Distinguish LFS object errors to ignore missing objects during migration (#31702)

Fix #31137.

Replace #31623 #31697.

When migrating LFS objects, if there's any object that failed (like some
objects are losted, which is not really critical), Gitea will stop
migrating LFS immediately but treat the migration as successful.

This PR checks the error according to the [LFS api
doc](https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#successful-responses).

> LFS object error codes should match HTTP status codes where possible:
> 
> - 404 - The object does not exist on the server.
> - 409 - The specified hash algorithm disagrees with the server's
acceptable options.
> - 410 - The object was removed by the owner.
> - 422 - Validation error.

If the error is `404`, it's safe to ignore it and continue migration.
Otherwise, stop the migration and mark it as failed to ensure data
integrity of LFS objects.

And maybe we should also ignore others errors (maybe `410`? I'm not sure
what's the difference between "does not exist" and "removed by the
owner".), we can add it later when some users report that they have
failed to migrate LFS because of an error which should be ignored.
This commit is contained in:
Jason Song 2024-07-31 18:29:48 +08:00 committed by GitHub
parent 9ac57c957f
commit 09b56fc069
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
4 changed files with 46 additions and 4 deletions

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@ -136,14 +136,13 @@ func (c *HTTPClient) performOperation(ctx context.Context, objects []Pointer, dc
for _, object := range result.Objects {
if object.Error != nil {
objectError := errors.New(object.Error.Message)
log.Trace("Error on object %v: %v", object.Pointer, objectError)
log.Trace("Error on object %v: %v", object.Pointer, object.Error)
if uc != nil {
if _, err := uc(object.Pointer, objectError); err != nil {
if _, err := uc(object.Pointer, object.Error); err != nil {
return err
}
} else {
if err := dc(object.Pointer, nil, objectError); err != nil {
if err := dc(object.Pointer, nil, object.Error); err != nil {
return err
}
}

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@ -4,7 +4,11 @@
package lfs
import (
"errors"
"fmt"
"time"
"code.gitea.io/gitea/modules/util"
)
const (
@ -64,6 +68,39 @@ type ObjectError struct {
Message string `json:"message"`
}
var (
// See https://github.com/git-lfs/git-lfs/blob/main/docs/api/batch.md#successful-responses
// LFS object error codes should match HTTP status codes where possible:
// 404 - The object does not exist on the server.
// 409 - The specified hash algorithm disagrees with the server's acceptable options.
// 410 - The object was removed by the owner.
// 422 - Validation error.
ErrObjectNotExist = util.ErrNotExist // the object does not exist on the server
ErrObjectHashMismatch = errors.New("the specified hash algorithm disagrees with the server's acceptable options")
ErrObjectRemoved = errors.New("the object was removed by the owner")
ErrObjectValidation = errors.New("validation error")
)
func (e *ObjectError) Error() string {
return fmt.Sprintf("[%d] %s", e.Code, e.Message)
}
func (e *ObjectError) Unwrap() error {
switch e.Code {
case 404:
return ErrObjectNotExist
case 409:
return ErrObjectHashMismatch
case 410:
return ErrObjectRemoved
case 422:
return ErrObjectValidation
default:
return errors.New(e.Message)
}
}
// PointerBlob associates a Git blob with a Pointer.
type PointerBlob struct {
Hash string

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@ -5,6 +5,7 @@ package repository
import (
"context"
"errors"
"fmt"
"io"
"strings"
@ -181,6 +182,10 @@ func StoreMissingLfsObjectsInRepository(ctx context.Context, repo *repo_model.Re
downloadObjects := func(pointers []lfs.Pointer) error {
err := lfsClient.Download(ctx, pointers, func(p lfs.Pointer, content io.ReadCloser, objectError error) error {
if objectError != nil {
if errors.Is(objectError, lfs.ErrObjectNotExist) {
log.Warn("Repo[%-v]: Ignore missing LFS object %-v: %v", repo, p, objectError)
return nil
}
return objectError
}

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@ -169,6 +169,7 @@ func MigrateRepositoryGitData(ctx context.Context, u *user_model.User,
lfsClient := lfs.NewClient(endpoint, httpTransport)
if err = repo_module.StoreMissingLfsObjectsInRepository(ctx, repo, gitRepo, lfsClient); err != nil {
log.Error("Failed to store missing LFS objects for repository: %v", err)
return repo, fmt.Errorf("StoreMissingLfsObjectsInRepository: %w", err)
}
}
}