mirror of https://github.com/octoleo/restic.git
92 lines
2.3 KiB
Go
92 lines
2.3 KiB
Go
package walker
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import (
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"context"
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"fmt"
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"path"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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)
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// SelectByNameFunc returns true for all items that should be included (files and
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// dirs). If false is returned, files are ignored and dirs are not even walked.
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type SelectByNameFunc func(item string) bool
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type TreeFilterVisitor struct {
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SelectByName SelectByNameFunc
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PrintExclude func(string)
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}
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type BlobLoadSaver interface {
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restic.BlobSaver
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restic.BlobLoader
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}
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func FilterTree(ctx context.Context, repo BlobLoadSaver, nodepath string, nodeID restic.ID, visitor *TreeFilterVisitor) (newNodeID restic.ID, err error) {
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curTree, err := restic.LoadTree(ctx, repo, nodeID)
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if err != nil {
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return restic.ID{}, err
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}
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// check that we can properly encode this tree without losing information
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// The alternative of using json/Decoder.DisallowUnknownFields() doesn't work as we use
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// a custom UnmarshalJSON to decode trees, see also https://github.com/golang/go/issues/41144
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testID, err := restic.SaveTree(ctx, repo, curTree)
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if err != nil {
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return restic.ID{}, err
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}
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if nodeID != testID {
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return restic.ID{}, fmt.Errorf("cannot encode tree at %q without loosing information", nodepath)
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}
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debug.Log("filterTree: %s, nodeId: %s\n", nodepath, nodeID.Str())
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changed := false
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tb := restic.NewTreeJSONBuilder()
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for _, node := range curTree.Nodes {
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path := path.Join(nodepath, node.Name)
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if !visitor.SelectByName(path) {
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if visitor.PrintExclude != nil {
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visitor.PrintExclude(path)
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}
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changed = true
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continue
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}
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if node.Subtree == nil {
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err = tb.AddNode(node)
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if err != nil {
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return restic.ID{}, err
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}
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continue
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}
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newID, err := FilterTree(ctx, repo, path, *node.Subtree, visitor)
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if err != nil {
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return restic.ID{}, err
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}
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if !node.Subtree.Equal(newID) {
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changed = true
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}
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node.Subtree = &newID
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err = tb.AddNode(node)
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if err != nil {
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return restic.ID{}, err
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}
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}
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if changed {
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tree, err := tb.Finalize()
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if err != nil {
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return restic.ID{}, err
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}
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// Save new tree
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newTreeID, _, _, err := repo.SaveBlob(ctx, restic.TreeBlob, tree, restic.ID{}, false)
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debug.Log("filterTree: save new tree for %s as %v\n", nodepath, newTreeID)
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return newTreeID, err
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}
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return nodeID, nil
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}
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