drop support for s3legacy layout

internal/migrations/s3_layout.go

@@ -1,123 +0,0 @@
-package migrations
-
-import (
-	"context"
-	"fmt"
-	"os"
-	"path"
-
-	"github.com/restic/restic/internal/backend"
-	"github.com/restic/restic/internal/backend/layout"
-	"github.com/restic/restic/internal/backend/s3"
-	"github.com/restic/restic/internal/debug"
-	"github.com/restic/restic/internal/errors"
-	"github.com/restic/restic/internal/repository"
-	"github.com/restic/restic/internal/restic"
-)
-
-func init() {
-	register(&S3Layout{})
-}
-
-// S3Layout migrates a repository on an S3 backend from the "s3legacy" to the
-// "default" layout.
-type S3Layout struct{}
-
-// Check tests whether the migration can be applied.
-func (m *S3Layout) Check(_ context.Context, repo restic.Repository) (bool, string, error) {
-	be := repository.AsS3Backend(repo.(*repository.Repository))
-	if be == nil {
-		debug.Log("backend is not s3")
-		return false, "backend is not s3", nil
-	}
-
-	if be.Layout.Name() != "s3legacy" {
-		debug.Log("layout is not s3legacy")
-		return false, "not using the legacy s3 layout", nil
-	}
-
-	return true, "", nil
-}
-
-func (m *S3Layout) RepoCheck() bool {
-	return false
-}
-
-func retry(max int, fail func(err error), f func() error) error {
-	var err error
-	for i := 0; i < max; i++ {
-		err = f()
-		if err == nil {
-			return nil
-		}
-		if fail != nil {
-			fail(err)
-		}
-	}
-	return err
-}
-
-// maxErrors for retrying renames on s3.
-const maxErrors = 20
-
-func (m *S3Layout) moveFiles(ctx context.Context, be *s3.Backend, l layout.Layout, t restic.FileType) error {
-	printErr := func(err error) {
-		fmt.Fprintf(os.Stderr, "renaming file returned error: %v\n", err)
-	}
-
-	return be.List(ctx, t, func(fi backend.FileInfo) error {
-		h := backend.Handle{Type: t, Name: fi.Name}
-		debug.Log("move %v", h)
-
-		return retry(maxErrors, printErr, func() error {
-			return be.Rename(ctx, h, l)
-		})
-	})
-}
-
-// Apply runs the migration.
-func (m *S3Layout) Apply(ctx context.Context, repo restic.Repository) error {
-	be := repository.AsS3Backend(repo.(*repository.Repository))
-	if be == nil {
-		debug.Log("backend is not s3")
-		return errors.New("backend is not s3")
-	}
-
-	oldLayout := &layout.S3LegacyLayout{
-		Path: be.Path(),
-		Join: path.Join,
-	}
-
-	newLayout := &layout.DefaultLayout{
-		Path: be.Path(),
-		Join: path.Join,
-	}
-
-	be.Layout = oldLayout
-
-	for _, t := range []restic.FileType{
-		restic.SnapshotFile,
-		restic.PackFile,
-		restic.KeyFile,
-		restic.LockFile,
-	} {
-		err := m.moveFiles(ctx, be, newLayout, t)
-		if err != nil {
-			return err
-		}
-	}
-
-	be.Layout = newLayout
-
-	return nil
-}
-
-// Name returns the name for this migration.
-func (m *S3Layout) Name() string {
-	return "s3_layout"
-}
-
-// Desc returns a short description what the migration does.
-func (m *S3Layout) Desc() string {
-	return "move files from 's3legacy' to the 'default' repository layout"
-}