Add exclude_by_attribute preference

duplicacy/duplicacy_main.go

@@ -536,6 +536,11 @@ func setPreference(context *cli.Context) {
 	
 	newPreference.NobackupFile = context.String("nobackup-file")
 
+	triBool = context.Generic("exclude-by-attribute").(*TriBool)
+	if triBool.IsSet() {
+		newPreference.ExcludeByAttribute = triBool.IsTrue()
+	}
+
 	key := context.String("key")
 	value := context.String("value")
 
@@ -717,7 +722,7 @@ func backupRepository(context *cli.Context) {
 	uploadRateLimit := context.Int("limit-rate")
 	enumOnly := context.Bool("enum-only")
 	storage.SetRateLimits(0, uploadRateLimit)
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -806,7 +811,7 @@ func restoreRepository(context *cli.Context) {
 	duplicacy.LOG_DEBUG("REGEX_DEBUG", "There are %d compiled regular expressions stored", len(duplicacy.RegexMap))
 
 	storage.SetRateLimits(context.Int("limit-rate"), 0)
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -846,7 +851,7 @@ func listSnapshots(context *cli.Context) {
 	tag := context.String("t")
 	revisions := getRevisions(context)
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	id := preference.SnapshotID
@@ -894,7 +899,7 @@ func checkSnapshots(context *cli.Context) {
 	tag := context.String("t")
 	revisions := getRevisions(context)
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	id := preference.SnapshotID
@@ -949,7 +954,7 @@ func printFile(context *cli.Context) {
 		snapshotID = context.String("id")
 	}
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -1005,11 +1010,11 @@ func diff(context *cli.Context) {
 	}
 
 	compareByHash := context.Bool("hash")
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
-	backupManager.SnapshotManager.Diff(repository, snapshotID, revisions, path, compareByHash, preference.NobackupFile)
+	backupManager.SnapshotManager.Diff(repository, snapshotID, revisions, path, compareByHash, preference.NobackupFile, preference.ExcludeByAttribute)
 
 	runScript(context, preference.Name, "post")
 }
@@ -1048,7 +1053,7 @@ func showHistory(context *cli.Context) {
 
 	revisions := getRevisions(context)
 	showLocalHash := context.Bool("hash")
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -1111,7 +1116,7 @@ func pruneSnapshots(context *cli.Context) {
 		os.Exit(ArgumentExitCode)
 	}
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile, preference.ExcludeByAttribute)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -1151,7 +1156,7 @@ func copySnapshots(context *cli.Context) {
 		sourcePassword = duplicacy.GetPassword(*source, "password", "Enter source storage password:", false, false)
 	}
 
-	sourceManager := duplicacy.CreateBackupManager(source.SnapshotID, sourceStorage, repository, sourcePassword, source.NobackupFile)
+	sourceManager := duplicacy.CreateBackupManager(source.SnapshotID, sourceStorage, repository, sourcePassword, source.NobackupFile, source.ExcludeByAttribute)
 	sourceManager.SetupSnapshotCache(source.Name)
 	duplicacy.SavePassword(*source, "password", sourcePassword)
 
@@ -1184,7 +1189,7 @@ func copySnapshots(context *cli.Context) {
 	destinationStorage.SetRateLimits(0, context.Int("upload-limit-rate"))
 
 	destinationManager := duplicacy.CreateBackupManager(destination.SnapshotID, destinationStorage, repository,
-		destinationPassword, destination.NobackupFile)
+		destinationPassword, destination.NobackupFile, destination.ExcludeByAttribute)
 	duplicacy.SavePassword(*destination, "password", destinationPassword)
 	destinationManager.SetupSnapshotCache(destination.Name)
 
@@ -1818,7 +1823,12 @@ func main() {
 					Name:  "nobackup-file",
 					Usage: "Directories containing a file with this name will not be backed up",
 					Argument: "<file name>",
-					Value:   "",
+				},
+				cli.GenericFlag{
+					Name:  "exclude-by-attribute",
+					Usage: "Exclude files based on file attributes. (macOS only, com_apple_backup_excludeItem)",
+					Value: &TriBool{},
+					Arg:   "true",
 				},
 				cli.StringFlag{
 					Name:  "key",

src/duplicacy_backupmanager.go

@@ -35,6 +35,8 @@ type BackupManager struct {
 	config *Config // contains a number of options
 	
 	nobackupFile string // don't backup directory when this file name is found
+
+	excludeByAttribute bool // don't backup file based on file attribute
 }
 
 func (manager *BackupManager) SetDryRun(dryRun bool) {
@@ -44,7 +46,7 @@ func (manager *BackupManager) SetDryRun(dryRun bool) {
 // CreateBackupManager creates a backup manager using the specified 'storage'.  'snapshotID' is a unique id to
 // identify snapshots created for this repository.  'top' is the top directory of the repository.  'password' is the
 // master key which can be nil if encryption is not enabled.
-func CreateBackupManager(snapshotID string, storage Storage, top string, password string, nobackupFile string) *BackupManager {
+func CreateBackupManager(snapshotID string, storage Storage, top string, password string, nobackupFile string, excludeByAttribute bool) *BackupManager {
 
 	config, _, err := DownloadConfig(storage, password)
 	if err != nil {
@@ -67,6 +69,8 @@ func CreateBackupManager(snapshotID string, storage Storage, top string, passwor
 		config: config,
 		
 		nobackupFile: nobackupFile,
+
+		excludeByAttribute: excludeByAttribute,
 	}
 
 	if IsDebugging() {
@@ -188,7 +192,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 	defer DeleteShadowCopy()
 
 	LOG_INFO("BACKUP_INDEXING", "Indexing %s", top)
-	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop, manager.nobackupFile)
+	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop, manager.nobackupFile, manager.excludeByAttribute)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 		return false
@@ -760,7 +764,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 	remoteSnapshot := manager.SnapshotManager.DownloadSnapshot(manager.snapshotID, revision)
 	manager.SnapshotManager.DownloadSnapshotContents(remoteSnapshot, patterns, true)
 
-	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top, manager.nobackupFile)
+	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top, manager.nobackupFile, manager.excludeByAttribute)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the repository: %v", err)
 		return false

src/duplicacy_backupmanager_test.go

@@ -239,7 +239,7 @@ func TestBackupManager(t *testing.T) {
 	time.Sleep(time.Duration(delay) * time.Second)
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")
-	backupManager := CreateBackupManager("host1", storage, testDir, password, "")
+	backupManager := CreateBackupManager("host1", storage, testDir, password, "", false)
 	backupManager.SetupSnapshotCache("default")
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")

src/duplicacy_entry.go

@@ -28,6 +28,29 @@ var fileModeMask = os.ModePerm | os.ModeSetuid | os.ModeSetgid | os.ModeSticky
 // Regex for matching 'StartChunk:StartOffset:EndChunk:EndOffset'
 var contentRegex = regexp.MustCompile(`^([0-9]+):([0-9]+):([0-9]+):([0-9]+)`)
 
+// AttributeExcludeName attribute name to determine file exclusion
+var AttributeExcludeName = getDefaultAttributeExcludeName()
+
+// AttributeExcludeValue attribute value to determine file exclusion
+var AttributeExcludeValue = getDefaultAttributeExcludeValue()
+
+func getDefaultAttributeExcludeName() string {
+	if runtime.GOOS == "darwin" {
+		return "com.apple.metadata:com_apple_backup_excludeItem"
+	}
+	if runtime.GOOS == "linux" {
+		return "duplicacy_exclude"
+	}
+	return ""
+}
+
+func getDefaultAttributeExcludeValue() string {
+	if runtime.GOOS == "darwin" {
+		return "com.apple.backupd"
+	}
+	return ""
+}
+
 // Entry encapsulates information about a file or directory.
 type Entry struct {
 	Path string
@@ -443,7 +466,7 @@ func (files FileInfoCompare) Less(i, j int) bool {
 
 // 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, fileList *[]*Entry, patterns []string, nobackupFile string, discardAttributes bool) (directoryList []*Entry,
+func ListEntries(top string, path string, fileList *[]*Entry, patterns []string, nobackupFile string, discardAttributes bool, excludeByAttribute bool) (directoryList []*Entry,
 	skippedFiles []string, err error) {
 
 	LOG_DEBUG("LIST_ENTRIES", "Listing %s", path)
@@ -521,6 +544,17 @@ func ListEntries(top string, path string, fileList *[]*Entry, patterns []string,
 			entry.ReadAttributes(top)
 		}
 
+		if excludeByAttribute && (runtime.GOOS == "darwin" || runtime.GOOS == "linux") {
+			attrValue, ok := entry.Attributes[AttributeExcludeName]
+			if ok {
+				attrValueString := string(attrValue)
+				if strings.Contains(attrValueString, AttributeExcludeValue) {
+					LOG_WARN("LIST_NOBACKUPXATTR", "%s is excluded due to extended attribute: %s", entry.Path, AttributeExcludeName)
+					continue
+				}
+			}
+		}
+
 		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)

src/duplicacy_entry_test.go

@@ -9,8 +9,12 @@ import (
 	"math/rand"
 	"os"
 	"path/filepath"
+	"runtime"
 	"sort"
+	"strings"
 	"testing"
+
+	"github.com/gilbertchen/xattr"
 )
 
 func TestEntrySort(t *testing.T) {
@@ -173,7 +177,7 @@ func TestEntryList(t *testing.T) {
 		directory := directories[len(directories)-1]
 		directories = directories[:len(directories)-1]
 		entries = append(entries, directory)
-		subdirectories, _, err := ListEntries(testDir, directory.Path, &entries, nil, "", false)
+		subdirectories, _, err := ListEntries(testDir, directory.Path, &entries, nil, "", false, false)
 		if err != nil {
 			t.Errorf("ListEntries(%s, %s) returned an error: %s", testDir, directory.Path, err)
 		}
@@ -216,3 +220,110 @@ func TestEntryList(t *testing.T) {
 	}
 
 }
+
+// TestEntryExcludeByAttribute tests the excludeByAttribute parameter to the ListEntries function
+func TestEntryExcludeByAttribute(t *testing.T) {
+
+	if !(runtime.GOOS == "darwin" || runtime.GOOS == "linux") {
+		t.Skip("skipping test not darwin or linux")
+	}
+
+	testDir := filepath.Join(os.TempDir(), "duplicacy_test")
+
+	os.RemoveAll(testDir)
+	os.MkdirAll(testDir, 0700)
+
+	// Files or folders named with "exclude" below will have the exclusion attribute set on them
+	// When ListEntries is called with excludeByAttribute true, they should be excluded.
+	DATA := [...]string{
+		"excludefile",
+		"includefile",
+		"excludedir/",
+		"excludedir/file",
+		"includedir/",
+		"includedir/includefile",
+		"includedir/excludefile",
+	}
+
+	for _, file := range DATA {
+		fullPath := filepath.Join(testDir, file)
+		if file[len(file)-1] == '/' {
+			err := os.Mkdir(fullPath, 0700)
+			if err != nil {
+				t.Errorf("Mkdir(%s) returned an error: %s", fullPath, err)
+			}
+			continue
+		}
+
+		err := ioutil.WriteFile(fullPath, []byte(file), 0700)
+		if err != nil {
+			t.Errorf("WriteFile(%s) returned an error: %s", fullPath, err)
+		}
+	}
+
+	for _, file := range DATA {
+		fullPath := filepath.Join(testDir, file)
+		if strings.Contains(file, "exclude") {
+			xattr.Setxattr(fullPath, AttributeExcludeName, []byte(AttributeExcludeValue))
+		}
+	}
+
+	for _, excludeByAttribute := range [2]bool{true, false} {
+		t.Logf("testing excludeByAttribute: %t", excludeByAttribute)
+		directories := make([]*Entry, 0, 4)
+		directories = append(directories, CreateEntry("", 0, 0, 0))
+
+		entries := make([]*Entry, 0, 4)
+
+		for len(directories) > 0 {
+			directory := directories[len(directories)-1]
+			directories = directories[:len(directories)-1]
+			entries = append(entries, directory)
+			subdirectories, _, err := ListEntries(testDir, directory.Path, &entries, nil, "", false, excludeByAttribute)
+			if err != nil {
+				t.Errorf("ListEntries(%s, %s) returned an error: %s", testDir, directory.Path, err)
+			}
+			directories = append(directories, subdirectories...)
+		}
+
+		entries = entries[1:]
+
+		for _, entry := range entries {
+			t.Logf("entry: %s", entry.Path)
+		}
+
+		i := 0
+		for _, file := range DATA {
+			entryFound := false
+			var entry *Entry
+			for _, entry = range entries {
+				if entry.Path == file {
+					entryFound = true
+					break
+				}
+			}
+
+			if excludeByAttribute && strings.Contains(file, "exclude") {
+				if entryFound {
+					t.Errorf("file: %s, expected to be excluded but wasn't. attributes: %v", file, entry.Attributes)
+					i++
+				} else {
+					t.Logf("file: %s, excluded", file)
+				}
+			} else {
+				if entryFound {
+					t.Logf("file: %s, included. attributes: %v", file, entry.Attributes)
+					i++
+				} else {
+					t.Errorf("file: %s, expected to be included but wasn't", file)
+				}
+			}
+		}
+
+	}
+
+	if !t.Failed() {
+		os.RemoveAll(testDir)
+	}
+
+}

src/duplicacy_preference.go

@@ -15,16 +15,17 @@ import (
 
 // Preference stores options for each storage.
 type Preference struct {
-	Name              string            `json:"name"`
-	SnapshotID        string            `json:"id"`
-	RepositoryPath    string            `json:"repository"`
-	StorageURL        string            `json:"storage"`
-	Encrypted         bool              `json:"encrypted"`
-	BackupProhibited  bool              `json:"no_backup"`
-	RestoreProhibited bool              `json:"no_restore"`
-	DoNotSavePassword bool              `json:"no_save_password"`
-	NobackupFile      string            `json:"nobackup_file"`
-	Keys              map[string]string `json:"keys"`
+	Name               string            `json:"name"`
+	SnapshotID         string            `json:"id"`
+	RepositoryPath     string            `json:"repository"`
+	StorageURL         string            `json:"storage"`
+	Encrypted          bool              `json:"encrypted"`
+	BackupProhibited   bool              `json:"no_backup"`
+	RestoreProhibited  bool              `json:"no_restore"`
+	DoNotSavePassword  bool              `json:"no_save_password"`
+	NobackupFile       string            `json:"nobackup_file"`
+	ExcludeByAttribute bool              `json:"exclude_by_attribute"`
+	Keys               map[string]string `json:"keys"`
 }
 
 var preferencePath string

src/duplicacy_snapshot.go

@@ -57,7 +57,7 @@ func CreateEmptySnapshot(id string) (snapshto *Snapshot) {
 
 // CreateSnapshotFromDirectory creates a snapshot from the local directory 'top'.  Only 'Files'
 // will be constructed, while 'ChunkHashes' and 'ChunkLengths' can only be populated after uploading.
-func CreateSnapshotFromDirectory(id string, top string, nobackupFile string) (snapshot *Snapshot, skippedDirectories []string,
+func CreateSnapshotFromDirectory(id string, top string, nobackupFile string, excludeByAttribute bool) (snapshot *Snapshot, skippedDirectories []string,
 	skippedFiles []string, err error) {
 
 	snapshot = &Snapshot{
@@ -125,7 +125,7 @@ func CreateSnapshotFromDirectory(id string, top string, nobackupFile string) (sn
 		directory := directories[len(directories)-1]
 		directories = directories[:len(directories)-1]
 		snapshot.Files = append(snapshot.Files, directory)
-		subdirectories, skipped, err := ListEntries(top, directory.Path, &snapshot.Files, patterns, nobackupFile, snapshot.discardAttributes)
+		subdirectories, skipped, err := ListEntries(top, directory.Path, &snapshot.Files, patterns, nobackupFile, snapshot.discardAttributes, excludeByAttribute)
 		if err != nil {
 			LOG_WARN("LIST_FAILURE", "Failed to list subdirectory: %v", err)
 			skippedDirectories = append(skippedDirectories, directory.Path)

src/duplicacy_snapshotmanager.go

@@ -1262,7 +1262,7 @@ func (manager *SnapshotManager) PrintFile(snapshotID string, revision int, path
 
 // Diff compares two snapshots, or two revision of a file if the file argument is given.
 func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []int,
-	filePath string, compareByHash bool, nobackupFile string) bool {
+	filePath string, compareByHash bool, nobackupFile string, excludeByAttribute bool) bool {
 
 	LOG_DEBUG("DIFF_PARAMETERS", "top: %s, id: %s, revision: %v, path: %s, compareByHash: %t",
 		top, snapshotID, revisions, filePath, compareByHash)
@@ -1275,7 +1275,7 @@ func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []
 	if len(revisions) <= 1 {
 		// Only scan the repository if filePath is not provided
 		if len(filePath) == 0 {
-			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top, nobackupFile)
+			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top, nobackupFile, excludeByAttribute)
 			if err != nil {
 				LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 				return false