[environments] Add helper function to list environment packages

This assumes that the environment are setup using conda.

beat/core/environments.py

+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+
+###############################################################################
+#                                                                             #
+# Copyright (c) 2018 Idiap Research Institute, http://www.idiap.ch/           #
+# Contact: beat.support@idiap.ch                                              #
+#                                                                             #
+# This file is part of the beat.core module of the BEAT platform.             #
+#                                                                             #
+# Commercial License Usage                                                    #
+# Licensees holding valid commercial BEAT licenses may use this file in       #
+# accordance with the terms contained in a written agreement between you      #
+# and Idiap. For further information contact tto@idiap.ch                     #
+#                                                                             #
+# Alternatively, this file may be used under the terms of the GNU Affero      #
+# Public License version 3 as published by the Free Software and appearing    #
+# in the file LICENSE.AGPL included in the packaging of this file.            #
+# The BEAT platform is distributed in the hope that it will be useful, but    #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
+# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
+#                                                                             #
+# You should have received a copy of the GNU Affero Public License along      #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
+#                                                                             #
+###############################################################################
+
+"""
+Helper functions related to environment management
+"""
+
+import re
+import logging
+
+
+logger = logging.getLogger(__name__)
+
+
+def enumerate_packages(host, environment_name):
+    """
+    Enumerate the packages installed in given environment.
+    """
+
+    packages = []
+
+    if environment_name not in host.processing_environments:
+        logger.error('Environment "{}" not found'.format(environment_name))
+        return packages
+
+    cmd = ["conda", "list"]
+    container = host.create_container(environment_name, cmd)
+
+    try:
+        host.start(container)
+    except RuntimeError:
+        logger.exception("Failed to list packages")
+        return packages
+
+    status = host.wait(container)
+    if status != 0:
+        logger.error('Command error: {}'.format(status))
+        return packages
+
+    output = host.logs(container)
+
+    package_lines = output.split("\n")
+
+    for package_line in package_lines:
+        information = re.split('\s+', package_line)
+        if len(information) == 4:
+            packages.append({
+                'name': information[0],
+                'version': information[1]
+            })
+
+    return packages

beat/core/test/test_environments.py

+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+
+###############################################################################
+#                                                                             #
+# Copyright (c) 2018 Idiap Research Institute, http://www.idiap.ch/           #
+# Contact: beat.support@idiap.ch                                              #
+#                                                                             #
+# This file is part of the beat.core module of the BEAT platform.             #
+#                                                                             #
+# Commercial License Usage                                                    #
+# Licensees holding valid commercial BEAT licenses may use this file in       #
+# accordance with the terms contained in a written agreement between you      #
+# and Idiap. For further information contact tto@idiap.ch                     #
+#                                                                             #
+# Alternatively, this file may be used under the terms of the GNU Affero      #
+# Public License version 3 as published by the Free Software and appearing    #
+# in the file LICENSE.AGPL included in the packaging of this file.            #
+# The BEAT platform is distributed in the hope that it will be useful, but    #
+# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  #
+# or FITNESS FOR A PARTICULAR PURPOSE.                                        #
+#                                                                             #
+# You should have received a copy of the GNU Affero Public License along      #
+# with the BEAT platform. If not, see http://www.gnu.org/licenses/.           #
+#                                                                             #
+###############################################################################
+
+import unittest
+
+from ..dock import Host
+
+from .. import environments
+
+from .utils import slow
+
+
+class EnvironmentTest(unittest.TestCase):
+
+    def setUp(self):
+        self.host = Host(raise_on_errors=False)
+        self.test_environment = \
+            self.host.full_environment_name('Cxx development environment')
+
+    def tearDown(self):
+        self.host.teardown()
+        assert not self.host.containers  # All containers are gone
+
+    @slow
+    def test_package_enumeration(self):
+        package_list = environments.enumerate_packages(self.host,
+                                                       self.test_environment)
+
+        self.assertTrue(len(package_list) > 0)
+
+        for package in package_list:
+            self.assertListEqual(package.keys(), ['version', 'name'])