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# Copyright 2014-2015 Canonical Limited.
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from charmhelpers.fetch import apt_install, apt_update
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from charmhelpers.core.hookenv import charm_dir, log
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__author__ = "Jorge Niedbalski <jorge.niedbalski@canonical.com>"
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def pip_execute(*args, **kwargs):
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"""Overriden pip_execute() to stop sys.path being changed.
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The act of importing main from the pip module seems to cause add wheels
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from the /usr/share/python-wheels which are installed by various tools.
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This function ensures that sys.path remains the same after the call is
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from pip import main as _pip_execute
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apt_install('python-pip')
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apt_install('python3-pip')
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from pip import main as _pip_execute
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_pip_execute(*args, **kwargs)
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def parse_options(given, available):
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"""Given a set of options, check if available"""
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for key, value in sorted(given.items()):
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yield "--{0}={1}".format(key, value)
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def pip_install_requirements(requirements, constraints=None, **options):
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"""Install a requirements file.
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:param constraints: Path to pip constraints file.
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http://pip.readthedocs.org/en/stable/user_guide/#constraints-files
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available_options = ('proxy', 'src', 'log', )
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for option in parse_options(options, available_options):
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command.append(option)
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command.append("-r {0}".format(requirements))
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command.append("-c {0}".format(constraints))
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log("Installing from file: {} with constraints {} "
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"and options: {}".format(requirements, constraints, command))
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log("Installing from file: {} with options: {}".format(requirements,
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def pip_install(package, fatal=False, upgrade=False, venv=None,
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constraints=None, **options):
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"""Install a python package"""
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venv_python = os.path.join(venv, 'bin/pip')
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command = [venv_python, "install"]
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available_options = ('proxy', 'src', 'log', 'index-url', )
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for option in parse_options(options, available_options):
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command.append(option)
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command.append('--upgrade')
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command.extend(['-c', constraints])
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if isinstance(package, list):
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command.extend(package)
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command.append(package)
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log("Installing {} package with options: {}".format(package,
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subprocess.check_call(command)
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def pip_uninstall(package, **options):
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"""Uninstall a python package"""
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command = ["uninstall", "-q", "-y"]
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available_options = ('proxy', 'log', )
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for option in parse_options(options, available_options):
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command.append(option)
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if isinstance(package, list):
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command.extend(package)
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command.append(package)
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log("Uninstalling {} package with options: {}".format(package,
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"""Returns the list of current python installed packages
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return pip_execute(["list"])
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def pip_create_virtualenv(path=None):
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"""Create an isolated Python environment."""
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apt_install('python-virtualenv')
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apt_install('python3-virtualenv')
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venv_path = os.path.join(charm_dir(), 'venv')
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if not os.path.exists(venv_path):
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subprocess.check_call(['virtualenv', venv_path])
added
removed
lib/charmhelpers/fetch/python/packages.py
