mirror of https://github.com/restic/restic.git
131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
package restic
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import (
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"context"
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"os"
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"path/filepath"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/fs"
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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
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sn *Snapshot
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Error func(dir string, node *Node, err error) error
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SelectFilter 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, id ID) (*Restorer, error) {
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r := &Restorer{
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repo: repo, Error: restorerAbortOnAllErrors,
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SelectFilter: func(string, string, *Node) bool { return true },
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}
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var err error
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r.sn, err = LoadSnapshot(context.TODO(), repo, id)
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if err != nil {
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return nil, err
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}
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return r, nil
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}
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func (res *Restorer) restoreTo(ctx context.Context, dst string, dir string, treeID ID, idx *HardlinkIndex) error {
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tree, err := res.repo.LoadTree(ctx, treeID)
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if err != nil {
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return res.Error(dir, nil, err)
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}
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for _, node := range tree.Nodes {
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selectedForRestore := res.SelectFilter(filepath.Join(dir, node.Name),
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filepath.Join(dst, dir, node.Name), node)
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debug.Log("SelectForRestore returned %v", selectedForRestore)
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if selectedForRestore {
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err := res.restoreNodeTo(ctx, node, dir, dst, idx)
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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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if node.Type == "dir" {
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if node.Subtree == nil {
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return errors.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(ctx, dst, subp, *node.Subtree, idx)
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if err != nil {
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err = res.Error(subp, node, err)
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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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if selectedForRestore {
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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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}
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return nil
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}
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func (res *Restorer) restoreNodeTo(ctx context.Context, node *Node, dir string, dst string, idx *HardlinkIndex) error {
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debug.Log("node %v, dir %v, dst %v", node.Name, dir, dst)
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dstPath := filepath.Join(dst, dir, node.Name)
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err := node.CreateAt(ctx, dstPath, res.repo, idx)
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if err != nil {
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debug.Log("node.CreateAt(%s) error %v", dstPath, err)
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}
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// Did it fail because of ENOENT?
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if err != nil && os.IsNotExist(errors.Cause(err)) {
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debug.Log("create intermediate paths")
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// Create parent directories and retry
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err = fs.MkdirAll(filepath.Dir(dstPath), 0700)
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if err == nil || os.IsExist(errors.Cause(err)) {
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err = node.CreateAt(ctx, dstPath, res.repo, idx)
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}
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}
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if err != nil {
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debug.Log("error %v", err)
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err = res.Error(dstPath, node, err)
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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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debug.Log("successfully restored %v", node.Name)
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return nil
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}
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// RestoreTo creates the directories and files in the snapshot below dst.
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// Before an item is created, res.Filter is called.
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func (res *Restorer) RestoreTo(ctx context.Context, dst string) error {
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idx := NewHardlinkIndex()
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return res.restoreTo(ctx, dst, string(filepath.Separator), *res.sn.Tree, idx)
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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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