package restic import ( "encoding/json" "fmt" "os" "strconv" "syscall" "time" "github.com/juju/arrar" "github.com/restic/restic/backend" ) type Node struct { Name string `json:"name"` Type string `json:"type"` Mode os.FileMode `json:"mode,omitempty"` ModTime time.Time `json:"mtime,omitempty"` AccessTime time.Time `json:"atime,omitempty"` ChangeTime time.Time `json:"ctime,omitempty"` UID uint32 `json:"uid"` GID uint32 `json:"gid"` User string `json:"user,omitempty"` Group string `json:"group,omitempty"` Inode uint64 `json:"inode,omitempty"` Size uint64 `json:"size,omitempty"` Links uint64 `json:"links,omitempty"` LinkTarget string `json:"linktarget,omitempty"` Device uint64 `json:"device,omitempty"` Content []backend.ID `json:"content"` Subtree backend.ID `json:"subtree,omitempty"` Error string `json:"error,omitempty"` tree *Tree path string err error blobs Blobs } func (n Node) String() string { switch n.Type { case "file": return fmt.Sprintf("%s %5d %5d %6d %s %s", n.Mode, n.UID, n.GID, n.Size, n.ModTime, n.Name) case "dir": return fmt.Sprintf("%s %5d %5d %6d %s %s", n.Mode|os.ModeDir, n.UID, n.GID, n.Size, n.ModTime, n.Name) } return fmt.Sprintf("", n.Type, n.Name) } func (node Node) Tree() *Tree { return node.tree } func NodeFromFileInfo(path string, fi os.FileInfo) (*Node, error) { node := &Node{ path: path, Name: fi.Name(), Mode: fi.Mode() & (os.ModePerm | os.ModeType), ModTime: fi.ModTime(), } node.Type = nodeTypeFromFileInfo(path, fi) if node.Type == "file" { node.Size = uint64(fi.Size()) } err := node.fillExtra(path, fi) return node, err } func nodeTypeFromFileInfo(path string, fi os.FileInfo) string { switch fi.Mode() & (os.ModeType | os.ModeCharDevice) { case 0: return "file" case os.ModeDir: return "dir" case os.ModeSymlink: return "symlink" case os.ModeDevice | os.ModeCharDevice: return "chardev" case os.ModeDevice: return "dev" case os.ModeNamedPipe: return "fifo" case os.ModeSocket: return "socket" } return "" } func CreateNodeAt(node *Node, m *Map, s Server, path string) error { switch node.Type { case "dir": err := os.Mkdir(path, node.Mode) if err != nil { return arrar.Annotate(err, "Mkdir") } err = os.Lchown(path, int(node.UID), int(node.GID)) if err != nil { return arrar.Annotate(err, "Lchown") } var utimes = []syscall.Timespec{ syscall.NsecToTimespec(node.AccessTime.UnixNano()), syscall.NsecToTimespec(node.ModTime.UnixNano()), } err = syscall.UtimesNano(path, utimes) if err != nil { return arrar.Annotate(err, "Utimesnano") } case "file": // TODO: handle hard links f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0600) defer f.Close() if err != nil { return arrar.Annotate(err, "OpenFile") } for _, blobid := range node.Content { blob, err := m.FindID(blobid) if err != nil { return arrar.Annotate(err, "Find Blob") } buf, err := s.Load(backend.Data, blob) if err != nil { return arrar.Annotate(err, "Load") } _, err = f.Write(buf) if err != nil { return arrar.Annotate(err, "Write") } } f.Close() err = os.Lchown(path, int(node.UID), int(node.GID)) if err != nil { return arrar.Annotate(err, "Lchown") } var utimes = []syscall.Timespec{ syscall.NsecToTimespec(node.AccessTime.UnixNano()), syscall.NsecToTimespec(node.ModTime.UnixNano()), } err = syscall.UtimesNano(path, utimes) if err != nil { return arrar.Annotate(err, "Utimesnano") } case "symlink": err := os.Symlink(node.LinkTarget, path) if err != nil { return arrar.Annotate(err, "Symlink") } err = os.Lchown(path, int(node.UID), int(node.GID)) if err != nil { return arrar.Annotate(err, "Lchown") } // f, err := os.OpenFile(path, O_PATH|syscall.O_NOFOLLOW, 0600) // defer f.Close() // if err != nil { // return arrar.Annotate(err, "OpenFile") // } // TODO: Get Futimes() working on older Linux kernels (fails with 3.2.0) // var utimes = []syscall.Timeval{ // syscall.NsecToTimeval(node.AccessTime.UnixNano()), // syscall.NsecToTimeval(node.ModTime.UnixNano()), // } // err = syscall.Futimes(int(f.Fd()), utimes) // if err != nil { // return arrar.Annotate(err, "Futimes") // } return nil case "dev": err := node.createDevAt(path) if err != nil { return arrar.Annotate(err, "Mknod") } case "chardev": err := node.createCharDevAt(path) if err != nil { return arrar.Annotate(err, "Mknod") } case "fifo": err := node.createFifoAt(path) if err != nil { return arrar.Annotate(err, "Mkfifo") } case "socket": // nothing to do, we do not restore sockets return nil default: return fmt.Errorf("filetype %q not implemented!\n", node.Type) } err := os.Chmod(path, node.Mode) if err != nil { return arrar.Annotate(err, "Chmod") } err = os.Chown(path, int(node.UID), int(node.GID)) if err != nil { return arrar.Annotate(err, "Chown") } err = os.Chtimes(path, node.AccessTime, node.ModTime) if err != nil { return arrar.Annotate(err, "Chtimes") } return nil } func (node Node) SameContent(olderNode *Node) bool { // if this node has a type other than "file", treat as if content has changed if node.Type != "file" { return false } // if the name or type has changed, this is surely something different if node.Name != olderNode.Name || node.Type != olderNode.Type { return false } // if timestamps or inodes differ, content has changed if node.ModTime != olderNode.ModTime || node.ChangeTime != olderNode.ChangeTime || node.Inode != olderNode.Inode { return false } // otherwise the node is assumed to have the same content return true } func (node Node) MarshalJSON() ([]byte, error) { type nodeJSON Node nj := nodeJSON(node) name := strconv.Quote(node.Name) nj.Name = name[1 : len(name)-1] return json.Marshal(nj) } func (node *Node) UnmarshalJSON(data []byte) error { type nodeJSON Node var nj *nodeJSON = (*nodeJSON)(node) err := json.Unmarshal(data, nj) if err != nil { return err } nj.Name, err = strconv.Unquote(`"` + nj.Name + `"`) return err } func (node Node) Equals(other Node) bool { // TODO: add generatored code for this if node.Name != other.Name { return false } if node.Type != other.Type { return false } if node.Mode != other.Mode { return false } if node.ModTime != other.ModTime { return false } if node.AccessTime != other.AccessTime { return false } if node.ChangeTime != other.ChangeTime { return false } if node.UID != other.UID { return false } if node.GID != other.GID { return false } if node.User != other.User { return false } if node.Group != other.Group { return false } if node.Inode != other.Inode { return false } if node.Size != other.Size { return false } if node.Links != other.Links { return false } if node.LinkTarget != other.LinkTarget { return false } if node.Device != other.Device { return false } if node.Content != nil && other.Content == nil { return false } else if node.Content == nil && other.Content != nil { return false } else if node.Content != nil && other.Content != nil { if len(node.Content) != len(other.Content) { return false } for i := 0; i < len(node.Content); i++ { if !node.Content[i].Equal(other.Content[i]) { return false } } } if !node.Subtree.Equal(other.Subtree) { return false } if node.Error != other.Error { return false } return true }