Add a versioning helper module

lib/ansible/galaxy/dependency_resolution/__init__.py

@@ -0,0 +1,7 @@
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2020, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+"""Dependency resolution machinery."""
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type

lib/ansible/galaxy/dependency_resolution/versioning.py

@@ -0,0 +1,67 @@
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2019-2020, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+"""Version comparison helpers."""
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import operator
+from distutils.version import LooseVersion
+
+from ansible.utils.version import SemanticVersion
+
+
+def is_pre_release(version):
+    # type: (str) -> bool
+    """Figure out if a given version is a pre-release."""
+    return SemanticVersion(version).is_prerelease
+
+
+def meets_requirements(version, requirements):
+    # type: (str, str) -> bool
+    """Verify if a given version satisfies all the requirements.
+
+    Supported version identifiers are:
+      * '=='
+      * '!='
+      * '>'
+      * '>='
+      * '<'
+      * '<='
+      * '*'
+
+    Each requirement is delimited by ','.
+    """
+    op_map = {
+        '!=': operator.ne,
+        '==': operator.eq,
+        '=': operator.eq,
+        '>=': operator.ge,
+        '>': operator.gt,
+        '<=': operator.le,
+        '<': operator.lt,
+    }
+
+    for req in requirements.split(','):
+        op_pos = 2 if len(req) > 1 and req[1] == '=' else 1
+        op = op_map.get(req[:op_pos])
+
+        requirement = req[op_pos:]
+        if not op:
+            requirement = req
+            op = operator.eq
+
+        if requirement == '*' or version == '*':
+            continue
+
+        if not op(
+                SemanticVersion(version),
+                SemanticVersion.from_loose_version(LooseVersion(requirement)),
+        ):
+            break
+    else:
+        return True
+
+    # The loop was broken early, it does not meet all the requirements
+    return False