SpecialUnlockdb.php

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<?php
class SpecialUnlockdb extends FormSpecialPage {

        public function __construct() {
                parent::__construct( 'Unlockdb', 'siteadmin' );
        }

        public function requiresWrite() {
                return false;
        }

        public function checkExecutePermissions( User $user ) {
                global $wgReadOnlyFile;

                parent::checkExecutePermissions( $user );
                # If the lock file isn't writable, we can do sweet bugger all
                if ( !file_exists( $wgReadOnlyFile ) ) {
                        throw new ErrorPageError( 'lockdb', 'databasenotlocked' );
                }
        }

        protected function getFormFields() {
                return array(
                        'Confirm' => array(
                                'type' => 'toggle',
                                'label-message' => 'unlockconfirm',
                        ),
                );
        }

        protected function alterForm( HTMLForm $form ) {
                $form->setWrapperLegend( false );
                $form->setHeaderText( $this->msg( 'unlockdbtext' )->parseAsBlock() );
                $form->setSubmitTextMsg( 'unlockbtn' );
        }

        public function onSubmit( array $data ) {
                global $wgReadOnlyFile;

                if ( !$data['Confirm'] ) {
                        return Status::newFatal( 'locknoconfirm' );
                }

                wfSuppressWarnings();
                $res = unlink( $wgReadOnlyFile );
                wfRestoreWarnings();

                if ( $res ) {
                        return Status::newGood();
                } else {
                        return Status::newFatal( 'filedeleteerror', $wgReadOnlyFile );
                }
        }

        public function onSuccess() {
                $out = $this->getOutput();
                $out->addSubtitle( $this->msg( 'unlockdbsuccesssub' ) );
                $out->addWikiMsg( 'unlockdbsuccesstext' );
        }
}