forked from TrueCloudLab/restic
bd43e27deb
When restoring an item fails with ENOENT, create parent directories and try again. This is needed for restoring partial trees (as in: the Filter function didn't return true for the paths leading up to this restore item).
108 lines
2.5 KiB
Go
108 lines
2.5 KiB
Go
package restic
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import (
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"errors"
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"fmt"
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"os"
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"path/filepath"
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"syscall"
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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 Restorer struct {
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s Server
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ch *ContentHandler
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sn *Snapshot
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Error func(dir string, node *Node, err error) error
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Filter func(item string, dstpath string, node *Node) bool
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}
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// NewRestorer creates a restorer preloaded with the content from the snapshot snid.
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func NewRestorer(s Server, snid backend.ID) (*Restorer, error) {
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r := &Restorer{s: s}
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var err error
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r.ch, err = NewContentHandler(s)
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if err != nil {
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return nil, arrar.Annotate(err, "create contenthandler for restorer")
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}
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r.sn, err = r.ch.LoadSnapshot(snid)
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if err != nil {
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return nil, arrar.Annotate(err, "load snapshot for restorer")
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}
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// abort on all errors
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r.Error = func(string, *Node, error) error { return err }
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return r, nil
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}
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func (res *Restorer) to(dst string, dir string, tree_id backend.ID) error {
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tree := Tree{}
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err := res.ch.LoadJSON(backend.Tree, tree_id, &tree)
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if err != nil {
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return res.Error(dir, nil, arrar.Annotate(err, "LoadJSON"))
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}
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for _, node := range tree {
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dstpath := filepath.Join(dst, dir, node.Name)
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if res.Filter == nil ||
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res.Filter(filepath.Join(res.sn.Dir, dir, node.Name), dstpath, node) {
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err := node.CreateAt(res.ch, dstpath)
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// Did it fail because of ENOENT?
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if arrar.Check(err, func(err error) bool {
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if pe, ok := err.(*os.PathError); ok {
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errn, ok := pe.Err.(syscall.Errno)
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return ok && errn == syscall.ENOENT
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}
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return false
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}) {
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// Create parent directories and retry
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err = os.MkdirAll(filepath.Dir(dstpath), 0700)
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if err == nil || err == os.ErrExist {
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err = node.CreateAt(res.ch, dstpath)
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}
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}
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if err != nil {
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err = res.Error(dstpath, node, arrar.Annotate(err, "create node"))
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if err != nil {
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return err
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}
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}
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}
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if node.Type == "dir" {
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if node.Subtree == nil {
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return errors.New(fmt.Sprintf("Dir without subtree in tree %s", tree_id))
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}
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subp := filepath.Join(dir, node.Name)
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err = res.to(dst, subp, node.Subtree)
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if err != nil {
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err = res.Error(subp, node, arrar.Annotate(err, "restore subtree"))
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if err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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// RestoreTo creates the directories and files in the snapshot below dir.
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// Before an item is created, res.Filter is called.
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func (res *Restorer) RestoreTo(dir string) error {
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return res.to(dir, "", res.sn.Tree)
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}
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func (res *Restorer) Snapshot() *Snapshot {
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return res.sn
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}
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