mirror of
https://github.com/restic/restic.git
synced 2024-12-24 08:44:52 +00:00
26be094f28
Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>
174 lines
4.9 KiB
Go
174 lines
4.9 KiB
Go
package restorer
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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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"github.com/restic/restic/internal/restic"
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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 restic.Repository
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sn *restic.Snapshot
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Error func(dir string, node *restic.Node, err error) error
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SelectFilter func(item string, dstpath string, node *restic.Node) (selectedForRestore bool, childMayBeSelected bool)
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}
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var restorerAbortOnAllErrors = func(str string, node *restic.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 restic.Repository, id restic.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, *restic.Node) (bool, bool) { return true, true },
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}
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var err error
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r.sn, err = restic.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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// restoreTo restores a tree from the repo to a destination. target is the path in
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// the file system, location within the snapshot.
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func (res *Restorer) restoreTo(ctx context.Context, target, location string, treeID restic.ID, idx *restic.HardlinkIndex) error {
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debug.Log("%v %v %v", target, location, treeID)
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tree, err := res.repo.LoadTree(ctx, treeID)
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if err != nil {
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debug.Log("error loading tree %v: %v", treeID, err)
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return res.Error(location, nil, err)
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}
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for _, node := range tree.Nodes {
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// ensure that the node name does not contain anything that refers to a
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// top-level directory.
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nodeName := filepath.Base(filepath.Join(string(filepath.Separator), node.Name))
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if nodeName != node.Name {
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debug.Log("node %q has invalid name %q", node.Name, nodeName)
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err := res.Error(location, node, errors.New("node has invalid name"))
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if err != nil {
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return err
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}
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continue
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}
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nodeTarget := filepath.Join(target, nodeName)
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nodeLocation := filepath.Join(location, nodeName)
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if target == nodeTarget || !fs.HasPathPrefix(target, nodeTarget) {
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debug.Log("target: %v %v", target, nodeTarget)
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debug.Log("node %q has invalid target path %q", node.Name, nodeTarget)
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err := res.Error(nodeLocation, node, errors.New("node has invalid path"))
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if err != nil {
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return err
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}
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continue
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}
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// sockets cannot be restored
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if node.Type == "socket" {
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continue
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}
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selectedForRestore, childMayBeSelected := res.SelectFilter(nodeLocation, nodeTarget, node)
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debug.Log("SelectFilter returned %v %v", selectedForRestore, childMayBeSelected)
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if node.Type == "dir" && childMayBeSelected {
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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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err = res.restoreTo(ctx, nodeTarget, nodeLocation, *node.Subtree, idx)
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if err != nil {
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err = res.Error(nodeLocation, 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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}
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if selectedForRestore {
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err = res.restoreNodeTo(ctx, node, nodeTarget, nodeLocation, idx)
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if err != nil {
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err = res.Error(nodeLocation, node, errors.Wrap(err, "restoreNodeTo"))
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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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err = node.RestoreTimestamps(nodeTarget)
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if err != nil {
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err = res.Error(nodeLocation, node, errors.Wrap(err, "RestoreTimestamps"))
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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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func (res *Restorer) restoreNodeTo(ctx context.Context, node *restic.Node, target, location string, idx *restic.HardlinkIndex) error {
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debug.Log("%v %v %v", node.Name, target, location)
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err := node.CreateAt(ctx, target, res.repo, idx)
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if err != nil {
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debug.Log("node.CreateAt(%s) error %v", target, 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(target), 0700)
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if err == nil || os.IsExist(errors.Cause(err)) {
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err = node.CreateAt(ctx, target, 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(location, 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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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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var err error
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if !filepath.IsAbs(dst) {
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dst, err = filepath.Abs(dst)
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if err != nil {
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return errors.Wrap(err, "Abs")
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}
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}
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idx := restic.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() *restic.Snapshot {
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return res.sn
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}
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