Merge pull request #800 from restic/jgfrm-hardlinks-fuse

fuse: correct nlink count for directories

doc/Manual.md

@@ -426,6 +426,11 @@ Don't forget to umount after quitting!
 
 Mounting repositories via FUSE is not possible on Windows and OpenBSD.
 
+Restic supports storage and preservation of hard links. However, since hard links
+exist in the scope of a filesystem by definition, restoring hard links from a fuse
+mount should be done by a program that preserves hard links. A program that does so
+is rsync, used with the option --hard-links.
+
 # Create an SFTP repository
 
 In order to backup data via SFTP, you must first set up a server with SSH and

src/restic/fuse/dir.go

@@ -114,9 +114,25 @@ func (d *dir) Attr(ctx context.Context, a *fuse.Attr) error {
 	a.Atime = d.node.AccessTime
 	a.Ctime = d.node.ChangeTime
 	a.Mtime = d.node.ModTime
+
+	a.Nlink = d.calcNumberOfLinks()
+
 	return nil
 }
 
+func (d *dir) calcNumberOfLinks() uint32 {
+	// a directory d has 2 hardlinks + the number
+	// of directories contained by d
+	var count uint32
+	count = 2
+	for _, node := range d.items {
+		if node.Type == "dir" {
+			count++
+		}
+	}
+	return count
+}
+
 func (d *dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 	debug.Log("called")
 	ret := make([]fuse.Dirent, 0, len(d.items))

src/restic/fuse/file.go

@@ -83,7 +83,9 @@ func (f *file) Attr(ctx context.Context, a *fuse.Attr) error {
 	a.Atime = f.node.AccessTime
 	a.Ctime = f.node.ChangeTime
 	a.Mtime = f.node.ModTime
+
 	return nil
+
 }
 
 func (f *file) getBlobAt(i int) (blob []byte, err error) {

src/restic/fuse/link.go

@@ -38,5 +38,8 @@ func (l *link) Attr(ctx context.Context, a *fuse.Attr) error {
 	a.Atime = l.node.AccessTime
 	a.Ctime = l.node.ChangeTime
 	a.Mtime = l.node.ModTime
+
+	a.Nlink = uint32(l.node.Links)
+
 	return nil
 }