Replace mock OCI client with working local client

pkg/oci/local.go

@@ -0,0 +1,101 @@
+package oci
+
+import (
+	"context"
+	"io"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/opencontainers/go-digest"
+)
+
+var _ Client = &LocalClient{}
+
+type LocalClient struct {
+	mx           sync.RWMutex
+	rootDir      string
+	imageEventCh chan ImageEvent
+	errCh        chan error
+}
+
+func NewLocalClient(rootDir string) *LocalClient {
+	return &LocalClient{
+		rootDir: rootDir,
+	}
+}
+
+func (m *LocalClient) Add() error {
+	return nil
+}
+
+func (m *LocalClient) Name() string {
+	return "local"
+}
+
+func (m *LocalClient) Verify(ctx context.Context) error {
+	_, err := os.Stat(m.rootDir)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (m *LocalClient) Subscribe(ctx context.Context) (<-chan ImageEvent, <-chan error, error) {
+	return nil, nil, nil
+}
+
+func (m *LocalClient) ListImages(ctx context.Context) ([]Image, error) {
+	m.mx.RLock()
+	defer m.mx.RUnlock()
+
+	return nil, nil
+}
+
+func (m *LocalClient) AllIdentifiers(ctx context.Context, img Image) ([]string, error) {
+	return []string{img.Digest.String()}, nil
+}
+
+func (m *LocalClient) Resolve(ctx context.Context, ref string) (digest.Digest, error) {
+	return "", nil
+}
+
+func (m *LocalClient) Size(ctx context.Context, dgst digest.Digest) (int64, error) {
+	m.mx.RLock()
+	defer m.mx.RUnlock()
+
+	p := m.pathForDigest(dgst)
+	fi, err := os.Stat(p)
+	if err != nil {
+		return 0, err
+	}
+	return fi.Size(), nil
+}
+
+func (m *LocalClient) GetManifest(ctx context.Context, dgst digest.Digest) ([]byte, string, error) {
+	m.mx.RLock()
+	defer m.mx.RUnlock()
+
+	p := m.pathForDigest(dgst)
+	b, err := os.ReadFile(p)
+	if err != nil {
+		return nil, "", err
+	}
+	return b, "", nil
+}
+
+func (m *LocalClient) GetBlob(ctx context.Context, dgst digest.Digest) (io.ReadCloser, error) {
+	m.mx.RLock()
+	defer m.mx.RUnlock()
+
+	p := m.pathForDigest(dgst)
+	f, err := os.Open(p)
+	if err != nil {
+		return nil, err
+	}
+	return f, nil
+}
+
+func (m *LocalClient) pathForDigest(dgst digest.Digest) string {
+	return filepath.Join(m.rootDir, "blobs", dgst.Algorithm().String(), dgst.Encoded())
+}

pkg/oci/oci_test.go

@@ -84,7 +84,10 @@ func TestOCIClient(t *testing.T) {
 		client:      containerdClient,
 	}
 
-	for _, ociClient := range []Client{remoteContainerd, localContainerd} {
+	localClient := NewLocalClient(t.TempDir())
+
+	ociClients := []Client{remoteContainerd, localContainerd, localClient}
+	for _, ociClient := range ociClients {
 		t.Run(ociClient.Name(), func(t *testing.T) {
 			t.Parallel()
 

pkg/state/state_test.go

@@ -45,7 +45,7 @@
 				require.NoError(t, err)
 				imgs = append(imgs, img)
 			}
-			ociClient := oci.NewMockClient(imgs)
+			ociClient := oci.NewLocalClient(imgs)
 			router := routing.NewMemoryRouter(map[string][]netip.AddrPort{}, netip.MustParseAddrPort("127.0.0.1:5000"))
 
 			ctx, cancel := context.WithCancel(context.TODO())