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restic/node.go
2015-04-24 19:39:32 -04:00

343 lines
7.5 KiB
Go

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("<Node(%s) %s>", 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
}