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package writer_test
import (
"bytes"
"context"
"encoding/hex"
"io"
"os"
"testing"
"code.tvl.fyi/tvix/nar-bridge/pkg/reader"
"code.tvl.fyi/tvix/nar-bridge/pkg/writer"
storev1pb "code.tvl.fyi/tvix/store/protos"
"github.com/stretchr/testify/require"
"lukechampine.com/blake3"
)
func mustDigest(d *storev1pb.Directory) []byte {
dgst, err := d.Digest()
if err != nil {
panic(err)
}
return dgst
}
func TestSymlink(t *testing.T) {
pathInfo := &storev1pb.PathInfo{
Node: &storev1pb.Node{
Node: &storev1pb.Node_Symlink{
Symlink: &storev1pb.SymlinkNode{
Name: []byte("doesntmatter"),
Target: []byte("/nix/store/somewhereelse"),
},
},
},
}
var buf bytes.Buffer
err := writer.Export(&buf, pathInfo, func([]byte) (*storev1pb.Directory, error) {
panic("no directories expected")
}, func([]byte) (io.ReadCloser, error) {
panic("no files expected")
})
require.NoError(t, err, "exporter shouldn't fail")
f, err := os.Open("../../testdata/symlink.nar")
require.NoError(t, err)
bytesExpected, err := io.ReadAll(f)
if err != nil {
panic(err)
}
require.Equal(t, bytesExpected, buf.Bytes(), "expected nar contents to match")
}
func TestRegular(t *testing.T) {
// The blake3 digest of the 0x01 byte.
BLAKE3_DIGEST_0X01 := []byte{
0x48, 0xfc, 0x72, 0x1f, 0xbb, 0xc1, 0x72, 0xe0, 0x92, 0x5f, 0xa2, 0x7a, 0xf1, 0x67, 0x1d,
0xe2, 0x25, 0xba, 0x92, 0x71, 0x34, 0x80, 0x29, 0x98, 0xb1, 0x0a, 0x15, 0x68, 0xa1, 0x88,
0x65, 0x2b,
}
pathInfo := &storev1pb.PathInfo{
Node: &storev1pb.Node{
Node: &storev1pb.Node_File{
File: &storev1pb.FileNode{
Name: []byte("doesntmatter"),
Digest: BLAKE3_DIGEST_0X01,
Size: 1,
Executable: false,
},
},
},
}
var buf bytes.Buffer
err := writer.Export(&buf, pathInfo, func([]byte) (*storev1pb.Directory, error) {
panic("no directories expected")
}, func(blobRef []byte) (io.ReadCloser, error) {
if !bytes.Equal(blobRef, BLAKE3_DIGEST_0X01) {
panic("unexpected blobref")
}
return io.NopCloser(bytes.NewBuffer([]byte{0x01})), nil
})
require.NoError(t, err, "exporter shouldn't fail")
f, err := os.Open("../../testdata/onebyteregular.nar")
require.NoError(t, err)
bytesExpected, err := io.ReadAll(f)
if err != nil {
panic(err)
}
require.Equal(t, bytesExpected, buf.Bytes(), "expected nar contents to match")
}
func TestEmptyDirectory(t *testing.T) {
// construct empty directory node this refers to
emptyDirectory := &storev1pb.Directory{
Directories: []*storev1pb.DirectoryNode{},
Files: []*storev1pb.FileNode{},
Symlinks: []*storev1pb.SymlinkNode{},
}
emptyDirectoryDigest := mustDigest(emptyDirectory)
pathInfo := &storev1pb.PathInfo{
Node: &storev1pb.Node{
Node: &storev1pb.Node_Directory{
Directory: &storev1pb.DirectoryNode{
Name: []byte("doesntmatter"),
Digest: emptyDirectoryDigest,
Size: 0,
},
},
},
}
var buf bytes.Buffer
err := writer.Export(&buf, pathInfo, func(directoryRef []byte) (*storev1pb.Directory, error) {
if !bytes.Equal(directoryRef, emptyDirectoryDigest) {
panic("unexpected directoryRef")
}
return emptyDirectory, nil
}, func([]byte) (io.ReadCloser, error) {
panic("no files expected")
})
require.NoError(t, err, "exporter shouldn't fail")
f, err := os.Open("../../testdata/emptydirectory.nar")
require.NoError(t, err)
bytesExpected, err := io.ReadAll(f)
if err != nil {
panic(err)
}
require.Equal(t, bytesExpected, buf.Bytes(), "expected nar contents to match")
}
func TestFull(t *testing.T) {
// We pipe nar_1094wph9z4nwlgvsd53abfz8i117ykiv5dwnq9nnhz846s7xqd7d.nar to the exporter,
// 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)
filesMap := make(map[string][]byte, 0)
directoriesMap := make(map[string]*storev1pb.Directory)
r := reader.New(bytes.NewBuffer(narContents))
pathInfo, err := r.Import(
context.Background(),
func(fileReader io.Reader) error {
fileContents, err := io.ReadAll(fileReader)
require.NoError(t, err)
b3Writer := blake3.New(32, nil)
_, err = io.Copy(b3Writer, bytes.NewReader(fileContents))
require.NoError(t, err)
// put it in filesMap
filesMap[hex.EncodeToString(b3Writer.Sum(nil))] = fileContents
return nil
},
func(directory *storev1pb.Directory) error {
dgst := mustDigest(directory)
directoriesMap[hex.EncodeToString(dgst)] = directory
return nil
},
)
require.NoError(t, err)
// done populating everything, now actually test the export :-)
var buf bytes.Buffer
err = writer.Export(
&buf,
pathInfo,
func(directoryRef []byte) (*storev1pb.Directory, error) {
d, found := directoriesMap[hex.EncodeToString(directoryRef)]
if !found {
panic("directories not found")
}
return d, nil
},
func(fileRef []byte) (io.ReadCloser, error) {
fileContents, found := filesMap[hex.EncodeToString(fileRef)]
if !found {
panic("file not found")
}
return io.NopCloser(bytes.NewReader(fileContents)), nil
},
)
require.NoError(t, err, "exporter shouldn't fail")
require.Equal(t, narContents, buf.Bytes())
}
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