wikimedia / mediawiki

maintenance/migrateFileRepoLayout.php

<?php

For compatibility and reusability of your code, PSR1 recommends that a file should introduce either new symbols (like classes, functions, etc.) or have side-effects (like outputting something, or including other files), but not both at the same time. The first symbol is defined on line 33 and the first side effect is on line 24.

/**
 * Copy all files in FileRepo to an originals container using SHA1 paths.
 *
 * 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
 */

require_once __DIR__ . '/Maintenance.php';

/**
 * Copy all files in FileRepo to an originals container using SHA1 paths.
 *
 * This script should be run while the repo is still set to the old layout.
 *
 * @ingroup Maintenance
 */
class MigrateFileRepoLayout extends Maintenance {
	public function __construct() {
		parent::__construct();
		$this->addDescription( 'Copy files in repo to a different layout.' );
		$this->addOption( 'oldlayout', "Old layout; one of 'name' or 'sha1'", true, true );
		$this->addOption( 'newlayout', "New layout; one of 'name' or 'sha1'", true, true );
		$this->addOption( 'since', "Copy only files from after this timestamp", false, true );
		$this->setBatchSize( 50 );
	}

	public function execute() {
		$oldLayout = $this->getOption( 'oldlayout' );
		if ( !in_array( $oldLayout, [ 'name', 'sha1' ] ) ) {
			$this->error( "Invalid old layout.", 1 );
		}
		$newLayout = $this->getOption( 'newlayout' );
		if ( !in_array( $newLayout, [ 'name', 'sha1' ] ) ) {
			$this->error( "Invalid new layout.", 1 );
		}
		$since = $this->getOption( 'since' );

		$repo = $this->getRepo();

		$be = $repo->getBackend();
		if ( $be instanceof FileBackendDBRepoWrapper ) {
			$be = $be->getInternalBackend(); // avoid path translations for this script
		}

		$dbw = $repo->getMasterDB();

		$origBase = $be->getContainerStoragePath( "{$repo->getName()}-original" );
		$startTime = wfTimestampNow();

		// Do current and archived versions...
		$conds = [];
		if ( $since ) {
			$conds[] = 'img_timestamp >= ' . $dbw->addQuotes( $dbw->timestamp( $since ) );
		}

		$batch = [];
		$lastName = '';
		do {
			$res = $dbw->select( 'image',
				[ 'img_name', 'img_sha1' ],
				array_merge( [ 'img_name > ' . $dbw->addQuotes( $lastName ) ], $conds ),
				__METHOD__,
				[ 'LIMIT' => $this->mBatchSize, 'ORDER BY' => 'img_name' ]
			);

			foreach ( $res as $row ) {
				$lastName = $row->img_name;
				/** @var LocalFile $file */
				$file = $repo->newFile( $row->img_name );
				// Check in case SHA1 rows are not populated for some files
				$sha1 = strlen( $row->img_sha1 ) ? $row->img_sha1 : $file->getSha1();

				if ( !strlen( $sha1 ) ) {
					$this->error( "Image SHA-1 not known for {$row->img_name}." );
				} else {
					if ( $oldLayout === 'sha1' ) {
						$spath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
					} else {
						$spath = $file->getPath();
					}

					if ( $newLayout === 'sha1' ) {
						$dpath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
					} else {
						$dpath = $file->getPath();
					}

					$status = $be->prepare( [
						'dir' => dirname( $dpath ), 'bypassReadOnly' => 1 ] );
					if ( !$status->isOK() ) {
						$this->error( print_r( $status->getErrors(), true ) );
					}

					$batch[] = [ 'op' => 'copy', 'overwrite' => true,
						'src' => $spath, 'dst' => $dpath, 'img' => $row->img_name ];
				}

				foreach ( $file->getHistory() as $ofile ) {
					$sha1 = $ofile->getSha1();
					if ( !strlen( $sha1 ) ) {
						$this->error( "Image SHA-1 not set for {$ofile->getArchiveName()}." );
						continue;
					}

					if ( $oldLayout === 'sha1' ) {
						$spath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
					} elseif ( $ofile->isDeleted( File::DELETED_FILE ) ) {
						$spath = $be->getContainerStoragePath( "{$repo->getName()}-deleted" ) .
							'/' . $repo->getDeletedHashPath( $sha1 ) .
							$sha1 . '.' . $ofile->getExtension();
					} else {
						$spath = $ofile->getPath();
					}

					if ( $newLayout === 'sha1' ) {
						$dpath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
					} else {
						$dpath = $ofile->getPath();
					}

					$status = $be->prepare( [
						'dir' => dirname( $dpath ), 'bypassReadOnly' => 1 ] );
					if ( !$status->isOK() ) {
						$this->error( print_r( $status->getErrors(), true ) );
					}
					$batch[] = [ 'op' => 'copy', 'overwrite' => true,
						'src' => $spath, 'dst' => $dpath, 'img' => $ofile->getArchiveName() ];
				}

				if ( count( $batch ) >= $this->mBatchSize ) {
					$this->runBatch( $batch, $be );
					$batch = [];
				}
			}
		} while ( $res->numRows() );

		if ( count( $batch ) ) {
			$this->runBatch( $batch, $be );
		}

		// Do deleted versions...
		$conds = [];
		if ( $since ) {
			$conds[] = 'fa_deleted_timestamp >= ' . $dbw->addQuotes( $dbw->timestamp( $since ) );
		}

		$batch = [];
		$lastId = 0;
		do {
			$res = $dbw->select( 'filearchive', [ 'fa_storage_key', 'fa_id', 'fa_name' ],
				array_merge( [ 'fa_id > ' . $dbw->addQuotes( $lastId ) ], $conds ),
				__METHOD__,
				[ 'LIMIT' => $this->mBatchSize, 'ORDER BY' => 'fa_id' ]
			);

			foreach ( $res as $row ) {
				$lastId = $row->fa_id;
				$sha1Key = $row->fa_storage_key;
				if ( !strlen( $sha1Key ) ) {
					$this->error( "Image SHA-1 not set for file #{$row->fa_id} (deleted)." );
					continue;
				}
				$sha1 = substr( $sha1Key, 0, strpos( $sha1Key, '.' ) );

				if ( $oldLayout === 'sha1' ) {
					$spath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
				} else {
					$spath = $be->getContainerStoragePath( "{$repo->getName()}-deleted" ) .
						'/' . $repo->getDeletedHashPath( $sha1Key ) . $sha1Key;
				}

				if ( $newLayout === 'sha1' ) {
					$dpath = "{$origBase}/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
				} else {
					$dpath = $be->getContainerStoragePath( "{$repo->getName()}-deleted" ) .
						'/' . $repo->getDeletedHashPath( $sha1Key ) . $sha1Key;
				}

				$status = $be->prepare( [
					'dir' => dirname( $dpath ), 'bypassReadOnly' => 1 ] );
				if ( !$status->isOK() ) {
					$this->error( print_r( $status->getErrors(), true ) );
				}

				$batch[] = [ 'op' => 'copy', 'src' => $spath, 'dst' => $dpath,
					'overwriteSame' => true, 'img' => "(ID {$row->fa_id}) {$row->fa_name}" ];

				if ( count( $batch ) >= $this->mBatchSize ) {
					$this->runBatch( $batch, $be );
					$batch = [];
				}
			}
		} while ( $res->numRows() );

		if ( count( $batch ) ) {
			$this->runBatch( $batch, $be );
		}

		$this->output( "Done (started $startTime)\n" );
	}

	protected function getRepo() {
		return RepoGroup::singleton()->getLocalRepo();
	}

	protected function runBatch( array $ops, FileBackend $be ) {
		$this->output( "Migrating file batch:\n" );
		foreach ( $ops as $op ) {
			$this->output( "\"{$op['img']}\" (dest: {$op['dst']})\n" );
		}

		$status = $be->doOperations( $ops, [ 'bypassReadOnly' => 1 ] );
		if ( !$status->isOK() ) {
			$this->output( print_r( $status->getErrors(), true ) );
		}

		$this->output( "Batch done\n\n" );
	}
}

$maintClass = 'MigrateFileRepoLayout';
require_once RUN_MAINTENANCE_IF_MAIN;