From b430d1b6ee7ae245a1c1ad4116f5de7f52062104 Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Wed, 12 May 2021 21:45:39 -0700
Subject: [PATCH] filer.copy: "check.size" before copying files

fix https://github.com/chrislusf/seaweedfs/issues/2067
---
 weed/command/filer_copy.go | 62 +++++++++++++++++++++++++++++++++++---
 1 file changed, 57 insertions(+), 5 deletions(-)

diff --git a/weed/command/filer_copy.go b/weed/command/filer_copy.go
index dc729ed33..a5d29c451 100644
--- a/weed/command/filer_copy.go
+++ b/weed/command/filer_copy.go
@@ -3,6 +3,7 @@ package command
 import (
 	"context"
 	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/filer"
 	"io"
 	"io/ioutil"
 	"net/http"
@@ -46,6 +47,8 @@ type CopyOptions struct {
 	masters           []string
 	cipher            bool
 	ttlSec            int32
+	checkSize         *bool
+	verbose           *bool
 }
 
 func init() {
@@ -59,6 +62,8 @@ func init() {
 	copy.maxMB = cmdCopy.Flag.Int("maxMB", 4, "split files larger than the limit")
 	copy.concurrenctFiles = cmdCopy.Flag.Int("c", 8, "concurrent file copy goroutines")
 	copy.concurrenctChunks = cmdCopy.Flag.Int("concurrentChunks", 8, "concurrent chunk copy goroutines for each file")
+	copy.checkSize = cmdCopy.Flag.Bool("check.size", false, "copy when the target file size is different from the source file")
+	copy.verbose = cmdCopy.Flag.Bool("verbose", false, "print out details during copying")
 }
 
 var cmdCopy = &Command{
@@ -220,9 +225,9 @@ func genFileCopyTask(fileOrDir string, destPath string, fileCopyTaskChan chan Fi
 
 	if mode.IsDir() {
 		files, _ := ioutil.ReadDir(fileOrDir)
-		println("checking directory", fileOrDir)
 		for _, subFileOrDir := range files {
-			if err = genFileCopyTask(fileOrDir+"/"+subFileOrDir.Name(), destPath+fi.Name()+"/", fileCopyTaskChan); err != nil {
+			cleanedDestDirectory := filepath.Clean(destPath + fi.Name())
+			if err = genFileCopyTask(fileOrDir+"/"+subFileOrDir.Name(), cleanedDestDirectory+"/", fileCopyTaskChan); err != nil {
 				return err
 			}
 		}
@@ -275,6 +280,15 @@ func (worker *FileCopyWorker) doEachCopy(task FileCopyTask) error {
 		}
 	}
 
+	if shouldCopy, err := worker.checkExistingFileFirst(task, f); err != nil {
+		return fmt.Errorf("check existing file: %v", err)
+	} else if !shouldCopy {
+		if *worker.options.verbose {
+			fmt.Printf("skipping copied file: %v\n", f.Name())
+		}
+		return nil
+	}
+
 	// find the chunk count
 	chunkSize := int64(*worker.options.maxMB * 1024 * 1024)
 	chunkCount := 1
@@ -289,6 +303,42 @@ func (worker *FileCopyWorker) doEachCopy(task FileCopyTask) error {
 	return worker.uploadFileInChunks(task, f, chunkCount, chunkSize)
 }
 
+func (worker *FileCopyWorker) checkExistingFileFirst(task FileCopyTask, f *os.File) (shouldCopy bool, err error) {
+
+	shouldCopy = true
+
+	if !*worker.options.checkSize {
+		return
+	}
+
+	fileStat, err := f.Stat()
+	if err != nil {
+		shouldCopy = false
+		return
+	}
+
+	err = pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
+
+		request := &filer_pb.LookupDirectoryEntryRequest{
+			Directory: task.destinationUrlPath,
+			Name:      filepath.Base(f.Name()),
+		}
+
+		resp, lookupErr := client.LookupDirectoryEntry(context.Background(), request)
+		if lookupErr != nil {
+			// mostly not found error
+			return nil
+		}
+
+		if fileStat.Size() == int64(filer.FileSize(resp.Entry)) {
+			shouldCopy = false
+		}
+
+		return nil
+	})
+	return
+}
+
 func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) error {
 
 	// upload the file content
@@ -343,11 +393,13 @@ func (worker *FileCopyWorker) uploadFileAsOne(task FileCopyTask, f *os.File) err
 		if uploadResult.Error != "" {
 			return fmt.Errorf("upload %v to %s result: %v\n", fileName, targetUrl, uploadResult.Error)
 		}
-		fmt.Printf("uploaded %s to %s\n", fileName, targetUrl)
+		if *worker.options.verbose {
+			fmt.Printf("uploaded %s to %s\n", fileName, targetUrl)
+		}
 
 		chunks = append(chunks, uploadResult.ToPbFileChunk(assignResult.FileId, 0))
 
-		fmt.Printf("copied %s => http://%s%s%s\n", fileName, worker.filerHost, task.destinationUrlPath, fileName)
+		fmt.Printf("copied %s => http://%s%s%s\n", f.Name(), worker.filerHost, task.destinationUrlPath, fileName)
 	}
 
 	if err := pb.WithGrpcFilerClient(worker.filerGrpcAddress, worker.options.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
@@ -501,7 +553,7 @@ func (worker *FileCopyWorker) uploadFileInChunks(task FileCopyTask, f *os.File,
 		return fmt.Errorf("upload data %v to http://%s%s%s: %v\n", fileName, worker.filerHost, task.destinationUrlPath, fileName, err)
 	}
 
-	fmt.Printf("copied %s => http://%s%s%s\n", fileName, worker.filerHost, task.destinationUrlPath, fileName)
+	fmt.Printf("copied %s => http://%s%s%s\n", f.Name(), worker.filerHost, task.destinationUrlPath, fileName)
 
 	return nil
 }