Cloudscale volume (#49887)

* Cloudscale integration test setup

CloudProvider and CloudEnvironment classes for Cloudscale integration
tests. This also contains a cloudscale_common role with common
variables for all tests.

* cloudscale_volume module

New cloud module to manage volumes on the cloudscale.ch IaaS service.

test/runner/lib/cloud/cloudscale.py

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+#
+# (c) 2018, Gaudenz Steinlin <gaudenz.steinlin@cloudscale.ch>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+"""Cloudscale plugin for integration tests."""
+from __future__ import absolute_import, print_function
+
+from os.path import isfile
+
+from lib.cloud import (
+    CloudProvider,
+    CloudEnvironment,
+)
+
+from lib.util import ConfigParser, display
+
+
+class CloudscaleCloudProvider(CloudProvider):
+    """Cloudscale cloud provider plugin. Sets up cloud resources before
+       delegation.
+    """
+
+    def __init__(self, args):
+        """
+        :type args: TestConfig
+        """
+        super(CloudscaleCloudProvider, self).__init__(args, config_extension='.ini')
+
+    def filter(self, targets, exclude):
+        """Filter out the cloud tests when the necessary config and resources are not available.
+        :type targets: tuple[TestTarget]
+        :type exclude: list[str]
+        """
+        if isfile(self.config_static_path):
+            return
+
+        super(CloudscaleCloudProvider, self).filter(targets, exclude)
+
+    def setup(self):
+        super(CloudscaleCloudProvider, self).setup()
+
+        if isfile(self.config_static_path):
+            display.info('Using existing %s cloud config: %s'
+                         % (self.platform, self.config_static_path),
+                         verbosity=1)
+            self.config_path = self.config_static_path
+            self.managed = False
+            return True
+
+        return False
+
+
+class CloudscaleCloudEnvironment(CloudEnvironment):
+    """Cloudscale cloud environment plugin. Updates integration test environment
+       after delegation.
+    """
+    def configure_environment(self, env, cmd):
+        """
+        :type env: dict[str, str]
+        :type cmd: list[str]
+        """
+        parser = ConfigParser()
+        parser.read(self.config_path)
+
+        changes = dict(
+            CLOUDSCALE_API_TOKEN=parser.get('default', 'cloudscale_api_token'),
+        )
+
+        env.update(changes)
+
+        cmd.append('-e')
+        cmd.append('cloudscale_resource_prefix=%s' % self.resource_prefix)