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package transactional
import (
"github.com/go-git/go-git/v5/plumbing/format/index"
"github.com/go-git/go-git/v5/plumbing/storer"
)
// IndexStorage implements the storer.IndexStorage for the transactional package.
type IndexStorage struct {
storer.IndexStorer
temporal storer.IndexStorer
set bool
}
// NewIndexStorage returns a new IndexStorer based on a base storer and a
// temporal storer.
func NewIndexStorage(s, temporal storer.IndexStorer) *IndexStorage {
return &IndexStorage{
IndexStorer: s,
temporal: temporal,
}
}
// SetIndex honors the storer.IndexStorer interface.
func (s *IndexStorage) SetIndex(idx *index.Index) (err error) {
if err := s.temporal.SetIndex(idx); err != nil {
return err
}
s.set = true
return nil
}
// Index honors the storer.IndexStorer interface.
func (s *IndexStorage) Index() (*index.Index, error) {
if !s.set {
return s.IndexStorer.Index()
}
return s.temporal.Index()
}
// Commit it copies the index from the temporal storage into the base storage.
func (s *IndexStorage) Commit() error {
if !s.set {
return nil
}
idx, err := s.temporal.Index()
if err != nil {
return err
}
return s.IndexStorer.SetIndex(idx)
}
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