Check conflicts script

Use pkg_resources.require to report conflicts to ensure
co-installability.

Co-Authored-By: Igor Yozhikov <iyozhikov@mirantis.com>
Change-Id: I7443496b6a06d02bb9cc9457b729dea71451f44a

openstack_requirements/cmds/check_conflicts.py

@@ -0,0 +1,58 @@
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+"""Apply validation rules to the various requirements lists.
+
+"""
+
+import argparse
+import sys
+import traceback
+
+import pkg_resources
+
+from openstack_requirements import requirement
+
+
+def read_requirements_file(filename):
+    with open(filename, 'rt') as f:
+        body = f.read()
+    return requirement.parse(body)
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        'upper_constraints',
+        default='upper-constraints.txt',
+        help='path to the upper-constraints.txt file',
+    )
+    args = parser.parse_args()
+
+    error_count = 0
+
+    print('\nChecking %s' % args.upper_constraints)
+    upper_constraints = read_requirements_file(args.upper_constraints)
+    for name, spec_list in upper_constraints.items():
+        try:
+            if name:
+                print('Checking conflicts for %s' % name)
+                pyver = "python_version=='%s.%s'" % (sys.version_info[0],
+                                                     sys.version_info[1])
+                for req, original_line in spec_list:
+                    if req.markers in ["", pyver]:
+                        pkg_resources.require(name)
+        except pkg_resources.ContextualVersionConflict:
+            traceback.print_exc(file=sys.stdout)
+            error_count += 1
+
+    return 1 if error_count else 0

setup.cfg

@@ -32,6 +32,7 @@ source-dir = doc/source
 console_scripts =
     edit-constraints = openstack_requirements.cmds.edit_constraint:main
     generate-constraints = openstack_requirements.cmds.generate:main
+    check-conflicts = openstack_requirements.cmds.check_conflicts:main
     update-requirements = openstack_requirements.cmds.update:main
     validate-constraints = openstack_requirements.cmds.validate:main
     validate-projects = openstack_requirements.cmds.validate_projects:main

tox.ini

@@ -13,6 +13,7 @@ commands =
 
 [testenv:py27-with-upper-constraints]
 deps = -r{toxinidir}/upper-constraints.txt
+commands = check-conflicts {toxinidir}/upper-constraints.txt
 
 [testenv:venv]
 commands = {posargs}