604926b38f
An element can define a list of elements provided by itself. This allows using an alternative element and keeping element dependencies at the same time. This will be needed for example for mariadb element which will be an alternative to mysql element - mysql dependency can be kept everywhere but user can choose mariadb explicitly as a replacement by putting "mysql" into "element-provides" file. Change-Id: I7f193612f279dd71d9f1f1edfc60009838a00c5a
113 lines
4.5 KiB
Python
113 lines
4.5 KiB
Python
# Copyright 2013 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import fixtures
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import testtools
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from diskimage_builder import element_dependencies
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data_dir = os.path.abspath(
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os.path.join(os.path.dirname(__file__), 'test-elements'))
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def _populate_element(element_dir, element_name, element_deps=[], provides=[]):
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element_home = os.path.join(element_dir, element_name)
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os.mkdir(element_home)
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deps_path = os.path.join(element_home, 'element-deps')
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with open(deps_path, 'w') as deps_file:
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deps_file.write("\n".join(element_deps))
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provides_path = os.path.join(element_home, 'element-provides')
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with open(provides_path, 'w') as provides_file:
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provides_file.write("\n".join(provides))
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class TestElementDeps(testtools.TestCase):
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def setUp(self):
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super(TestElementDeps, self).setUp()
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self.element_dir = self.useFixture(fixtures.TempDir()).path
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_populate_element(self.element_dir, 'requires-foo', ['foo'])
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_populate_element(self.element_dir, 'foo')
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_populate_element(self.element_dir,
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'requires-requires-foo',
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['requires-foo'])
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_populate_element(self.element_dir, 'self', ['self'])
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_populate_element(self.element_dir,
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'provides_virtual',
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[],
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['virtual'])
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_populate_element(self.element_dir, 'requires_virtual', ['virtual'])
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_populate_element(self.element_dir, 'virtual', [])
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_populate_element(self.element_dir, 'circular1', ['circular2'])
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_populate_element(self.element_dir, 'circular2', ['circular1'])
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def test_non_transitive_deps(self):
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result = element_dependencies.expand_dependencies(
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['requires-foo'],
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elements_dir=self.element_dir)
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self.assertEqual(set(['requires-foo', 'foo']), result)
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def test_missing_deps(self):
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self.assertRaises(SystemExit,
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element_dependencies.expand_dependencies, ['fake'],
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self.element_dir)
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def test_transitive_deps(self):
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result = element_dependencies.expand_dependencies(
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['requires-requires-foo'], elements_dir=self.element_dir)
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self.assertEqual(set(['requires-requires-foo',
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'requires-foo',
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'foo']), result)
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def test_no_deps(self):
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result = element_dependencies.expand_dependencies(
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['foo'], elements_dir=self.element_dir)
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self.assertEqual(set(['foo']), result)
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def test_self(self):
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result = element_dependencies.expand_dependencies(
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['self'], elements_dir=self.element_dir)
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self.assertEqual(set(['self']), result)
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def test_circular(self):
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result = element_dependencies.expand_dependencies(
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['circular1'], elements_dir=self.element_dir)
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self.assertEqual(set(['circular1', 'circular2']), result)
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def test_provide(self):
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result = element_dependencies.expand_dependencies(
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['requires_virtual', 'provides_virtual'],
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elements_dir=self.element_dir)
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self.assertEqual(set(['requires_virtual', 'provides_virtual']), result)
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def test_provide_conflict(self):
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self.assertRaises(SystemExit,
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element_dependencies.expand_dependencies,
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['virtual', 'provides_virtual'],
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self.element_dir)
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class TestElements(testtools.TestCase):
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def test_depends_on_env(self):
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self.useFixture(
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fixtures.EnvironmentVariable('ELEMENTS_PATH', '/foo/bar'))
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self.assertEqual('/foo/bar', element_dependencies.get_elements_dir())
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def test_env_not_set(self):
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self.useFixture(fixtures.EnvironmentVariable('ELEMENTS_PATH', ''))
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self.assertRaises(Exception, element_dependencies.get_elements_dir, ())
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