feat: report unknowns in sbom (#2998)

Signed-off-by: Keith Zantow <kzantow@gmail.com>
Signed-off-by: Alex Goodman <wagoodman@users.noreply.github.com>
Co-authored-by: Alex Goodman <wagoodman@users.noreply.github.com>

syft/pkg/cataloger/lua/parse_rockspec.go

@@ -2,6 +2,7 @@ package lua
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
 	"github.com/anchore/syft/internal/log"
@@ -30,7 +31,7 @@ func parseRockspec(_ context.Context, _ file.Resolver, _ *generic.Environment, r
 	doc, err := parseRockspecData(reader)
 	if err != nil {
 		log.WithFields("error", err).Trace("unable to parse Rockspec app")
-		return nil, nil, nil
+		return nil, nil, fmt.Errorf("unable to parse Rockspec app: %w", err)
 	}
 
 	var name, version, license, homepage, description, url string

syft/pkg/cataloger/lua/parse_rockspec_test.go

@@ -106,3 +106,10 @@ func TestParseRockspec(t *testing.T) {
 		})
 	}
 }
+
+func Test_corruptRockspec(t *testing.T) {
+	pkgtest.NewCatalogTester().
+		FromFile(t, "test-fixtures/corrupt/bad-1.23.0-0.rockspec").
+		WithError().
+		TestParser(t, parseRockspec)
+}

syft/pkg/cataloger/lua/test-fixtures/corrupt/bad-1.23.0-0.rockspec

@@ -0,0 +1,5 @@
+package = {"kon
+
+3.7.0-0"
+rockspec_fo}
+}