Add the Ocaml ecosystem (#3112)

Signed-off-by: Laurent Goderre <laurent.goderre@docker.com>

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

@@ -26,6 +26,8 @@ func DownloadLocation(p pkg.Package) string {
 			return NoneIfEmpty(metadata.Dist.URL)
 		case pkg.PhpComposerInstalledEntry:
 			return NoneIfEmpty(metadata.Dist.URL)
+		case pkg.OpamPackage:
+			return NoneIfEmpty(metadata.URL)
 		}
 	}
 	return NOASSERTION

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

@@ -41,6 +41,7 @@ func Test_OriginatorSupplier(t *testing.T) {
 		pkg.RustCargoLockEntry{},
 		pkg.SwiftPackageManagerResolvedEntry{},
 		pkg.SwiplPackEntry{},
+		pkg.OpamPackage{},
 		pkg.YarnLockEntry{},
 	)
 	tests := []struct {
@@ -350,6 +351,14 @@ func Test_OriginatorSupplier(t *testing.T) {
 			originator: "Person: auth (auth@auth.gov)",
 			supplier:   "Person: me (me@auth.com)",
 		},
+		{
+			name: "from ocaml opam",
+			input: pkg.Package{
+				Metadata: pkg.OpamPackage{},
+			},
+			originator: "",
+			supplier:   "",
+		},
 	}
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {

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

@@ -64,6 +64,8 @@ func SourceInfo(p pkg.Package) string {
 		answer = "acquired package info from resolved Swift package manifest"
 	case pkg.SwiplPackPkg:
 		answer = "acquired package info from SWI Prolo pack package file"
+	case pkg.OpamPkg:
+		answer = "acquired package info from OCaml opam package file"
 	case pkg.GithubActionPkg, pkg.GithubActionWorkflowPkg:
 		answer = "acquired package info from GitHub Actions workflow file or composite action file"
 	case pkg.WordpressPluginPkg:

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

@@ -271,6 +271,14 @@ func Test_SourceInfo(t *testing.T) {
 				"acquired package info from SWI Prolo pack package file",
 			},
 		},
+		{
+			input: pkg.Package{
+				Type: pkg.OpamPkg,
+			},
+			expected: []string{
+				"acquired package info from OCaml opam package file",
+			},
+		},
 		{
 			input: pkg.Package{
 				Type: pkg.GithubActionPkg,