storage: IndexStorer implementation

1 files changed, 44 insertions, 0 deletions

diff --git a/storage/filesystem/index.go b/storage/filesystem/index.go
new file mode 100644
index 0000000..456ef0b
--- /dev/null
+++ b/storage/filesystem/index.go
@@ -0,0 +1,44 @@
+package filesystem
+
+import (
+	"os"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/format/index"
+	"gopkg.in/src-d/go-git.v4/storage/filesystem/internal/dotgit"
+)
+
+type IndexStorage struct {
+	dir *dotgit.DotGit
+}
+
+func (s *IndexStorage) SetIndex(idx *index.Index) error {
+	f, err := s.dir.IndexWriter()
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	e := index.NewEncoder(f)
+	return e.Encode(idx)
+}
+
+func (s *IndexStorage) Index() (*index.Index, error) {
+	idx := &index.Index{
+		Version: 2,
+	}
+
+	f, err := s.dir.Index()
+	if err != nil {
+		if os.IsNotExist(err) {
+			return idx, nil
+		}
+
+		return nil, err
+	}
+
+	defer f.Close()
+
+	d := index.NewDecoder(f)
+	return idx, d.Decode(idx)
+}