resolveStubs.php

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<?php
if ( !defined( 'MEDIAWIKI' ) ) {
    $optionsWithArgs = [ 'm' ];

    require_once __DIR__ . '/../commandLine.inc';

    resolveStubs();
}

function resolveStubs() {
    $fname = 'resolveStubs';

    $dbr = wfGetDB( DB_REPLICA );
    $maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
    $blockSize = 10000;
    $numBlocks = intval( $maxID / $blockSize ) + 1;

    for ( $b = 0; $b < $numBlocks; $b++ ) {
        wfWaitForSlaves();

        printf( "%5.2f%%\n", $b / $numBlocks * 100 );
        $start = intval( $maxID / $numBlocks ) * $b + 1;
        $end = intval( $maxID / $numBlocks ) * ( $b + 1 );

        $res = $dbr->select( 'text', [ 'old_id', 'old_text', 'old_flags' ],
            "old_id>=$start AND old_id<=$end " .
            "AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' " .
            'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
            $fname );
        foreach ( $res as $row ) {
            resolveStub( $row->old_id, $row->old_text, $row->old_flags );
        }
    }
    print "100%\n";
}

function resolveStub( $id, $stubText, $flags ) {
    $fname = 'resolveStub';

    $stub = unserialize( $stubText );
    $flags = explode( ',', $flags );

    $dbr = wfGetDB( DB_REPLICA );
    $dbw = wfGetDB( DB_MASTER );

    if ( strtolower( get_class( $stub ) ) !== 'historyblobstub' ) {
        print "Error found object of class " . get_class( $stub ) . ", expecting historyblobstub\n";

        return;
    }

    # Get the (maybe) external row
    $externalRow = $dbr->selectRow(
        'text',
        [ 'old_text' ],
        [
            'old_id' => $stub->mOldId,
            'old_flags' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() )
        ],
        $fname
    );

    if ( !$externalRow ) {
        # Object wasn't external
        return;
    }

    # Preserve the legacy encoding flag, but switch from object to external
    if ( in_array( 'utf-8', $flags ) ) {
        $newFlags = 'external,utf-8';
    } else {
        $newFlags = 'external';
    }

    # Update the row
    # print "oldid=$id\n";
    $dbw->update( 'text',
        [ /* SET */
            'old_flags' => $newFlags,
            'old_text' => $externalRow->old_text . '/' . $stub->mHash
        ],
        [ /* WHERE */
            'old_id' => $id
        ], $fname
    );
}