From 4845f5c01bade476a054bb717922e9af34e5a8e1 Mon Sep 17 00:00:00 2001
From: Aaron <aschulz@wikimedia.org>
Date: Wed, 25 Apr 2012 15:52:27 -0700
Subject: [PATCH] [FileBackend] Added a script to copy files from one backend
 to another. Useful for re-sharding.

Change-Id: Id942e83420fc5214ddcc8a5b483fd72166a76ff2
---
 maintenance/copyFileBackend.php | 93 +++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 maintenance/copyFileBackend.php

diff --git a/maintenance/copyFileBackend.php b/maintenance/copyFileBackend.php
new file mode 100644
index 0000000000..314318faa2
--- /dev/null
+++ b/maintenance/copyFileBackend.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * Copy all files in one container of one backend to another.
+ *
+ * This can also be used to re-shard the files for one backend using the
+ * config of second backend. The second backend should have the same config
+ * as the first, except for it having a different name and different sharding
+ * configuration. The backend should be made read-only while this runs.
+ * After this script finishes, the old files in the containers can be deleted.
+ *
+ * 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
+ *
+ * @ingroup Maintenance
+ */
+
+require_once( dirname( __FILE__ ) . '/Maintenance.php' );
+
+class CopyFileBackend extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->mDescription = "Copy all the files in one backend to another.";
+		$this->addOption( 'src', 'Backend containing the source files', true, true );
+		$this->addOption( 'dst', 'Backend where files should be copied to', true, true );
+		$this->addOption( 'containers', 'Pipe separated list of containers', true, true );
+		$this->addOption( 'fast', 'Skip SHA-1 checks on pre-existing files' );
+	}
+
+	public function execute() {
+		$src = FileBackendGroup::singleton()->get( $this->getOption( 'src' ) );
+		$dst = FileBackendGroup::singleton()->get( $this->getOption( 'dst' ) );
+
+		$containers = explode( '|', $this->getOption( 'containers' ) );
+		foreach ( $containers as $container ) {
+			$this->output( "Doing container $container...\n" );
+
+			$srcPathsRel = $src->getFileList(
+				array( 'dir' => $src->getRootStoragePath() . "/$container" ) );
+			if ( $srcPathsRel === null ) {
+				$this->error( "Could not list files in $container.", 1 ); // die
+			}
+			foreach ( $srcPathsRel as $srcPathRel ) {
+				$srcPath = $src->getRootStoragePath() . "/$container/$srcPathRel";
+				$dstPath = $dst->getRootStoragePath() . "/$container/$srcPathRel";
+
+				if ( $dst->fileExists( array( 'src' => $dstPath, 'latest' => 1 ) ) ) {
+					if ( $this->hasOption( 'fast' ) ) {
+						$this->output( "Already have $dstPath.\n" );
+						continue; // assume already copied...
+					}
+					$srcSha1 = $src->getFileSha1Base36( array( 'src' => $srcPath ) );
+					$dstSha1 = $dst->getFileSha1Base36( array( 'src' => $dstPath ) );
+					if ( $srcSha1 && $srcSha1 === $dstSha1 ) {
+						$this->output( "Already have $dstPath.\n" );
+						continue; // already copied...
+					}
+				}
+
+				$fsFile = $src->getLocalReference( array( 'src' => $srcPath, 'latest' => 1 ) );
+				if ( !$fsFile ) {
+					$this->error( "Could not get local copy of $srcPath.", 1 ); // die
+				}
+
+				$status = $dst->prepare( array( 'dir' => dirname( $dstPath ) ) );
+				$status->merge( $dst->store(
+					array( 'src' => $fsFile->getPath(), 'dst' => $dstPath ),
+					array( 'nonLocking' => 1, 'nonJournaled' => 1 )
+				) );
+				if ( !$status->isOK() ) {
+					print_r( $status->getErrorsArray() );
+					$this->error( "Could not copy $srcPath to $dstPath.", 1 ); // die
+				}
+
+				$this->output( "Copied $srcPath to $dstPath.\n" );
+			}
+		}
+	}
+}
+
+$maintClass = 'CopyFileBackend';
+require_once( RUN_MAINTENANCE_IF_MAIN );
-- 
2.20.1