restic/src/restic/fuse/dir.go

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// +build !openbsd
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// +build !windows
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package fuse
import (
"os"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"golang.org/x/net/context"
"restic"
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"restic/debug"
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)
// Statically ensure that *dir implement those interface
var _ = fs.HandleReadDirAller(&dir{})
var _ = fs.NodeStringLookuper(&dir{})
type dir struct {
repo restic.Repository
items map[string]*restic.Node
inode uint64
node *restic.Node
ownerIsRoot bool
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}
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func newDir(ctx context.Context, repo restic.Repository, node *restic.Node, ownerIsRoot bool) (*dir, error) {
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debug.Log("new dir for %v (%v)", node.Name, node.Subtree.Str())
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tree, err := repo.LoadTree(ctx, *node.Subtree)
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if err != nil {
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debug.Log(" error loading tree %v: %v", node.Subtree.Str(), err)
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return nil, err
}
items := make(map[string]*restic.Node)
for _, node := range tree.Nodes {
items[node.Name] = node
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}
return &dir{
repo: repo,
node: node,
items: items,
inode: node.Inode,
ownerIsRoot: ownerIsRoot,
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}, nil
}
// replaceSpecialNodes replaces nodes with name "." and "/" by their contents.
// Otherwise, the node is returned.
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func replaceSpecialNodes(ctx context.Context, repo restic.Repository, node *restic.Node) ([]*restic.Node, error) {
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if node.Type != "dir" || node.Subtree == nil {
return []*restic.Node{node}, nil
}
if node.Name != "." && node.Name != "/" {
return []*restic.Node{node}, nil
}
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tree, err := repo.LoadTree(ctx, *node.Subtree)
if err != nil {
return nil, err
}
return tree.Nodes, nil
}
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func newDirFromSnapshot(ctx context.Context, repo restic.Repository, snapshot SnapshotWithId, ownerIsRoot bool) (*dir, error) {
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debug.Log("new dir for snapshot %v (%v)", snapshot.ID.Str(), snapshot.Tree.Str())
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tree, err := repo.LoadTree(ctx, *snapshot.Tree)
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if err != nil {
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debug.Log(" loadTree(%v) failed: %v", snapshot.ID.Str(), err)
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return nil, err
}
items := make(map[string]*restic.Node)
for _, n := range tree.Nodes {
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nodes, err := replaceSpecialNodes(ctx, repo, n)
if err != nil {
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debug.Log(" replaceSpecialNodes(%v) failed: %v", n, err)
return nil, err
}
for _, node := range nodes {
items[node.Name] = node
}
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}
return &dir{
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repo: repo,
node: &restic.Node{
UID: uint32(os.Getuid()),
GID: uint32(os.Getgid()),
AccessTime: snapshot.Time,
ModTime: snapshot.Time,
ChangeTime: snapshot.Time,
Mode: os.ModeDir | 0555,
},
items: items,
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inode: inodeFromBackendID(snapshot.ID),
ownerIsRoot: ownerIsRoot,
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}, nil
}
func (d *dir) Attr(ctx context.Context, a *fuse.Attr) error {
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debug.Log("called")
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a.Inode = d.inode
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a.Mode = os.ModeDir | d.node.Mode
if !d.ownerIsRoot {
a.Uid = d.node.UID
a.Gid = d.node.GID
}
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a.Atime = d.node.AccessTime
a.Ctime = d.node.ChangeTime
a.Mtime = d.node.ModTime
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a.Nlink = d.calcNumberOfLinks()
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return nil
}
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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
}
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func (d *dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
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debug.Log("called")
ret := make([]fuse.Dirent, 0, len(d.items))
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for _, node := range d.items {
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var typ fuse.DirentType
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switch node.Type {
case "dir":
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typ = fuse.DT_Dir
case "file":
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typ = fuse.DT_File
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case "symlink":
typ = fuse.DT_Link
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}
ret = append(ret, fuse.Dirent{
Inode: node.Inode,
Type: typ,
Name: node.Name,
})
}
return ret, nil
}
func (d *dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
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debug.Log("Lookup(%v)", name)
node, ok := d.items[name]
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if !ok {
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debug.Log(" Lookup(%v) -> not found", name)
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return nil, fuse.ENOENT
}
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switch node.Type {
case "dir":
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return newDir(ctx, d.repo, node, d.ownerIsRoot)
case "file":
return newFile(d.repo, node, d.ownerIsRoot)
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case "symlink":
return newLink(d.repo, node, d.ownerIsRoot)
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default:
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debug.Log(" node %v has unknown type %v", name, node.Type)
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return nil, fuse.ENOENT
}
}
func (d *dir) Listxattr(ctx context.Context, req *fuse.ListxattrRequest, resp *fuse.ListxattrResponse) error {
debug.Log("Listxattr(%v, %v)", d.node.Name, req.Size)
for _, attr := range d.node.ExtendedAttributes {
resp.Append(attr.Name)
}
return nil
}
func (d *dir) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *fuse.GetxattrResponse) error {
debug.Log("Getxattr(%v, %v, %v)", d.node.Name, req.Name, req.Size)
attrval := d.node.GetExtendedAttribute(req.Name)
if attrval != nil {
resp.Xattr = attrval
return nil
}
return fuse.ErrNoXattr
}