Add ability to scan snaps (as a source) (#3929)

syft/format/internal/spdxutil/helpers/document_name_test.go

@@ -45,6 +45,15 @@ func Test_DocumentName(t *testing.T) {
 			},
 			expected: "some/path/to/place",
 		},
+		{
+			name: "snap",
+			srcMetadata: source.Description{
+				Name: "some/name",
+				// there is nothing in the snap metadata that indicates a name
+				Metadata: source.SnapMetadata{},
+			},
+			expected: "some/name",
+		},
 		{
 			name: "named",
 			srcMetadata: source.Description{

syft/format/internal/spdxutil/helpers/document_namespace.go

@@ -16,6 +16,7 @@ const (
 	InputImage     = "image"
 	InputDirectory = "dir"
 	InputFile      = "file"
+	InputSnap      = "snap"
 )
 
 func DocumentNameAndNamespace(src source.Description, desc sbom.Descriptor) (string, string) {
@@ -33,6 +34,8 @@ func DocumentNamespace(name string, src source.Description, desc sbom.Descriptor
 		input = InputDirectory
 	case source.FileMetadata:
 		input = InputFile
+	case source.SnapMetadata:
+		input = InputSnap
 	}
 
 	uniqueID := uuid.Must(uuid.NewRandom())

syft/format/internal/spdxutil/helpers/document_namespace_test.go

@@ -12,7 +12,7 @@ import (
 	"github.com/anchore/syft/syft/source"
 )
 
-func Test_documentNamespace(t *testing.T) {
+func Test_DocumentNamespace(t *testing.T) {
 	tracker := sourcemetadata.NewCompletionTester(t)
 
 	tests := []struct {
@@ -53,6 +53,14 @@ func Test_documentNamespace(t *testing.T) {
 			},
 			expected: "https://anchore.com/syft/file/my-name-",
 		},
+		{
+			name:      "snap",
+			inputName: "my-name",
+			src: source.Description{
+				Metadata: source.SnapMetadata{},
+			},
+			expected: "https://anchore.com/syft/snap/my-name-",
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {