mirror of https://github.com/octoleo/restic.git
120 lines
2.4 KiB
Go
120 lines
2.4 KiB
Go
package migrations
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"os"
|
|
"path"
|
|
|
|
"github.com/restic/restic/internal/backend"
|
|
"github.com/restic/restic/internal/backend/s3"
|
|
"github.com/restic/restic/internal/debug"
|
|
"github.com/restic/restic/internal/errors"
|
|
"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(ctx context.Context, repo restic.Repository) (bool, error) {
|
|
be, ok := repo.Backend().(*s3.Backend)
|
|
if !ok {
|
|
debug.Log("backend is not s3")
|
|
return false, nil
|
|
}
|
|
|
|
if be.Layout.Name() != "s3legacy" {
|
|
debug.Log("layout is not s3legacy")
|
|
return false, nil
|
|
}
|
|
|
|
return true, nil
|
|
}
|
|
|
|
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 err
|
|
}
|
|
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 backend.Layout, t restic.FileType) error {
|
|
printErr := func(err error) {
|
|
fmt.Fprintf(os.Stderr, "renaming file returned error: %v\n", err)
|
|
}
|
|
|
|
for name := range be.List(ctx, t) {
|
|
h := restic.Handle{Type: t, Name: name}
|
|
debug.Log("move %v", h)
|
|
|
|
retry(maxErrors, printErr, func() error {
|
|
return be.Rename(h, l)
|
|
})
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// Apply runs the migration.
|
|
func (m *S3Layout) Apply(ctx context.Context, repo restic.Repository) error {
|
|
be, ok := repo.Backend().(*s3.Backend)
|
|
if !ok {
|
|
debug.Log("backend is not s3")
|
|
return errors.New("backend is not s3")
|
|
}
|
|
|
|
oldLayout := &backend.S3LegacyLayout{
|
|
Path: be.Path(),
|
|
Join: path.Join,
|
|
}
|
|
|
|
newLayout := &backend.DefaultLayout{
|
|
Path: be.Path(),
|
|
Join: path.Join,
|
|
}
|
|
|
|
be.Layout = oldLayout
|
|
|
|
for _, t := range []restic.FileType{
|
|
restic.SnapshotFile,
|
|
restic.DataFile,
|
|
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"
|
|
}
|