fuse: Add tags dir

src/restic/fuse/root.go

@@ -32,6 +32,7 @@ type Root struct {
 
 	dirSnapshots *SnapshotsDir
 	dirHosts     *HostsDir
+	dirTags      *TagsDir
 }
 
 // ensure that *Root implements these interfaces
@@ -54,6 +55,7 @@ func NewRoot(ctx context.Context, repo restic.Repository, cfg Config) (*Root, er
 
 	root.dirSnapshots = NewSnapshotsDir(root, fs.GenerateDynamicInode(root.inode, "snapshots"), snapshots)
 	root.dirHosts = NewHostsDir(root, fs.GenerateDynamicInode(root.inode, "hosts"), snapshots)
+	root.dirTags = NewTagsDir(root, fs.GenerateDynamicInode(root.inode, "tags"), snapshots)
 	root.blobSizeCache = NewBlobSizeCache(ctx, repo.Index())
 
 	return root, nil
@@ -98,10 +100,15 @@ func (r *Root) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 			Type:  fuse.DT_Dir,
 		},
 		{
-			Inode: fs.GenerateDynamicInode(0, "hosts"),
+			Inode: fs.GenerateDynamicInode(r.inode, "hosts"),
 			Name:  "hosts",
 			Type:  fuse.DT_Dir,
 		},
+		{
+			Inode: fs.GenerateDynamicInode(r.inode, "tags"),
+			Name:  "tags",
+			Type:  fuse.DT_Dir,
+		},
 	}
 
 	return items, nil
@@ -115,6 +122,8 @@ func (r *Root) Lookup(ctx context.Context, name string) (fs.Node, error) {
 		return r.dirSnapshots, nil
 	case "hosts":
 		return r.dirHosts, nil
+	case "tags":
+		return r.dirTags, nil
 	}
 
 	return nil, fuse.ENOENT

src/restic/fuse/tags_dir.go

@@ -0,0 +1,101 @@
+// +build !openbsd
+// +build !windows
+
+package fuse
+
+import (
+	"os"
+	"restic"
+	"restic/debug"
+
+	"golang.org/x/net/context"
+
+	"bazil.org/fuse"
+	"bazil.org/fuse/fs"
+)
+
+// TagsDir is a fuse directory which contains hostnames.
+type TagsDir struct {
+	inode     uint64
+	root      *Root
+	snapshots restic.Snapshots
+	tags      map[string]*SnapshotsDir
+}
+
+// NewTagsDir returns a new directory containing tags, which in turn contains
+// snapshots with this tag set.
+func NewTagsDir(root *Root, inode uint64, snapshots restic.Snapshots) *TagsDir {
+	tags := make(map[string]restic.Snapshots)
+	for _, sn := range snapshots {
+		for _, tag := range sn.Tags {
+			tags[tag] = append(tags[tag], sn)
+		}
+	}
+
+	debug.Log("create tags dir with %d snapshots, inode %d", len(tags), inode)
+
+	d := &TagsDir{
+		root:      root,
+		inode:     inode,
+		snapshots: snapshots,
+		tags:      make(map[string]*SnapshotsDir),
+	}
+
+	for name, snapshots := range tags {
+		debug.Log("  tag %v has %v snapshots", name, len(snapshots))
+		d.tags[name] = NewSnapshotsDir(root, fs.GenerateDynamicInode(inode, name), snapshots)
+	}
+
+	return d
+}
+
+// Attr returns the attributes for the root node.
+func (d *TagsDir) Attr(ctx context.Context, attr *fuse.Attr) error {
+	attr.Inode = d.inode
+	attr.Mode = os.ModeDir | 0555
+
+	if !d.root.cfg.OwnerIsRoot {
+		attr.Uid = uint32(os.Getuid())
+		attr.Gid = uint32(os.Getgid())
+	}
+	debug.Log("attr: %v", attr)
+	return nil
+}
+
+// ReadDirAll returns all entries of the root node.
+func (d *TagsDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
+	debug.Log("ReadDirAll()")
+	items := []fuse.Dirent{
+		{
+			Inode: d.inode,
+			Name:  ".",
+			Type:  fuse.DT_Dir,
+		},
+		{
+			Inode: d.root.inode,
+			Name:  "..",
+			Type:  fuse.DT_Dir,
+		},
+	}
+
+	for name := range d.tags {
+		items = append(items, fuse.Dirent{
+			Inode: fs.GenerateDynamicInode(d.inode, name),
+			Name:  name,
+			Type:  fuse.DT_Dir,
+		})
+	}
+
+	return items, nil
+}
+
+// Lookup returns a specific entry from the root node.
+func (d *TagsDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
+	debug.Log("Lookup(%s)", name)
+
+	if dir, ok := d.tags[name]; ok {
+		return dir, nil
+	}
+
+	return nil, fuse.ENOENT
+}