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799 lines
25 KiB
PHP
799 lines
25 KiB
PHP
<?php
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/**
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* Helper class for representing operations with transaction support.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup FileBackend
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* @author Aaron Schulz
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*/
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/**
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* FileBackend helper class for representing operations.
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* Do not use this class from places outside FileBackend.
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*
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* Methods called from FileOpBatch::attempt() should avoid throwing
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* exceptions at all costs. FileOp objects should be lightweight in order
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* to support large arrays in memory and serialization.
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*
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* @ingroup FileBackend
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* @since 1.19
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*/
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abstract class FileOp {
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/** @var Array */
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protected $params = array();
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/** @var FileBackendStore */
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protected $backend;
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protected $state = self::STATE_NEW; // integer
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protected $failed = false; // boolean
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protected $async = false; // boolean
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protected $batchId; // string
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protected $doOperation = true; // boolean; operation is not a no-op
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protected $sourceSha1; // string
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protected $overwriteSameCase; // boolean
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protected $destExists; // boolean
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/* Object life-cycle */
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const STATE_NEW = 1;
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const STATE_CHECKED = 2;
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const STATE_ATTEMPTED = 3;
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/**
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* Build a new batch file operation transaction
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*
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* @param FileBackendStore $backend
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* @param Array $params
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* @throws MWException
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*/
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final public function __construct( FileBackendStore $backend, array $params ) {
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$this->backend = $backend;
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list( $required, $optional ) = $this->allowedParams();
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// @todo normalizeAnyStoragePaths() calls are overzealous, use a parameter list
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foreach ( $required as $name ) {
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if ( isset( $params[$name] ) ) {
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// Normalize paths so the paths to the same file have the same string
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$this->params[$name] = self::normalizeAnyStoragePaths( $params[$name] );
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} else {
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throw new MWException( "File operation missing parameter '$name'." );
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}
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}
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foreach ( $optional as $name ) {
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if ( isset( $params[$name] ) ) {
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// Normalize paths so the paths to the same file have the same string
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$this->params[$name] = self::normalizeAnyStoragePaths( $params[$name] );
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}
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}
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$this->params = $params;
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}
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/**
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* Normalize $item or anything in $item that is a valid storage path
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*
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* @param string $item|array
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* @return string|Array
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*/
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protected function normalizeAnyStoragePaths( $item ) {
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if ( is_array( $item ) ) {
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$res = array();
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foreach ( $item as $k => $v ) {
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$k = self::normalizeIfValidStoragePath( $k );
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$v = self::normalizeIfValidStoragePath( $v );
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$res[$k] = $v;
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}
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return $res;
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} else {
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return self::normalizeIfValidStoragePath( $item );
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}
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}
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/**
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* Normalize a string if it is a valid storage path
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*
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* @param string $path
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* @return string
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*/
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protected static function normalizeIfValidStoragePath( $path ) {
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if ( FileBackend::isStoragePath( $path ) ) {
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$res = FileBackend::normalizeStoragePath( $path );
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return ( $res !== null ) ? $res : $path;
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}
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return $path;
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}
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/**
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* Set the batch UUID this operation belongs to
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*
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* @param string $batchId
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* @return void
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*/
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final public function setBatchId( $batchId ) {
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$this->batchId = $batchId;
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}
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/**
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* Get the value of the parameter with the given name
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*
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* @param string $name
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* @return mixed Returns null if the parameter is not set
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*/
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final public function getParam( $name ) {
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return isset( $this->params[$name] ) ? $this->params[$name] : null;
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}
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/**
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* Check if this operation failed precheck() or attempt()
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*
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* @return bool
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*/
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final public function failed() {
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return $this->failed;
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}
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/**
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* Get a new empty predicates array for precheck()
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*
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* @return Array
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*/
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final public static function newPredicates() {
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return array( 'exists' => array(), 'sha1' => array() );
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}
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/**
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* Get a new empty dependency tracking array for paths read/written to
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*
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* @return Array
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*/
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final public static function newDependencies() {
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return array( 'read' => array(), 'write' => array() );
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}
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/**
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* Update a dependency tracking array to account for this operation
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*
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* @param array $deps Prior path reads/writes; format of FileOp::newPredicates()
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* @return Array
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*/
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final public function applyDependencies( array $deps ) {
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$deps['read'] += array_fill_keys( $this->storagePathsRead(), 1 );
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$deps['write'] += array_fill_keys( $this->storagePathsChanged(), 1 );
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return $deps;
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}
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/**
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* Check if this operation changes files listed in $paths
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*
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* @param array $paths Prior path reads/writes; format of FileOp::newPredicates()
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* @return boolean
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*/
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final public function dependsOn( array $deps ) {
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foreach ( $this->storagePathsChanged() as $path ) {
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if ( isset( $deps['read'][$path] ) || isset( $deps['write'][$path] ) ) {
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return true; // "output" or "anti" dependency
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}
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}
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foreach ( $this->storagePathsRead() as $path ) {
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if ( isset( $deps['write'][$path] ) ) {
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return true; // "flow" dependency
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}
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}
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return false;
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}
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/**
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* Get the file journal entries for this file operation
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*
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* @param array $oPredicates Pre-op info about files (format of FileOp::newPredicates)
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* @param array $nPredicates Post-op info about files (format of FileOp::newPredicates)
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* @return Array
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*/
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final public function getJournalEntries( array $oPredicates, array $nPredicates ) {
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if ( !$this->doOperation ) {
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return array(); // this is a no-op
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}
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$nullEntries = array();
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$updateEntries = array();
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$deleteEntries = array();
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$pathsUsed = array_merge( $this->storagePathsRead(), $this->storagePathsChanged() );
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foreach ( array_unique( $pathsUsed ) as $path ) {
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$nullEntries[] = array( // assertion for recovery
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'op' => 'null',
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'path' => $path,
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'newSha1' => $this->fileSha1( $path, $oPredicates )
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);
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}
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foreach ( $this->storagePathsChanged() as $path ) {
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if ( $nPredicates['sha1'][$path] === false ) { // deleted
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$deleteEntries[] = array(
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'op' => 'delete',
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'path' => $path,
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'newSha1' => ''
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);
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} else { // created/updated
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$updateEntries[] = array(
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'op' => $this->fileExists( $path, $oPredicates ) ? 'update' : 'create',
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'path' => $path,
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'newSha1' => $nPredicates['sha1'][$path]
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);
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}
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}
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return array_merge( $nullEntries, $updateEntries, $deleteEntries );
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}
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/**
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* Check preconditions of the operation without writing anything.
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* This must update $predicates for each path that the op can change
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* except when a failing status object is returned.
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*
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* @param Array $predicates
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* @return Status
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*/
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final public function precheck( array &$predicates ) {
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if ( $this->state !== self::STATE_NEW ) {
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return Status::newFatal( 'fileop-fail-state', self::STATE_NEW, $this->state );
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}
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$this->state = self::STATE_CHECKED;
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$status = $this->doPrecheck( $predicates );
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if ( !$status->isOK() ) {
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$this->failed = true;
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}
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return $status;
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}
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/**
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* @return Status
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*/
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protected function doPrecheck( array &$predicates ) {
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return Status::newGood();
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}
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/**
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* Attempt the operation
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*
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* @return Status
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*/
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final public function attempt() {
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if ( $this->state !== self::STATE_CHECKED ) {
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return Status::newFatal( 'fileop-fail-state', self::STATE_CHECKED, $this->state );
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} elseif ( $this->failed ) { // failed precheck
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return Status::newFatal( 'fileop-fail-attempt-precheck' );
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}
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$this->state = self::STATE_ATTEMPTED;
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if ( $this->doOperation ) {
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$status = $this->doAttempt();
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if ( !$status->isOK() ) {
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$this->failed = true;
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$this->logFailure( 'attempt' );
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}
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} else { // no-op
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$status = Status::newGood();
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}
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return $status;
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}
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/**
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* @return Status
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*/
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protected function doAttempt() {
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return Status::newGood();
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}
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/**
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* Attempt the operation in the background
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*
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* @return Status
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*/
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final public function attemptAsync() {
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$this->async = true;
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$result = $this->attempt();
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$this->async = false;
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return $result;
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}
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/**
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* Get the file operation parameters
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*
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* @return Array (required params list, optional params list)
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*/
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protected function allowedParams() {
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return array( array(), array() );
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}
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/**
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* Adjust params to FileBackendStore internal file calls
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*
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* @param Array $params
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* @return Array (required params list, optional params list)
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*/
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protected function setFlags( array $params ) {
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return array( 'async' => $this->async ) + $params;
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}
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/**
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* Get a list of storage paths read from for this operation
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*
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* @return Array
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*/
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public function storagePathsRead() {
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return array();
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}
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/**
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* Get a list of storage paths written to for this operation
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*
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* @return Array
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*/
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public function storagePathsChanged() {
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return array();
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}
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/**
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* Check for errors with regards to the destination file already existing.
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* Also set the destExists, overwriteSameCase and sourceSha1 member variables.
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* A bad status will be returned if there is no chance it can be overwritten.
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*
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* @param Array $predicates
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* @return Status
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*/
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protected function precheckDestExistence( array $predicates ) {
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$status = Status::newGood();
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// Get hash of source file/string and the destination file
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$this->sourceSha1 = $this->getSourceSha1Base36(); // FS file or data string
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if ( $this->sourceSha1 === null ) { // file in storage?
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$this->sourceSha1 = $this->fileSha1( $this->params['src'], $predicates );
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}
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$this->overwriteSameCase = false;
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$this->destExists = $this->fileExists( $this->params['dst'], $predicates );
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if ( $this->destExists ) {
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if ( $this->getParam( 'overwrite' ) ) {
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return $status; // OK
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} elseif ( $this->getParam( 'overwriteSame' ) ) {
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$dhash = $this->fileSha1( $this->params['dst'], $predicates );
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// Check if hashes are valid and match each other...
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if ( !strlen( $this->sourceSha1 ) || !strlen( $dhash ) ) {
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$status->fatal( 'backend-fail-hashes' );
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} elseif ( $this->sourceSha1 !== $dhash ) {
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// Give an error if the files are not identical
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$status->fatal( 'backend-fail-notsame', $this->params['dst'] );
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} else {
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$this->overwriteSameCase = true; // OK
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}
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return $status; // do nothing; either OK or bad status
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} else {
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$status->fatal( 'backend-fail-alreadyexists', $this->params['dst'] );
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return $status;
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}
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}
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return $status;
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}
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/**
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* precheckDestExistence() helper function to get the source file SHA-1.
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* Subclasses should overwride this if the source is not in storage.
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*
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* @return string|bool Returns false on failure
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*/
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protected function getSourceSha1Base36() {
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return null; // N/A
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}
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/**
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* Check if a file will exist in storage when this operation is attempted
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*
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* @param string $source Storage path
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* @param Array $predicates
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* @return bool
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*/
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final protected function fileExists( $source, array $predicates ) {
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if ( isset( $predicates['exists'][$source] ) ) {
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return $predicates['exists'][$source]; // previous op assures this
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} else {
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$params = array( 'src' => $source, 'latest' => true );
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return $this->backend->fileExists( $params );
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}
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}
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/**
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* Get the SHA-1 of a file in storage when this operation is attempted
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*
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* @param string $source Storage path
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* @param Array $predicates
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* @return string|bool False on failure
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*/
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final protected function fileSha1( $source, array $predicates ) {
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if ( isset( $predicates['sha1'][$source] ) ) {
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return $predicates['sha1'][$source]; // previous op assures this
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} elseif ( isset( $predicates['exists'][$source] ) && !$predicates['exists'][$source] ) {
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return false; // previous op assures this
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} else {
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$params = array( 'src' => $source, 'latest' => true );
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return $this->backend->getFileSha1Base36( $params );
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}
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}
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/**
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* Get the backend this operation is for
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*
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* @return FileBackendStore
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*/
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public function getBackend() {
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return $this->backend;
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}
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/**
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* Log a file operation failure and preserve any temp files
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*
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* @param string $action
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* @return void
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*/
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final public function logFailure( $action ) {
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$params = $this->params;
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$params['failedAction'] = $action;
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try {
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wfDebugLog( 'FileOperation', get_class( $this ) .
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" failed (batch #{$this->batchId}): " . FormatJson::encode( $params ) );
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} catch ( Exception $e ) {
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// bad config? debug log error?
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}
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}
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}
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/**
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* Create a file in the backend with the given content.
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* Parameters for this operation are outlined in FileBackend::doOperations().
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*/
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class CreateFileOp extends FileOp {
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protected function allowedParams() {
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return array( array( 'content', 'dst' ),
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array( 'overwrite', 'overwriteSame', 'headers' ) );
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}
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protected function doPrecheck( array &$predicates ) {
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$status = Status::newGood();
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// Check if the source data is too big
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if ( strlen( $this->getParam( 'content' ) ) > $this->backend->maxFileSizeInternal() ) {
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$status->fatal( 'backend-fail-maxsize',
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$this->params['dst'], $this->backend->maxFileSizeInternal() );
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$status->fatal( 'backend-fail-create', $this->params['dst'] );
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return $status;
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// Check if a file can be placed/changed at the destination
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} elseif ( !$this->backend->isPathUsableInternal( $this->params['dst'] ) ) {
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$status->fatal( 'backend-fail-usable', $this->params['dst'] );
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$status->fatal( 'backend-fail-create', $this->params['dst'] );
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return $status;
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}
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// Check if destination file exists
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$status->merge( $this->precheckDestExistence( $predicates ) );
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$this->params['dstExists'] = $this->destExists; // see FileBackendStore::setFileCache()
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if ( $status->isOK() ) {
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// Update file existence predicates
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$predicates['exists'][$this->params['dst']] = true;
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$predicates['sha1'][$this->params['dst']] = $this->sourceSha1;
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}
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return $status; // safe to call attempt()
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}
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protected function doAttempt() {
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if ( !$this->overwriteSameCase ) {
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// Create the file at the destination
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return $this->backend->createInternal( $this->setFlags( $this->params ) );
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}
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return Status::newGood();
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}
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protected function getSourceSha1Base36() {
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return wfBaseConvert( sha1( $this->params['content'] ), 16, 36, 31 );
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}
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public function storagePathsChanged() {
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return array( $this->params['dst'] );
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}
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}
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/**
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* Store a file into the backend from a file on the file system.
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* Parameters for this operation are outlined in FileBackend::doOperations().
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*/
|
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class StoreFileOp extends FileOp {
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protected function allowedParams() {
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return array( array( 'src', 'dst' ),
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array( 'overwrite', 'overwriteSame', 'headers' ) );
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}
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protected function doPrecheck( array &$predicates ) {
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$status = Status::newGood();
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// Check if the source file exists on the file system
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if ( !is_file( $this->params['src'] ) ) {
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$status->fatal( 'backend-fail-notexists', $this->params['src'] );
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return $status;
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// Check if the source file is too big
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} elseif ( filesize( $this->params['src'] ) > $this->backend->maxFileSizeInternal() ) {
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$status->fatal( 'backend-fail-maxsize',
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$this->params['dst'], $this->backend->maxFileSizeInternal() );
|
|
$status->fatal( 'backend-fail-store', $this->params['src'], $this->params['dst'] );
|
|
return $status;
|
|
// Check if a file can be placed/changed at the destination
|
|
} elseif ( !$this->backend->isPathUsableInternal( $this->params['dst'] ) ) {
|
|
$status->fatal( 'backend-fail-usable', $this->params['dst'] );
|
|
$status->fatal( 'backend-fail-store', $this->params['src'], $this->params['dst'] );
|
|
return $status;
|
|
}
|
|
// Check if destination file exists
|
|
$status->merge( $this->precheckDestExistence( $predicates ) );
|
|
$this->params['dstExists'] = $this->destExists; // see FileBackendStore::setFileCache()
|
|
if ( $status->isOK() ) {
|
|
// Update file existence predicates
|
|
$predicates['exists'][$this->params['dst']] = true;
|
|
$predicates['sha1'][$this->params['dst']] = $this->sourceSha1;
|
|
}
|
|
return $status; // safe to call attempt()
|
|
}
|
|
|
|
protected function doAttempt() {
|
|
if ( !$this->overwriteSameCase ) {
|
|
// Store the file at the destination
|
|
return $this->backend->storeInternal( $this->setFlags( $this->params ) );
|
|
}
|
|
return Status::newGood();
|
|
}
|
|
|
|
protected function getSourceSha1Base36() {
|
|
wfSuppressWarnings();
|
|
$hash = sha1_file( $this->params['src'] );
|
|
wfRestoreWarnings();
|
|
if ( $hash !== false ) {
|
|
$hash = wfBaseConvert( $hash, 16, 36, 31 );
|
|
}
|
|
return $hash;
|
|
}
|
|
|
|
public function storagePathsChanged() {
|
|
return array( $this->params['dst'] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Copy a file from one storage path to another in the backend.
|
|
* Parameters for this operation are outlined in FileBackend::doOperations().
|
|
*/
|
|
class CopyFileOp extends FileOp {
|
|
protected function allowedParams() {
|
|
return array( array( 'src', 'dst' ),
|
|
array( 'overwrite', 'overwriteSame', 'ignoreMissingSource', 'headers' ) );
|
|
}
|
|
|
|
protected function doPrecheck( array &$predicates ) {
|
|
$status = Status::newGood();
|
|
// Check if the source file exists
|
|
if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
|
|
if ( $this->getParam( 'ignoreMissingSource' ) ) {
|
|
$this->doOperation = false; // no-op
|
|
// Update file existence predicates (cache 404s)
|
|
$predicates['exists'][$this->params['src']] = false;
|
|
$predicates['sha1'][$this->params['src']] = false;
|
|
return $status; // nothing to do
|
|
} else {
|
|
$status->fatal( 'backend-fail-notexists', $this->params['src'] );
|
|
return $status;
|
|
}
|
|
// Check if a file can be placed/changed at the destination
|
|
} elseif ( !$this->backend->isPathUsableInternal( $this->params['dst'] ) ) {
|
|
$status->fatal( 'backend-fail-usable', $this->params['dst'] );
|
|
$status->fatal( 'backend-fail-copy', $this->params['src'], $this->params['dst'] );
|
|
return $status;
|
|
}
|
|
// Check if destination file exists
|
|
$status->merge( $this->precheckDestExistence( $predicates ) );
|
|
$this->params['dstExists'] = $this->destExists; // see FileBackendStore::setFileCache()
|
|
if ( $status->isOK() ) {
|
|
// Update file existence predicates
|
|
$predicates['exists'][$this->params['dst']] = true;
|
|
$predicates['sha1'][$this->params['dst']] = $this->sourceSha1;
|
|
}
|
|
return $status; // safe to call attempt()
|
|
}
|
|
|
|
protected function doAttempt() {
|
|
if ( $this->overwriteSameCase ) {
|
|
$status = Status::newGood(); // nothing to do
|
|
} elseif ( $this->params['src'] === $this->params['dst'] ) {
|
|
// Just update the destination file headers
|
|
$headers = $this->getParam( 'headers' ) ?: array();
|
|
$status = $this->backend->describeInternal( $this->setFlags( array(
|
|
'src' => $this->params['dst'], 'headers' => $headers
|
|
) ) );
|
|
} else {
|
|
// Copy the file to the destination
|
|
$status = $this->backend->copyInternal( $this->setFlags( $this->params ) );
|
|
}
|
|
return $status;
|
|
}
|
|
|
|
public function storagePathsRead() {
|
|
return array( $this->params['src'] );
|
|
}
|
|
|
|
public function storagePathsChanged() {
|
|
return array( $this->params['dst'] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Move a file from one storage path to another in the backend.
|
|
* Parameters for this operation are outlined in FileBackend::doOperations().
|
|
*/
|
|
class MoveFileOp extends FileOp {
|
|
protected function allowedParams() {
|
|
return array( array( 'src', 'dst' ),
|
|
array( 'overwrite', 'overwriteSame', 'ignoreMissingSource', 'headers' ) );
|
|
}
|
|
|
|
protected function doPrecheck( array &$predicates ) {
|
|
$status = Status::newGood();
|
|
// Check if the source file exists
|
|
if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
|
|
if ( $this->getParam( 'ignoreMissingSource' ) ) {
|
|
$this->doOperation = false; // no-op
|
|
// Update file existence predicates (cache 404s)
|
|
$predicates['exists'][$this->params['src']] = false;
|
|
$predicates['sha1'][$this->params['src']] = false;
|
|
return $status; // nothing to do
|
|
} else {
|
|
$status->fatal( 'backend-fail-notexists', $this->params['src'] );
|
|
return $status;
|
|
}
|
|
// Check if a file can be placed/changed at the destination
|
|
} elseif ( !$this->backend->isPathUsableInternal( $this->params['dst'] ) ) {
|
|
$status->fatal( 'backend-fail-usable', $this->params['dst'] );
|
|
$status->fatal( 'backend-fail-move', $this->params['src'], $this->params['dst'] );
|
|
return $status;
|
|
}
|
|
// Check if destination file exists
|
|
$status->merge( $this->precheckDestExistence( $predicates ) );
|
|
$this->params['dstExists'] = $this->destExists; // see FileBackendStore::setFileCache()
|
|
if ( $status->isOK() ) {
|
|
// Update file existence predicates
|
|
$predicates['exists'][$this->params['src']] = false;
|
|
$predicates['sha1'][$this->params['src']] = false;
|
|
$predicates['exists'][$this->params['dst']] = true;
|
|
$predicates['sha1'][$this->params['dst']] = $this->sourceSha1;
|
|
}
|
|
return $status; // safe to call attempt()
|
|
}
|
|
|
|
protected function doAttempt() {
|
|
if ( $this->overwriteSameCase ) {
|
|
if ( $this->params['src'] === $this->params['dst'] ) {
|
|
// Do nothing to the destination (which is also the source)
|
|
$status = Status::newGood();
|
|
} else {
|
|
// Just delete the source as the destination file needs no changes
|
|
$status = $this->backend->deleteInternal( $this->setFlags(
|
|
array( 'src' => $this->params['src'] )
|
|
) );
|
|
}
|
|
} elseif ( $this->params['src'] === $this->params['dst'] ) {
|
|
// Just update the destination file headers
|
|
$headers = $this->getParam( 'headers' ) ?: array();
|
|
$status = $this->backend->describeInternal( $this->setFlags(
|
|
array( 'src' => $this->params['dst'], 'headers' => $headers )
|
|
) );
|
|
} else {
|
|
// Move the file to the destination
|
|
$status = $this->backend->moveInternal( $this->setFlags( $this->params ) );
|
|
}
|
|
return $status;
|
|
}
|
|
|
|
public function storagePathsRead() {
|
|
return array( $this->params['src'] );
|
|
}
|
|
|
|
public function storagePathsChanged() {
|
|
return array( $this->params['src'], $this->params['dst'] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Delete a file at the given storage path from the backend.
|
|
* Parameters for this operation are outlined in FileBackend::doOperations().
|
|
*/
|
|
class DeleteFileOp extends FileOp {
|
|
protected function allowedParams() {
|
|
return array( array( 'src' ), array( 'ignoreMissingSource' ) );
|
|
}
|
|
|
|
protected function doPrecheck( array &$predicates ) {
|
|
$status = Status::newGood();
|
|
// Check if the source file exists
|
|
if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
|
|
if ( $this->getParam( 'ignoreMissingSource' ) ) {
|
|
$this->doOperation = false; // no-op
|
|
// Update file existence predicates (cache 404s)
|
|
$predicates['exists'][$this->params['src']] = false;
|
|
$predicates['sha1'][$this->params['src']] = false;
|
|
return $status; // nothing to do
|
|
} else {
|
|
$status->fatal( 'backend-fail-notexists', $this->params['src'] );
|
|
return $status;
|
|
}
|
|
// Check if a file can be placed/changed at the source
|
|
} elseif ( !$this->backend->isPathUsableInternal( $this->params['src'] ) ) {
|
|
$status->fatal( 'backend-fail-usable', $this->params['src'] );
|
|
$status->fatal( 'backend-fail-delete', $this->params['src'] );
|
|
return $status;
|
|
}
|
|
// Update file existence predicates
|
|
$predicates['exists'][$this->params['src']] = false;
|
|
$predicates['sha1'][$this->params['src']] = false;
|
|
return $status; // safe to call attempt()
|
|
}
|
|
|
|
protected function doAttempt() {
|
|
// Delete the source file
|
|
return $this->backend->deleteInternal( $this->setFlags( $this->params ) );
|
|
}
|
|
|
|
public function storagePathsChanged() {
|
|
return array( $this->params['src'] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Change metadata for a file at the given storage path in the backend.
|
|
* Parameters for this operation are outlined in FileBackend::doOperations().
|
|
*/
|
|
class DescribeFileOp extends FileOp {
|
|
protected function allowedParams() {
|
|
return array( array( 'src' ), array( 'headers' ) );
|
|
}
|
|
|
|
protected function doPrecheck( array &$predicates ) {
|
|
$status = Status::newGood();
|
|
// Check if the source file exists
|
|
if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
|
|
$status->fatal( 'backend-fail-notexists', $this->params['src'] );
|
|
return $status;
|
|
// Check if a file can be placed/changed at the source
|
|
} elseif ( !$this->backend->isPathUsableInternal( $this->params['src'] ) ) {
|
|
$status->fatal( 'backend-fail-usable', $this->params['src'] );
|
|
$status->fatal( 'backend-fail-describe', $this->params['src'] );
|
|
return $status;
|
|
}
|
|
// Update file existence predicates
|
|
$predicates['exists'][$this->params['src']] =
|
|
$this->fileExists( $this->params['src'], $predicates );
|
|
$predicates['sha1'][$this->params['src']] =
|
|
$this->fileSha1( $this->params['src'], $predicates );
|
|
return $status; // safe to call attempt()
|
|
}
|
|
|
|
protected function doAttempt() {
|
|
// Update the source file's metadata
|
|
return $this->backend->describeInternal( $this->setFlags( $this->params ) );
|
|
}
|
|
|
|
public function storagePathsChanged() {
|
|
return array( $this->params['src'] );
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Placeholder operation that has no params and does nothing
|
|
*/
|
|
class NullFileOp extends FileOp {}
|