dumpRev.php

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

class DumpRev extends Maintenance {
        public function __construct() {
                parent::__construct();
                $this->addArg( 'rev-id', 'Revision ID', true );
        }

        public function execute() {
                $dbr = wfGetDB( DB_SLAVE );
                $row = $dbr->selectRow(
                        array( 'text', 'revision' ),
                        array( 'old_flags', 'old_text' ),
                        array( 'old_id=rev_text_id', 'rev_id' => $this->getArg() )
                );
                if ( !$row ) {
                        $this->error( "Row not found", true );
                }

                $flags = explode( ',',  $row->old_flags );
                $text = $row->old_text;
                if ( in_array( 'external', $flags ) ) {
                        $this->output( "External $text\n" );
                        if ( preg_match( '!^DB://(\w+)/(\w+)/(\w+)$!', $text, $m ) ) {
                                $es = ExternalStore::getStoreObject( 'DB' );
                                $blob = $es->fetchBlob( $m[1], $m[2], $m[3] );
                                if ( strtolower( get_class( $blob ) ) == 'concatenatedgziphistoryblob' ) {
                                        $this->output( "Found external CGZ\n" );
                                        $blob->uncompress();
                                        $this->output( "Items: (" . implode( ', ', array_keys( $blob->mItems ) ) . ")\n" );
                                        $text = $blob->getItem( $m[3] );
                                } else {
                                        $this->output( "CGZ expected at $text, got " . gettype( $blob ) . "\n" );
                                        $text = $blob;
                                }
                        } else {
                                $this->output( "External plain $text\n" );
                                $text = ExternalStore::fetchFromURL( $text );
                        }
                }
                if ( in_array( 'gzip', $flags ) ) {
                        $text = gzinflate( $text );
                }
                if ( in_array( 'object', $flags ) ) {
                        $obj = unserialize( $text );
                        $text = $obj->getText();
                }

                if ( is_object( $text ) ) {
                        $this->error( "Unexpectedly got object of type: " . get_class( $text ) );
                } else {
                        $this->output( "Text length: " . strlen( $text ) . "\n" );
                        $this->output( substr( $text, 0, 100 ) . "\n" );
                }
        }
}

$maintClass = "DumpRev";
require_once( RUN_MAINTENANCE_IF_MAIN );