Update SBOM file format and extract different payload (#1123)

* Update SBOM file format and extract different payload

* Update changelog

* Strip any leading v from version string

CHANGELOG.md

@@ -11,6 +11,11 @@ All notable changes to `src-cli` are documented in this file.
 
 ## Unreleased
 
+## 5.9.1
+
+- Update SBOM output file extension from `.json` to `.cdx.json` [#1123](https://github.com/sourcegraph/src-cli/pull/1123)
+- Improve SBOM compatibility with scanning tools [#1123](https://github.com/sourcegraph/src-cli/pull/1123)
+
 ## 5.9.0
 
 ## 5.8.2

cmd/src/sbom_fetch.go

@@ -10,7 +10,6 @@ import (
 	"net/http"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
 	"strings"
 	"unicode"
@@ -71,12 +70,12 @@ Examples:
 		if versionFlag == nil || *versionFlag == "" {
 			return cmderrors.Usage("version is required")
 		}
-		c.version = *versionFlag
+		c.version = sanitizeVersion(*versionFlag)
 
 		if outputDirFlag == nil || *outputDirFlag == "" {
 			return cmderrors.Usage("output directory is required")
 		}
-		c.outputDir = getOutputDir(*outputDirFlag, *versionFlag)
+		c.outputDir = getOutputDir(*outputDirFlag, c.version)
 
 		if internalReleaseFlag == nil || !*internalReleaseFlag {
 			c.internalRelease = false
@@ -283,7 +282,19 @@ func extractSBOM(attestationBytes []byte) (string, error) {
 		return "", fmt.Errorf("failed to decode payload: %w", err)
 	}
 
-	return string(decodedPayload), nil
+	// Unmarshal the decoded payload to extract predicate
+	var payload map[string]json.RawMessage
+	if err := json.Unmarshal(decodedPayload, &payload); err != nil {
+		return "", fmt.Errorf("failed to unmarshal decoded payload: %w", err)
+	}
+
+	// Extract just the predicate field
+	predicate, ok := payload["predicate"]
+	if !ok {
+		return "", fmt.Errorf("no predicate field found in payload")
+	}
+
+	return string(predicate), nil
 }
 
 func (c sbomConfig) storeSBOM(sbom string, image string) error {
@@ -296,7 +307,7 @@ func (c sbomConfig) storeSBOM(sbom string, image string) error {
 	}, image)
 
 	// Create the output file path
-	outputFile := filepath.Join(c.outputDir, safeImageName+".json")
+	outputFile := filepath.Join(c.outputDir, safeImageName+".cdx.json")
 
 	// Ensure the output directory exists
 	if err := os.MkdirAll(c.outputDir, 0755); err != nil {
@@ -311,10 +322,6 @@ func (c sbomConfig) storeSBOM(sbom string, image string) error {
 	return nil
 }
 
-func getOutputDir(parentDir, version string) string {
-	return path.Join(parentDir, "sourcegraph-"+version)
-}
-
 // getImageReleaseListURL returns the URL for the list of images in a release, based on the version and whether it's an internal release.
 func (c *sbomConfig) getImageReleaseListURL() string {
 	if c.internalRelease {

cmd/src/sbom_utils.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"net/http"
 	"os/exec"
+	"path"
 	"strings"
 	"time"
 )
@@ -190,3 +191,12 @@ func spinner(name string, stop chan bool) {
 		}
 	}
 }
+
+func getOutputDir(parentDir, version string) string {
+	return path.Join(parentDir, "sourcegraph-"+version)
+}
+
+// sanitizeVersion removes any leading "v" from the version string
+func sanitizeVersion(version string) string {
+	return strings.TrimPrefix(version, "v")
+}