maintenance/copyFileBackend.php

   1 <?php
   2 /**
   3  * Copy all files in some containers of one backend to another.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance
  22  */
  23
  24 require_once __DIR__ . '/Maintenance.php';
  25
  26 /**
  27  * Copy all files in one container of one backend to another.
  28  *
  29  * This can also be used to re-shard the files for one backend using the
  30  * config of second backend. The second backend should have the same config
  31  * as the first, except for it having a different name and different sharding
  32  * configuration. The backend should be made read-only while this runs.
  33  * After this script finishes, the old files in the containers can be deleted.
  34  *
  35  * @ingroup Maintenance
  36  */
  37 class CopyFileBackend extends Maintenance {
  38         /** @var array|null (path sha1 => stat) Pre-computed dst stat entries from listings */
  39         protected $statCache = null;
  40
  41         public function __construct() {
  42                 parent::__construct();
  43                 $this->mDescription = "Copy files in one backend to another.";
  44                 $this->addOption( 'src', 'Backend containing the source files', true, true );
  45                 $this->addOption( 'dst', 'Backend where files should be copied to', true, true );
  46                 $this->addOption( 'containers', 'Pipe separated list of containers', true, true );
  47                 $this->addOption( 'subdir', 'Only do items in this child directory', false, true );
  48                 $this->addOption( 'ratefile', 'File to check periodically for batch size', false, true );
  49                 $this->addOption( 'prestat', 'Stat the destination files first (try to use listings)' );
  50                 $this->addOption( 'skiphash', 'Skip SHA-1 sync checks for files' );
  51                 $this->addOption( 'missingonly', 'Only copy files missing from destination listing' );
  52                 $this->addOption( 'syncviadelete', 'Delete destination files missing from source listing' );
  53                 $this->addOption( 'utf8only', 'Skip source files that do not have valid UTF-8 names' );
  54                 $this->setBatchSize( 50 );
  55         }
  56
  57         public function execute() {
  58                 $src = FileBackendGroup::singleton()->get( $this->getOption( 'src' ) );
  59                 $dst = FileBackendGroup::singleton()->get( $this->getOption( 'dst' ) );
  60                 $containers = explode( '|', $this->getOption( 'containers' ) );
  61                 $subDir = rtrim( $this->getOption( 'subdir', '' ), '/' );
  62
  63                 $rateFile = $this->getOption( 'ratefile' );
  64
  65                 if ( $this->hasOption( 'utf8only' ) && !extension_loaded( 'mbstring' ) ) {
  66                         $this->error( "Cannot check for UTF-8, mbstring extension missing.", 1 ); // die
  67                 }
  68
  69                 foreach ( $containers as $container ) {
  70                         if ( $subDir != '' ) {
  71                                 $backendRel = "$container/$subDir";
  72                                 $this->output( "Doing container '$container', directory '$subDir'...\n" );
  73                         } else {
  74                                 $backendRel = $container;
  75                                 $this->output( "Doing container '$container'...\n" );
  76                         }
  77
  78                         if ( $this->hasOption( 'missingonly' ) ) {
  79                                 $this->output( "\tBuilding list of missing files..." );
  80                                 $srcPathsRel = $this->getListingDiffRel( $src, $dst, $backendRel );
  81                                 $this->output( count( $srcPathsRel ) . " file(s) need to be copied.\n" );
  82                         } else {
  83                                 $srcPathsRel = $src->getFileList( array(
  84                                         'dir' => $src->getRootStoragePath() . "/$backendRel",
  85                                         'adviseStat' => true // avoid HEADs
  86                                 ) );
  87                                 if ( $srcPathsRel === null ) {
  88                                         $this->error( "Could not list files in $container.", 1 ); // die
  89                                 }
  90                         }
  91
  92                         if ( $this->getOption( 'prestat' ) && !$this->hasOption( 'missingonly' ) ) {
  93                                 // Build the stat cache for the destination files
  94                                 $this->output( "\tBuilding destination stat cache..." );
  95                                 $dstPathsRel = $dst->getFileList( array(
  96                                         'dir' => $dst->getRootStoragePath() . "/$backendRel",
  97                                         'adviseStat' => true // avoid HEADs
  98                                 ) );
  99                                 if ( $dstPathsRel === null ) {
 100                                         $this->error( "Could not list files in $container.", 1 ); // die
 101                                 }
 102                                 $this->statCache = array();
 103                                 foreach ( $dstPathsRel as $dstPathRel ) {
 104                                         $path = $dst->getRootStoragePath() . "/$backendRel/$dstPathRel";
 105                                         $this->statCache[sha1( $path )] = $dst->getFileStat( array( 'src' => $path ) );
 106                                 }
 107                                 $this->output( "done [" . count( $this->statCache ) . " file(s)]\n" );
 108                         }
 109
 110                         $this->output( "\tCopying file(s)...\n" );
 111                         $count = 0;
 112                         $batchPaths = array();
 113                         foreach ( $srcPathsRel as $srcPathRel ) {
 114                                 // Check up on the rate file periodically to adjust the concurrency
 115                                 if ( $rateFile && ( !$count || ( $count % 500 ) == 0 ) ) {
 116                                         $this->mBatchSize = max( 1, (int)file_get_contents( $rateFile ) );
 117                                         $this->output( "\tBatch size is now {$this->mBatchSize}.\n" );
 118                                 }
 119                                 $batchPaths[$srcPathRel] = 1; // remove duplicates
 120                                 if ( count( $batchPaths ) >= $this->mBatchSize ) {
 121                                         $this->copyFileBatch( array_keys( $batchPaths ), $backendRel, $src, $dst );
 122                                         $batchPaths = array(); // done
 123                                 }
 124                                 ++$count;
 125                         }
 126                         if ( count( $batchPaths ) ) { // left-overs
 127                                 $this->copyFileBatch( array_keys( $batchPaths ), $backendRel, $src, $dst );
 128                                 $batchPaths = array(); // done
 129                         }
 130                         $this->output( "\tCopied $count file(s).\n" );
 131
 132                         if ( $this->hasOption( 'syncviadelete' ) ) {
 133                                 $this->output( "\tBuilding list of excess destination files..." );
 134                                 $delPathsRel = $this->getListingDiffRel( $dst, $src, $backendRel );
 135                                 $this->output( count( $delPathsRel ) . " file(s) need to be deleted.\n" );
 136
 137                                 $this->output( "\tDeleting file(s)...\n" );
 138                                 $count = 0;
 139                                 $batchPaths = array();
 140                                 foreach ( $delPathsRel as $delPathRel ) {
 141                                         // Check up on the rate file periodically to adjust the concurrency
 142                                         if ( $rateFile && ( !$count || ( $count % 500 ) == 0 ) ) {
 143                                                 $this->mBatchSize = max( 1, (int)file_get_contents( $rateFile ) );
 144                                                 $this->output( "\tBatch size is now {$this->mBatchSize}.\n" );
 145                                         }
 146                                         $batchPaths[$delPathRel] = 1; // remove duplicates
 147                                         if ( count( $batchPaths ) >= $this->mBatchSize ) {
 148                                                 $this->delFileBatch( array_keys( $batchPaths ), $backendRel, $dst );
 149                                                 $batchPaths = array(); // done
 150                                         }
 151                                         ++$count;
 152                                 }
 153                                 if ( count( $batchPaths ) ) { // left-overs
 154                                         $this->delFileBatch( array_keys( $batchPaths ), $backendRel, $dst );
 155                                         $batchPaths = array(); // done
 156                                 }
 157
 158                                 $this->output( "\tDeleted $count file(s).\n" );
 159                         }
 160
 161                         if ( $subDir != '' ) {
 162                                 $this->output( "Finished container '$container', directory '$subDir'.\n" );
 163                         } else {
 164                                 $this->output( "Finished container '$container'.\n" );
 165                         }
 166                 }
 167
 168                 $this->output( "Done.\n" );
 169         }
 170
 171         /**
 172          * @param FileBackend $src
 173          * @param FileBackend $dst
 174          * @param string $backendRel
 175          * @return array (rel paths in $src minus those in $dst)
 176          */
 177         protected function getListingDiffRel( FileBackend $src, FileBackend $dst, $backendRel ) {
 178                 $srcPathsRel = $src->getFileList( array(
 179                         'dir' => $src->getRootStoragePath() . "/$backendRel" ) );
 180                 if ( $srcPathsRel === null ) {
 181                         $this->error( "Could not list files in source container.", 1 ); // die
 182                 }
 183                 $dstPathsRel = $dst->getFileList( array(
 184                         'dir' => $dst->getRootStoragePath() . "/$backendRel" ) );
 185                 if ( $dstPathsRel === null ) {
 186                         $this->error( "Could not list files in destination container.", 1 ); // die
 187                 }
 188                 // Get the list of destination files
 189                 $relFilesDstSha1 = array();
 190                 foreach ( $dstPathsRel as $dstPathRel ) {
 191                         $relFilesDstSha1[sha1( $dstPathRel )] = 1;
 192                 }
 193                 unset( $dstPathsRel ); // free
 194                 // Get the list of missing files
 195                 $missingPathsRel = array();
 196                 foreach ( $srcPathsRel as $srcPathRel ) {
 197                         if ( !isset( $relFilesDstSha1[sha1( $srcPathRel )] ) ) {
 198                                 $missingPathsRel[] = $srcPathRel;
 199                         }
 200                 }
 201                 unset( $srcPathsRel ); // free
 202
 203                 return $missingPathsRel;
 204         }
 205
 206         /**
 207          * @param array $srcPathsRel
 208          * @param string $backendRel
 209          * @param FileBackend $src
 210          * @param FileBackend $dst
 211          * @return void
 212          */
 213         protected function copyFileBatch(
 214                 array $srcPathsRel, $backendRel, FileBackend $src, FileBackend $dst
 215         ) {
 216                 $ops = array();
 217                 $fsFiles = array();
 218                 $copiedRel = array(); // for output message
 219                 $wikiId = $src->getWikiId();
 220
 221                 // Download the batch of source files into backend cache...
 222                 if ( $this->hasOption( 'missingonly' ) ) {
 223                         $srcPaths = array();
 224                         foreach ( $srcPathsRel as $srcPathRel ) {
 225                                 $srcPaths[] = $src->getRootStoragePath() . "/$backendRel/$srcPathRel";
 226                         }
 227                         $t_start = microtime( true );
 228                         $fsFiles = $src->getLocalReferenceMulti( array( 'srcs' => $srcPaths, 'latest' => 1 ) );
 229                         $elapsed_ms = floor( ( microtime( true ) - $t_start ) * 1000 );
 230                         $this->output( "\n\tDownloaded these file(s) [{$elapsed_ms}ms]:\n\t" .
 231                                 implode( "\n\t", $srcPaths ) . "\n\n" );
 232                 }
 233
 234                 // Determine what files need to be copied over...
 235                 foreach ( $srcPathsRel as $srcPathRel ) {
 236                         $srcPath = $src->getRootStoragePath() . "/$backendRel/$srcPathRel";
 237                         $dstPath = $dst->getRootStoragePath() . "/$backendRel/$srcPathRel";
 238                         if ( $this->hasOption( 'utf8only' ) && !mb_check_encoding( $srcPath, 'UTF-8' ) ) {
 239                                 $this->error( "$wikiId: Detected illegal (non-UTF8) path for $srcPath." );
 240                                 continue;
 241                         } elseif ( !$this->hasOption( 'missingonly' )
 242                                 && $this->filesAreSame( $src, $dst, $srcPath, $dstPath )
 243                         ) {
 244                                 $this->output( "\tAlready have $srcPathRel.\n" );
 245                                 continue; // assume already copied...
 246                         }
 247                         $fsFile = array_key_exists( $srcPath, $fsFiles )
 248                                 ? $fsFiles[$srcPath]
 249                                 : $src->getLocalReference( array( 'src' => $srcPath, 'latest' => 1 ) );
 250                         if ( !$fsFile ) {
 251                                 $src->clearCache( array( $srcPath ) );
 252                                 if ( $src->fileExists( array( 'src' => $srcPath, 'latest' => 1 ) ) === false ) {
 253                                         $this->error( "$wikiId: File '$srcPath' was listed but does not exist." );
 254                                 } else {
 255                                         $this->error( "$wikiId: Could not get local copy of $srcPath." );
 256                                 }
 257                                 continue;
 258                         } elseif ( !$fsFile->exists() ) {
 259                                 // FSFileBackends just return the path for getLocalReference() and paths with
 260                                 // illegal slashes may get normalized to a different path. This can cause the
 261                                 // local reference to not exist...skip these broken files.
 262                                 $this->error( "$wikiId: Detected possible illegal path for $srcPath." );
 263                                 continue;
 264                         }
 265                         $fsFiles[] = $fsFile; // keep TempFSFile objects alive as needed
 266                         // Note: prepare() is usually fast for key/value backends
 267                         $status = $dst->prepare( array( 'dir' => dirname( $dstPath ), 'bypassReadOnly' => 1 ) );
 268                         if ( !$status->isOK() ) {
 269                                 $this->error( print_r( $status->getErrorsArray(), true ) );
 270                                 $this->error( "$wikiId: Could not copy $srcPath to $dstPath.", 1 ); // die
 271                         }
 272                         $ops[] = array( 'op' => 'store',
 273                                 'src' => $fsFile->getPath(), 'dst' => $dstPath, 'overwrite' => 1 );
 274                         $copiedRel[] = $srcPathRel;
 275                 }
 276
 277                 // Copy in the batch of source files...
 278                 $t_start = microtime( true );
 279                 $status = $dst->doQuickOperations( $ops, array( 'bypassReadOnly' => 1 ) );
 280                 if ( !$status->isOK() ) {
 281                         sleep( 10 ); // wait and retry copy again
 282                         $status = $dst->doQuickOperations( $ops, array( 'bypassReadOnly' => 1 ) );
 283                 }
 284                 $elapsed_ms = floor( ( microtime( true ) - $t_start ) * 1000 );
 285                 if ( !$status->isOK() ) {
 286                         $this->error( print_r( $status->getErrorsArray(), true ) );
 287                         $this->error( "$wikiId: Could not copy file batch.", 1 ); // die
 288                 } elseif ( count( $copiedRel ) ) {
 289                         $this->output( "\n\tCopied these file(s) [{$elapsed_ms}ms]:\n\t" .
 290                                 implode( "\n\t", $copiedRel ) . "\n\n" );
 291                 }
 292         }
 293
 294         /**
 295          * @param array $dstPathsRel
 296          * @param string $backendRel
 297          * @param FileBackend $dst
 298          * @return void
 299          */
 300         protected function delFileBatch(
 301                 array $dstPathsRel, $backendRel, FileBackend $dst
 302         ) {
 303                 $ops = array();
 304                 $deletedRel = array(); // for output message
 305                 $wikiId = $dst->getWikiId();
 306
 307                 // Determine what files need to be copied over...
 308                 foreach ( $dstPathsRel as $dstPathRel ) {
 309                         $dstPath = $dst->getRootStoragePath() . "/$backendRel/$dstPathRel";
 310                         $ops[] = array( 'op' => 'delete', 'src' => $dstPath );
 311                         $deletedRel[] = $dstPathRel;
 312                 }
 313
 314                 // Delete the batch of source files...
 315                 $t_start = microtime( true );
 316                 $status = $dst->doQuickOperations( $ops, array( 'bypassReadOnly' => 1 ) );
 317                 if ( !$status->isOK() ) {
 318                         sleep( 10 ); // wait and retry copy again
 319                         $status = $dst->doQuickOperations( $ops, array( 'bypassReadOnly' => 1 ) );
 320                 }
 321                 $elapsed_ms = floor( ( microtime( true ) - $t_start ) * 1000 );
 322                 if ( !$status->isOK() ) {
 323                         $this->error( print_r( $status->getErrorsArray(), true ) );
 324                         $this->error( "$wikiId: Could not delete file batch.", 1 ); // die
 325                 } elseif ( count( $deletedRel ) ) {
 326                         $this->output( "\n\tDeleted these file(s) [{$elapsed_ms}ms]:\n\t" .
 327                                 implode( "\n\t", $deletedRel ) . "\n\n" );
 328                 }
 329         }
 330
 331         /**
 332          * @param FileBackend $src
 333          * @param FileBackend $dst
 334          * @param string $sPath
 335          * @param string $dPath
 336          * @return bool
 337          */
 338         protected function filesAreSame( FileBackend $src, FileBackend $dst, $sPath, $dPath ) {
 339                 $skipHash = $this->hasOption( 'skiphash' );
 340                 $srcStat = $src->getFileStat( array( 'src' => $sPath ) );
 341                 $dPathSha1 = sha1( $dPath );
 342                 if ( $this->statCache !== null ) {
 343                         // All dst files are already in stat cache
 344                         $dstStat = isset( $this->statCache[$dPathSha1] )
 345                                 ? $this->statCache[$dPathSha1]
 346                                 : false;
 347                 } else {
 348                         $dstStat = $dst->getFileStat( array( 'src' => $dPath ) );
 349                 }
 350                 // Initial fast checks to see if files are obviously different
 351                 $sameFast = (
 352                         is_array( $srcStat ) // sanity check that source exists
 353                         && is_array( $dstStat ) // dest exists
 354                         && $srcStat['size'] === $dstStat['size']
 355                 );
 356                 // More thorough checks against files
 357                 if ( !$sameFast ) {
 358                         $same = false; // no need to look farther
 359                 } elseif ( isset( $srcStat['md5'] ) && isset( $dstStat['md5'] ) ) {
 360                         // If MD5 was already in the stat info, just use it.
 361                         // This is useful as many objects stores can return this in object listing,
 362                         // so we can use it to avoid slow per-file HEADs.
 363                         $same = ( $srcStat['md5'] === $dstStat['md5'] );
 364                 } elseif ( $skipHash ) {
 365                         // This mode is good for copying to a backup location or resyncing clone
 366                         // backends in FileBackendMultiWrite (since they get writes second, they have
 367                         // higher timestamps). However, when copying the other way, this hits loads of
 368                         // false positives (possibly 100%) and wastes a bunch of time on GETs/PUTs.
 369                         $same = ( $srcStat['mtime'] <= $dstStat['mtime'] );
 370                 } else {
 371                         // This is the slowest method which does many per-file HEADs (unless an object
 372                         // store tracks SHA-1 in listings).
 373                         $same = ( $src->getFileSha1Base36( array( 'src' => $sPath, 'latest' => 1 ) )
 374                                 === $dst->getFileSha1Base36( array( 'src' => $dPath, 'latest' => 1 ) ) );
 375                 }
 376
 377                 return $same;
 378         }
 379 }
 380
 381 $maintClass = 'CopyFileBackend';
 382 require_once RUN_MAINTENANCE_IF_MAIN;