mirror of
https://github.com/restic/restic.git
synced 2024-12-23 16:26:11 +00:00
116 lines
2.9 KiB
Go
116 lines
2.9 KiB
Go
package restic
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import (
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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/restic/restic/backend"
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"github.com/restic/restic/repository"
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"github.com/juju/errors"
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)
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// Restorer is used to restore a snapshot to a directory.
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type Restorer struct {
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repo *repository.Repository
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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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var restorerAbortOnAllErrors = func(str string, node *Node, err error) error { return err }
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// NewRestorer creates a restorer preloaded with the content from the snapshot id.
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func NewRestorer(repo *repository.Repository, id backend.ID) (*Restorer, error) {
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r := &Restorer{repo: repo, Error: restorerAbortOnAllErrors}
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var err error
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r.sn, err = LoadSnapshot(repo, id)
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if err != nil {
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return nil, errors.Annotate(err, "load snapshot for restorer")
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}
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return r, nil
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}
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func (res *Restorer) restoreTo(dst string, dir string, treeID backend.ID) error {
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tree, err := LoadTree(res.repo, treeID)
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if err != nil {
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return res.Error(dir, nil, errors.Annotate(err, "LoadTree"))
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}
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for _, node := range tree.Nodes {
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if err := res.restoreNodeTo(node, dir, dst); err != nil {
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return err
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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 fmt.Errorf("Dir without subtree in tree %v", treeID.Str())
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}
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subp := filepath.Join(dir, node.Name)
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err = res.restoreTo(dst, subp, node.Subtree)
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if err != nil {
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err = res.Error(subp, node, errors.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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// Restore directory timestamp at the end. If we would do it earlier, restoring files within
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// the directory would overwrite the timestamp of the directory they are in.
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if err := node.RestoreTimestamps(filepath.Join(dst, dir, node.Name)); err != nil {
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return err
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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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func (res *Restorer) restoreNodeTo(node *Node, dir string, dst string) error {
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dstPath := filepath.Join(dst, dir, node.Name)
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if res.Filter != nil && res.Filter(filepath.Join(dir, node.Name), dstPath, node) {
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return nil
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}
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err := node.CreateAt(dstPath, res.repo)
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// Did it fail because of ENOENT?
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if pe, ok := errors.Cause(err).(*os.PathError); ok {
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errn, ok := pe.Err.(syscall.Errno)
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if ok && errn == syscall.ENOENT {
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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(dstPath, res.repo)
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}
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}
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}
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if err != nil {
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err = res.Error(dstPath, node, errors.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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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.restoreTo(dir, "", res.sn.Tree)
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}
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// Snapshot returns the snapshot this restorer is configured to use.
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func (res *Restorer) Snapshot() *Snapshot {
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return res.sn
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}
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