install.php

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<?php
if ( !function_exists( 'version_compare' ) || ( version_compare( phpversion(), '5.3.2' ) < 0 ) ) {
        echo "You are using PHP version " . phpversion() . " but MediaWiki needs PHP 5.3.2 or higher. ABORTING.\n" .
        "Check if you have a newer php executable with a different name, such as php5.\n";
        die( 1 );
}

define( 'MW_CONFIG_CALLBACK', 'Installer::overrideConfig' );
define( 'MEDIAWIKI_INSTALL', true );

require_once( dirname( __DIR__ )."/maintenance/Maintenance.php" );

class CommandLineInstaller extends Maintenance {
        function __construct() {
                parent::__construct();
                global $IP;

                $this->addArg( 'name', 'The name of the wiki', true);

                $this->addArg( 'admin', 'The username of the wiki administrator (WikiSysop)', true );
                $this->addOption( 'pass', 'The password for the wiki administrator.', false, true );
                $this->addOption( 'passfile', 'An alternative way to provide pass option, as the contents of this file', false, true );
                /* $this->addOption( 'email', 'The email for the wiki administrator', false, true ); */
                $this->addOption( 'scriptpath', 'The relative path of the wiki in the web server (/wiki)', false, true );

                $this->addOption( 'lang', 'The language to use (en)', false, true );
                /* $this->addOption( 'cont-lang', 'The content language (en)', false, true ); */

                $this->addOption( 'dbtype', 'The type of database (mysql)', false, true );
                $this->addOption( 'dbserver', 'The database host (localhost)', false, true );
                $this->addOption( 'dbport', 'The database port; only for PostgreSQL (5432)', false, true );
                $this->addOption( 'dbname', 'The database name (my_wiki)', false, true );
                $this->addOption( 'dbpath', 'The path for the SQLite DB (/var/data)', false, true );
                $this->addOption( 'dbprefix', 'Optional database table name prefix', false, true );
                $this->addOption( 'installdbuser', 'The user to use for installing (root)', false, true );
                $this->addOption( 'installdbpass', 'The pasword for the DB user to install as.', false, true );
                $this->addOption( 'dbuser', 'The user to use for normal operations (wikiuser)', false, true );
                $this->addOption( 'dbpass', 'The pasword for the DB user for normal operations', false, true );
                $this->addOption( 'dbpassfile', 'An alternative way to provide dbpass option, as the contents of this file', false, true );
                $this->addOption( 'confpath', "Path to write LocalSettings.php to, default $IP", false, true );
                /* $this->addOption( 'dbschema', 'The schema for the MediaWiki DB in pg (mediawiki)', false, true ); */
                /* $this->addOption( 'namespace', 'The project namespace (same as the name)', false, true ); */
                $this->addOption( 'env-checks', "Run environment checks only, don't change anything" );
        }

        function execute() {
                global $IP, $wgTitle;
                $siteName = isset( $this->mArgs[0] ) ? $this->mArgs[0] : "Don't care"; // Will not be set if used with --env-checks
                $adminName = isset( $this->mArgs[1] ) ? $this->mArgs[1] : null;
                $wgTitle = Title::newFromText( 'Installer script' );

                $dbpassfile = $this->getOption( 'dbpassfile', false );
                if ( $dbpassfile !== false ) {
                        if ( $this->getOption( 'dbpass', false ) !== false ) {
                                $this->error( 'WARNING: You provide the options "dbpass" and "dbpassfile". The content of "dbpassfile" overwrites "dbpass".' );
                        }
                        wfSuppressWarnings();
                        $dbpass = file_get_contents( $dbpassfile );
                        wfRestoreWarnings();
                        if ( $dbpass === false ) {
                                $this->error( "Couldn't open $dbpassfile", true );
                        }
                        $this->mOptions['dbpass'] = trim( $dbpass, "\r\n" );
                }

                $passfile = $this->getOption( 'passfile', false );
                if ( $passfile !== false ) {
                        if ( $this->getOption( 'pass', false ) !== false ) {
                                $this->error( 'WARNING: You provide the options "pass" and "passfile". The content of "passfile" overwrites "pass".' );
                        }
                        wfSuppressWarnings();
                        $pass = file_get_contents( $passfile );
                        wfRestoreWarnings();
                        if ( $pass === false ) {
                                $this->error( "Couldn't open $passfile", true );
                        }
                        $this->mOptions['pass'] = str_replace( array( "\n", "\r" ), "", $pass );
                } elseif ( $this->getOption( 'pass', false ) === false ) {
                        $this->error( 'You need to provide the option "pass" or "passfile"', true );
                }

                $installer =
                        InstallerOverrides::getCliInstaller( $siteName, $adminName, $this->mOptions );

                $status = $installer->doEnvironmentChecks();
                if( $status->isGood() ) {
                        $installer->showMessage( 'config-env-good' );
                } else {
                        $installer->showStatusMessage( $status );
                        return;
                }
                if( !$this->hasOption( 'env-checks' ) ) {
                        $installer->execute();
                        $installer->writeConfigurationFile( $this->getOption( 'confpath', $IP ) );
                }
        }

        function validateParamsAndArgs() {
                if ( !$this->hasOption( 'env-checks' ) ) {
                        parent::validateParamsAndArgs();
                }
        }
}

$maintClass = "CommandLineInstaller";

require_once( RUN_MAINTENANCE_IF_MAIN );