fetchText.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class FetchText extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( "Fetch the raw revision blob from an old_id.\n" .
            "NOTE: Export transformations are NOT applied. " .
            "This is left to backupTextPass.php"
        );
    }

    public function execute() {
        $db = $this->getDB( DB_REPLICA );
        $stdin = $this->getStdin();
        while ( !feof( $stdin ) ) {
            $line = fgets( $stdin );
            if ( $line === false ) {
                // We appear to have lost contact...
                break;
            }
            $textId = intval( $line );
            $text = $this->doGetText( $db, $textId );
            if ( $text === false ) {
                # actual error, not zero-length text
                $textLen = "-1";
            } else {
                $textLen = strlen( $text );
            }
            $this->output( $textId . "\n" . $textLen . "\n" . $text );
        }
    }

    private function doGetText( $db, $id ) {
        $id = intval( $id );
        $row = $db->selectRow( 'text',
            [ 'old_text', 'old_flags' ],
            [ 'old_id' => $id ],
            __METHOD__ );
        $text = Revision::getRevisionText( $row );
        if ( $text === false ) {
            return false;
        }

        return $text;
    }
}

$maintClass = "FetchText";
require_once RUN_MAINTENANCE_IF_MAIN;