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Diffstat (limited to 'maintenance/install-utils.inc')
| -rw-r--r-- | maintenance/install-utils.inc | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/maintenance/install-utils.inc b/maintenance/install-utils.inc new file mode 100644 index 00000000..f2d48e9a --- /dev/null +++ b/maintenance/install-utils.inc @@ -0,0 +1,219 @@ +<?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' ); +} |