From 0dddf51fd5f3068a8e71ce1ee3b34f7a4d8ab56e Mon Sep 17 00:00:00 2001
From: Keith Zantow <kzantow@gmail.com>
Date: Mon, 21 Nov 2022 09:26:11 -0500
Subject: [PATCH] chore: add debug logging for decode errors (#1352)

---
 syft/formats/formats.go              | 5 +++++
 syft/formats/spdxtagvalue/decoder.go | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/syft/formats/formats.go b/syft/formats/formats.go
index 32a537957..7275e54a6 100644
--- a/syft/formats/formats.go
+++ b/syft/formats/formats.go
@@ -2,10 +2,12 @@ package formats
 
 import (
 	"bytes"
+	"errors"
 	"fmt"
 	"io"
 	"strings"
 
+	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/formats/cyclonedxjson"
 	"github.com/anchore/syft/syft/formats/cyclonedxxml"
 	"github.com/anchore/syft/syft/formats/github"
@@ -35,6 +37,9 @@ func Formats() []sbom.Format {
 func Identify(by []byte) sbom.Format {
 	for _, f := range Formats() {
 		if err := f.Validate(bytes.NewReader(by)); err != nil {
+			if !errors.Is(err, sbom.ErrValidationNotSupported) {
+				log.Debugf("format %s returned err: %+v", f.ID(), err)
+			}
 			continue
 		}
 		return f
diff --git a/syft/formats/spdxtagvalue/decoder.go b/syft/formats/spdxtagvalue/decoder.go
index d13c07560..a52d5138c 100644
--- a/syft/formats/spdxtagvalue/decoder.go
+++ b/syft/formats/spdxtagvalue/decoder.go
@@ -13,7 +13,7 @@ import (
 func decoder(reader io.Reader) (*sbom.SBOM, error) {
 	doc, err := tvloader.Load2_3(reader)
 	if err != nil {
-		return nil, fmt.Errorf("unable to decode spdx-json: %w", err)
+		return nil, fmt.Errorf("unable to decode spdx-tag-value: %w", err)
 	}
 
 	return spdxhelpers.ToSyftModel(doc)