call_user_func_array( array( $this, 'foo' ), array( &$var ) );
}
}
function readconsole( $prompt = '' ) {
static $isatty = null;
if ( is_null( $isatty ) ) {
if ( !function_exists( 'posix_isatty' ) || posix_isatty( 0 /*STDIN*/ ) ) {
$isatty = true;
} else {
$isatty = false;
}
}
if ( $isatty && function_exists( 'readline' ) ) {
return readline( $prompt );
} else {
if ( $isatty ) {
$st = readlineEmulation( $prompt );
} else {
if ( feof( STDIN ) ) {
$st = false;
} else {
$st = fgets(STDIN, 1024);
}
}
if ($st === false) return false;
$resp = trim( $st );
return $resp;
}
}
function findExecutable( $name ) {
$paths = explode( PATH_SEPARATOR, getenv( "PATH" ) );
foreach( $paths as $path ) {
$full = $path . DIRECTORY_SEPARATOR . $name;
if( file_exists( $full ) ) {
if( wfIsWindows() || is_executable( $full ) ) {
return $full;
}
}
}
return false;
}
function readlineEmulation( $prompt ) {
$bash = "bash";
if( !wfIsWindows() && findExecutable( $bash ) ) {
$retval = false;
$encPrompt = wfEscapeShellArg( $prompt );
$command = "read -er -p $encPrompt && echo \"\$REPLY\"";
$encCommand = wfEscapeShellArg( $command );
$line = wfShellExec( "$bash -c $encCommand", $retval );
if( $retval == 0 ) {
return $line;
} elseif( $retval == 127 ) {
// Couldn't execute bash even though we thought we saw it.
// Shell probably spit out an error message, sorry :(
// Fall through to fgets()...
} else {
// EOF/ctrl+D
return false;
}
}
// Fallback... we'll have no editing controls, EWWW
if ( feof( STDIN ) ) {
return false;
}
print $prompt;
return fgets(STDIN, 1024);
}
#
# Read and execute SQL commands from a file
#
function dbsource( $fname, $db = false ) {
wfDeprecated( __METHOD__ );
if ( !$db ) {
// Try $wgDatabase, which is used in the install and update scripts
global $wgDatabase;
if ( isset( $wgDatabase ) ) {
$db = $wgDatabase;
} else {
// No? Well, we must be outside of those scripts, so use the standard method
$db = wfGetDB( DB_MASTER );
}
}
$error = $db->sourceFile( $fname );
if ( $error !== true ) {
print $error;
exit(1);
}
}
/**
* Get the value of session.save_path
*
* Per http://www.php.net/manual/en/ref.session.php#ini.session.save-path,
* this might have some additional preceding parts which need to be
* ditched
*
* @return string
*/
function mw_get_session_save_path() {
$path = ini_get( 'session.save_path' );
$path = substr( $path, strrpos( $path, ';' ) );
return $path;
}
/**
* Is dl() available to us?
*
* According to http://www.php.net/manual/en/function.dl.php, dl()
* is *not* available when `enable_dl` is off, or under `safe_mode`
*
* @return bool
*/
function mw_have_dl() {
return function_exists( 'dl' )
&& is_callable( 'dl' )
&& wfIniGetBool( 'enable_dl' )
&& !wfIniGetBool( 'safe_mode' );
}