use packit SBOM logging + add debug logger

build.go

@@ -107,7 +107,7 @@ func Build(
 		logger.Action("Completed in %s", duration.Round(time.Millisecond))
 		logger.Break()
 
-		logger.Process("Generating SBOM for directory %s", yarnLayer.Path)
+		logger.GeneratingSBOM(yarnLayer.Path)
 		var sbomContent sbom.SBOM
 		duration, err = clock.Measure(func() error {
 			sbomContent, err = sbomGenerator.GenerateFromDependency(dependency, context.WorkingDir)
@@ -120,6 +120,7 @@ func Build(
 		logger.Action("Completed in %s", duration.Round(time.Millisecond))
 		logger.Break()
 
+		logger.FormattingSBOM(context.BuildpackInfo.SBOMFormats...)
 		yarnLayer.SBOM, err = sbomContent.InFormats(context.BuildpackInfo.SBOMFormats...)
 		if err != nil {
 			return packit.BuildResult{}, err

integration/default_test.go

@@ -71,6 +71,7 @@ func testDefault(t *testing.T, context spec.G, it spec.S) {
 				WithPullPolicy("never").
 				WithBuildpacks(buildpack, buildPlanBuildpack).
 				WithSBOMOutputDir(sbomDir).
+				WithEnv(map[string]string{"BP_LOG_LEVEL": "DEBUG"}).
 				Execute(name, source)
 			Expect(err).ToNot(HaveOccurred(), logs.String)
 
@@ -90,6 +91,15 @@ func testDefault(t *testing.T, context spec.G, it spec.S) {
 				"  Executing build process",
 				MatchRegexp(`    Installing Yarn`),
 				MatchRegexp(`      Completed in ([0-9]*(\.[0-9]*)?[a-z]+)+`),
+				"",
+				fmt.Sprintf("  Generating SBOM for directory /layers/%s/yarn", strings.ReplaceAll(buildpackInfo.Buildpack.ID, "/", "_")),
+				MatchRegexp(`      Completed in \d+(\.?\d+)*`),
+				"",
+				"  Writing SBOM in the following format(s):",
+				"    application/vnd.cyclonedx+json",
+				"    application/spdx+json",
+				"    application/vnd.syft+json",
+				"",
 			))
 
 			// check that all required SBOM files are present

run/main.go

@@ -22,7 +22,7 @@ func (f Generator) GenerateFromDependency(dependency postal.Dependency, path str
 func main() {
 	entryResolver := draft.NewPlanner()
 	dependencyManager := postal.NewService(cargo.NewTransport())
-	logEmitter := scribe.NewEmitter(os.Stdout)
+	logEmitter := scribe.NewEmitter(os.Stdout).WithLevel(os.Getenv("BP_LOG_LEVEL"))
 
 	packit.Run(
 		yarn.Detect(),