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<?php
/**
 * Delete archived (non-current) files from the database
 *
 * Based on deleteOldRevisions.php by Rob Church.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance
 */
use MediaWiki\MediaWikiServices;
require_once __DIR__ . '/Maintenance.php';
/**
 * Maintenance script to delete archived (non-current) files from the database.
 *
 * @ingroup Maintenance
 */
class DeleteArchivedFiles extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Deletes all archived images.' );
        $this->addOption( 'delete', 'Perform the deletion' );
        $this->addOption( 'force', 'Force deletion of rows from filearchive' );
    }
    public function execute() {
        if ( !$this->hasOption( 'delete' ) ) {
            $this->output( "Use --delete to actually confirm this script\n" );
            return;
        }
        # Data should come off the master, wrapped in a transaction
        $dbw = $this->getDB( DB_MASTER );
        $this->beginTransaction( $dbw, __METHOD__ );
        $repo = MediaWikiServices::getInstance()->getRepoGroup()->getLocalRepo();
        # Get "active" revisions from the filearchive table
        $this->output( "Searching for and deleting archived files...\n" );
        $res = $dbw->select(
            'filearchive',
            [ 'fa_id', 'fa_storage_group', 'fa_storage_key', 'fa_sha1', 'fa_name' ],
            '',
            __METHOD__
        );
        $count = 0;
        foreach ( $res as $row ) {
            $key = $row->fa_storage_key;
            if ( !strlen( $key ) ) {
                $this->output( "Entry with ID {$row->fa_id} has empty key, skipping\n" );
                continue;
            }
            $file = $repo->newFile( $row->fa_name );
            try {
                $file->lock();
            } catch ( LocalFileLockError $e ) {
                $this->error( "Could not acquire lock on '{$row->fa_name}', skipping\n" );
                continue;
            }
            $group = $row->fa_storage_group;
            $id = $row->fa_id;
            $path = $repo->getZonePath( 'deleted' ) .
                '/' . $repo->getDeletedHashPath( $key ) . $key;
            if ( isset( $row->fa_sha1 ) ) {
                $sha1 = $row->fa_sha1;
            } else {
                // old row, populate from key
                $sha1 = LocalRepo::getHashFromKey( $key );
            }
            // Check if the file is used anywhere...
            $inuse = $dbw->selectField(
                'oldimage',
                '1',
                [
                    'oi_sha1' => $sha1,
                    $dbw->bitAnd( 'oi_deleted', File::DELETED_FILE ) => File::DELETED_FILE
                ],
                __METHOD__,
                [ 'FOR UPDATE' ]
            );
            $needForce = true;
            if ( !$repo->fileExists( $path ) ) {
                $this->output( "Notice - file '$key' not found in group '$group'\n" );
            } elseif ( $inuse ) {
                $this->output( "Notice - file '$key' is still in use\n" );
            } elseif ( !$repo->quickPurge( $path ) ) {
                $this->output( "Unable to remove file $path, skipping\n" );
                $file->unlock();
                // don't delete even with --force
                continue;
            } else {
                $needForce = false;
            }
            if ( $needForce ) {
                if ( $this->hasOption( 'force' ) ) {
                    $this->output( "Got --force, deleting DB entry\n" );
                } else {
                    $file->unlock();
                    continue;
                }
            }
            $count++;
            $dbw->delete( 'filearchive', [ 'fa_id' => $id ], __METHOD__ );
            $file->unlock();
        }
        $this->commitTransaction( $dbw, __METHOD__ );
        $this->output( "Done! [$count file(s)]\n" );
    }
}
$maintClass = DeleteArchivedFiles::class;
require_once RUN_MAINTENANCE_IF_MAIN;