check for os.PathError

Signed-off-by: Meredith Lancaster <malancas@github.com>

pkg/cmd/attestation/verification/attestation.go

@@ -53,13 +53,21 @@ func GetLocalAttestations(path string) ([]*api.Attestation, error) {
 	case ".json":
 		attestations, err := loadBundleFromJSONFile(path)
 		if err != nil {
-			return nil, fmt.Errorf("bundle could not be loaded from JSON file at %s", path)
+			var pathErr *os.PathError
+			if errors.As(err, &pathErr) {
+				return nil, fmt.Errorf("bundle could not be loaded from JSON file at %s", path)
+			}
+			return nil, fmt.Errorf("bundle content could not be parsed")
 		}
 		return attestations, nil
 	case ".jsonl":
 		attestations, err := loadBundlesFromJSONLinesFile(path)
 		if err != nil {
-			return nil, fmt.Errorf("bundles could not be loaded from JSON lines file at %s", path)
+			var pathErr *os.PathError
+			if errors.As(err, &pathErr) {
+				return nil, fmt.Errorf("bundles could not be loaded from JSON lines file at %s", path)
+			}
+			return nil, fmt.Errorf("bundle content could not be parsed")
 		}
 		return attestations, nil
 	}

pkg/cmd/attestation/verification/attestation_test.go

@@ -87,6 +87,14 @@ func TestGetLocalAttestations(t *testing.T) {
 		require.ErrorIs(t, err, ErrUnrecognisedBundleExtension)
 		require.Nil(t, attestations)
 	})
+
+	t.Run("with non-existent bundle file", func(t *testing.T) {
+		path := "../test/data/not-found-bundle.json"
+		attestations, err := GetLocalAttestations(path)
+
+		require.ErrorContains(t, err, "bundle could not be loaded from JSON file")
+		require.Nil(t, attestations)
+	})
 }
 
 func TestFilterAttestations(t *testing.T) {

pkg/cmd/attestation/verification/sigstore.go

@@ -186,7 +186,7 @@ func (v *LiveSigstoreVerifier) Verify(attestations []*api.Attestation, policy ve
 		verifier, issuer, err := v.chooseVerifier(apr.Attestation.Bundle)
 		if err != nil {
 			return &SigstoreResults{
-				Error: fmt.Errorf("failed to find recognized issuer from bundle content: %v", err),
+				Error: fmt.Errorf("failed to find recognized issuer from bundle content"),
 			}
 		}