chore: trace log pom property reflect usage (#2059)

This reflect code occasionally throws an obscure panic, but not enough
information is logged before the panic to know why it panicked. Log
enough to tell what property and package are being analyzed when the
panic occurs.

Signed-off-by: Will Murphy <will.murphy@anchore.com>

syft/pkg/cataloger/java/parse_pom_xml.go

@@ -13,6 +13,7 @@ import (
 	"github.com/vifraa/gopom"
 	"golang.org/x/net/html/charset"
 
+	"github.com/anchore/syft/internal/log"
 	"github.com/anchore/syft/syft/artifact"
 	"github.com/anchore/syft/syft/file"
 	"github.com/anchore/syft/syft/pkg"
@@ -60,12 +61,13 @@ func newPomProject(path string, p gopom.Project) *pkg.PomProject {
 	artifactID := safeString(p.ArtifactID)
 	name := safeString(p.Name)
 	projectURL := safeString(p.URL)
+	log.WithFields("path", path, "artifactID", artifactID, "name", name, "projectURL", projectURL).Trace("parsing pom.xml")
 	return &pkg.PomProject{
 		Path:        path,
 		Parent:      pomParent(p, p.Parent),
-		GroupID:     resolveProperty(p, p.GroupID),
+		GroupID:     resolveProperty(p, p.GroupID, "groupId"),
 		ArtifactID:  artifactID,
-		Version:     resolveProperty(p, p.Version),
+		Version:     resolveProperty(p, p.Version, "version"),
 		Name:        name,
 		Description: cleanDescription(p.Description),
 		URL:         projectURL,
@@ -75,14 +77,14 @@ func newPomProject(path string, p gopom.Project) *pkg.PomProject {
 func newPackageFromPom(pom gopom.Project, dep gopom.Dependency, locations ...file.Location) pkg.Package {
 	m := pkg.JavaMetadata{
 		PomProperties: &pkg.PomProperties{
-			GroupID:    resolveProperty(pom, dep.GroupID),
-			ArtifactID: resolveProperty(pom, dep.ArtifactID),
-			Scope:      resolveProperty(pom, dep.Scope),
+			GroupID:    resolveProperty(pom, dep.GroupID, "groupId"),
+			ArtifactID: resolveProperty(pom, dep.ArtifactID, "artifactId"),
+			Scope:      resolveProperty(pom, dep.Scope, "scope"),
 		},
 	}
 
 	name := safeString(dep.ArtifactID)
-	version := resolveProperty(pom, dep.Version)
+	version := resolveProperty(pom, dep.Version, "version")
 
 	p := pkg.Package{
 		Name:         name,
@@ -151,9 +153,9 @@ func pomParent(pom gopom.Project, parent *gopom.Parent) (result *pkg.PomParent)
 
 	artifactID := safeString(parent.ArtifactID)
 	result = &pkg.PomParent{
-		GroupID:    resolveProperty(pom, parent.GroupID),
+		GroupID:    resolveProperty(pom, parent.GroupID, "groupId"),
 		ArtifactID: artifactID,
-		Version:    resolveProperty(pom, parent.Version),
+		Version:    resolveProperty(pom, parent.Version, "version"),
 	}
 
 	if result.GroupID == "" && result.ArtifactID == "" && result.Version == "" {
@@ -182,8 +184,9 @@ func cleanDescription(original *string) (cleaned string) {
 // If no match is found, the entire expression including ${} is returned
 //
 //nolint:gocognit
-func resolveProperty(pom gopom.Project, property *string) string {
+func resolveProperty(pom gopom.Project, property *string, propertyName string) string {
 	propertyCase := safeString(property)
+	log.WithFields("existingPropertyValue", propertyCase, "propertyName", propertyName).Trace("resolving property")
 	return propertyMatcher.ReplaceAllStringFunc(propertyCase, func(match string) string {
 		propertyName := strings.TrimSpace(match[2 : len(match)-1])
 		entries := pomProperties(pom)

syft/pkg/cataloger/java/parse_pom_xml_test.go

@@ -450,7 +450,7 @@ func Test_resolveProperty(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			resolved := resolveProperty(test.pom, stringPointer(test.property))
+			resolved := resolveProperty(test.pom, stringPointer(test.property), test.name)
 			assert.Equal(t, test.expected, resolved)
 		})
 	}