restic/restorer.go

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package restic
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import (
"fmt"
"os"
"path/filepath"
"syscall"
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"github.com/juju/arrar"
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"github.com/restic/restic/backend"
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"github.com/restic/restic/server"
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)
type Restorer struct {
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s *server.Server
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sn *Snapshot
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Error func(dir string, node *Node, err error) error
Filter func(item string, dstpath string, node *Node) bool
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}
// NewRestorer creates a restorer preloaded with the content from the snapshot snid.
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func NewRestorer(s *server.Server, snid backend.ID) (*Restorer, error) {
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r := &Restorer{s: s}
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var err error
r.sn, err = LoadSnapshot(s, 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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}
// abort on all errors
r.Error = func(string, *Node, error) error { return err }
return r, nil
}
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func (res *Restorer) to(dst string, dir string, treeBlob server.Blob) error {
tree, err := LoadTree(res.s, treeBlob)
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if err != nil {
return res.Error(dir, nil, arrar.Annotate(err, "LoadTree"))
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}
for _, node := range tree.Nodes {
dstpath := filepath.Join(dst, dir, node.Name)
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if res.Filter == nil ||
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res.Filter(filepath.Join(dir, node.Name), dstpath, node) {
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err := node.CreateAt(dstpath, tree.Map, res.s)
// Did it fail because of ENOENT?
if arrar.Check(err, func(err error) bool {
if pe, ok := err.(*os.PathError); ok {
errn, ok := pe.Err.(syscall.Errno)
return ok && errn == syscall.ENOENT
}
return false
}) {
// Create parent directories and retry
err = os.MkdirAll(filepath.Dir(dstpath), 0700)
if err == nil || err == os.ErrExist {
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err = node.CreateAt(dstpath, tree.Map, res.s)
}
}
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if err != nil {
err = res.Error(dstpath, node, arrar.Annotate(err, "create node"))
if err != nil {
return err
}
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}
}
if node.Type == "dir" {
if node.Subtree == nil {
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return fmt.Errorf("Dir without subtree in tree %s", treeBlob)
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}
subp := filepath.Join(dir, node.Name)
subtreeBlob, err := tree.Map.FindID(node.Subtree)
if err != nil {
err = res.Error(subp, node, arrar.Annotate(err, "lookup subtree"))
if err != nil {
return err
}
}
err = res.to(dst, subp, subtreeBlob)
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if err != nil {
err = res.Error(subp, node, arrar.Annotate(err, "restore subtree"))
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if err != nil {
return err
}
}
}
}
return nil
}
// RestoreTo creates the directories and files in the snapshot below dir.
// Before an item is created, res.Filter is called.
func (res *Restorer) RestoreTo(dir string) error {
return res.to(dir, "", res.sn.Tree)
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}
func (res *Restorer) Snapshot() *Snapshot {
return res.sn
}