1 files changed, 85 insertions, 0 deletions
diff --git a/tvix/nar-bridge-go/pkg/importer/roundtrip_test.go b/tvix/nar-bridge-go/pkg/importer/roundtrip_test.go
new file mode 100644
index 000000000000..c50d332d85dc
--- /dev/null
+++ b/tvix/nar-bridge-go/pkg/importer/roundtrip_test.go
@@ -0,0 +1,85 @@
+package importer_test
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"os"
+	"sync"
+	"testing"
+
+	castorev1pb "code.tvl.fyi/tvix/castore-go"
+	"code.tvl.fyi/tvix/nar-bridge-go/pkg/importer"
+	storev1pb "code.tvl.fyi/tvix/store-go"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRoundtrip(t *testing.T) {
+	// We pipe nar_1094wph9z4nwlgvsd53abfz8i117ykiv5dwnq9nnhz846s7xqd7d.nar to
+	// storev1pb.Export, and store all the file contents and directory objects
+	// received in two hashmaps.
+	// We then feed it to the writer, and test we come up with the same NAR file.
+
+	f, err := os.Open("../../testdata/nar_1094wph9z4nwlgvsd53abfz8i117ykiv5dwnq9nnhz846s7xqd7d.nar")
+	require.NoError(t, err)
+
+	narContents, err := io.ReadAll(f)
+	require.NoError(t, err)
+
+	var mu sync.Mutex
+	blobsMap := make(map[string][]byte, 0)
+	directoriesMap := make(map[string]*castorev1pb.Directory)
+
+	rootNode, _, _, err := importer.Import(
+		context.Background(),
+		bytes.NewBuffer(narContents),
+		func(blobReader io.Reader) ([]byte, error) {
+			// read in contents, we need to put it into filesMap later.
+			contents, err := io.ReadAll(blobReader)
+			require.NoError(t, err)
+
+			dgst := mustBlobDigest(bytes.NewReader(contents))
+
+			// put it in filesMap
+			mu.Lock()
+			blobsMap[base64.StdEncoding.EncodeToString(dgst)] = contents
+			mu.Unlock()
+
+			return dgst, nil
+		},
+		func(directory *castorev1pb.Directory) ([]byte, error) {
+			dgst := mustDirectoryDigest(directory)
+
+			directoriesMap[base64.StdEncoding.EncodeToString(dgst)] = directory
+			return dgst, nil
+		},
+	)
+
+	require.NoError(t, err)
+
+	// done populating everything, now actually test the export :-)
+	var narBuf bytes.Buffer
+	err = storev1pb.Export(
+		&narBuf,
+		rootNode,
+		func(directoryDgst []byte) (*castorev1pb.Directory, error) {
+			d, found := directoriesMap[base64.StdEncoding.EncodeToString(directoryDgst)]
+			if !found {
+				panic(fmt.Sprintf("directory %v not found", base64.StdEncoding.EncodeToString(directoryDgst)))
+			}
+			return d, nil
+		},
+		func(blobDgst []byte) (io.ReadCloser, error) {
+			blobContents, found := blobsMap[base64.StdEncoding.EncodeToString(blobDgst)]
+			if !found {
+				panic(fmt.Sprintf("blob      %v not found", base64.StdEncoding.EncodeToString(blobDgst)))
+			}
+			return io.NopCloser(bytes.NewReader(blobContents)), nil
+		},
+	)
+
+	require.NoError(t, err, "exporter shouldn't fail")
+	require.Equal(t, narContents, narBuf.Bytes())
+}