Move optional build dependencies to 'extras'

...and start skipping the relevant tests in 'nova.tests.unit.virt' if
these dependencies are not present. Thanks to hacking rules N311 and
N312, which prevent virt drivers using code from other virt drivers,
simply skipping the unit tests for a virt driver module is enough to
ensure we never load those modules.

This means users that want to use the powervm driver can install the
required dependencies using e.g. 'pip install .[powervm]', and packagers
can choose to skip packaging a dependency safe in the knowledge that the
relevant tests will be skipped.

Change-Id: I3787f9afd78cd0a7c7feb4dfe1bcb21437b5a128
Signed-off-by: Stephen Finucane <stephenfin@redhat.com>

nova/tests/unit/virt/hyperv/__init__.py

@@ -0,0 +1,20 @@
+# 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.
+
+import unittest
+
+try:
+    import os_win  # noqa: F401
+except ImportError:
+    raise unittest.SkipTest(
+        "The 'os-win' dependency is not installed."
+    )

nova/tests/unit/virt/powervm/__init__.py

@@ -11,13 +11,22 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
-#
+
+import unittest
+
 from oslo_utils.fixture import uuidsentinel
 
 from nova.compute import power_state
 from nova.compute import vm_states
 from nova import objects
 
+try:
+    import powervm  # noqa: F401
+except ImportError:
+    raise unittest.SkipTest(
+        "The 'pypowervm' dependency is not installed."
+    )
+
 
 TEST_FLAVOR = objects.flavor.Flavor(
     memory_mb=2048,

nova/tests/unit/virt/vmwareapi/__init__.py

@@ -0,0 +1,20 @@
+# 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.
+
+import unittest
+
+try:
+    import oslo_vmware  # noqa: F401
+except ImportError:
+    raise unittest.SkipTest(
+        "The 'oslo.vmware' dependency is not installed."
+    )

nova/tests/unit/virt/zvm/__init__.py

@@ -0,0 +1,20 @@
+# 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.
+
+import unittest
+
+try:
+    import zvmconnector  # noqa: F401
+except ImportError:
+    raise unittest.SkipTest(
+        "The 'zVMCloudConnector' dependency is not installed."
+    )

requirements.txt

@@ -8,8 +8,6 @@ lxml>=4.5.0 # BSD
 Routes>=2.3.1 # MIT
 cryptography>=2.7 # BSD/Apache-2.0
 WebOb>=1.8.2 # MIT
-# NOTE(mriedem): greenlet 0.4.14 does not work with older versions of gcc on
-# ppc64le systems, see https://github.com/python-greenlet/greenlet/issues/136.
 greenlet>=0.4.15 # MIT
 PasteDeploy>=1.5.0 # MIT
 Paste>=2.0.2 # MIT
@@ -52,17 +50,14 @@ os-brick>=4.3.1 # Apache-2.0
 os-resource-classes>=1.1.0 # Apache-2.0
 os-traits>=2.5.0 # Apache-2.0
 os-vif>=1.15.2 # Apache-2.0
-os-win>=5.4.0 # Apache-2.0
 castellan>=0.16.0 # Apache-2.0
 microversion-parse>=0.2.1 # Apache-2.0
 tooz>=1.58.0 # Apache-2.0
 cursive>=0.2.1 # Apache-2.0
-pypowervm>=1.1.15 # Apache-2.0
 retrying>=1.3.3,!=1.3.0 # Apache-2.0
 os-service-types>=1.7.0 # Apache-2.0
 taskflow>=3.8.0 # Apache-2.0
 python-dateutil>=2.7.0 # BSD
-zVMCloudConnector>=1.3.0;sys_platform!='win32'  # Apache 2.0 License
 futurist>=1.8.0 # Apache-2.0
 openstacksdk>=0.35.0 # Apache-2.0
 dataclasses>=0.7;python_version=='3.6'  # Apache 2.0 License

setup.cfg

@@ -30,6 +30,14 @@ classifiers =
 [extras]
 osprofiler =
     osprofiler>=1.4.0 # Apache-2.0
+powervm =
+    pypowervm>=1.1.15 # Apache-2.0
+zvm =
+    zVMCloudConnector>=1.3.0;sys_platform!='win32'  # Apache 2.0 License
+hyperv =
+    os-win>=5.4.0 # Apache-2.0
+vmware =
+    oslo.vmware>=3.6.0 # Apache-2.0
 
 [files]
 data_files =

test-requirements.txt

@@ -23,6 +23,3 @@ testtools>=2.5.0 # MIT
 bandit>=1.1.0 # Apache-2.0
 gabbi>=1.35.0 # Apache-2.0
 wsgi-intercept>=1.7.0 # MIT License
-
-# vmwareapi driver specific dependencies
-oslo.vmware>=3.6.0 # Apache-2.0