g.once.Do(func() {
		for i := len(g.cleanUpFns) - 1; i >= 0; i-- {
			g.cleanUpFns[i]()
		}
	})
	return nil
}

// compressionIndexEncrypter returns a function that will read data from input,
// encrypt it using the provided key and return the result.
func compressionIndexEncrypter(key crypto.ObjectKey, input func() []byte) func() []byte {
	var data []byte
	var fetched bool
	return func() []byte {
		if !fetched {

		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		if dstOpts.IndexCB != nil {
			dstOpts.IndexCB = compressionIndexEncrypter(objectEncryptionKey, dstOpts.IndexCB)
		}
	}

	srcInfo.PutObjReader = pReader
	copyObjectPart := objectAPI.CopyObjectPart

	// Copy source object to destination, if source and destination

			if err != nil {
				writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
				return
			}
			if dstOpts.IndexCB != nil {
				dstOpts.IndexCB = compressionIndexEncrypter(objEncKey, dstOpts.IndexCB)
			}
		}
	}

	srcInfo.PutObjReader = pReader

	srcInfo.UserDefined, err = getCpObjMetadataFromHeader(ctx, r, srcInfo.UserDefined)
	if err != nil {