Determine cyclonedx major version without importlib

extensions/commands/recipe/cmd_create_sbom.py

@@ -1,4 +1,3 @@
-from importlib.metadata import version
 import os.path
 import sys
 from typing import TYPE_CHECKING, Any, Iterable, List, Optional, Set, Tuple, Union, Dict
@@ -12,10 +11,6 @@
     from cyclonedx.model.bom import Bom
 
 
-def cyclonedx_major_version_is_4() -> int:
-    return version('cyclonedx-python-lib')[0] == '4'
-
-
 def format_text(output: Dict[str, Any]) -> None:
     serialized = output['formatters'][output['sbom_format']](output['bom']).output_as_string()
     cli_out_write(serialized)
@@ -50,6 +45,13 @@ def create_sbom(conan_api: ConanAPI, parser, *args) -> Dict[str, Any]:
     def package_type_to_component_type(pt: str) -> ComponentType:
         return ComponentType.APPLICATION if pt == "application" else ComponentType.LIBRARY
 
+    def cyclonedx_major_version_is_4() -> bool:
+        try:
+            LicenseChoice(license=LicenseFactory().make_from_string("MIT"))
+            return True
+        except TypeError:  # argument in version 3 is named license_
+            return False
+
     def licenses(ls: Optional[Union[Tuple[str, ...], Set[str], List[str], str]]) -> Optional[Iterable[LicenseChoice]]:
         """
         see https://cyclonedx.org/docs/1.4/json/#components_items_licenses

tests/test_create_sbom.py

@@ -1,4 +1,3 @@
-import importlib.metadata
 import json
 import xml.dom.minidom
 import os
@@ -13,10 +12,6 @@
 REQ_DEP = "m4"
 
 
-def cyclonedx_major_version_is_4() -> int:
-    return importlib.metadata.version('cyclonedx-python-lib')[0] == '4'
-
-
 @pytest.fixture(autouse=True)
 def conan_test():
     old_env = dict(os.environ)
@@ -48,6 +43,15 @@ def _test_generated_sbom_json(sbom, test_metadata_name, spec_version):
 
 
 def _test_generated_sbom_xml(sbom, test_metadata_name, spec_version):
+    def cyclonedx_major_version_is_4() -> bool:
+        try:
+            from cyclonedx.factory.license import LicenseFactory
+            from cyclonedx.model import LicenseChoice
+            LicenseChoice(license=LicenseFactory().make_from_string("MIT"))
+            return True
+        except TypeError:  # argument in version 3 is named license_
+            return False
+
     def with_ns(key: str) -> str:
         ns = "ns0:" if cyclonedx_major_version_is_4() else ""
         return ns + key