mirror of
https://github.com/restic/restic.git
synced 2024-12-22 15:57:07 +00:00
333 lines
7.4 KiB
Go
333 lines
7.4 KiB
Go
package restic
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import (
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"encoding/json"
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"fmt"
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"os"
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"strconv"
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"syscall"
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"time"
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"github.com/juju/arrar"
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"github.com/restic/restic/backend"
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)
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type Node struct {
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Name string `json:"name"`
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Type string `json:"type"`
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Mode os.FileMode `json:"mode,omitempty"`
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ModTime time.Time `json:"mtime,omitempty"`
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AccessTime time.Time `json:"atime,omitempty"`
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ChangeTime time.Time `json:"ctime,omitempty"`
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UID uint32 `json:"uid"`
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GID uint32 `json:"gid"`
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User string `json:"user,omitempty"`
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Group string `json:"group,omitempty"`
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Inode uint64 `json:"inode,omitempty"`
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Size uint64 `json:"size,omitempty"`
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Links uint64 `json:"links,omitempty"`
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LinkTarget string `json:"linktarget,omitempty"`
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Device uint64 `json:"device,omitempty"`
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Content []backend.ID `json:"content"`
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Subtree backend.ID `json:"subtree,omitempty"`
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Error string `json:"error,omitempty"`
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tree *Tree
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path string
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err error
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}
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func (n Node) String() string {
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switch n.Type {
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case "file":
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return fmt.Sprintf("%s %5d %5d %6d %s %s",
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n.Mode, n.UID, n.GID, n.Size, n.ModTime, n.Name)
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case "dir":
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return fmt.Sprintf("%s %5d %5d %6d %s %s",
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n.Mode|os.ModeDir, n.UID, n.GID, n.Size, n.ModTime, n.Name)
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}
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return fmt.Sprintf("<Node(%s) %s>", n.Type, n.Name)
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}
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func (node Node) Tree() *Tree {
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return node.tree
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}
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func NodeFromFileInfo(path string, fi os.FileInfo) (*Node, error) {
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node := GetNode()
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node.path = path
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node.Name = fi.Name()
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node.Mode = fi.Mode() & os.ModePerm
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node.ModTime = fi.ModTime()
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switch fi.Mode() & (os.ModeType | os.ModeCharDevice) {
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case 0:
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node.Type = "file"
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node.Size = uint64(fi.Size())
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case os.ModeDir:
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node.Type = "dir"
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case os.ModeSymlink:
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node.Type = "symlink"
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case os.ModeDevice | os.ModeCharDevice:
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node.Type = "chardev"
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case os.ModeDevice:
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node.Type = "dev"
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case os.ModeNamedPipe:
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node.Type = "fifo"
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case os.ModeSocket:
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node.Type = "socket"
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}
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err := node.fill_extra(path, fi)
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return node, err
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}
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func CreateNodeAt(node *Node, m *Map, s Server, path string) error {
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switch node.Type {
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case "dir":
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err := os.Mkdir(path, node.Mode)
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if err != nil {
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return arrar.Annotate(err, "Mkdir")
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}
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err = os.Lchown(path, int(node.UID), int(node.GID))
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if err != nil {
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return arrar.Annotate(err, "Lchown")
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}
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var utimes = []syscall.Timespec{
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syscall.NsecToTimespec(node.AccessTime.UnixNano()),
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syscall.NsecToTimespec(node.ModTime.UnixNano()),
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}
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err = syscall.UtimesNano(path, utimes)
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if err != nil {
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return arrar.Annotate(err, "Utimesnano")
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}
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case "file":
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// TODO: handle hard links
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f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0600)
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defer f.Close()
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if err != nil {
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return arrar.Annotate(err, "OpenFile")
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}
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for _, blobid := range node.Content {
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blob, err := m.FindID(blobid)
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if err != nil {
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return arrar.Annotate(err, "Find Blob")
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}
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buf, err := s.Load(backend.Data, blob)
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if err != nil {
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return arrar.Annotate(err, "Load")
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}
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_, err = f.Write(buf)
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if err != nil {
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return arrar.Annotate(err, "Write")
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}
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}
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f.Close()
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err = os.Lchown(path, int(node.UID), int(node.GID))
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if err != nil {
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return arrar.Annotate(err, "Lchown")
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}
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var utimes = []syscall.Timespec{
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syscall.NsecToTimespec(node.AccessTime.UnixNano()),
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syscall.NsecToTimespec(node.ModTime.UnixNano()),
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}
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err = syscall.UtimesNano(path, utimes)
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if err != nil {
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return arrar.Annotate(err, "Utimesnano")
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}
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case "symlink":
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err := os.Symlink(node.LinkTarget, path)
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if err != nil {
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return arrar.Annotate(err, "Symlink")
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}
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err = os.Lchown(path, int(node.UID), int(node.GID))
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if err != nil {
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return arrar.Annotate(err, "Lchown")
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}
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// f, err := os.OpenFile(path, O_PATH|syscall.O_NOFOLLOW, 0600)
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// defer f.Close()
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// if err != nil {
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// return arrar.Annotate(err, "OpenFile")
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// }
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// TODO: Get Futimes() working on older Linux kernels (fails with 3.2.0)
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// var utimes = []syscall.Timeval{
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// syscall.NsecToTimeval(node.AccessTime.UnixNano()),
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// syscall.NsecToTimeval(node.ModTime.UnixNano()),
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// }
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// err = syscall.Futimes(int(f.Fd()), utimes)
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// if err != nil {
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// return arrar.Annotate(err, "Futimes")
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// }
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return nil
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case "dev":
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err := node.createDevAt(path)
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if err != nil {
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return arrar.Annotate(err, "Mknod")
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}
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case "chardev":
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err := node.createCharDevAt(path)
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if err != nil {
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return arrar.Annotate(err, "Mknod")
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}
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case "fifo":
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err := node.createFifoAt(path)
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if err != nil {
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return arrar.Annotate(err, "Mkfifo")
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}
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case "socket":
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// nothing to do, we do not restore sockets
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return nil
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default:
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return fmt.Errorf("filetype %q not implemented!\n", node.Type)
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}
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err := os.Chmod(path, node.Mode)
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if err != nil {
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return arrar.Annotate(err, "Chmod")
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}
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err = os.Chown(path, int(node.UID), int(node.GID))
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if err != nil {
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return arrar.Annotate(err, "Chown")
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}
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err = os.Chtimes(path, node.AccessTime, node.ModTime)
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if err != nil {
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return arrar.Annotate(err, "Chtimes")
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}
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return nil
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}
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func (node Node) SameContent(olderNode *Node) bool {
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// if this node has a type other than "file", treat as if content has changed
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if node.Type != "file" {
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return false
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}
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// if the name or type has changed, this is surely something different
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if node.Name != olderNode.Name || node.Type != olderNode.Type {
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return false
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}
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// if timestamps or inodes differ, content has changed
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if node.ModTime != olderNode.ModTime ||
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node.ChangeTime != olderNode.ChangeTime ||
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node.Inode != olderNode.Inode {
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return false
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}
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// otherwise the node is assumed to have the same content
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return true
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}
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func (node Node) MarshalJSON() ([]byte, error) {
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type nodeJSON Node
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nj := nodeJSON(node)
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name := strconv.Quote(node.Name)
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nj.Name = name[1 : len(name)-1]
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return json.Marshal(nj)
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}
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func (node *Node) UnmarshalJSON(data []byte) error {
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type nodeJSON Node
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var nj *nodeJSON = (*nodeJSON)(node)
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err := json.Unmarshal(data, nj)
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if err != nil {
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return err
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}
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nj.Name, err = strconv.Unquote(`"` + nj.Name + `"`)
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return err
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}
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func (node Node) Equals(other Node) bool {
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// TODO: add generatored code for this
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if node.Name != other.Name {
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return false
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}
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if node.Type != other.Type {
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return false
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}
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if node.Mode != other.Mode {
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return false
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}
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if node.ModTime != other.ModTime {
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return false
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}
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if node.AccessTime != other.AccessTime {
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return false
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}
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if node.ChangeTime != other.ChangeTime {
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return false
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}
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if node.UID != other.UID {
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return false
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}
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if node.GID != other.GID {
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return false
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}
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if node.User != other.User {
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return false
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}
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if node.Group != other.Group {
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return false
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}
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if node.Inode != other.Inode {
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return false
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}
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if node.Size != other.Size {
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return false
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}
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if node.Links != other.Links {
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return false
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}
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if node.LinkTarget != other.LinkTarget {
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return false
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}
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if node.Device != other.Device {
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return false
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}
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if node.Content != nil && other.Content == nil {
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return false
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} else if node.Content == nil && other.Content != nil {
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return false
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} else if node.Content != nil && other.Content != nil {
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if len(node.Content) != len(other.Content) {
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return false
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}
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for i := 0; i < len(node.Content); i++ {
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if !node.Content[i].Equal(other.Content[i]) {
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return false
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}
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}
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}
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if !node.Subtree.Equal(other.Subtree) {
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return false
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}
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if node.Error != other.Error {
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return false
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}
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return true
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}
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