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repair snapshots: Port to use walker.TreeRewriter
This commit is contained in:
Michael Eischer
parent
1bd1f3008d
commit
e17ee40a31
1 changed files with 56 additions and 124 deletions
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@ -6,6 +6,7 @@ import (
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/debug"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/walker"
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"golang.org/x/sync/errgroup"
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"github.com/spf13/cobra"
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@ -106,8 +107,56 @@ func runRepairSnapshots(ctx context.Context, gopts GlobalOptions, opts RepairOpt
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}
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func repairSnapshots(ctx context.Context, opts RepairOptions, repo restic.Repository, snapshots []*restic.Snapshot) error {
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replaces := make(idMap)
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seen := restic.NewIDSet()
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// Three error cases are checked:
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// - tree is a nil tree (-> will be replaced by an empty tree)
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// - trees which cannot be loaded (-> the tree contents will be removed)
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// - files whose contents are not fully available (-> file will be modified)
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rewriter := walker.NewTreeRewriter(walker.RewriteOpts{
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RewriteNode: func(node *restic.Node, path string) *restic.Node {
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if node.Type != "file" {
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return node
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}
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ok := true
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var newContent restic.IDs
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var newSize uint64
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// check all contents and remove if not available
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for _, id := range node.Content {
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if size, found := repo.LookupBlobSize(id, restic.DataBlob); !found {
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ok = false
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} else {
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newContent = append(newContent, id)
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newSize += uint64(size)
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}
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}
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if !ok {
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if newSize == 0 {
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Printf("removed defective file '%v'\n", path+node.Name)
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node = nil
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} else {
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Printf("repaired defective file '%v'\n", path+node.Name)
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node.Content = newContent
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node.Size = newSize
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}
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}
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return node
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},
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RewriteFailedTree: func(nodeID restic.ID, path string, _ error) (restic.ID, error) {
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if path == "/" {
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// remove snapshots with invalid root node
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return restic.ID{}, nil
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}
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// If a subtree fails to load, remove it
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Printf("removed defective dir '%v'", path)
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emptyID, err := restic.SaveTree(ctx, repo, &restic.Tree{})
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if err != nil {
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return restic.ID{}, err
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}
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return emptyID, nil
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},
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AllowUnstableSerialization: true,
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})
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deleteSn := restic.NewIDSet()
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Verbosef("check and repair %d snapshots\n", len(snapshots))
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@ -118,15 +167,16 @@ func repairSnapshots(ctx context.Context, opts RepairOptions, repo restic.Reposi
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for _, sn := range snapshots {
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debug.Log("process snapshot %v", sn.ID())
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Printf("%v:\n", sn)
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newID, changed, lErr, err := repairTree(ctx, opts, repo, "/", sn.Tree, replaces, seen)
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newID, err := rewriter.RewriteTree(ctx, repo, "/", *sn.Tree)
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switch {
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case err != nil:
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return err
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case lErr:
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case newID.IsNull():
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Printf("the root tree is damaged -> delete snapshot.\n")
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deleteSn.Insert(*sn.ID())
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case changed:
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err = changeSnapshot(ctx, opts.DryRun, repo, sn, newID)
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case !newID.Equal(*sn.Tree):
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err = changeSnapshot(ctx, opts.DryRun, repo, sn, &newID)
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if err != nil {
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return err
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}
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@ -176,121 +226,3 @@ func changeSnapshot(ctx context.Context, dryRun bool, repo restic.Repository, sn
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}
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return nil
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}
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type idMap map[restic.ID]restic.ID
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// repairTree checks and repairs a tree and all its subtrees
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// Three error cases are checked:
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// - tree is a nil tree (-> will be replaced by an empty tree)
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// - trees which cannot be loaded (-> the tree contents will be removed)
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// - files whose contents are not fully available (-> file will be modified)
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// In case of an error, the changes made depends on:
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// - opts.Append: string to append to "repared" names; if empty files will not repaired but deleted
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// - opts.DryRun: if set to true, only print out what to but don't change anything
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// Returns:
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// - the new ID
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// - whether the ID changed
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// - whether there was a load error when loading this tre
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// - error for other errors (these are errors when saving a tree)
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func repairTree(ctx context.Context, opts RepairOptions, repo restic.Repository, path string, treeID *restic.ID, replaces idMap, seen restic.IDSet) (*restic.ID, bool, bool, error) {
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// handle and repair nil trees
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if treeID == nil {
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empty, err := emptyTree(ctx, repo, opts.DryRun)
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Printf("repaired nil tree '%v'\n", path)
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return &empty, true, false, err
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}
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// check if tree was already changed
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newID, ok := replaces[*treeID]
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if ok {
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return &newID, true, false, nil
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}
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// check if tree was seen but not changed
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if seen.Has(*treeID) {
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return treeID, false, false, nil
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}
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tree, err := restic.LoadTree(ctx, repo, *treeID)
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if err != nil {
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// mark as load error
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return &newID, false, true, nil
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}
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var newNodes []*restic.Node
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changed := false
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for _, node := range tree.Nodes {
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switch node.Type {
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case "file":
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ok := true
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var newContent restic.IDs
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var newSize uint64
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// check all contents and remove if not available
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for _, id := range node.Content {
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if size, found := repo.LookupBlobSize(id, restic.DataBlob); !found {
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ok = false
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} else {
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newContent = append(newContent, id)
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newSize += uint64(size)
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}
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}
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if !ok {
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changed = true
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if newSize == 0 {
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Printf("removed defective file '%v'\n", path+node.Name)
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continue
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}
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Printf("repaired defective file '%v'\n", path+node.Name)
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node.Content = newContent
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node.Size = newSize
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}
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case "dir":
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// rewrite if necessary
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newID, c, lErr, err := repairTree(ctx, opts, repo, path+node.Name+"/", node.Subtree, replaces, seen)
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switch {
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case err != nil:
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return newID, true, false, err
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case lErr:
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// If we get an error, we remove this subtree
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changed = true
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Printf("replaced defective dir '%v'", path+node.Name)
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empty, err := emptyTree(ctx, repo, opts.DryRun)
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if err != nil {
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return newID, true, false, err
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}
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node.Subtree = &empty
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case c:
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node.Subtree = newID
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changed = true
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}
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}
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newNodes = append(newNodes, node)
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}
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if !changed {
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seen.Insert(*treeID)
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return treeID, false, false, nil
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}
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tree.Nodes = newNodes
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if !opts.DryRun {
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newID, err = restic.SaveTree(ctx, repo, tree)
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if err != nil {
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return &newID, true, false, err
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}
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Printf("modified tree %v, new id: %v\n", treeID.Str(), newID.Str())
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} else {
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Printf("would have modified tree %v\n", treeID.Str())
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}
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replaces[*treeID] = newID
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return &newID, true, false, nil
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}
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func emptyTree(ctx context.Context, repo restic.Repository, dryRun bool) (restic.ID, error) {
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if !dryRun {
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return restic.SaveTree(ctx, repo, &restic.Tree{})
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}
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return restic.ID{}, nil
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}
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