package dryrun import ( "context" "hash" "io" "github.com/restic/restic/internal/backend" "github.com/restic/restic/internal/debug" ) // Backend passes reads through to an underlying layer and accepts writes, but // doesn't do anything. Also removes are ignored. // So in fact, this backend silently ignores all operations that would modify // the repo and does normal operations else. // This is used for `backup --dry-run`. type Backend struct { b backend.Backend } // statically ensure that Backend implements backend.Backend. var _ backend.Backend = &Backend{} func New(be backend.Backend) *Backend { b := &Backend{b: be} debug.Log("created new dry backend") return b } // Save adds new Data to the backend. func (be *Backend) Save(_ context.Context, h backend.Handle, _ backend.RewindReader) error { if err := h.Valid(); err != nil { return err } // don't save anything, just return ok return nil } // Remove deletes a file from the backend. func (be *Backend) Remove(_ context.Context, _ backend.Handle) error { return nil } func (be *Backend) Connections() uint { return be.b.Connections() } // Location returns the location of the backend. func (be *Backend) Location() string { return "DRY:" + be.b.Location() } // Delete removes all data in the backend. func (be *Backend) Delete(_ context.Context) error { return nil } func (be *Backend) Close() error { return be.b.Close() } func (be *Backend) Hasher() hash.Hash { return be.b.Hasher() } func (be *Backend) HasAtomicReplace() bool { return be.b.HasAtomicReplace() } func (be *Backend) IsNotExist(err error) bool { return be.b.IsNotExist(err) } func (be *Backend) IsPermanentError(err error) bool { return be.b.IsPermanentError(err) } func (be *Backend) List(ctx context.Context, t backend.FileType, fn func(backend.FileInfo) error) error { return be.b.List(ctx, t, fn) } func (be *Backend) Load(ctx context.Context, h backend.Handle, length int, offset int64, fn func(io.Reader) error) error { return be.b.Load(ctx, h, length, offset, fn) } func (be *Backend) Stat(ctx context.Context, h backend.Handle) (backend.FileInfo, error) { return be.b.Stat(ctx, h) }