Initial implementation of file/inode flags (Linux, BSD, darwin)

Basic support for BSD and Darwin style chflags (stat flags). Applies
these flags at the end of file restore.
Supports linux style ioctl_iflags(2) in a 2 step process. Flags that
need to be applied prior to writes such as compress and especially no-COW
are applied immediately upon file open.

The flags format is backwards compatible. An attribute starting with a
null byte is used to store flags in the entry attributes table. With
an old version of duplicacy the restore of this attribute should silently
fail (effectively be ignored).

Fixes xattr restore to use O_NOFOLLOW so attributes are applied to symlink.

TODO: Tests, possible option to switch off mutable/append prior to
restore of existing file similar to rsync. Does not apply attributes
or flags to the top most directory.

src/duplicacy_backupmanager.go

@@ -21,7 +21,7 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/vmihailenco/msgpack"
+    "github.com/vmihailenco/msgpack"
 )
 
 // BackupManager performs the two major operations, backup and restore, and passes other operations, mostly related to
@@ -36,9 +36,9 @@ type BackupManager struct {
 
 	config *Config // contains a number of options
 
-	nobackupFile       string // don't backup directory when this file name is found
-	filtersFile        string // the path to the filters file
-	excludeByAttribute bool   // don't backup file based on file attribute
+	nobackupFile string // don't backup directory when this file name is found
+	filtersFile string  // the path to the filters file
+	excludeByAttribute bool // don't backup file based on file attribute
 
 	cachePath string
 }
@@ -146,7 +146,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 
 	if manager.config.DataShards != 0 && manager.config.ParityShards != 0 {
 		LOG_INFO("BACKUP_ERASURECODING", "Erasure coding is enabled with %d data shards and %d parity shards",
-			manager.config.DataShards, manager.config.ParityShards)
+		         manager.config.DataShards, manager.config.ParityShards)
 	}
 
 	if manager.config.rsaPublicKey != nil && len(manager.config.FileKey) > 0 {
@@ -187,7 +187,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 
 	// If the listing operation is fast and this is an initial backup, list all chunks and
 	// put them in the cache.
-	if manager.storage.IsFastListing() && remoteSnapshot.Revision == 0 {
+	if (manager.storage.IsFastListing() && remoteSnapshot.Revision == 0) {
 		LOG_INFO("BACKUP_LIST", "Listing all chunks")
 		allChunks, _ := manager.SnapshotManager.ListAllFiles(manager.storage, "chunks/")
 
@@ -222,7 +222,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 
 	var totalModifiedFileSize int64    // total size of modified files
 	var uploadedModifiedFileSize int64 // portions that have been uploaded (including cache hits)
-	var preservedFileSize int64        // total size of unmodified files
+	var preservedFileSize int64 // total size of unmodified files
 
 	localSnapshot := CreateEmptySnapshot(manager.snapshotID)
 	localSnapshot.Revision = remoteSnapshot.Revision + 1
@@ -239,7 +239,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 		// List local files
 		defer CatchLogException()
 		localSnapshot.ListLocalFiles(shadowTop, manager.nobackupFile, manager.filtersFile, manager.excludeByAttribute, localListingChannel, &skippedDirectories, &skippedFiles)
-	}()
+	} ()
 
 	go func() {
 		// List remote files
@@ -261,7 +261,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 			})
 		}
 		close(remoteListingChannel)
-	}()
+	} ()
 
 	// Create the local file list
 	localEntryList, err := CreateEntryList(manager.snapshotID, manager.cachePath, maximumInMemoryEntries)
@@ -275,7 +275,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 	var remoteEntry *Entry
 	remoteListingOK := true
 	for {
-		localEntry := <-localListingChannel
+		localEntry := <- localListingChannel
 		if localEntry == nil {
 			break
 		}
@@ -289,7 +289,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 				compareResult = localEntry.Compare(remoteEntry)
 			} else {
 				if remoteListingOK {
-					remoteEntry, remoteListingOK = <-remoteListingChannel
+					remoteEntry, remoteListingOK = <- remoteListingChannel
 				}
 				if !remoteListingOK {
 					compareResult = -1
@@ -304,7 +304,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 			remoteEntry = nil
 		}
 
-		if compareResult == 0 {
+		if compareResult == 0  {
 			// No need to check if it is in hash mode -- in that case remote listing is nil
 			if localEntry.IsSameAs(remoteEntry) && localEntry.IsFile() {
 				if localEntry.Size > 0 {
@@ -339,8 +339,8 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 			// compareResult must be < 0; the local file is new
 			totalModifiedFileSize += localEntry.Size
 			if localEntry.Size > 0 {
-				// A size of -1 indicates this is a modified file that will be uploaded
-				localEntry.Size = -1
+					// A size of -1 indicates this is a modified file that will be uploaded
+					localEntry.Size = -1
 			}
 		}
 
@@ -448,7 +448,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 
 		_, found := chunkCache[chunkID]
 		if found {
-			if time.Now().Unix()-lastUploadingTime > keepUploadAlive {
+			if time.Now().Unix() - lastUploadingTime > keepUploadAlive {
 				LOG_INFO("UPLOAD_KEEPALIVE", "Skip chunk cache to keep connection alive")
 				found = false
 			}
@@ -558,7 +558,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 	if showStatistics {
 
 		LOG_INFO("BACKUP_STATS", "Files: %d total, %s bytes; %d new, %s bytes",
-			localEntryList.NumberOfEntries-int64(len(skippedFiles)),
+			localEntryList.NumberOfEntries - int64(len(skippedFiles)),
 			PrettyNumber(preservedFileSize+uploadedFileSize),
 			len(localEntryList.ModifiedEntries), PrettyNumber(uploadedFileSize))
 
@@ -686,7 +686,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 		// List local files
 		defer CatchLogException()
 		localSnapshot.ListLocalFiles(top, manager.nobackupFile, manager.filtersFile, manager.excludeByAttribute, localListingChannel, nil, nil)
-	}()
+	} ()
 
 	remoteSnapshot := manager.SnapshotManager.DownloadSnapshot(manager.snapshotID, revision)
 	manager.SnapshotManager.DownloadSnapshotSequences(remoteSnapshot)
@@ -698,47 +698,13 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 			return true
 		})
 		close(remoteListingChannel)
-	}()
+	} ()
 
 	var localEntry *Entry
 	localListingOK := true
 
-	type hardLinkEntry struct {
-		entry     *Entry
-		willExist bool
-	}
-	var hardLinkTable []hardLinkEntry
-	var hardLinks []*Entry
-
-	restoreHardlink := func(entry *Entry, fullPath string) bool {
-		if entry.IsHardlinkRoot() {
-			hardLinkTable[len(hardLinkTable)-1].willExist = true
-		} else if entry.IsHardlinkedFrom() {
-			i, err := entry.GetHardlinkId()
-			if err != nil {
-				LOG_ERROR("RESTORE_HARDLINK", "Decode error for hardlinked entry %s, %v", entry.Path, err)
-				return false
-			}
-			if !hardLinkTable[i].willExist {
-				hardLinkTable[i] = hardLinkEntry{entry, true}
-			} else {
-				sourcePath := joinPath(top, hardLinkTable[i].entry.Path)
-				LOG_INFO("RESTORE_HARDLINK", "Hard linking %s to %s", fullPath, sourcePath)
-				if err := MakeHardlink(sourcePath, fullPath); err != nil {
-					LOG_ERROR("RESTORE_HARDLINK", "Failed to create hard link %s to %s %v", fullPath, sourcePath, err)
-				}
-				return true
-			}
-		}
-		return false
-	}
-
 	for remoteEntry := range remoteListingChannel {
 
-		if remoteEntry.IsHardlinkRoot() {
-			hardLinkTable = append(hardLinkTable, hardLinkEntry{remoteEntry, false})
-		}
-
 		if len(patterns) > 0 && !MatchPath(remoteEntry.Path, patterns) {
 			continue
 		}
@@ -748,7 +714,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 
 		for {
 			if localEntry == nil && localListingOK {
-				localEntry, localListingOK = <-localListingChannel
+				localEntry, localListingOK = <- localListingChannel
 			}
 			if localEntry == nil {
 				compareResult = 1
@@ -775,39 +741,26 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 		}
 
 		fullPath := joinPath(top, remoteEntry.Path)
-
 		if remoteEntry.IsLink() {
-			if stat, _ := os.Lstat(fullPath); stat != nil {
+			stat, err := os.Lstat(fullPath)
+			if stat != nil {
 				if stat.Mode()&os.ModeSymlink != 0 {
 					isRegular, link, err := Readlink(fullPath)
 					if err == nil && link == remoteEntry.Link && !isRegular {
 						remoteEntry.RestoreMetadata(fullPath, nil, setOwner)
-						if remoteEntry.IsHardlinkRoot() {
-							hardLinkTable[len(hardLinkTable)-1].willExist = true
-						}
 						continue
 					}
 				}
 
-				if !overwrite {
-					LOG_WERROR(allowFailures, "DOWNLOAD_OVERWRITE",
-						"File %s already exists.  Please specify the -overwrite option to overwrite", remoteEntry.Path)
-					continue
-				}
-
 				os.Remove(fullPath)
 			}
 
-			if restoreHardlink(remoteEntry, fullPath) {
-				continue
-			}
-
-			if err := os.Symlink(remoteEntry.Link, fullPath); err != nil {
+			err = os.Symlink(remoteEntry.Link, fullPath)
+			if err != nil {
 				LOG_ERROR("RESTORE_SYMLINK", "Can't create symlink %s: %v", remoteEntry.Path, err)
 				return 0
 			}
 			remoteEntry.RestoreMetadata(fullPath, nil, setOwner)
-
 			LOG_TRACE("DOWNLOAD_DONE", "Symlink %s updated", remoteEntry.Path)
 		} else if remoteEntry.IsDir() {
 
@@ -829,48 +782,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 			}
 			remoteEntry.RestoreEarlyDirFlags(fullPath)
 			directoryEntries = append(directoryEntries, remoteEntry)
-		} else if remoteEntry.IsSpecial() {
-			if stat, _ := os.Lstat(fullPath); stat != nil {
-				if remoteEntry.IsSameSpecial(stat) {
-					remoteEntry.RestoreMetadata(fullPath, nil, setOwner)
-					if remoteEntry.IsHardlinkRoot() {
-						hardLinkTable[len(hardLinkTable)-1].willExist = true
-					}
-				}
-				if !overwrite {
-					LOG_WERROR(allowFailures, "DOWNLOAD_OVERWRITE",
-						"File %s already exists.  Please specify the -overwrite option to overwrite", remoteEntry.Path)
-					continue
-				}
-				os.Remove(fullPath)
-			}
-
-			if restoreHardlink(remoteEntry, fullPath) {
-				continue
-			}
-
-			if err := remoteEntry.RestoreSpecial(fullPath); err != nil {
-				LOG_ERROR("RESTORE_SPECIAL", "Unable to restore special file %s: %v", remoteEntry.Path, err)
-				return 0
-			}
-			remoteEntry.RestoreMetadata(fullPath, nil, setOwner)
 		} else {
-			if remoteEntry.IsHardlinkRoot() {
-				hardLinkTable[len(hardLinkTable)-1].willExist = true
-			} else if remoteEntry.IsHardlinkedFrom() {
-				i, err := remoteEntry.GetHardlinkId()
-				if err != nil {
-					LOG_ERROR("RESTORE_HARDLINK", "Decode error for hardlinked entry %s, %v", remoteEntry.Path, err)
-					return 0
-				}
-				if !hardLinkTable[i].willExist {
-					hardLinkTable[i] = hardLinkEntry{remoteEntry, true}
-				} else {
-					hardLinks = append(hardLinks, remoteEntry)
-					continue
-				}
-			}
-
 			// We can't download files here since fileEntries needs to be sorted
 			fileEntries = append(fileEntries, remoteEntry)
 			totalFileSize += remoteEntry.Size
@@ -882,7 +794,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 	}
 
 	for localListingOK {
-		localEntry, localListingOK = <-localListingChannel
+		localEntry, localListingOK = <- localListingChannel
 		if localEntry != nil {
 			extraFiles = append(extraFiles, localEntry.Path)
 		}
@@ -990,38 +902,6 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 		file.RestoreMetadata(fullPath, nil, setOwner)
 	}
 
-	for _, linkEntry := range hardLinks {
-
-		i, _ := linkEntry.GetHardlinkId()
-		sourcePath := joinPath(top, hardLinkTable[i].entry.Path)
-		fullPath := joinPath(top, linkEntry.Path)
-
-		if stat, _ := os.Lstat(fullPath); stat != nil {
-			sourceStat, _ := os.Lstat(sourcePath)
-			if os.SameFile(stat, sourceStat) {
-				continue
-			}
-
-			if sourceStat == nil {
-				LOG_WERROR(allowFailures, "RESTORE_HARDLINK",
-					"Target %s for hardlink %s is missing", sourcePath, linkEntry.Path)
-				continue
-			}
-			if !overwrite {
-				LOG_WERROR(allowFailures, "DOWNLOAD_OVERWRITE",
-					"File %s already exists.  Please specify the -overwrite option to overwrite", linkEntry.Path)
-				continue
-			}
-			os.Remove(fullPath)
-		}
-
-		LOG_DEBUG("RESTORE_HARDLINK", "Hard linking %s to %s", fullPath, sourcePath)
-		if err := MakeHardlink(sourcePath, fullPath); err != nil {
-			LOG_ERROR("RESTORE_HARDLINK", "Failed to create hard link %s to %s", fullPath, sourcePath)
-			return 0
-		}
-	}
-
 	if deleteMode && len(patterns) == 0 {
 		// Reverse the order to make sure directories are empty before being deleted
 		for i := range extraFiles {
@@ -1167,19 +1047,14 @@ func (manager *BackupManager) UploadSnapshot(chunkOperator *ChunkOperator, top s
 	encoder := msgpack.NewEncoder(buffer)
 	metadataChunkMaker := CreateMetaDataChunkMaker(manager.config, metadataChunkSize)
 
-	var chunkHashes []string
+    var chunkHashes  []string
 	var chunkLengths []int
 	lastChunk := -1
 
 	lastEndChunk := 0
 
-	type hardLinkEntry struct {
-		entry      *Entry
-		startChunk int
-	}
-	var hardLinkTable []hardLinkEntry
-
 	uploadEntryInfoFunc := func(entry *Entry) error {
+
 		if entry.IsFile() && entry.Size > 0 {
 			delta := entry.StartChunk - len(chunkHashes) + 1
 			if entry.StartChunk != lastChunk {
@@ -1197,38 +1072,10 @@ func (manager *BackupManager) UploadSnapshot(chunkOperator *ChunkOperator, top s
 			entry.StartChunk -= delta
 			entry.EndChunk -= delta
 
-			if entry.IsHardlinkRoot() {
-				LOG_DEBUG("SNAPSHOT_UPLOAD", "Hard link root %s %v %v", entry.Path, entry.StartChunk, entry.EndChunk)
-				hardLinkTable = append(hardLinkTable, hardLinkEntry{entry, entry.StartChunk})
-			}
-
 			delta = entry.EndChunk - entry.StartChunk
 			entry.StartChunk -= lastEndChunk
 			lastEndChunk = entry.EndChunk
 			entry.EndChunk = delta
-		} else if entry.IsHardlinkedFrom() && !entry.IsLink() {
-			i, err := entry.GetHardlinkId()
-			if err != nil {
-				LOG_ERROR("SNAPSHOT_UPLOAD", "Decode error for hardlinked entry %s, %v", entry.Link, err)
-				return err
-			}
-
-			targetEntry := hardLinkTable[i].entry
-			var startChunk, endChunk int
-
-			if targetEntry.Size > 0 {
-				startChunk = hardLinkTable[i].startChunk - lastEndChunk
-				endChunk = targetEntry.EndChunk
-			}
-			entry = entry.HardLinkTo(targetEntry, startChunk, endChunk)
-
-			if targetEntry.Size > 0 {
-				lastEndChunk = hardLinkTable[i].startChunk + endChunk
-			}
-
-			LOG_DEBUG("SNAPSHOT_UPLOAD", "Uploading cloned hardlink for %s to %s (%v %v)", entry.Path, targetEntry.Path, startChunk, endChunk)
-		} else if entry.IsHardlinkRoot() {
-			hardLinkTable = append(hardLinkTable, hardLinkEntry{entry, 0})
 		}
 
 		buffer.Reset()
@@ -1297,10 +1144,9 @@ func (manager *BackupManager) UploadSnapshot(chunkOperator *ChunkOperator, top s
 // Restore downloads a file from the storage.  If 'inPlace' is false, the download file is saved first to a temporary
 // file under the .duplicacy directory and then replaces the existing one.  Otherwise, the existing file will be
 // overwritten directly.
-// Return: true, nil:    Restored file;
-//
-//	false, nil:   Skipped file;
-//	false, error: Failure to restore file (only if allowFailures == true)
+// Return: true, nil:    Restored file; 
+//         false, nil:   Skipped file; 
+//         false, error: Failure to restore file (only if allowFailures == true)
 func (manager *BackupManager) RestoreFile(chunkDownloader *ChunkDownloader, chunkMaker *ChunkMaker, entry *Entry, top string, inPlace bool, overwrite bool,
 	showStatistics bool, totalFileSize int64, downloadedFileSize int64, startTime int64, allowFailures bool) (bool, error) {
 
@@ -1476,7 +1322,7 @@ func (manager *BackupManager) RestoreFile(chunkDownloader *ChunkDownloader, chun
 			// fileHash != entry.Hash, warn/error depending on -overwrite option
 			if !overwrite && !isNewFile {
 				LOG_WERROR(allowFailures, "DOWNLOAD_OVERWRITE",
-					"File %s already exists.  Please specify the -overwrite option to overwrite", entry.Path)
+							"File %s already exists.  Please specify the -overwrite option to overwrite", entry.Path)
 				return false, fmt.Errorf("file exists")
 			}
 
@@ -1723,7 +1569,7 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 
 	if otherManager.config.DataShards != 0 && otherManager.config.ParityShards != 0 {
 		LOG_INFO("BACKUP_ERASURECODING", "Erasure coding is enabled for the destination storage with %d data shards and %d parity shards",
-			otherManager.config.DataShards, otherManager.config.ParityShards)
+		         otherManager.config.DataShards, otherManager.config.ParityShards)
 	}
 
 	if otherManager.config.rsaPublicKey != nil && len(otherManager.config.FileKey) > 0 {
@@ -1824,15 +1670,15 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 		LOG_TRACE("SNAPSHOT_COPY", "Copying snapshot %s at revision %d", snapshot.ID, snapshot.Revision)
 
 		for _, chunkHash := range snapshot.FileSequence {
-			chunks[chunkHash] = true // The chunk is a snapshot chunk
+			chunks[chunkHash] = true  // The chunk is a snapshot chunk
 		}
 
 		for _, chunkHash := range snapshot.ChunkSequence {
-			chunks[chunkHash] = true // The chunk is a snapshot chunk
+			chunks[chunkHash] = true  // The chunk is a snapshot chunk
 		}
 
 		for _, chunkHash := range snapshot.LengthSequence {
-			chunks[chunkHash] = true // The chunk is a snapshot chunk
+			chunks[chunkHash] = true  // The chunk is a snapshot chunk
 		}
 
 		description := manager.SnapshotManager.DownloadSequence(snapshot.ChunkSequence)
@@ -1845,7 +1691,7 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 
 		for _, chunkHash := range snapshot.ChunkHashes {
 			if _, found := chunks[chunkHash]; !found {
-				chunks[chunkHash] = false // The chunk is a file chunk
+				chunks[chunkHash] = false  // The chunk is a file chunk
 			}
 		}
 
@@ -1877,7 +1723,7 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 		}
 	}
 
-	LOG_INFO("SNAPSHOT_COPY", "Chunks to copy: %d, to skip: %d, total: %d", len(chunksToCopy), len(chunks)-len(chunksToCopy), len(chunks))
+	LOG_INFO("SNAPSHOT_COPY", "Chunks to copy: %d, to skip: %d, total: %d", len(chunksToCopy), len(chunks) - len(chunksToCopy), len(chunks))
 
 	chunkDownloader := CreateChunkOperator(manager.config, manager.storage, nil, false, false, downloadingThreads, false)
 
@@ -1886,7 +1732,7 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 
 	copiedChunks := 0
 	chunkUploader := CreateChunkOperator(otherManager.config, otherManager.storage, nil, false, false, uploadingThreads, false)
-	chunkUploader.UploadCompletionFunc = func(chunk *Chunk, chunkIndex int, skipped bool, chunkSize int, uploadSize int) {
+	chunkUploader.UploadCompletionFunc =  func(chunk *Chunk, chunkIndex int, skipped bool, chunkSize int, uploadSize int) {
 		action := "Skipped"
 		if !skipped {
 			copiedChunks++
@@ -1897,11 +1743,11 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 
 		elapsedTime := time.Now().Sub(startTime).Seconds()
 		speed := int64(float64(atomic.LoadInt64(&uploadedBytes)) / elapsedTime)
-		remainingTime := int64(float64(len(chunksToCopy)-chunkIndex-1) / float64(chunkIndex+1) * elapsedTime)
-		percentage := float64(chunkIndex+1) / float64(len(chunksToCopy)) * 100.0
+		remainingTime := int64(float64(len(chunksToCopy) - chunkIndex - 1) / float64(chunkIndex + 1) * elapsedTime)
+		percentage := float64(chunkIndex + 1) / float64(len(chunksToCopy)) * 100.0
 		LOG_INFO("COPY_PROGRESS", "%s chunk %s (%d/%d) %sB/s %s %.1f%%",
-			action, chunk.GetID(), chunkIndex+1, len(chunksToCopy),
-			PrettySize(speed), PrettyTime(remainingTime), percentage)
+				action, chunk.GetID(), chunkIndex + 1, len(chunksToCopy),
+				PrettySize(speed), PrettyTime(remainingTime), percentage)
 		otherManager.config.PutChunk(chunk)
 	}
 
@@ -1924,7 +1770,7 @@ func (manager *BackupManager) CopySnapshots(otherManager *BackupManager, snapsho
 	chunkDownloader.Stop()
 	chunkUploader.Stop()
 
-	LOG_INFO("SNAPSHOT_COPY", "Copied %d new chunks and skipped %d existing chunks", copiedChunks, len(chunks)-copiedChunks)
+	LOG_INFO("SNAPSHOT_COPY", "Copied %d new chunks and skipped %d existing chunks", copiedChunks, len(chunks) - copiedChunks)
 
 	for _, snapshot := range snapshots {
 		if revisionMap[snapshot.ID][snapshot.Revision] == false {

src/duplicacy_entry.go

@@ -4,11 +4,8 @@
 package duplicacy
 
 import (
-	"bytes"
-	"crypto/sha256"
 	"encoding/base64"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"os"
@@ -18,15 +15,12 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"syscall"
 	"time"
+	"bytes"
+	"crypto/sha256"
 
-	"github.com/vmihailenco/msgpack"
-)
+    "github.com/vmihailenco/msgpack"
 
-const (
-	entrySymHardLinkRootChunkMarker   = -72
-	entrySymHardLinkTargetChunkMarker = -73
 )
 
 // This is the hidden directory in the repository for storing various files.
@@ -116,36 +110,15 @@ func (entry *Entry) Copy() *Entry {
 		UID: entry.UID,
 		GID: entry.GID,
 
-		StartChunk:  entry.StartChunk,
+		StartChunk: entry.StartChunk,
 		StartOffset: entry.StartOffset,
-		EndChunk:    entry.EndChunk,
-		EndOffset:   entry.EndOffset,
+		EndChunk: entry.EndChunk,
+		EndOffset: entry.EndOffset,
 
 		Attributes: entry.Attributes,
 	}
 }
 
-func (entry *Entry) HardLinkTo(target *Entry, startChunk int, endChunk int) *Entry {
-	return &Entry{
-		Path: entry.Path,
-		Size: target.Size,
-		Time: target.Time,
-		Mode: target.Mode,
-		Link: entry.Link,
-		Hash: target.Hash,
-
-		UID: target.UID,
-		GID: target.GID,
-
-		StartChunk:  startChunk,
-		StartOffset: target.StartOffset,
-		EndChunk:    endChunk,
-		EndOffset:   target.EndOffset,
-
-		Attributes: target.Attributes,
-	}
-}
-
 // CreateEntryFromJSON creates an entry from a json description.
 func (entry *Entry) UnmarshalJSON(description []byte) (err error) {
 
@@ -389,12 +362,12 @@ func (entry *Entry) EncodeMsgpack(encoder *msgpack.Encoder) error {
 
 	if entry.Attributes != nil {
 		attributes := make([]string, numberOfAttributes)
-		i := 0
-		for attribute := range *entry.Attributes {
-			attributes[i] = attribute
-			i++
-		}
-		sort.Strings(attributes)
+        i := 0
+        for attribute := range *entry.Attributes {
+            attributes[i] = attribute
+            i++
+        }
+        sort.Strings(attributes)
 		for _, attribute := range attributes {
 			err = encoder.EncodeString(attribute)
 			if err != nil {
@@ -407,7 +380,7 @@ func (entry *Entry) EncodeMsgpack(encoder *msgpack.Encoder) error {
 		}
 	}
 
-	return nil
+    return nil
 }
 
 func (entry *Entry) DecodeMsgpack(decoder *msgpack.Decoder) error {
@@ -515,46 +488,18 @@ func (entry *Entry) IsLink() bool {
 	return entry.Mode&uint32(os.ModeSymlink) != 0
 }
 
-func (entry *Entry) IsSpecial() bool {
-	return entry.Mode&uint32(os.ModeNamedPipe|os.ModeDevice|os.ModeCharDevice) != 0
-}
-
-func (entry *Entry) IsFileOrSpecial() bool {
-	return entry.Mode&uint32(os.ModeDir|os.ModeSymlink|os.ModeIrregular) == 0
-}
-
 func (entry *Entry) IsComplete() bool {
 	return entry.Size >= 0
 }
 
-func (entry *Entry) IsHardlinkedFrom() bool {
-	return (entry.IsFileOrSpecial() && len(entry.Link) > 0 && entry.Link != "/") || (entry.IsLink() && entry.StartChunk == entrySymHardLinkTargetChunkMarker)
-}
-
-func (entry *Entry) IsHardlinkRoot() bool {
-	return (entry.IsFileOrSpecial() && entry.Link == "/") || (entry.IsLink() && entry.StartChunk == entrySymHardLinkRootChunkMarker)
-}
-
-func (entry *Entry) GetHardlinkId() (int, error) {
-	if entry.IsLink() {
-		if entry.StartChunk != entrySymHardLinkTargetChunkMarker {
-			return 0, errors.New("Symlink entry not marked as hardlinked")
-		}
-		return entry.StartOffset, nil
-	} else {
-		i, err := strconv.ParseUint(entry.Link, 16, 64)
-		return int(i), err
-	}
-}
-
 func (entry *Entry) GetPermissions() os.FileMode {
 	return os.FileMode(entry.Mode) & fileModeMask
 }
 
 func (entry *Entry) GetParent() string {
 	path := entry.Path
-	if path != "" && path[len(path)-1] == '/' {
-		path = path[:len(path)-1]
+	if path != "" && path[len(path) - 1] == '/' {
+		path = path[:len(path) - 1]
 	}
 	i := strings.LastIndex(path, "/")
 	if i == -1 {
@@ -605,10 +550,6 @@ func (entry *Entry) RestoreMetadata(fullPath string, fileInfo *os.FileInfo, setO
 		}
 	}
 
-	if entry.Attributes != nil && len(*entry.Attributes) > 0 {
-		entry.SetAttributesToFile(fullPath)
-	}
-
 	// Only set the time if the file is not a symlink
 	if !entry.IsLink() && (*fileInfo).ModTime().Unix() != entry.Time {
 		modifiedTime := time.Unix(entry.Time, 0)
@@ -619,6 +560,10 @@ func (entry *Entry) RestoreMetadata(fullPath string, fileInfo *os.FileInfo, setO
 		}
 	}
 
+	if entry.Attributes != nil && len(*entry.Attributes) > 0 {
+		entry.SetAttributesToFile(fullPath)
+	}
+
 	return true
 }
 
@@ -651,7 +596,7 @@ func ComparePaths(left string, right string) int {
 	for i := p; i < len(left); i++ {
 		c3 = left[i]
 		if c3 == '/' {
-			last1 = i == len(left)-1
+			last1 = i == len(left) - 1
 			break
 		}
 	}
@@ -661,7 +606,7 @@ func ComparePaths(left string, right string) int {
 	for i := p; i < len(right); i++ {
 		c4 = right[i]
 		if c4 == '/' {
-			last2 = i == len(right)-1
+			last2 = i == len(right) - 1
 			break
 		}
 	}
@@ -749,27 +694,10 @@ func (files FileInfoCompare) Less(i, j int) bool {
 	}
 }
 
-type listEntryLinkKey struct {
-	dev uint64
-	ino uint64
-}
-
-type ListingState struct {
-	linkIndex int
-	linkTable map[listEntryLinkKey]int // map unique inode details to initially found path
-}
-
-func NewListingState() *ListingState {
-	return &ListingState{
-		linkTable: make(map[listEntryLinkKey]int),
-	}
-}
-
 // ListEntries returns a list of entries representing file and subdirectories under the directory 'path'.  Entry paths
 // are normalized as relative to 'top'.  'patterns' are used to exclude or include certain files.
-func ListEntries(top string, path string, patterns []string, nobackupFile string, excludeByAttribute bool,
-	listingState *ListingState,
-	listingChannel chan *Entry) (directoryList []*Entry, skippedFiles []string, err error) {
+func ListEntries(top string, path string, patterns []string, nobackupFile string, excludeByAttribute bool, listingChannel chan *Entry) (directoryList []*Entry,
+	skippedFiles []string, err error) {
 
 	LOG_DEBUG("LIST_ENTRIES", "Listing %s", path)
 
@@ -807,44 +735,10 @@ func ListEntries(top string, path string, patterns []string, nobackupFile string
 		if f.Name() == DUPLICACY_DIRECTORY {
 			continue
 		}
-		if f.Mode()&os.ModeSocket != 0 {
-			continue
-		}
-
 		entry := CreateEntryFromFileInfo(f, normalizedPath)
 		if len(patterns) > 0 && !MatchPath(entry.Path, patterns) {
 			continue
 		}
-
-		var linkKey *listEntryLinkKey
-
-		if runtime.GOOS != "windows" && !entry.IsDir() {
-			if stat := f.Sys().(*syscall.Stat_t); stat != nil && stat.Nlink > 1 {
-				k := listEntryLinkKey{dev: uint64(stat.Dev), ino: uint64(stat.Ino)}
-				if linkIndex, seen := listingState.linkTable[k]; seen {
-					if linkIndex == -1 {
-						LOG_DEBUG("LIST_EXCLUDE", "%s is excluded by attribute (hardlink)", entry.Path)
-						continue
-					}
-					entry.Size = 0
-					if entry.IsLink() {
-						entry.StartChunk = entrySymHardLinkTargetChunkMarker
-						entry.StartOffset = linkIndex
-					} else {
-						entry.Link = strconv.FormatInt(int64(linkIndex), 16)
-					}
-				} else {
-					if entry.IsLink() {
-						entry.StartChunk = entrySymHardLinkRootChunkMarker
-					} else {
-						entry.Link = "/"
-					}
-					listingState.linkTable[k] = -1
-					linkKey = &k
-				}
-			}
-		}
-
 		if entry.IsLink() {
 			isRegular := false
 			isRegular, entry.Link, err = Readlink(joinPath(top, entry.Path))
@@ -875,12 +769,6 @@ func ListEntries(top string, path string, patterns []string, nobackupFile string
 				}
 				entry = newEntry
 			}
-		} else if entry.IsSpecial() {
-			if !entry.ReadSpecial(f) {
-				LOG_WARN("LIST_DEV", "Failed to save device node %s", entry.Path)
-				skippedFiles = append(skippedFiles, entry.Path)
-				continue
-			}
 		}
 
 		entry.ReadAttributes(top)
@@ -890,9 +778,10 @@ func ListEntries(top string, path string, patterns []string, nobackupFile string
 			continue
 		}
 
-		if linkKey != nil {
-			listingState.linkTable[*linkKey] = listingState.linkIndex
-			listingState.linkIndex++
+		if f.Mode()&(os.ModeNamedPipe|os.ModeSocket|os.ModeDevice) != 0 {
+			LOG_WARN("LIST_SKIP", "Skipped non-regular file %s", entry.Path)
+			skippedFiles = append(skippedFiles, entry.Path)
+			continue
 		}
 
 		if entry.IsDir() {

src/duplicacy_entrylist.go

@@ -111,12 +111,12 @@ func (entryList *EntryList)createOnDiskFile() error {
 // Add an entry to the entry list
 func (entryList *EntryList)AddEntry(entry *Entry) error {
 
-	if entry.IsFile() {
+	if !entry.IsDir() && !entry.IsLink() {
 		entryList.NumberOfEntries++
 	}
 
 	if !entry.IsComplete() {
-		if !entry.IsFile() {
+		if entry.IsDir() || entry.IsLink() {
 			entry.Size = 0
 		} else {
 			modifiedEntry := ModifiedEntry {

src/duplicacy_snapshot.go

@@ -68,7 +68,6 @@ func (snapshot *Snapshot) ListLocalFiles(top string, nobackupFile string,
 								         skippedDirectories *[]string, skippedFiles *[]string) {
 
 	var patterns []string
-	listingState := NewListingState()
 
 	if filtersFile == "" {
 		filtersFile = joinPath(GetDuplicacyPreferencePath(), "filters")
@@ -82,7 +81,7 @@ func (snapshot *Snapshot) ListLocalFiles(top string, nobackupFile string,
 
 		directory := directories[len(directories)-1]
 		directories = directories[:len(directories)-1]
-		subdirectories, skipped, err := ListEntries(top, directory.Path, patterns, nobackupFile, excludeByAttribute, listingState, listingChannel)
+		subdirectories, skipped, err := ListEntries(top, directory.Path, patterns, nobackupFile, excludeByAttribute, listingChannel)
 		if err != nil {
 			if directory.Path == "" {
 				LOG_ERROR("LIST_FAILURE", "Failed to list the repository root: %v", err)

src/duplicacy_utils.go

@@ -7,15 +7,14 @@ package duplicacy
 import (
 	"bufio"
 	"crypto/sha256"
-	"encoding/json"
 	"fmt"
 	"io"
 	"os"
 	"regexp"
-	"runtime"
 	"strconv"
 	"strings"
 	"time"
+	"runtime"
 
 	"github.com/gilbertchen/gopass"
 	"golang.org/x/crypto/pbkdf2"
@@ -57,7 +56,7 @@ func IsEmptyFilter(pattern string) bool {
 }
 
 func IsUnspecifiedFilter(pattern string) bool {
-	if pattern[0] != '+' && pattern[0] != '-' && !strings.HasPrefix(pattern, "i:") && !strings.HasPrefix(pattern, "e:") {
+	if pattern[0] != '+' && pattern[0] != '-' && !strings.HasPrefix(pattern, "i:") && !strings.HasPrefix(pattern, "e:")  {
 		return true
 	} else {
 		return false
@@ -276,6 +275,7 @@ func SavePassword(preference Preference, passwordType string, password string) {
 // The following code was modified from the online article  'Matching Wildcards: An Algorithm', by Kirk J. Krauss,
 // Dr. Dobb's, August 26, 2008. However, the version in the article doesn't handle cases like matching 'abcccd'
 // against '*ccd', and the version here fixed that issue.
+//
 func matchPattern(text string, pattern string) bool {
 
 	textLength := len(text)
@@ -469,39 +469,8 @@ func PrintMemoryUsage() {
 		runtime.ReadMemStats(&m)
 
 		LOG_INFO("MEMORY_STATS", "Currently allocated: %s, total allocated: %s, system memory: %s, number of GCs: %d",
-			PrettySize(int64(m.Alloc)), PrettySize(int64(m.TotalAlloc)), PrettySize(int64(m.Sys)), m.NumGC)
+		         PrettySize(int64(m.Alloc)), PrettySize(int64(m.TotalAlloc)), PrettySize(int64(m.Sys)), m.NumGC)
 
 		time.Sleep(time.Second)
 	}
-}
-
-func (entry *Entry) dump() map[string]interface{} {
-
-	object := make(map[string]interface{})
-
-	object["path"] = entry.Path
-	object["size"] = entry.Size
-	object["time"] = entry.Time
-	object["mode"] = entry.Mode
-	object["hash"] = entry.Hash
-	object["link"] = entry.Link
-
-	object["content"] = fmt.Sprintf("%d:%d:%d:%d",
-		entry.StartChunk, entry.StartOffset, entry.EndChunk, entry.EndOffset)
-
-	if entry.UID != -1 && entry.GID != -1 {
-		object["uid"] = entry.UID
-		object["gid"] = entry.GID
-	}
-
-	if entry.Attributes != nil && len(*entry.Attributes) > 0 {
-		object["attributes"] = entry.Attributes
-	}
-
-	return object
-}
-
-func (entry *Entry) dumpString() string {
-	data, _ := json.Marshal(entry.dump())
-	return string(data)
-}
+}

src/duplicacy_utils_bsd.go

@@ -0,0 +1,53 @@
+// Copyright (c) Acrosync LLC. All rights reserved.
+// Free for personal use and commercial trial
+// Commercial use requires per-user licenses available from https://duplicacy.com
+
+//go:build freebsd || netbsd || darwin
+// +build freebsd netbsd darwin
+
+package duplicacy
+
+import (
+	"encoding/binary"
+	"os"
+	"syscall"
+)
+
+const bsdFileFlagsKey = "\x00bf"
+
+func (entry *Entry) ReadFileFlags(f *os.File) error {
+	fileInfo, err := f.Stat()
+	if err != nil {
+		return err
+	}
+	stat, ok := fileInfo.Sys().(*syscall.Stat_t)
+	if ok && stat.Flags != 0 {
+		if entry.Attributes == nil {
+			entry.Attributes = &map[string][]byte{}
+		}
+		v := make([]byte, 4)
+		binary.LittleEndian.PutUint32(v, stat.Flags)
+		(*entry.Attributes)[bsdFileFlagsKey] = v
+		LOG_DEBUG("ATTR_READ", "Read flags 0x%x for %s", stat.Flags, entry.Path)
+	}
+	return nil
+}
+
+func (entry *Entry) RestoreEarlyDirFlags(path string) error {
+	return nil
+}
+
+func (entry *Entry) RestoreEarlyFileFlags(f *os.File) error {
+	return nil
+}
+
+func (entry *Entry) RestoreLateFileFlags(f *os.File) error {
+	if entry.Attributes == nil {
+		return nil
+	}
+	if v, have := (*entry.Attributes)[bsdFileFlagsKey]; have {
+		LOG_DEBUG("ATTR_RESTORE", "Restore flags 0x%x for %s", binary.LittleEndian.Uint32(v), entry.Path)
+		return syscall.Fchflags(int(f.Fd()), int(binary.LittleEndian.Uint32(v)))
+	}
+	return nil
+}

src/duplicacy_utils_bsd_common.go

@@ -1,94 +0,0 @@
-// Copyright (c) Acrosync LLC. All rights reserved.
-// Free for personal use and commercial trial
-// Commercial use requires per-user licenses available from https://duplicacy.com
-
-//go:build freebsd || netbsd || darwin
-// +build freebsd netbsd darwin
-
-package duplicacy
-
-import (
-	"bytes"
-	"encoding/binary"
-	"os"
-	"path/filepath"
-	"syscall"
-
-	"github.com/pkg/xattr"
-)
-
-const bsdFileFlagsKey = "\x00bf"
-
-func (entry *Entry) ReadAttributes(top string) {
-	fullPath := filepath.Join(top, entry.Path)
-	fileInfo, err := os.Lstat(fullPath)
-	if err != nil {
-		return
-	}
-
-	if !entry.IsSpecial() {
-		attributes, _ := xattr.LList(fullPath)
-		if len(attributes) > 0 {
-			entry.Attributes = &map[string][]byte{}
-			for _, name := range attributes {
-				attribute, err := xattr.LGet(fullPath, name)
-				if err == nil {
-					(*entry.Attributes)[name] = attribute
-				}
-			}
-		}
-	}
-	if err := entry.readFileFlags(fileInfo); err != nil {
-		LOG_INFO("ATTR_BACKUP", "Could not backup flags for file %s: %v", fullPath, err)
-	}
-}
-
-func (entry *Entry) SetAttributesToFile(fullPath string) {
-	if !entry.IsSpecial() {
-		names, _ := xattr.LList(fullPath)
-		for _, name := range names {
-			newAttribute, found := (*entry.Attributes)[name]
-			if found {
-				oldAttribute, _ := xattr.LGet(fullPath, name)
-				if !bytes.Equal(oldAttribute, newAttribute) {
-					xattr.LSet(fullPath, name, newAttribute)
-				}
-				delete(*entry.Attributes, name)
-			} else {
-				xattr.LRemove(fullPath, name)
-			}
-		}
-
-		for name, attribute := range *entry.Attributes {
-			if len(name) > 0 && name[0] == '\x00' {
-				continue
-			}
-			xattr.LSet(fullPath, name, attribute)
-		}
-	}
-	if err := entry.restoreLateFileFlags(fullPath); err != nil {
-		LOG_DEBUG("ATTR_RESTORE", "Could not restore flags for file %s: %v", fullPath, err)
-	}
-}
-
-func (entry *Entry) readFileFlags(fileInfo os.FileInfo) error {
-	stat, ok := fileInfo.Sys().(*syscall.Stat_t)
-	if ok && stat.Flags != 0 {
-		if entry.Attributes == nil {
-			entry.Attributes = &map[string][]byte{}
-		}
-		v := make([]byte, 4)
-		binary.LittleEndian.PutUint32(v, stat.Flags)
-		(*entry.Attributes)[bsdFileFlagsKey] = v
-		LOG_DEBUG("ATTR_READ", "Read flags 0x%x for %s", stat.Flags, entry.Path)
-	}
-	return nil
-}
-
-func (entry *Entry) RestoreEarlyDirFlags(path string) error {
-	return nil
-}
-
-func (entry *Entry) RestoreEarlyFileFlags(f *os.File) error {
-	return nil
-}

src/duplicacy_utils_darwin.go

@@ -5,29 +5,10 @@
 package duplicacy
 
 import (
-	"encoding/binary"
-	"os"
 	"strings"
-	"syscall"
 )
 
 func excludedByAttribute(attributes map[string][]byte) bool {
 	value, ok := attributes["com.apple.metadata:com_apple_backup_excludeItem"]
 	return ok && strings.Contains(string(value), "com.apple.backupd")
 }
-
-func (entry *Entry) restoreLateFileFlags(path string) error {
-	if entry.Attributes == nil {
-		return nil
-	}
-	if v, have := (*entry.Attributes)[bsdFileFlagsKey]; have {
-		f, err := os.OpenFile(path, os.O_RDONLY|syscall.O_SYMLINK, 0)
-		if err != nil {
-			return err
-		}
-		err = syscall.Fchflags(int(f.Fd()), int(binary.LittleEndian.Uint32(v)))
-		f.Close()
-		return err
-	}
-	return nil
-}

src/duplicacy_utils_linux.go

@@ -5,14 +5,10 @@
 package duplicacy
 
 import (
-	"bytes"
 	"encoding/binary"
 	"os"
-	"path/filepath"
 	"syscall"
 	"unsafe"
-
-	"github.com/pkg/xattr"
 )
 
 const (
@@ -51,116 +47,7 @@ func ioctl(f *os.File, request uintptr, attrp *uint32) error {
 	return nil
 }
 
-type xattrHandle struct {
-	f        *os.File
-	fullPath string
-}
-
-func (x xattrHandle) list() ([]string, error) {
-	if x.f != nil {
-		return xattr.FList(x.f)
-	} else {
-		return xattr.LList(x.fullPath)
-	}
-}
-
-func (x xattrHandle) get(name string) ([]byte, error) {
-	if x.f != nil {
-		return xattr.FGet(x.f, name)
-	} else {
-		return xattr.LGet(x.fullPath, name)
-	}
-}
-
-func (x xattrHandle) set(name string, value []byte) error {
-	if x.f != nil {
-		return xattr.FSet(x.f, name, value)
-	} else {
-		return xattr.LSet(x.fullPath, name, value)
-	}
-}
-
-func (x xattrHandle) remove(name string) error {
-	if x.f != nil {
-		return xattr.FRemove(x.f, name)
-	} else {
-		return xattr.LRemove(x.fullPath, name)
-	}
-}
-
-func (entry *Entry) ReadAttributes(top string) {
-	fullPath := filepath.Join(top, entry.Path)
-	x := xattrHandle{nil, fullPath}
-
-	if !entry.IsLink() {
-		var err error
-		x.f, err = os.OpenFile(fullPath, os.O_RDONLY|syscall.O_NOFOLLOW|syscall.O_NONBLOCK, 0)
-		if err != nil {
-			// FIXME: We really should return errors for failure to read
-			return
-		}
-	}
-
-	attributes, _ := x.list()
-
-	if len(attributes) > 0 {
-		entry.Attributes = &map[string][]byte{}
-	}
-	for _, name := range attributes {
-		attribute, err := x.get(name)
-		if err == nil {
-			(*entry.Attributes)[name] = attribute
-		}
-	}
-
-	if entry.IsFile() || entry.IsDir() {
-		if err := entry.readFileFlags(x.f); err != nil {
-			LOG_INFO("ATTR_BACKUP", "Could not backup flags for file %s: %v", fullPath, err)
-		}
-	}
-	x.f.Close()
-}
-
-func (entry *Entry) SetAttributesToFile(fullPath string) {
-	x := xattrHandle{nil, fullPath}
-	if !entry.IsLink() {
-		var err error
-		x.f, err = os.OpenFile(fullPath, os.O_RDONLY|syscall.O_NOFOLLOW, 0)
-		if err != nil {
-			return
-		}
-	}
-
-	names, _ := x.list()
-
-	for _, name := range names {
-		newAttribute, found := (*entry.Attributes)[name]
-		if found {
-			oldAttribute, _ := x.get(name)
-			if !bytes.Equal(oldAttribute, newAttribute) {
-				x.set(name, newAttribute)
-			}
-			delete(*entry.Attributes, name)
-		} else {
-			x.remove(name)
-		}
-	}
-
-	for name, attribute := range *entry.Attributes {
-		if len(name) > 0 && name[0] == '\x00' {
-			continue
-		}
-		x.set(name, attribute)
-	}
-	if entry.IsFile() || entry.IsDir() {
-		if err := entry.restoreLateFileFlags(x.f); err != nil {
-			LOG_DEBUG("ATTR_RESTORE", "Could not restore flags for file %s: %v", fullPath, err)
-		}
-	}
-	x.f.Close()
-}
-
-func (entry *Entry) readFileFlags(f *os.File) error {
+func (entry *Entry) ReadFileFlags(f *os.File) error {
 	var flags uint32
 	if err := ioctl(f, linux_FS_IOC_GETFLAGS, &flags); err != nil {
 		return err
@@ -207,7 +94,7 @@ func (entry *Entry) RestoreEarlyFileFlags(f *os.File) error {
 	return nil
 }
 
-func (entry *Entry) restoreLateFileFlags(f *os.File) error {
+func (entry *Entry) RestoreLateFileFlags(f *os.File) error {
 	if entry.Attributes == nil {
 		return nil
 	}

src/duplicacy_utils_others.go

@@ -2,17 +2,18 @@
 // Free for personal use and commercial trial
 // Commercial use requires per-user licenses available from https://duplicacy.com
 
-//go:build !windows
 // +build !windows
 
 package duplicacy
 
 import (
+	"bytes"
 	"os"
 	"path"
+	"path/filepath"
 	"syscall"
 
-	"golang.org/x/sys/unix"
+	"github.com/pkg/xattr"
 )
 
 func Readlink(path string) (isRegular bool, s string, err error) {
@@ -46,50 +47,58 @@ func SetOwner(fullPath string, entry *Entry, fileInfo *os.FileInfo) bool {
 	return true
 }
 
-func (entry *Entry) ReadSpecial(fileInfo os.FileInfo) bool {
-	if fileInfo.Mode()&(os.ModeDevice|os.ModeCharDevice) == 0 {
-		return true
+func (entry *Entry) ReadAttributes(top string) {
+	fullPath := filepath.Join(top, entry.Path)
+	f, err := os.OpenFile(fullPath, os.O_RDONLY|syscall.O_NOFOLLOW, 0)
+	if err != nil {
+		return
 	}
-	stat := fileInfo.Sys().(*syscall.Stat_t)
-	if stat == nil {
-		return false
+	attributes, _ := xattr.FList(f)
+	if len(attributes) > 0 {
+		entry.Attributes = &map[string][]byte{}
+		for _, name := range attributes {
+			attribute, err := xattr.Get(fullPath, name)
+			if err == nil {
+				(*entry.Attributes)[name] = attribute
+			}
+		}
 	}
-	entry.Size = 0
-	rdev := uint64(stat.Rdev)
-	entry.StartChunk = int(rdev & 0xFFFFFFFF)
-	entry.StartOffset = int(rdev >> 32)
-	return true
+	if err := entry.ReadFileFlags(f); err != nil {
+		LOG_INFO("ATTR_BACKUP", "Could not backup flags for file %s: %v", fullPath, err)
+	}
+	f.Close()
 }
 
-func (entry *Entry) GetRdev() uint64 {
-	return uint64(entry.StartChunk) | uint64(entry.StartOffset)<<32
-}
-
-func (entry *Entry) RestoreSpecial(fullPath string) error {
-	mode := entry.Mode & uint32(fileModeMask)
-
-	if entry.Mode&uint32(os.ModeNamedPipe) != 0 {
-		mode |= syscall.S_IFIFO
-	} else if entry.Mode&uint32(os.ModeCharDevice) != 0 {
-		mode |= syscall.S_IFCHR
-	} else if entry.Mode&uint32(os.ModeDevice) != 0 {
-		mode |= syscall.S_IFBLK
-	} else {
-		return nil
+func (entry *Entry) SetAttributesToFile(fullPath string) {
+	f, err := os.OpenFile(fullPath, os.O_RDONLY|syscall.O_NOFOLLOW, 0)
+	if err != nil {
+		return
 	}
-	return syscall.Mknod(fullPath, mode, int(entry.GetRdev()))
-}
 
-func (entry *Entry) IsSameSpecial(fileInfo os.FileInfo) bool {
-	stat := fileInfo.Sys().(*syscall.Stat_t)
-	if stat == nil {
-		return false
+	names, _ := xattr.FList(f)
+	for _, name := range names {
+		newAttribute, found := (*entry.Attributes)[name]
+		if found {
+			oldAttribute, _ := xattr.FGet(f, name)
+			if !bytes.Equal(oldAttribute, newAttribute) {
+				xattr.FSet(f, name, newAttribute)
+			}
+			delete(*entry.Attributes, name)
+		} else {
+			xattr.FRemove(f, name)
+		}
 	}
-	return (uint32(fileInfo.Mode()) == entry.Mode) && (uint64(stat.Rdev) == entry.GetRdev())
-}
 
-func MakeHardlink(source string, target string) error {
-	return unix.Linkat(unix.AT_FDCWD, source, unix.AT_FDCWD, target, 0)
+	for name, attribute := range *entry.Attributes {
+		if len(name) > 0 && name[0] == '\x00' {
+			continue
+		}
+		xattr.FSet(f, name, attribute)
+	}
+	if err := entry.RestoreLateFileFlags(f); err != nil {
+		LOG_DEBUG("ATTR_RESTORE", "Could not restore flags for file %s: %v", fullPath, err)
+	}
+	f.Close()
 }
 
 func joinPath(components ...string) string {

src/duplicacy_utils_windows.go

@@ -117,18 +117,6 @@ func (entry *Entry) SetAttributesToFile(fullPath string) {
 
 }
 
-func (entry *Entry) ReadDeviceNode(fileInfo os.FileInfo) bool {
-	return nil
-}
-
-func (entry *Entry) RestoreSpecial(fullPath string) error {
-	return nil
-}
-
-func MakeHardlink(source string, target string) error {
-	return os.Link(source, target)
-}
-
 func joinPath(components ...string) string {
 
 	combinedPath := `\\?\` + filepath.Join(components...)

src/duplicacy_utils_xbsd.go

@@ -1,30 +0,0 @@
-// Copyright (c) Acrosync LLC. All rights reserved.
-// Free for personal use and commercial trial
-// Commercial use requires per-user licenses available from https://duplicacy.com
-
-//go:build freebsd || netbsd
-// +build freebsd netbsd
-
-package duplicacy
-
-import (
-	"bytes"
-	"encoding/binary"
-	"os"
-	"path/filepath"
-	"syscall"
-
-	"github.com/pkg/xattr"
-)
-
-func (entry *Entry) restoreLateFileFlags(path string) error {
-	if entry.Attributes == nil {
-		return nil
-	}
-	if v, have := (*entry.Attributes)[bsdFileFlagsKey]; have {
-		if _, _, errno := syscall.Syscall(syscall.SYS_LCHFLAGS, uintptr(unsafe.Pointer(syscall.StringBytePtr(path))), uintptr(v), 0); errno != 0 {
-			return os.NewSyscallError("lchflags", errno)
-		}
-	}
-	return nil
-}