mirror of
https://github.com/octoleo/restic.git
synced 2024-12-22 10:58:55 +00:00
403 lines
8.9 KiB
Go
403 lines
8.9 KiB
Go
package restic
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import (
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"encoding/json"
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"errors"
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"fmt"
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"os"
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"os/user"
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"sort"
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"strconv"
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"strings"
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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 Tree []*Node
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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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Tree *Tree `json:"-"`
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path string
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}
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var (
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ErrNodeNotFound = errors.New("named node not found")
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ErrNodeAlreadyInTree = errors.New("node already present")
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)
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type Blob struct {
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ID backend.ID `json:"id,omitempty"`
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Size uint64 `json:"size,omitempty"`
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Storage backend.ID `json:"sid,omitempty"` // encrypted ID
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StorageSize uint64 `json:"ssize,omitempty"` // encrypted Size
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}
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type Blobs []Blob
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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 (t Tree) String() string {
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s := []string{}
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for _, n := range t {
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s = append(s, n.String())
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}
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return strings.Join(s, "\n")
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}
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func LoadTree(ch *ContentHandler, id backend.ID) (Tree, error) {
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if id == nil {
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return nil, nil
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}
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tree := Tree{}
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err := ch.LoadJSON(backend.Tree, id, &tree)
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if err != nil {
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return nil, err
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}
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return tree, nil
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}
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// PopulateFrom copies subtrees and content from other when it hasn't changed.
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func (t Tree) PopulateFrom(other Tree) error {
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for _, node := range t {
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// only copy entries for files
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if node.Type != "file" {
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continue
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}
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// find entry in other tree
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oldNode, err := other.Find(node.Name)
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// if the node could not be found, proceed to the next
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if err == ErrNodeNotFound {
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continue
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}
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// compare content
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if node.SameContent(oldNode) {
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// copy Content
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node.Content = oldNode.Content
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}
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}
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return nil
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}
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func (t *Tree) Insert(node *Node) error {
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pos, _, err := t.find(node.Name)
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if err == nil {
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// already present
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return ErrNodeAlreadyInTree
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}
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// insert blob
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// https://code.google.com/p/go-wiki/wiki/bliceTricks
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*t = append(*t, &Node{})
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copy((*t)[pos+1:], (*t)[pos:])
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(*t)[pos] = node
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return nil
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}
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func (t Tree) find(name string) (int, *Node, error) {
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pos := sort.Search(len(t), func(i int) bool {
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return t[i].Name >= name
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})
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if pos < len(t) && t[pos].Name == name {
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return pos, t[pos], nil
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}
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return pos, nil, ErrNodeNotFound
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}
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func (t Tree) Find(name string) (*Node, error) {
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_, node, err := t.find(name)
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return node, err
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}
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func (node *Node) fill_extra(path string, fi os.FileInfo) (err error) {
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stat, ok := fi.Sys().(*syscall.Stat_t)
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if !ok {
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return
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}
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node.ChangeTime = time.Unix(stat.Ctim.Unix())
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node.AccessTime = time.Unix(stat.Atim.Unix())
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node.UID = stat.Uid
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node.GID = stat.Gid
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// TODO: cache uid lookup
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if u, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
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node.User = u.Username
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}
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// TODO: implement getgrnam() or use https://github.com/kless/osutil
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// if g, nil := user.LookupId(strconv.Itoa(int(stat.Uid))); err == nil {
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// node.User = u.Username
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// }
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node.Inode = stat.Ino
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switch node.Type {
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case "file":
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node.Size = uint64(stat.Size)
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node.Links = stat.Nlink
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case "dir":
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// nothing to do
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case "symlink":
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node.LinkTarget, err = os.Readlink(path)
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case "dev":
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node.Device = stat.Rdev
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case "chardev":
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node.Device = stat.Rdev
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case "fifo":
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// nothing to do
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case "socket":
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// nothing to do
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default:
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panic(fmt.Sprintf("invalid node type %q", node.Type))
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}
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return err
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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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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 (node *Node) CreateAt(ch *ContentHandler, 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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buf, err := ch.Load(backend.Data, blobid)
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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 := syscall.Mknod(path, syscall.S_IFBLK|0600, int(node.Device))
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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 := syscall.Mknod(path, syscall.S_IFCHR|0600, int(node.Device))
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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 := syscall.Mkfifo(path, 0600)
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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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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 (b Blob) Free() {
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if b.ID != nil {
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b.ID.Free()
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}
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if b.Storage != nil {
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b.Storage.Free()
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}
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}
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